Article(id=1307086107716383481, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, articleNumber=null, orderNo=null, doi=10.12401/j.nwg.2025041, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1713974400000, receivedDateStr=2024-04-25, revisedDate=1769097600000, revisedDateStr=2026-01-23, acceptedDate=1742486400000, acceptedDateStr=2025-03-21, onlineDate=1789563212564, onlineDateStr=2026-09-16, pubDate=1787155200000, pubDateStr=2026-08-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789563212564, onlineIssueDateStr=2026-09-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789563212564, creator=13701087609, updateTime=1789563212564, updator=13701087609, issue=Issue{id=1307086088166732376, tenantId=1146029695717560320, journalId=1306274195778404443, year='2026', volume='59', issue='4', pageStart='1', pageEnd='386', issueExtLink='null', onlineDate='null', pubDate='1787155200000', pubDateStr='2026-08-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1789563207904, creator='13701087609', updateTime=1789616196824, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1307308339885531645, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1307308339885531646, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=270, endPage=284, ext={EN=ArticleExt(id=1307086107930292986, articleId=1307086107716383481, tenantId=1146029695717560320, journalId=1306274195778404443, language=EN, title=Early Cambrian Intra-Oceanic Subduction of the Paleo-Shangdan Ocean: New Evidences from the Oceanic Plagiogranite in the Guanzi Town Ophiolite Melange, columnId=null, journalTitle=Northwestern Geology, columnName=null, runingTitle=null, highlight=null, articleAbstract=

A series of quartz granodiorite-granodiorite rock assemblage has been identified in Heiwan area of the Guanzi Town ophiolite mélange. In order to determine the formation mechanism of them, the petrology and whole rock geochemistry of gneissic granodiorite and metamorphic tonalite were conducted, and the zircon U-Pb dating, Lu-Hf isotope, Rb-Sr and Sm-Nd isotope of gneissic granodiorite were conducted. The results show that gneissic granodiorite and metamorphic tonalite have low contents of rare earth and trace elements, and metamorphic tonalite has obvious Eu positive anomaly, and both of them have the characteristics of oceanic plagiogranite. The age of granodiorite obtained is 512.6±2.0 Ma, and the εHf(t) value varies from +8.9 to +13.8, indicating that its magma source area is depleted mantle. The ISr value of granodiorite ranges from 0.7046 to 0.7053, and the εNd(t) value ranges from +2.55 to +3.08. Combined with the regional tectonic evolution, this set of ocean plagiogranite was formed by the emplacement of acidic magma formed by partial melting of basaltic rocks in the mantle at low temperature (602.9~707.4 ℃) and low pressure (< 0.2 GPa), and was formed in the island arc environment related to the subduction of Shangdan Ocean in the early Middle Cambrian.

, authors=Jixiu WU1, Yanwei YUAN2, Guangdong LI3, Xiaosai WANG1, Zhiwei BI3, authorsList=Jixiu WU, Yanwei YUAN, Guangdong LI, Xiaosai WANG, Zhiwei BI, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Northwestern Geology. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1307086110576898833, articleId=1307086107716383481, tenantId=1146029695717560320, journalId=1306274195778404443, language=CN, title=商丹洋中寒武世洋内俯冲作用:来自关子镇蛇绿混杂岩大洋斜长花岗岩的证据, columnId=1307047819974570720, journalTitle=西北地质, columnName=非主题, runingTitle=null, highlight=null, articleAbstract=

在关子镇蛇绿混杂岩带的黑湾一带新识别出一套花岗闪长岩–英云闪长岩的岩石组合,厘定其形成机制对商丹洋俯冲消减及碰撞闭合时限等问题的研究具有重要意义。笔者对片麻状花岗闪长岩和变质英云闪长岩开展了岩石学、全岩地球化学研究,对片麻状花岗闪长岩开展了LA-ICP MS锆石 U-Pb定年、Lu-Hf 同位素、全岩Rb-Sr 和Sm-Nd同位素研究。结果显示,片麻状花岗闪长岩和变质英云闪长岩稀土和微量元素含量低,变质英云闪长岩具显著Eu正异常,且二者均具大洋斜长花岗岩特征;获得片麻状花岗闪长岩年龄为(512.6±2.0 )Ma,εHf(t)值为+8.9~+13.8,显示其岩浆源区为亏损地幔;花岗闪长岩的ISr值为0.7046~0.7053,εNd(t)值为+2.55~+3.08。结合区域构造演化,认为该套大洋斜长花岗岩为新生地幔玄武质岩石在低温(602.9~707.4 ℃)低压(<0.2 G Pa)条件下部分熔融形成的酸性岩浆侵位而成,形成于中寒武世早期与商丹洋俯冲有关的岛弧环境。

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吴纪修(1984−),男,博士,高级工程师,从事地质矿产及钻探工艺研究工作。E−mail:

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Chemical Geology, 2000, 168: 279−281., articleTitle=JNdi-1: A neodymium isotopic reference in consistency with LaJolla neodymium, refAbstract=null), Reference(id=1307086123201754024, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, doi=null, pmid=null, pmcid=null, year=1991, volume=94, issue=2, pageStart=85, pageEnd=104, url=null, language=null, rfNumber=51, rfOrder=67, authorNames=null, journalName=Chemical Geology, refType=null, unstructuredReference=Thirlwall M F. Long-term reproducibility of multicollector Sr and Nd isotope ratio[J]. 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1.秦岭群;2.李子园群一岩组;3.李子园群二岩组;4.太阳寺组;5.大草滩组;6.小河子组;7.麦积山组;8.甘肃群/第四系;9.早奥陶世花岗质糜棱岩;10.新元古代片麻状花岗闪长岩;11.晚寒武世片麻状花岗闪长岩类;12.中晚寒武世片麻状石英闪长岩类;13.中寒武世大洋斜长花岗岩类;14.强片理化斜长角闪岩、绿泥阳起片岩;15.强片理化变粒岩、云母片岩;16.斜长角闪岩; 17.古元古界大理岩;18.寒武纪大理岩;19.寒武纪变粒岩;20.薄层状石英阳起片岩、绿泥阳起片岩;21.变质超基性岩;22.寒武纪变质辉长岩;23.奥陶纪辉长岩;24.辉长闪长岩;25.早志留世二长花岗岩;26.同位素采样位置;27.逆断裂;28.正断层;29.逆冲推覆构造;30.右型走滑断层;31.性质不明断层;32.韧性剪切带

, figureFileSmall=EC1HZB9kAKvej8tddLAKgA==, figureFileBig=5r3og/8X5vAChst0CFysWQ==, tableContent=null), ArticleFig(id=1307086114460824390, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.2, caption=(a,c) Outcrops and (b, d) microscope characteristics of gneiss granodiorite and metamorphic tonalite, figureFileSmall=dFRz/G5XXljuLjRXGZG4tA==, figureFileBig=5q4/LUE6c1+Ex0t+jdt7KQ==, tableContent=null), ArticleFig(id=1307086114540516167, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=图2, caption=片麻状花岗闪长岩和变质英云闪长岩野外(a、c)及镜下特征(b、d)

Q. 石英;Pl. 斜长石;Kfs. 钾长石;Hb. 角闪石;Bt. 黑云母

, figureFileSmall=dFRz/G5XXljuLjRXGZG4tA==, figureFileBig=5q4/LUE6c1+Ex0t+jdt7KQ==, tableContent=null), ArticleFig(id=1307086114620207944, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.3, caption=(a) SiO2-( K2O+Na2O) diagram, (b) An-Ab-Or diagram, (c) SiO2-K2O diagram, (d) A/CNK-A/NK diagram, figureFileSmall=CIGqK0GIL5d5kv9vGkj05A==, figureFileBig=pAwwQPtYbP5UBXRol7sXow==, tableContent=null), ArticleFig(id=1307086114699899721, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=图3, caption=SiO2-( K2O+Na2O)图解(a;底图据Le Bas et al., 1986)、An-Ab-Or分类图解(b;底图据Middlemost, 1994)、SiO2-K2O图解(c;底图据Roberts and Clemens, 1993)、A/CNK-A/NK(d;底图据Frost et al., 2001), figureFileSmall=CIGqK0GIL5d5kv9vGkj05A==, figureFileBig=pAwwQPtYbP5UBXRol7sXow==, tableContent=null), ArticleFig(id=1307086114783785802, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.4, caption=(a) Chondrite-normalized REE patterns and (b) trace element spider diagram of oceanic plagiogranite from the Guanzi town, figureFileSmall=ZPaIbnjn4HrifVQ/jaWJMA==, figureFileBig=7IBOEW5JV++rAOwD406qag==, tableContent=null), ArticleFig(id=1307086114884449099, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=图4, caption=关子镇大洋斜长花岗岩稀土配分曲线(a;标准值据Sun et al., 1989)、微量元素蛛网图(b;标准值据Pearce et al., 1984), figureFileSmall=ZPaIbnjn4HrifVQ/jaWJMA==, figureFileBig=7IBOEW5JV++rAOwD406qag==, tableContent=null), ArticleFig(id=1307086114980918092, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.5, caption=(a) Cathodoluminescence images for representative zircons and (b) LA-ICP-MS U-Pb ages concordant diagram of zircons, figureFileSmall=VDZirVkj18eext7nB8TZ+A==, figureFileBig=hryfUF17GEAdi6C765zNzA==, 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al.,2000)、拉斑玄武岩系统中富SiO2实验熔体SiO2-TiO2关系图(b;底图据Koepke et al.,2007), figureFileSmall=8f7VMacuI4+Lt9d/7gg+iA==, figureFileBig=SnNF+GN6bZjiYg0PsBC4Eg==, tableContent=null), ArticleFig(id=1307086115861721942, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.10, caption=Ternary cojunction pressure curves of An-Ab-Qtz, figureFileSmall=v3SdDIxehGgTZACG29jVVw==, figureFileBig=uM0mFhj8WZhKjYfYihhJ3w==, tableContent=null), ArticleFig(id=1307086115941413719, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=图10, caption=An-Ab-Qtz三元共结压力曲线图(底图据Winter,2001), figureFileSmall=v3SdDIxehGgTZACG29jVVw==, figureFileBig=uM0mFhj8WZhKjYfYihhJ3w==, tableContent=null), ArticleFig(id=1307086116029494104, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Fig.11, caption=Tectonic setting discrimination diagrams of oceanic plagiogranite in Guanzi town, figureFileSmall=weCFAWeXhxxfdO2YreFaPw==, figureFileBig=4OqQV/zr0AbyA+7uHRuumA==, tableContent=null), ArticleFig(id=1307086116113380185, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=图11, caption=关子镇大洋斜长花岗岩构造环境判别图解(a、b、c 底图据Pearce et al., 1984; d 底图据Batchelor et al.,1985), figureFileSmall=weCFAWeXhxxfdO2YreFaPw==, figureFileBig=4OqQV/zr0AbyA+7uHRuumA==, tableContent=null), ArticleFig(id=1307086116188877658, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Tab.1, caption=

Major element (%) and trace element (10−6) analyses of the oceanic plagiogranites in Guanzi town

, figureFileSmall=null, figureFileBig=null, tableContent=
样号YD0083-1YD0083-2YD0083-3YD0083-4QL19811-1QL19811-2QL19811-3
岩性片麻状花岗闪长岩变质英云闪长岩
SiO269.8170.1369.4770.0273.1873.9775.21
Al2O314.4714.1114.1613.7414.3214.7713.66
TiO20.210.240.230.220.030.030.03
Fe2O32.342.492.181.602.092.082
FeO1.941.722.482.801.751.651.85
CaO4.576.295.095.014.134.083.9
MgO1.551.111.731.881.091.150.88
K2O0.600.660.410.410.20.190.17
Na2O3.471.923.283.122.221.962.67
MnO0.0890.0850.1090.1260.0280.0290.024
P2O50.0500.0510.0520.0460.0140.0130.013
LOI0.620.910.470.630.560.480.35
Total99.7299.7399.6699.6299.61100.40100.76
V85.491.092.889.66.014.684.4
Cr5.555.525.725.738.3812.310.7
Co8.435.6510.410.84.94.873.22
Ni4.754.404.865.248.841514.8
Rb19.215.711.511.78.797.866.67
Sr10724910210510393.888.3
Zr65.753.964.664.517.912.315.9
Nb1.221.691.401.340.530.430.45
Cd0.0590.0290.0520.0540.0230.0280.015
Cs11.05.085.585.542.32.082.16
Ba94.984.966.069.561.652.742.1
Hf2.061.821.992.170.560.390.51
Ta0.130.220.670.140.410.290.29
Pb3.102.962.863.086.966.85.87
Th1.141.501.191.220.190.150.14
U0.350.850.370.360.0650.0630.07
Y11.113.512.012.40.930.860.78
La3.664.933.513.131.040.90.99
Ce7.9610.27.567.461.811.61.74
Pr0.981.301.010.950.190.160.19
Nd4.045.454.384.070.690.610.73
Sm1.081.411.161.210.140.120.11
Eu0.340.450.360.380.210.190.2
Gd1.211.571.281.340.140.130.12
Tb0.240.310.260.280.020.020.02
Dy1.772.211.872.020.140.130.12
Ho0.380.480.420.470.0330.0330.023
Er1.181.461.261.350.110.10.091
Tm0.230.290.250.260.0230.0170.018
Yb1.511.871.571.720.140.140.12
Lu0.260.310.270.290.0260.0260.02
), ArticleFig(id=1307086116293735259, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=表1, caption=

关子镇大洋斜长花岗岩类主量元素(%)和微量元素(10−6)含量

, figureFileSmall=null, figureFileBig=null, tableContent=
样号YD0083-1YD0083-2YD0083-3YD0083-4QL19811-1QL19811-2QL19811-3
岩性片麻状花岗闪长岩变质英云闪长岩
SiO269.8170.1369.4770.0273.1873.9775.21
Al2O314.4714.1114.1613.7414.3214.7713.66
TiO20.210.240.230.220.030.030.03
Fe2O32.342.492.181.602.092.082
FeO1.941.722.482.801.751.651.85
CaO4.576.295.095.014.134.083.9
MgO1.551.111.731.881.091.150.88
K2O0.600.660.410.410.20.190.17
Na2O3.471.923.283.122.221.962.67
MnO0.0890.0850.1090.1260.0280.0290.024
P2O50.0500.0510.0520.0460.0140.0130.013
LOI0.620.910.470.630.560.480.35
Total99.7299.7399.6699.6299.61100.40100.76
V85.491.092.889.66.014.684.4
Cr5.555.525.725.738.3812.310.7
Co8.435.6510.410.84.94.873.22
Ni4.754.404.865.248.841514.8
Rb19.215.711.511.78.797.866.67
Sr10724910210510393.888.3
Zr65.753.964.664.517.912.315.9
Nb1.221.691.401.340.530.430.45
Cd0.0590.0290.0520.0540.0230.0280.015
Cs11.05.085.585.542.32.082.16
Ba94.984.966.069.561.652.742.1
Hf2.061.821.992.170.560.390.51
Ta0.130.220.670.140.410.290.29
Pb3.102.962.863.086.966.85.87
Th1.141.501.191.220.190.150.14
U0.350.850.370.360.0650.0630.07
Y11.113.512.012.40.930.860.78
La3.664.933.513.131.040.90.99
Ce7.9610.27.567.461.811.61.74
Pr0.981.301.010.950.190.160.19
Nd4.045.454.384.070.690.610.73
Sm1.081.411.161.210.140.120.11
Eu0.340.450.360.380.210.190.2
Gd1.211.571.281.340.140.130.12
Tb0.240.310.260.280.020.020.02
Dy1.772.211.872.020.140.130.12
Ho0.380.480.420.470.0330.0330.023
Er1.181.461.261.350.110.10.091
Tm0.230.290.250.260.0230.0170.018
Yb1.511.871.571.720.140.140.12
Lu0.260.310.270.290.0260.0260.02
), ArticleFig(id=1307086116402787164, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Tab.2, caption=

LA-ICP-MS U-Pb dating of zircons from Heiwan gneissic granodiorite

, figureFileSmall=null, figureFileBig=null, tableContent=
点号含量(10−6)同位素比值年龄(Ma)
PbThU207Pb/206Pb±1σ207Pb/235U±1σ206Pb/238U±1σ207Pb/235U±1σ206Pb/238U±1σ
160.56167.31667.180.05840.00060.67130.00860.08330.0006521.485.20515.973.83
276.96410.48782.030.05920.00060.68310.00680.08380.0005528.644.08518.533.17
319.1466.23212.250.05870.00090.65830.01030.08140.0005513.596.28504.533.28
469.80210.76762.970.05830.00060.67390.00820.08390.0007523.114.98519.084.03
513.4531.61152.750.05670.00090.64240.01100.08220.0006503.796.80509.293.74
619.1746.50217.080.05700.00090.64460.00990.08200.0005505.156.12508.283.25
721.9176.48242.690.05840.00100.65590.01170.08140.0006512.107.17504.683.53
817.2947.54195.130.05700.00080.64160.00980.08160.0005503.296.08505.673.18
911.0124.03124.950.05910.00120.67160.01420.08240.0007521.718.60510.483.90
1023.3185.61254.290.05870.00080.66910.00960.08270.0005520.165.87512.023.19
1127.39108.97300.470.05850.00090.66090.01030.08200.0007515.186.33507.954.27
1216.2047.14181.490.05840.00110.66380.01310.08240.0007516.938.01510.374.43
1315.4135.02173.210.05910.00120.67870.01250.08350.0008525.967.55517.204.57
1439.13117.29429.180.05670.00080.65750.00910.08380.0005513.075.60518.902.93
1518.5754.61205.110.05720.00090.65790.01060.08340.0006513.336.50516.573.63
1620.5961.23227.070.05960.00100.67970.01100.08280.0006526.616.66513.063.81
1716.1648.41179.190.06020.00110.69080.01230.08340.0007533.317.40516.483.95
1824.9891.21271.240.05620.00100.64550.01220.08320.0006505.737.50515.293.47
1920.8259.87233.030.05730.00100.65180.01160.08250.0006509.597.12511.003.43
209.9424.33111.370.06040.00130.69350.01670.08320.0007534.889.99515.084.11
2116.2344.93181.600.05760.00100.65150.01230.08200.0006509.397.54508.123.51
2217.1034.26195.040.05690.00100.65020.01280.08280.0006508.607.90512.613.79
2311.8625.73134.420.05640.00130.65070.01490.08380.0010508.889.19518.815.75
2431.02145.37328.520.05790.00080.66450.00960.08330.0006517.375.88515.593.81
2513.3230.58149.100.05900.00120.67710.01320.08330.0006525.017.99515.743.52
), ArticleFig(id=1307086116511839069, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=表2, caption=

黑湾片麻状花岗闪长岩锆石LA-ICP-MS U-Pb测年数据

, figureFileSmall=null, figureFileBig=null, tableContent=
点号含量(10−6)同位素比值年龄(Ma)
PbThU207Pb/206Pb±1σ207Pb/235U±1σ206Pb/238U±1σ207Pb/235U±1σ206Pb/238U±1σ
160.56167.31667.180.05840.00060.67130.00860.08330.0006521.485.20515.973.83
276.96410.48782.030.05920.00060.68310.00680.08380.0005528.644.08518.533.17
319.1466.23212.250.05870.00090.65830.01030.08140.0005513.596.28504.533.28
469.80210.76762.970.05830.00060.67390.00820.08390.0007523.114.98519.084.03
513.4531.61152.750.05670.00090.64240.01100.08220.0006503.796.80509.293.74
619.1746.50217.080.05700.00090.64460.00990.08200.0005505.156.12508.283.25
721.9176.48242.690.05840.00100.65590.01170.08140.0006512.107.17504.683.53
817.2947.54195.130.05700.00080.64160.00980.08160.0005503.296.08505.673.18
911.0124.03124.950.05910.00120.67160.01420.08240.0007521.718.60510.483.90
1023.3185.61254.290.05870.00080.66910.00960.08270.0005520.165.87512.023.19
1127.39108.97300.470.05850.00090.66090.01030.08200.0007515.186.33507.954.27
1216.2047.14181.490.05840.00110.66380.01310.08240.0007516.938.01510.374.43
1315.4135.02173.210.05910.00120.67870.01250.08350.0008525.967.55517.204.57
1439.13117.29429.180.05670.00080.65750.00910.08380.0005513.075.60518.902.93
1518.5754.61205.110.05720.00090.65790.01060.08340.0006513.336.50516.573.63
1620.5961.23227.070.05960.00100.67970.01100.08280.0006526.616.66513.063.81
1716.1648.41179.190.06020.00110.69080.01230.08340.0007533.317.40516.483.95
1824.9891.21271.240.05620.00100.64550.01220.08320.0006505.737.50515.293.47
1920.8259.87233.030.05730.00100.65180.01160.08250.0006509.597.12511.003.43
209.9424.33111.370.06040.00130.69350.01670.08320.0007534.889.99515.084.11
2116.2344.93181.600.05760.00100.65150.01230.08200.0006509.397.54508.123.51
2217.1034.26195.040.05690.00100.65020.01280.08280.0006508.607.90512.613.79
2311.8625.73134.420.05640.00130.65070.01490.08380.0010508.889.19518.815.75
2431.02145.37328.520.05790.00080.66450.00960.08330.0006517.375.88515.593.81
2513.3230.58149.100.05900.00120.67710.01320.08330.0006525.017.99515.743.52
), ArticleFig(id=1307086116599919454, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Tab.3, caption=

Lu-Hf isotope analysis results from Heiwan gneissic granodiorite

, figureFileSmall=null, figureFileBig=null, tableContent=
点号176Yb/177Hf176Lu/177Hf176Hf/177Hf2σ(176Hf/177Hf)iεHf(0)εHf(t)TDMTDMCfLu/Hf
10.0511440.0027730.2828240.0000230.2827971.812.3637701−0.92
20.0267750.0014490.2827670.0000180.282753−0.210.8696798−0.96
30.0577890.0029210.2828210.0000210.2827941.711.9644716−0.91
40.0443230.0023960.2828000.0000170.2827761.011.6667746−0.93
50.0477640.0025050.2827720.0000190.2827480.010.4709816−0.92
60.0519430.0027450.2827900.0000240.2827640.610.9687780−0.92
70.0604910.0030710.2827980.0000220.2827690.911.0682772−0.91
80.0594250.0030320.2827800.0000240.2827510.310.4708811−0.91
90.0350340.0019040.2827340.0000220.282716−1.39.3753887−0.94
100.0588980.0029390.2828500.0000200.2828222.813.0601647−0.91
110.0669470.0033690.2827960.0000220.2827640.910.9690780−0.90
120.0544130.0028640.2828140.0000220.2827861.511.7654729−0.91
130.0440360.0024540.2827740.0000230.2827510.110.6705805−0.93
140.0412170.0022310.2828220.0000190.2828001.812.4631692−0.93
150.0656860.0033270.2827340.0000270.282701−1.48.9784916−0.90
160.0628300.0031480.2828730.0000230.2828433.613.8570599−0.91
170.0404210.0021430.2828010.0000220.2827801.011.7660738−0.94
180.0618460.0030700.2827970.0000210.2827670.911.2684769−0.91
190.0547470.0028320.2828220.0000250.2827951.812.1641708−0.91
200.0304610.0015900.2828140.0000220.2827991.512.3631697−0.95
210.0320580.0017640.2827980.0000240.2827810.911.5658742−0.95
220.0282860.0015230.2827880.0000230.2827730.611.3668757−0.95
230.0336250.0018570.2827950.0000210.2827770.811.6664745−0.94
240.1044970.0051380.2827950.0000340.2827450.810.4729819−0.85
250.0396480.0021480.2827580.0000260.282737−0.510.1723837−0.94
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黑湾片麻状花岗闪长岩Lu-Hf 同位素分析结果

, figureFileSmall=null, figureFileBig=null, tableContent=
点号176Yb/177Hf176Lu/177Hf176Hf/177Hf2σ(176Hf/177Hf)iεHf(0)εHf(t)TDMTDMCfLu/Hf
10.0511440.0027730.2828240.0000230.2827971.812.3637701−0.92
20.0267750.0014490.2827670.0000180.282753−0.210.8696798−0.96
30.0577890.0029210.2828210.0000210.2827941.711.9644716−0.91
40.0443230.0023960.2828000.0000170.2827761.011.6667746−0.93
50.0477640.0025050.2827720.0000190.2827480.010.4709816−0.92
60.0519430.0027450.2827900.0000240.2827640.610.9687780−0.92
70.0604910.0030710.2827980.0000220.2827690.911.0682772−0.91
80.0594250.0030320.2827800.0000240.2827510.310.4708811−0.91
90.0350340.0019040.2827340.0000220.282716−1.39.3753887−0.94
100.0588980.0029390.2828500.0000200.2828222.813.0601647−0.91
110.0669470.0033690.2827960.0000220.2827640.910.9690780−0.90
120.0544130.0028640.2828140.0000220.2827861.511.7654729−0.91
130.0440360.0024540.2827740.0000230.2827510.110.6705805−0.93
140.0412170.0022310.2828220.0000190.2828001.812.4631692−0.93
150.0656860.0033270.2827340.0000270.282701−1.48.9784916−0.90
160.0628300.0031480.2828730.0000230.2828433.613.8570599−0.91
170.0404210.0021430.2828010.0000220.2827801.011.7660738−0.94
180.0618460.0030700.2827970.0000210.2827670.911.2684769−0.91
190.0547470.0028320.2828220.0000250.2827951.812.1641708−0.91
200.0304610.0015900.2828140.0000220.2827991.512.3631697−0.95
210.0320580.0017640.2827980.0000240.2827810.911.5658742−0.95
220.0282860.0015230.2827880.0000230.2827730.611.3668757−0.95
230.0336250.0018570.2827950.0000210.2827770.811.6664745−0.94
240.1044970.0051380.2827950.0000340.2827450.810.4729819−0.85
250.0396480.0021480.2827580.0000260.282737−0.510.1723837−0.94
), ArticleFig(id=1307086116801246048, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Tab.4, caption=

Rb-Sr isotope analysis results from Heiwan gneissic granodiorite

, figureFileSmall=null, figureFileBig=null, tableContent=
样品编号岩石类型Rb(10−6)Sr(10−6)87Rb/86Sr87Sr/86SrISr
GZ-10花岗闪长岩3.087110.40.0810.705320.70473
GZ-172.9757.50.080.705830.70525
YD0083-13.1094130.980.08120.705220.70463
), ArticleFig(id=1307086116893520737, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=表4, caption=

黑湾片麻状花岗闪长岩Rb-Sr同位素分析结果

, figureFileSmall=null, figureFileBig=null, tableContent=
样品编号岩石类型Rb(10−6)Sr(10−6)87Rb/86Sr87Sr/86SrISr
GZ-10花岗闪长岩3.087110.40.0810.705320.70473
GZ-172.9757.50.080.705830.70525
YD0083-13.1094130.980.08120.705220.70463
), ArticleFig(id=1307086116989989730, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=EN, label=Tab.5, caption=

Sm-Nd isotope analysis results from Heiwan gneissic granodiorite

, figureFileSmall=null, figureFileBig=null, tableContent=
样品编号岩石类型Sm(10−6)Nd(10−6)147Sm/144Nd143Nd/144NdεNd(t)
GZ-10花岗闪长岩1.774.5750.2340.5129183.02
GZ-171.0913.2570.2020.5127862.55
YD0083-11.90584.8390.2410.5129443.08
), ArticleFig(id=1307086117069681507, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086107716383481, language=CN, label=表5, caption=

黑湾片麻状花岗闪长岩Sm-Nd同位素分析结果

, figureFileSmall=null, figureFileBig=null, tableContent=
样品编号岩石类型Sm(10−6)Nd(10−6)147Sm/144Nd143Nd/144NdεNd(t)
GZ-10花岗闪长岩1.774.5750.2340.5129183.02
GZ-171.0913.2570.2020.5127862.55
YD0083-11.90584.8390.2410.5129443.08
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商丹洋中寒武世洋内俯冲作用:来自关子镇蛇绿混杂岩大洋斜长花岗岩的证据
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吴纪修 1 , 袁彦伟 2 , 李广栋 3 , 王晓赛 1 , 毕志伟 3
西北地质 | 非主题 2026,59(4): 270-284
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西北地质 |非主题 2026 , 59 (4) : 270 -284
商丹洋中寒武世洋内俯冲作用:来自关子镇蛇绿混杂岩大洋斜长花岗岩的证据
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吴纪修1 , 袁彦伟2, 李广栋3, 王晓赛1, 毕志伟3
作者信息
  • 1中国地质科学院勘探技术研究所,河北 廊坊 065000
  • 2甘肃省矿产资源储量评审中心, 甘肃 兰州 730000
  • 3河北省区域地质调查院,河北 廊坊 065000
作者简介:

吴纪修(1984−),男,博士,高级工程师,从事地质矿产及钻探工艺研究工作。E−mail:

Early Cambrian Intra-Oceanic Subduction of the Paleo-Shangdan Ocean: New Evidences from the Oceanic Plagiogranite in the Guanzi Town Ophiolite Melange
Jixiu WU1 , Yanwei YUAN2, Guangdong LI3, Xiaosai WANG1, Zhiwei BI3
Affiliations
  • 1Institute of Exploration Techniques, CAGS, Langfang 065000, Hebei, China
  • 2Gansu Assessment Center of Mineral Resources Reserves, Lanzhou 730000, Gansu, China
  • 3Hebei Regional Geological Survey Institute, Langfang 065000, Hebei, China
出版时间: 2026-08-20 doi: 10.12401/j.nwg.2025041
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在关子镇蛇绿混杂岩带的黑湾一带新识别出一套花岗闪长岩–英云闪长岩的岩石组合,厘定其形成机制对商丹洋俯冲消减及碰撞闭合时限等问题的研究具有重要意义。笔者对片麻状花岗闪长岩和变质英云闪长岩开展了岩石学、全岩地球化学研究,对片麻状花岗闪长岩开展了LA-ICP MS锆石 U-Pb定年、Lu-Hf 同位素、全岩Rb-Sr 和Sm-Nd同位素研究。结果显示,片麻状花岗闪长岩和变质英云闪长岩稀土和微量元素含量低,变质英云闪长岩具显著Eu正异常,且二者均具大洋斜长花岗岩特征;获得片麻状花岗闪长岩年龄为(512.6±2.0 )Ma,εHf(t)值为+8.9~+13.8,显示其岩浆源区为亏损地幔;花岗闪长岩的ISr值为0.7046~0.7053,εNd(t)值为+2.55~+3.08。结合区域构造演化,认为该套大洋斜长花岗岩为新生地幔玄武质岩石在低温(602.9~707.4 ℃)低压(<0.2 G Pa)条件下部分熔融形成的酸性岩浆侵位而成,形成于中寒武世早期与商丹洋俯冲有关的岛弧环境。

大洋斜长花岗岩  /  商丹洋  /  部分熔融  /  俯冲作用  /  关子镇

A series of quartz granodiorite-granodiorite rock assemblage has been identified in Heiwan area of the Guanzi Town ophiolite mélange. In order to determine the formation mechanism of them, the petrology and whole rock geochemistry of gneissic granodiorite and metamorphic tonalite were conducted, and the zircon U-Pb dating, Lu-Hf isotope, Rb-Sr and Sm-Nd isotope of gneissic granodiorite were conducted. The results show that gneissic granodiorite and metamorphic tonalite have low contents of rare earth and trace elements, and metamorphic tonalite has obvious Eu positive anomaly, and both of them have the characteristics of oceanic plagiogranite. The age of granodiorite obtained is 512.6±2.0 Ma, and the εHf(t) value varies from +8.9 to +13.8, indicating that its magma source area is depleted mantle. The ISr value of granodiorite ranges from 0.7046 to 0.7053, and the εNd(t) value ranges from +2.55 to +3.08. Combined with the regional tectonic evolution, this set of ocean plagiogranite was formed by the emplacement of acidic magma formed by partial melting of basaltic rocks in the mantle at low temperature (602.9~707.4 ℃) and low pressure (< 0.2 GPa), and was formed in the island arc environment related to the subduction of Shangdan Ocean in the early Middle Cambrian.

oceanic plagiogranite  /  Shangdan Ocean  /  partial melting  /  subduction  /  Guanzi town
吴纪修, 袁彦伟, 李广栋, 王晓赛, 毕志伟. 商丹洋中寒武世洋内俯冲作用:来自关子镇蛇绿混杂岩大洋斜长花岗岩的证据. 西北地质, 2026 , 59 (4) : 270 -284 . DOI: 10.12401/j.nwg.2025041
Jixiu WU, Yanwei YUAN, Guangdong LI, Xiaosai WANG, Zhiwei BI. Early Cambrian Intra-Oceanic Subduction of the Paleo-Shangdan Ocean: New Evidences from the Oceanic Plagiogranite in the Guanzi Town Ophiolite Melange[J]. Northwestern Geology, 2026 , 59 (4) : 270 -284 . DOI: 10.12401/j.nwg.2025041
大洋斜长花岗岩一词最早由Coleman et al.(1975)提出,用来描述在蛇绿岩中与镁铁质岩石有密切共生关系的浅色岩,如闪长岩、英云闪长岩、奥长花岗岩和钠长花岗岩,其组成以浅色矿物斜长石和石英为主,含少量铁镁质矿物,且具高Si,中Al,富Na,贫K的地球化学特征。关于大洋斜长花岗岩的成因问题,早期普遍认为是洋中脊玄武岩(MORR)结晶分异的产物(Aldiss, 1981)。然而,不同学者先后提出其成因为铁镁质洋壳部分熔融或辉长岩和方辉橄榄岩先后部分熔融的观点( Rollinson, 2009;France et al., 2010);其形成环境也不仅限于洋中脊,可以是板块俯冲带和弧后裂谷(Pedersen et al., 1984)。俯冲起始和前弧伸展是古俯冲带的重要构造过程(Chen et al., 2014),一般与海洋岩石圈的负浮力和板片后退有关。此外,俯冲起始可导致大洋板块和上覆沉积物的部分熔融,导致酸性岩和高镁安山岩的形成(Yang, 2022)。
关子镇蛇绿混杂岩是天水–武山地区蛇绿混杂岩的重要组成部分,主要由蛇纹岩(变质橄榄岩)、变辉石岩(包括阳起石岩)、斜长角闪片岩(变质基性火山岩)、变中细粒辉长岩等组成,是商丹缝合带的西延(裴先治等,2004;董云鹏等,2008;李王晔,2008;刘军峰,2008;李源,2011;操雨森等,2020)。裴先治等(2004)首先厘定了镇蛇绿混杂岩,并获得辉长岩的锆石 U-Pb年龄为(499.7±1.8)Ma,认为岩石具 N-MORB 的特征,形成于岛弧环境,是西秦岭北缘李子园镇–关子镇–武山洋盆扩张过程中岩浆活动的产物。杨钊等(2006)在关子镇东沟一带获得与变质基性火山岩紧密伴生的变质辉长岩锆石 U-Pb年龄为 471 Ma,据此认为商丹古洋盆存在的时限可延续至 470 Ma。李王晔等(2007)获得蛇绿岩中辉长岩和闪长岩的锆石 SHRIMP U-Pb 年龄分别为(534±9)Ma 和(517±8)Ma,认为关子镇蛇绿岩形成于洋中脊环境。毕志伟等(2022)获得关子镇蛇绿混杂岩中辉石石英闪长岩锆石 U-Pb 年龄为 (514±4.5)Ma,形成于商丹洋俯冲时的弧前环境。吴纪修等(2020,2021a)在海子沟一带获得变质堆晶辉长岩锆石 U-Pb 年龄为(489.6±1.1)Ma,在燕家湾一带获得变质辉长岩U-Pb 年龄为( 444±4)Ma。以上资料显示蛇绿岩的形成时代主要为早寒武世—晚奥陶世。笔者在关子镇地区开展了1∶5万关子镇幅、四门镇幅区域地质调查以及关子镇蛇绿混杂岩1∶1万专项调查工作,在混杂带内新识别出一套中酸性侵入岩组合,主要为片麻状花岗闪长岩和变质英云闪长岩。通过对其开展了地球化学、锆石U-Pb 年代学、原位Hf 同位素和全岩 Rb-Sr、Sm-Nd同位素研究,探讨了其岩石成因、构造环境和地质意义,以期为商丹洋的俯冲消亡时间提供约束。
研究区位于柴达木–华北板块和羌塘–扬子–华南板块的接合部位,是古亚洲构造域、特提斯构造域和太平洋构造域复合叠加的构造部位(图1a)。以NW–SE向纵贯全区中部的关子镇蛇绿混杂岩带为界,北东侧属祁连–北秦岭加里东造山带,南西属中秦岭新元古代—晚古生代裂陷大陆边缘夏河–礼县陆缘沉积区。
区域地层主要出露古元古代秦岭岩群、新元古代木其滩岩组、寒武纪—奥陶系关子镇蛇绿混杂岩、早奥陶世李子园群、志留纪太阳寺组、泥盆纪-石炭纪大草滩组、三叠纪小河子组、白垩纪麦积山组、新近纪、第四纪等(吴纪修等,2020,2021a,2021b;毕志伟等,2022)。关子镇蛇绿混杂岩北界为蛇绿岩带北界断裂,南界为蛇绿岩带南界断裂,整体与区域构造线方向一致,呈NW–SE向带状展布,延伸约30 km,往NW和SE延伸出区外,出露宽度为2~9 km,整体形态呈现中部宽、北西和南东部较窄的透镜状(图1b),双向逆冲推覆于北东侧秦岭群和南西侧大草滩组之上,角度不整合于麦积山组以及甘肃群之下,并被花岗质糜棱岩侵位(吴纪修等,2020,2021a,2021b;图1b)。
关子镇蛇绿混杂岩带由基质和岩块组成,基质是具有强烈变形、强片理化特征的岩石,包括强片理化斜长角闪岩、角闪片岩和强片理化变粒岩、云母片岩两大类。岩块是指夹持在基质内、时代不同、岩性各异、变形较弱的“无根”地质体。区内岩块岩性较为复杂,多数属于岩石组合,少数为单一的岩性,整体可以分为3大类,其中蛇纹岩、辉长岩、斜长角闪岩岩块为蛇绿岩组成部分;寒武纪—奥陶纪变粒岩、大理岩、变质流纹岩(变质安山岩)、层状石英阳起片岩(石英角闪片岩、绿泥阳起片岩)等属于岛弧沉积–火山体系;花岗质片麻岩、石英大理岩、变粒岩等属于原华北地台变质基底部分。
笔者新识别出的花岗闪长岩–英云闪长岩的岩石组合呈构造岩片产出,与关子镇蛇绿混杂岩带中蛇绿岩紧密共生,在关子镇黑湾一带出露规模较大,其中见有闪长岩、角闪岩等中性、超基性岩的包体,接触界线或截然,或渐变过渡。片麻状花岗闪长岩为灰白色,片麻状构造,花岗结构。主要组成矿物为斜长石(~33%)、钾长石(~12%)、石英(~28%),角闪石(~22%)、黑云母(~4%)和其他副矿物(~6%),整体粒径为0.5~2.0 mm,主要集中在0.8~1.2 mm(图2a、图2b)。斜长石呈板状,半自形晶,粒径为0.5~1.0 mm。钾长石呈他形粒状晶,粒径为0.5~1.5 mm。石英为不规则他形粒状,彼此呈齿状镶嵌,呈集合体分布于斜长石和钾长石之间,消光不均匀,单体粒径为0.2~1.0 mm不等。黑云母呈鳞片状,单体粒径为0.5~1.0 mm;角闪石呈墨绿色,分布不均,暗色矿物集合体在岩石中呈断断续续的定向排列,其间被浅色粒状矿物分开。副矿物磷灰石,金属矿物常包裹在暗色矿物之中。
变质英云闪长岩为浅灰色,片麻状构造,粒状变晶结构。主要组成矿物为斜长石(60%~65%)、石英(~25%)、角闪石(~10%)、黑云母(3%~5%)、其它副矿物(~2%)(图2c、图2d)。斜长石呈他形粒状,镜下鉴定为其为中长石。石英呈他形粒状,可见波状消光。角闪石呈柱状,见于斜长石晶内。黑云母呈片状,与角闪石混杂。副矿物为磷灰石、榍石和少量金属矿物。
样品随野外调查和剖面测试采集(图1b),选择4件蚀变弱、风化弱的片麻状花岗闪长岩样品和3件变质英云闪长岩样品进行全岩地球化学分析,并对1件片麻状花岗闪长岩(YD0083-1)开展了锆石U-Pb 定年、Lu-Hf 同位素,全岩Rb-Sr、Sm-Nd 同位素分析。
全岩地球化学测试分析由河北省区域地质矿产调查研究所实验室完成,室内将样品手工碎至1~5 mm,轮流用稀硝酸与稀盐酸浸泡清洗,烘干后用不锈钢钵研磨至200 目用于化学分析。主量元素分析(除FeO)采用Panalytical公司PW440型X荧光光谱仪(XRF)测定,精度在1%以内,FeO单独采用湿法测试。微量元素和稀土元素采用ThermoFisher 公司X-Series p型电感藕合等离子质谱仪(ICPMS)测定,测试精度在5%以内。
锆石的挑选、制靶、背散射(BES)和阴极发光图像(CL)拍照由河北省区域地质矿产调查研究所实验室完成。锆石U-Pb 同位素定年和原位Lu-Hf 同位素分析在武汉上谱分析科技有限责任公司完成。U-Pb年代分析GeolasPro 激光剥蚀系统由COMPexPro 102 ArF 193 nm准分子激光器和MicroLas 光学系统组成,ICP-MS型号为Agilent 7700e,激光束斑和频率分别为32 μm和10 Hz,内标为国际锆石标样91500,对分析数据的离线处理采用软件ICPMSDataCal(Liu et al.,2010)完成。锆石Hf同位素分析激光剥蚀系统为Geolas HD,MC-ICP-MS为Neptune Plus,激光束斑和能量输出密度分别为44 μm和7.0 J/cm2,测试位置与U-Pb 定年点位相同或靠近,国际锆石标样CJ-1 作为Lu-Hf 同位素测试的监控。
全岩Rb-Sr和Sm-Nd 同位素测试在武汉上谱测试分析有限公司完成,采用的仪器为美国Thermo Fisher Scientific 公司的MC-ICP-MS(Neptune Plus)。Sr 同位素质量分馏校正采用86Sr/88Sr=0.1194 标准化,本次分析中Sr 同位素标样NBS987 的87Sr/86Sr 分析测试值为0.710243±11(2σ,n=4),与推荐值0.710241±12(2σ)在误差范围内一致(Thirlwall,1991)。Nd 同位素分析采用多接收等离子质谱仪MC-ICP-MS(Neptune),样品143Nd/144Nd 值用146Nd/144Nd=0.7219 标准化。Nd 同位素标样JNDi-1 的测定值为143Nd/144Nd=0.512117±06(2σ,n=5),与推荐值0.512115±07(2σ)在误差范围内一致(Tanaka et al., 2000)。
全岩地球化学测试结果(表1)显示,片麻状花岗闪长岩和变质英云闪长岩样品SiO2含量分别为69.45%~70.13%和73.18%~75.21%,TiO2含量分别为0.21%~0.24%和0.03%,CaO含量分别为4.57%~6.29%和3.9%~4.13%,Na2O分别为1.92%~3.47%和1.96%~2.67%。在硅碱图解中(图3a)片麻状花岗闪长岩落在花岗闪长岩区,变质英云闪长岩落在花岗岩区,这与岩相学特征一致;在An-Ab-Or 图解中所有样品均落至英云闪长岩区(3b)。两种岩石均具有低K的特征,且变质英云闪长岩具显著的高Si(图3c)。花岗闪长岩的A/CNK均小于1,为准铝质系列,变质英云闪长岩的A/CNK为1.03~1.04,为准铝质系列(图3d)。
所有样品的稀土总量明显偏低,片麻状花岗闪长岩稀土总量为24.84×10−6~32.24×10−6,在稀土元素配分图上为一组近水平的曲线(图4a),轻稀土略有富集至轻度亏损,重稀土相对富集,显示无明显Ce异常。变质英云闪长岩稀土总量与球粒陨石相当,为4.18×10−6~4.71×10−6,总体呈右倾的配分曲线,轻稀土富集,重稀土相对亏损,LREE/HREE值为6.01~7.44,(La/Yb)N 值为4.33~5.56,无明显Ce异常,显著正Eu异常,δEu值为4.54~5.30。在洋脊花岗岩片麻状花岗闪长岩与变质英云闪长岩具相似的微量元素配分模式上(图4b),大离子亲石元素Rb、Ba、Th相对富集,而高场强元素Nb、Y、Zr、Nb、Yb等相对亏损。
片麻状花岗闪长岩(YD0083-1)中选取25颗锆石进行U-Pb 同位素年代学测试(表2)。根据锆石阴极发光图像(图5a),锆石颗粒呈灰白色,自形–半自形柱状晶,颗粒大小约为100~150 μm,长宽比为1∶1.2~1∶6,围绕核部具有明显的震荡环带,个别发育扇形分带或平行晶体长轴的生长条带。锆石Th/U 值为0.18~0.52,具典型的岩浆锆石特征(胡运行等,2025;房明举等,2026;牛永静等,2026)。锆石年龄集中分布在谐和线上(图5b),206Pb/238U加权平均年龄为(512.6±2.0)Ma(MSWD =1.7,n=25),代表片麻状石英闪长岩的成岩年龄,表明其形成时代为中寒武世。
锆石Hf 同位素分析点位置和锆石U-Pb 测试点相同或靠近,获得25个锆石Lu-Hf 同位素数据(表3)。锆石的176Yb/177Hf值为0.026775~0.104497,176Lu/177Hf值为0.001449~0.005138(小于0.002),表明放射性成因176Hf 很少(董美玲等,2026;王旭东等,2026)。176Hf/177Hf值为0.282734~0.282873,εHf(t)值为9~13.8,集中分布在球粒陨石线和亏损地幔线之间(图6a),暗示岩石岩浆起源于亏损地幔或新生壳源物质部分熔融(吴福元等,2007)。锆石模式年龄tDM为570~784 Ma,tDM2为599~916 Ma。
样品Rb-Sr、Sm-Nd同位素结果(表4、表5)显示,片麻状花岗闪长岩的87Sr/86Sr值为0.70523~0.70583,IS值为0.70463~0.70525,143Nd/144Nd值为0.512786~0.512944,εNd(t)值为2.55~3.08,在87Sr/86Sr-εNd(t)图解中(图6b)集中分布在OIB与IAB的混合区。
片麻状花岗闪长岩、变质英云闪长岩均与关子镇蛇绿岩密切共生,既有侵入接触关系,又显示构造混杂接触关系。片麻状花岗闪长岩含少量钾长石,富石英和暗色矿物(角闪石、黑云母);变质英云闪长岩不含钾长石,富长英质组分。片麻状花岗闪长岩、变质英云闪长岩在岩石化学上显示富Na、贫K的特征,在 SiO2/Al2O3-A/CNK图解中(图7a),样品位于典型大洋斜长花岗岩区域附近(Sarvothaman,1993);在SiO2-K2O图解中(图7b),样品基本落入大洋斜长花岗岩范围(Coleman et al.,1975)。结合微量元素特征,判别本区该套岩石组合为大洋斜长花岗岩。
目前主要有4种模式解释大洋斜长花岗岩的成因:① 铁镁质岩部分熔融模型(Grimes et al.,2013);②玄武质岩浆结晶分异模型(Hunter et al.,1978);③ 奥长花岗岩/英云闪长岩部分熔融模型(Popov et al.,2002);④ 岩浆不混溶模型(Shastry et al.,2002;康磊等,2015)。关子镇地区还未发现更早的斜长花岗岩/英云闪长岩,因此不适合用岩浆不混溶模型或者早期奥长花岗岩/英云闪长岩部分熔融模式来解释。大洋斜长花岗岩与关子镇蛇绿岩密切共生,暗示其成因可能为玄武质岩浆结晶分异或铁镁质岩部分熔融。通常,SiO2与La或Rb含量关系可以判定结晶分异和部分熔融,如果结晶分异为主导,SiO2含量则正相关于La或Rb含量;反之,当部分熔融时,SiO2含量则负相关于La或Rb含量。关子镇大洋斜长花岗岩的SiO2含量与La无明显的正相关性,表明其成因并非主要来自结晶分异作用(图8a)。此外,在Rb/La-Rb图解(图8b)中,其显示出显著的部分熔融的演化趋势。
部分熔融形成的大洋斜长花岗岩多见于角闪岩相韧性剪切带中(Flagler et al., 1991),具有低Al、高Si,稀土配分曲线右倾及正Eu异常的特征(Flagler, 1991)。岩体的模式年龄明显大于其形成年龄,支持了铁镁质岩石部分熔融的成因模式,所有样品在AFM-CFM图中均落于变质玄武岩部分熔融区域(图9a)。此外,关子大洋斜长花岗岩的TiO2含量较低(0.03%~0.24%),样品在SiO2-TiO2图(图9b)中均落点于含水条件下辉长岩部分熔融范围,TiO2含量低于玄武质岩浆结晶分异和岩浆不混熔的底线,是镁铁质洋壳部分熔融的产物(Koepke et al.,2007;Grimes et al.,2013)。
关子镇大洋斜长花岗岩以中等Al2O3、高MgO和正εHf(t)值为特征,表现出亏损地幔源或新生壳源的地球化学亲和性。此外,关子大洋斜长花岗岩低Sr,显示了低压熔融环境(张旗等,2006)。实验岩石学证实,Al2O3的含量与成岩压力正相关(Barker et al.,1976)。以15%为界,当Al2O3的含量大于15%时,指示熔融压力大于1.6 GPa,反之,小于1.6 GPa(Rapp et al.,1991)。关子镇大洋斜长花岗岩的Al2O3含量为13.66%~14.77%,平均值为14.18%,说明熔融压力小于1.6 GPa。An-Ab-Qtz三元共结压力曲线图(图10)指示,样品压力应小于0.2 Gpa(Winter, 2001),也印证了上述推论。
Watson et al.(1983)根据高温实验获得了锆石溶解度模拟公式:TZr( ℃) = {12900/[lnDZr(496000/熔体) +0.85M+2195]}-273.15,式中的DZr为Zr分配系数。样品的M值为1.35~1.58,在推荐范围之内(0.9~1.7;Watson et al.,1983)。据此计算,得出锆石温度约为602.9~707.4 ℃,且岩浆中发育继承锆石,说明母岩浆中锆石已达饱和。因此,602.9~707.4 ℃ 可代表原始岩浆的初始岩浆温度(Miller et al., 2003)。关子镇大洋斜长花岗岩的熔融环境为低压(<0.1 GPa)和低温(737~781 ℃),并具有低Sr、高Yb的特征,符合<0.8 GPa(650~800 ℃)条件下含水拉斑玄武岩的熔融环境,其残留相应为斜长石+角闪石±斜方辉石±钛铁矿(无石榴子石;张旗等,2006)。
大洋斜长花岗岩的形成环境主要为洋中脊、板块俯冲带和弧后裂谷(Pedersen et al., 1984)。大洋中脊斜长花岗岩具有低的K2O、Al2O3、Sr含量及Sr/Y值,LREE略为亏损,明显区别于洋壳俯冲消减的高压环境下低钾玄武岩部分熔融形成的英云闪长岩、奥长花岗岩和花岗闪长岩组成的TTG岩石组合(具高的Al2O3、Sr含量,低的Y含量,高Sr/Y值及LREE富集)(Jiang et al., 2008)。关子镇大洋斜长花岗岩具中等的Al含量,低的K、Y含量,高Sr/Y值及LREE富集。在构造环境Y-Nb 判别图解中(图11a),所有样品落在火山弧花岗岩和同碰撞花岗岩范围内。在Yb+Ta-Rb图解中(图11b)落在火山弧花岗岩区,在Yb-Ta图解中(图11c),大部分落至火山岛弧花岗岩区,少量在火山弧花岗岩和同碰撞花岗岩界线附近,因此,结合区域构造背景初步认为关子镇大洋斜长花岗岩形成于岛弧构造背景。在花岗岩的R1-R2图解中(图11d),样品全部落入地幔分离的花岗岩范围内,暗示关子镇大洋斜长花岗岩很可能是岩石圈地幔部分熔融所产生的拉斑玄武质岩浆上侵的产物,这和上述分析的岩石成因类型是相符的。
关子镇蛇绿混杂岩是商丹蛇绿混杂岩的西延,是原始特提斯洋的分支。原特提斯洋的最初关闭发生在约500~460 Ma期间,导致几乎所有东亚板块首次汇聚拼合至冈瓦纳大陆的北缘。关子镇蛇绿混杂岩记录了商丹洋的初始俯冲的过程,关子镇大洋斜长花岗岩形成年龄为512.6 Ma,意味着从中寒武世蛇绿岩及伴生大洋斜长花岗岩已开始形成,大洋斜长花岗岩的出现暗示板块可能开始俯冲。Hf同位素模式年龄为570~784 Ma。结合上述讨论,认为其源岩是新元古代晚期的来源于亏损地幔的玄武质岩石,在中寒武世商丹洋开始洋内俯冲,该套玄武质岩石发生部分熔融,形成了中酸性–酸性岩浆,岩浆侵位形成关子镇大洋斜长花岗岩。
(1)关子镇一带新发现的片麻状花岗闪长岩-变质英云闪长岩组合属大洋斜长花岗岩,是与关子镇蛇绿岩密切共生的花岗质岩石。
(2)大洋斜长花岗岩中获得锆石U-Pb年龄为512.6 Ma,代表了该套大洋斜长花岗岩以及伴生关子镇蛇绿岩形成于中寒武世。
(3)大洋斜长花岗岩为地幔玄武质岩石在低压(<0.2 GPa)低温(602.9~707.4 ℃)条件下部分熔融形成的酸性岩浆侵位而成,形成于商丹洋早期与大洋板片俯冲有关的岛弧环境。

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2026年第59卷第4期
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doi: 10.12401/j.nwg.2025041
  • 接收时间:2024-04-25
  • 首发时间:2026-09-16
  • 出版时间:2026-08-20
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  • 收稿日期:2024-04-25
  • 修回日期:2026-01-23
  • 录用日期:2025-03-21
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    1中国地质科学院勘探技术研究所,河北 廊坊 065000
    2甘肃省矿产资源储量评审中心, 甘肃 兰州 730000
    3河北省区域地质调查院,河北 廊坊 065000
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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