Article(id=1246840127062954692, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246840121887187126, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-4193.2019.09.005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1541952000000, receivedDateStr=2018-11-12, revisedDate=1553875200000, revisedDateStr=2019-03-30, acceptedDate=null, acceptedDateStr=null, onlineDate=1775199451461, onlineDateStr=2026-04-03, pubDate=1569340800000, pubDateStr=2019-09-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1775199451461, onlineIssueDateStr=2026-04-03, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1775199451460, creator=13701087609, updateTime=1775199451460, updator=13701087609, issue=Issue{id=1246840121887187126, tenantId=1146029695717560320, journalId=1149651085930835976, year='2019', volume='41', issue='9', pageStart='1', pageEnd='190', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1775199450227, creator=13701087609, updateTime=1775200621889, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1246845036290265802, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246840121887187126, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1246845036290265803, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1246840121887187126, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=52, endPage=64, ext={EN=ArticleExt(id=1246840127436247766, articleId=1246840127062954692, tenantId=1146029695717560320, journalId=1149651085930835976, language=EN, title=Western Ross Sea sedimentary environment reconstruction since the Last Glacial Maximum based on organic carbon and biomarker analyses, columnId=1246840122952540345, journalTitle=Haiyang Xuebao, columnName=Special Column of Polar Research, runingTitle=null, highlight=null, articleAbstract=

Analyses of grain size, organic carbon and biomarker have been carried out for the core ANT32-RB16C, in order to identify the source of organic matter and reconstruct the sedimentary environment since the Last Glacial Maximum in the western Ross Sea. From the bottom to the top within the core, sub-ice-shelf, pre-ice-shelf and open-marine sedimentary environments can be differentiated. The combined parameters of biomarker indicate that organic matter is mainly a mixed input of terrigenous and marine origin. During the Last Glacial Maximum (24.8–20 ka BP), under the influence of ice sheet and the current condition, the organic matter content was low and its source was associated mainly with a marine origin, with a relatively low plankton productivity. During the Last Deglaciation (20–11.7 ka BP), the organic matter released by the dissolution of the glaciers in the retreat process of the Ross Ice Shelf, caused the increase of terrestrial organic matter. During the Holocene, the content of organic matter increased significantly, together with the proportion of marine origin input. The number of prokaryotes such as bacteria increased, resulting in a greater degree of degradation of short-chain n-alkanes. The redox condition in the study area is mainly affected by the ice shelf and sea ice limitation, and has little relationship with the organic matter content and the high-oxygen Antarctic Bottom Water. In general, from the Last Glacial Maximum to the Last Deglaciation, the study area sedimentary environment was affected by the Ross Ice Shelf, and by the climate since the Holocene.

, correspAuthors=Xibin Han, authorNote=null, correspAuthorsNote=null, copyrightStatement=Haiyang Xuebao, 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, authorCompany=null, fund=null, authors=null, authorsList=Lehui Song, Xibin Han, Jiabiao Li, Shu Gao, Geng Liu, Panpan Long), CN=ArticleExt(id=1246840129495651117, articleId=1246840127062954692, tenantId=1146029695717560320, journalId=1149651085930835976, language=CN, title=罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析, columnId=1246840123103535292, journalTitle=海洋学报, columnName=极地研究成果专栏, runingTitle=null, highlight=null, articleAbstract=

本文研究采自位于南极罗斯海西部的ANT32-RB16C柱状沉积物,根据粒度、有机碳和生物标志化合物数据探讨末次冰盛期(24.8 ~20 ka BP)以来该地区有机质来源及沉积环境特征。该柱状样记录了冰架下沉积、冰架前沉积、开阔海域沉积的沉积环境。指示有机质来源的生物标志化合物指标表明该柱状样中所含有机质主要为浮游植物、细菌等海源输入,同时伴有少量陆源物质混合输入。末次冰盛期,由于冰架的影响有机质含量较低,环流影响使得有机质受低等浮游藻类生物等海源影响较大。末次冰消期(20~11.7 ka BP),罗斯冰架消退,冰川溶解释放的有机质在此沉积,使得陆源有机质输入增多,有机质含量升高。进入全新世,有机质含量较末次冰盛期和末次冰消期明显升高,海源输入比例增大,同时细菌等原核生物增多,导致短链正构烷烃降解程度较大。研究区的氧化还原环境主要受冰架与海冰限制作用的影响,与有机质含量和高氧的南极底层水关系不大。总体来说,从末次冰盛期到末次冰消期,研究区沉积环境受罗斯冰架进退影响,全新世以来受气候变化影响。

, correspAuthors=韩喜彬, authorNote=null, correspAuthorsNote=
*韩喜彬,男,博士,副研究员,主要从事海洋地质研究工作。E-mail:
, copyrightStatement=版权所有©《海洋学报》编辑部 2023, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=60zbhj2UA5duvQvpcCcPAg==, magXml=cPE85PYDPAetT82cginf2Q==, pdfUrl=null, pdf=DpM7HJ+3mdJs9eSj1G5m/g==, pdfFileSize=6884179, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=bskEVQxE0BvUtubPNVVMOw==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=QTIWiyoS5ACqkvDFCNbYVg==, mapNumber=null, authorCompany=null, fund=null, authors=

宋乐慧(1994—),女,山东省枣庄市人,主要从事海洋沉积环境研究。E-mail:

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宋乐慧(1994—),女,山东省枣庄市人,主要从事海洋沉积环境研究。E-mail:

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1. Core ANT32-JB06[8]; 2. Core ANT32-JB04[19]; 3. Core GC1606[20]; AASW. Antarctic Surface Water; AABW. Antarctic Bottom Water; CDW. Circumpolar Deep Water; MCDW. Modified Circumpolar Deep Water; DSW. Dense Shelf Water; ISW. Ice Shelf Water

, figureFileSmall=abTVpYdnrbZn16DMbtV+TA==, figureFileBig=Hwa/XvMVV9s/2xFPION93w==, tableContent=null), ArticleFig(id=1254506252898337389, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图1, caption=南极罗斯海ANT32-RB16C、其他岩芯和WDC冰芯[18]位置及区域环流

1. ANT32-JB06岩芯[8];2.ANT32-JB04岩芯[19];3.GC1606岩芯[20];AASW.南极表层水;AABW.南极底层水;CDW.绕极深层水;MCDW.变性绕极深 层水;DSW.高密度陆架重水;ISW.冰架水

, figureFileSmall=abTVpYdnrbZn16DMbtV+TA==, figureFileBig=Hwa/XvMVV9s/2xFPION93w==, tableContent=null), ArticleFig(id=1254506253242270321, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Fig. 2, caption= 210Pbex profile in sediment of Core ANT32-RB16C, figureFileSmall=+8Of3XEMqMXH7CGvxPQ9pg==, figureFileBig=d4LFzF1ltosc5aud7KW7dA==, tableContent=null), ArticleFig(id=1254506253544260214, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图2, caption=ANT32-RB16C沉积柱状样210Pbex垂直剖面, figureFileSmall=+8Of3XEMqMXH7CGvxPQ9pg==, figureFileBig=d4LFzF1ltosc5aud7KW7dA==, tableContent=null), ArticleFig(id=1254506253749781113, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Fig. 3, caption=Age-depth models of Core ANT32-RB16C based on Bacon program, figureFileSmall=3jdY37UPXmpQfBCvx3EJqA==, figureFileBig=jqjLx0IEU9DFEC4Fzq/tfA==, tableContent=null), ArticleFig(id=1254506253921747580, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图3, caption=ANT32-RB16C沉积柱状样基于Bacon程序的年龄深度模型, figureFileSmall=3jdY37UPXmpQfBCvx3EJqA==, figureFileBig=jqjLx0IEU9DFEC4Fzq/tfA==, tableContent=null), ArticleFig(id=1254506254211154561, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Fig. 4, caption=Grain size variation of Core ANT32-RB16C and WDC δ 18O record[18]

ACR. Antarctica Cold Reversal; Ⅰ. oscillation period of sedimentary records in the Last Deglaciation; Ⅱ. oscillation period of sedimentary records in Late Holocene

, figureFileSmall=vFE3DvCYREno2MunlS+PIg==, figureFileBig=BYVxAQsu9zH/tflh+p15Ig==, tableContent=null), ArticleFig(id=1254506254525727364, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图4, caption=ANT32-RB16C沉积柱状样岩性、粒度组分、TOC变化和WDC δ 18O记录[18]

ACR.南极冷反转事件;Ⅰ.末次冰消期沉积记录振荡时期(粒度组分出现明显变化,而有机碳及生物标志物指标均无明显变化);Ⅱ.晚全新世沉 积记录振荡时期(有机碳及生物标志物指标均出现明显变化,而粒度组分无明显变化)

, figureFileSmall=vFE3DvCYREno2MunlS+PIg==, figureFileBig=BYVxAQsu9zH/tflh+p15Ig==, tableContent=null), ArticleFig(id=1254506254752219782, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Fig. 5, caption=The n-alkanes, pristine and phytane parameters of Core ANT32-RB16C

ACR. Antarctica Cold Reversal; Ⅰ. oscillation period of sedimentary records in Last Deglaciation; Ⅱ. oscillation period of sedimentary records in Late Holocene

, figureFileSmall=JqGkLPW46Egpk2khUyDjtQ==, figureFileBig=TshE8ffhlkd+T9pm83xRMw==, tableContent=null), ArticleFig(id=1254506254878048906, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图5, caption=ANT32-RB16C柱状沉积物正构烷烃及姥鲛烷(Pr)、植烷(Ph)指标

ACR.南极冷反转事件;Ⅰ.末次冰消期沉积记录振荡时期;Ⅱ.晚全新世沉积记录振荡时期

, figureFileSmall=JqGkLPW46Egpk2khUyDjtQ==, figureFileBig=TshE8ffhlkd+T9pm83xRMw==, tableContent=null), ArticleFig(id=1254506255008072335, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Fig. 6, caption=The tricyclic terpane constitute and other terpane parameters of Core ANT32-RB16C

ACR. Antarctica Cold Reversal; Ⅰ. oscillation period of sedimentary records in Last Deglaciation; Ⅱ. oscillation period of sedimentary records in Late Holocene

, figureFileSmall=biqQq6+bfrOdPrZVUDK1Vw==, figureFileBig=KCRHmGbWcjyzTZBE+LFsrw==, tableContent=null), ArticleFig(id=1254506255096152723, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=图6, caption=ANT32-RB16C柱状沉积物三环萜烷相对组成及其他萜烷指标

ACR.南极冷反转事件;Ⅰ.末次冰消期沉积记录振荡时期;Ⅱ.晚全新世沉积记录振荡时期

, figureFileSmall=biqQq6+bfrOdPrZVUDK1Vw==, figureFileBig=KCRHmGbWcjyzTZBE+LFsrw==, tableContent=null), ArticleFig(id=1254506255192621717, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=EN, label=Table 1, caption=

AMS14C data and calendar age of Core ANT32-RB16C

, figureFileSmall=null, figureFileBig=null, tableContent=
层位/cm 测试材料 测量值/a BP (碳库年龄+ 老碳年龄)/a 日历年龄 /a BP
0~2 有机碳 6 000±30 5 008
4~6 有机碳 5 150±30 5 008 521
6~8 有机碳 5 440±30 5 008 778
42~44 有机碳 9 620±40 5 008
44~46 有机碳 8 960±30 5 008 4 627
72~74 有机碳 16 400±50 5 008 13 988
74~76 有机碳 17 520±50 5 008 15 143
136~138 有机碳 25 610±100 5 008
138~140 有机碳 24 910±90 5 008 20 385
154~156 有机碳 26 390±110 5 008
204~206 有机碳 25 040±100 5 008 23 755
206~208 有机碳 27 410±130 5 008
230~232 有机碳 25 420±100 5 008 24 762
), ArticleFig(id=1254506255352005273, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1246840127062954692, language=CN, label=表1, caption=

ANT32-RB16C沉积柱状样AMS14C测年数据及日历年龄

, figureFileSmall=null, figureFileBig=null, tableContent=
层位/cm 测试材料 测量值/a BP (碳库年龄+ 老碳年龄)/a 日历年龄 /a BP
0~2 有机碳 6 000±30 5 008
4~6 有机碳 5 150±30 5 008 521
6~8 有机碳 5 440±30 5 008 778
42~44 有机碳 9 620±40 5 008
44~46 有机碳 8 960±30 5 008 4 627
72~74 有机碳 16 400±50 5 008 13 988
74~76 有机碳 17 520±50 5 008 15 143
136~138 有机碳 25 610±100 5 008
138~140 有机碳 24 910±90 5 008 20 385
154~156 有机碳 26 390±110 5 008
204~206 有机碳 25 040±100 5 008 23 755
206~208 有机碳 27 410±130 5 008
230~232 有机碳 25 420±100 5 008 24 762
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罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析
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宋乐慧 1 , 韩喜彬 2, 3, * , 李家彪 2, 3 , 高抒 1 , 刘庚 2, 3 , 龙盼盼 2, 3
海洋学报 | 极地研究成果专栏 2019,41(9): 52-64
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海洋学报 | 极地研究成果专栏 2019, 41(9): 52-64
罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析
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宋乐慧1 , 韩喜彬2, 3, * , 李家彪2, 3, 高抒1, 刘庚2, 3, 龙盼盼2, 3
作者信息
  • 1 南京大学 海岸与海岛开发教育部重点实验室,江苏 南京 210023
  • 2 国家海洋局海底科学重点实验室,浙江 杭州 310012
  • 3 自然资源部第二海洋研究所,浙江 杭州 310012
  • 宋乐慧(1994—),女,山东省枣庄市人,主要从事海洋沉积环境研究。E-mail:

通讯作者:

*韩喜彬,男,博士,副研究员,主要从事海洋地质研究工作。E-mail:
Western Ross Sea sedimentary environment reconstruction since the Last Glacial Maximum based on organic carbon and biomarker analyses
Lehui Song1 , Xibin Han2, 3, * , Jiabiao Li2, 3, Shu Gao1, Geng Liu2, 3, Panpan Long2, 3
Affiliations
  • 1 Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210023, China
  • 2 Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
  • 3 Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
出版时间: 2019-09-25 doi: 10.3969/j.issn.0253-4193.2019.09.005
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本文研究采自位于南极罗斯海西部的ANT32-RB16C柱状沉积物,根据粒度、有机碳和生物标志化合物数据探讨末次冰盛期(24.8 ~20 ka BP)以来该地区有机质来源及沉积环境特征。该柱状样记录了冰架下沉积、冰架前沉积、开阔海域沉积的沉积环境。指示有机质来源的生物标志化合物指标表明该柱状样中所含有机质主要为浮游植物、细菌等海源输入,同时伴有少量陆源物质混合输入。末次冰盛期,由于冰架的影响有机质含量较低,环流影响使得有机质受低等浮游藻类生物等海源影响较大。末次冰消期(20~11.7 ka BP),罗斯冰架消退,冰川溶解释放的有机质在此沉积,使得陆源有机质输入增多,有机质含量升高。进入全新世,有机质含量较末次冰盛期和末次冰消期明显升高,海源输入比例增大,同时细菌等原核生物增多,导致短链正构烷烃降解程度较大。研究区的氧化还原环境主要受冰架与海冰限制作用的影响,与有机质含量和高氧的南极底层水关系不大。总体来说,从末次冰盛期到末次冰消期,研究区沉积环境受罗斯冰架进退影响,全新世以来受气候变化影响。

有机质  /  生物标志化合物  /  沉积环境  /  末次冰盛期  /  罗斯海

Analyses of grain size, organic carbon and biomarker have been carried out for the core ANT32-RB16C, in order to identify the source of organic matter and reconstruct the sedimentary environment since the Last Glacial Maximum in the western Ross Sea. From the bottom to the top within the core, sub-ice-shelf, pre-ice-shelf and open-marine sedimentary environments can be differentiated. The combined parameters of biomarker indicate that organic matter is mainly a mixed input of terrigenous and marine origin. During the Last Glacial Maximum (24.8–20 ka BP), under the influence of ice sheet and the current condition, the organic matter content was low and its source was associated mainly with a marine origin, with a relatively low plankton productivity. During the Last Deglaciation (20–11.7 ka BP), the organic matter released by the dissolution of the glaciers in the retreat process of the Ross Ice Shelf, caused the increase of terrestrial organic matter. During the Holocene, the content of organic matter increased significantly, together with the proportion of marine origin input. The number of prokaryotes such as bacteria increased, resulting in a greater degree of degradation of short-chain n-alkanes. The redox condition in the study area is mainly affected by the ice shelf and sea ice limitation, and has little relationship with the organic matter content and the high-oxygen Antarctic Bottom Water. In general, from the Last Glacial Maximum to the Last Deglaciation, the study area sedimentary environment was affected by the Ross Ice Shelf, and by the climate since the Holocene.

organic matter  /  biomarker  /  sedimentary environment  /  Last Glacial Maximum  /  Ross Sea
宋乐慧, 韩喜彬, 李家彪, 高抒, 刘庚, 龙盼盼. 罗斯海西部末次冰盛期以来沉积环境重建:有机碳与生物标志化合物分析. 海洋学报, 2019 , 41 (9) : 52 -64 . DOI: 10.3969/j.issn.0253-4193.2019.09.005
Lehui Song, Xibin Han, Jiabiao Li, Shu Gao, Geng Liu, Panpan Long. Western Ross Sea sedimentary environment reconstruction since the Last Glacial Maximum based on organic carbon and biomarker analyses[J]. Haiyang Xuebao, 2019 , 41 (9) : 52 -64 . DOI: 10.3969/j.issn.0253-4193.2019.09.005
罗斯海是南大洋第二大边缘海,区域内罗斯冰架是世界上最大的冰架,其进退过程影响着南极底层水的形成[1-2],进而对南极地区乃至全球气候产生影响。末次冰盛期(Last Glacial Maximum,LGM)以来,罗斯冰架随着末次冰消期、全新世大暖期等一系列气候事件发生了不同程度的进退,在此过程中,大约25%的南极冰盖(包括来自西南极和东南极冰盖)排入罗斯海[3],使该区域成为监测过去冰盖活动的重要焦点[4-5]。从沉积记录中可以提取沉积环境信息,从而推断罗斯冰架的进退过程,Licht等[6]根据沉积物中不同沉积岩相代表的沉积环境发现LGM期间冰架接地线在罗斯海西部并未超过74°S;Salvi等[7]利用黏土矿物研究Pennell海槽在末次冰期和冰后期沉积环境和过程的差异,认为LGM期间罗斯冰架只在海槽侧翼接地;黄梦雪等[8]对罗斯海西部岩芯进行粒度及其端元模拟分析重建了末次冰期以来罗斯冰架的消退过程,表明LGM期间罗斯冰架在ANT31-JB06岩芯(74°28′22″S,173°54′24″E)位置没有触底,且在21 ka BP开始后退。罗斯冰架受不同地区沉积环境影响表现出复杂的进退变化,需要更多的沉积记录来完整地了解罗斯冰架演变过程。沉积物中的有机质作为沉积记录的重要载体之一,指示沉积物来源,反映环流特征和沉积环境[9-10]。探讨LGM以来罗斯海地区沉积物中有机质的来源,分析该地区的沉积环境变化,可为揭示罗斯冰架进退过程提供重要参考,对南大洋气候和演变历史研究具有重要意义。
生物标志化合物也叫分子化石,是岩石和沉积物等地质体中来源于生物有机体的有机化合物,在有机质演化过程中,这些分子经历了成岩、成土等地质作用形成基本保存原始生物组分的稳定结构,记录了原始生物母质及其环境的相关信息[11]。由于生物标志化合物与其母源有一定的结构联系和相关性,从而可以用于指示环境和物质来源[12-13]。目前,对于南极地区生物标志化合物的研究日益广泛,如Matsumoto等[14]通过研究麦克默多干谷地区土壤样品中的烃类,发现长链正构烷烃主要来源于苔藓和维管植物残体;汪建君等[15]利用粪便甾醇和脂肪醇研究南极阿德雷岛2 400年以来企鹅数量和不同植被丰度的变化,恢复南极生态发展历史;于培松等[16]利用甲藻甾醇、菜籽甾醇和长链烯酮作为重建浮游植物(甲藻、硅藻和颗石藻)的指标,对普里兹湾浮游植物群落结构的变化进行研究;Wisnieski等[17]将乔治王岛地区沉积物中正链烷醇和甾醇用于指示有机质来源。然而目前尚缺乏借助生物标志化合物对罗斯海沉积物中有机质来源以及沉积环境的研究。本研究采用南极罗斯海西部的柱状沉积物样品,运用粒度,有机碳、氮,碳、氮同位素和生物标志化合物研究LGM以来该地区有机质的来源及其变化特征,重建罗斯海西部LGM以来的沉积环境。
罗斯海是南大洋延伸至南极洲形成的大型的深水海湾。如图1所示,罗斯海两侧是维多利亚地和爱德华七世地,南部大部分地区被世界上最大的冰架——罗斯冰架所覆盖。罗斯冰架面积约45 000 km2,中部和东部主要由西南极冰盖(West Antarctica Ice Sheet, WAIS)供给,西部主要由东南极冰盖(East Antarctica Ice Sheet, EAIS)供给[5]。罗斯海陆架平均水深530 m,存在早期罗斯冰架扩张产生的一系列南北走向的浅滩和海槽[19]。罗斯海地区营养物质充足,生物多样性丰富,拥有庞大的浮游植物群落,以及企鹅、鲸鱼、海豹、南极磷虾等大型生物[21]
罗斯海区域内的主要水团有南极表层水(Antarctic Surface Water,AASW)、南极底层水(Antarctic Bottom Water,AABW)、绕极深层水(Circumpolar Deep Water,CDW)、变性绕极深层水(Modified Circumpolar Deep Water,MCDW)、高密度陆架重水(Dense Shelf Water,DSW)、冰架水(Ice Shelf Water,ISW)。AASW是位于水体表层的低盐冰融水,沿着陆架边缘向西流,另一部分沿着东海岸经过科尔贝克角(Cape Colbeck)向南流,DSW是表层水结冰析出的低温高盐水,沿陆坡下沉,由于科氏力的影响左偏加入AABW[22-23],ISW是在冰架穴中产生相对低温低盐的水体,位于DSW之上[24],CDW是南大洋分布最广的水团,在罗斯海地区上涌与其他水团混合转变成高温低盐的MCDW流入陆架[25-26]
本文的研究材料是中国第32次南极科学考察于罗斯海西北部陆架上ANT32-RB16C站位所取柱状样,站位坐标为74°31′06″S,175°07′15″E,水深471 m(图1)。该柱状样总长232 cm,本研究对该柱状样沉积物分别进行了AMS14C测年,210Pb测年,粒度分析,有机碳、氮及碳、氮同位素测试和生物标志化合物测试分析。
210Pb测年:实验依据中华人民共和国国家标准《海洋沉积物中放射性核素的测定γ能谱法(GB/T 30738–2014)》[27]进行,取10 g左右的干沉积物研磨,过100目孔筛去除植物根茎,然后装入样品管中密封,放置20 d。然后使用ORTEC高纯锗井型探头(GWL-120-15N)进行放射性同位素测量。每个样品测量时间一般为1~3 d,总210Pb比活度为46.5 keV(210Pb)能量处的峰面积,本底210Pb比活度为351 keV(214Pb,226Ra的子体)能量处的峰面积计算,过剩210Pb的比活度为二者之差。实验在自然资源部第二海洋研究所海底科学实验室完成,测试仪器为美国ORTEC公司生产的GWL-120-15N型高纯锗γ谱仪,该仪器的主要指标为:对60Co在1.33 MeV处的能量分辨率(FWHM)≤2.4 keV;对57Co在122 keV处的能量分辨率(FWHM)≤1.4 keV。按1 cm间隔取样共分析10个样品。
AMS14C测年:以沉积柱状样13个层位中的全碳样品为材料,在美国Beta实验室完成AMS14C测试分析,年代控制点之间和控制点之外采用Bacon2.3.3程序校正拟合来建立年代框架。Bacon程序是一种运用贝叶斯统计构建年龄–深度模型的方法[28]。将14C年龄数据和先验信息相结合,通过马尔可夫链蒙特卡罗(Markov Chain Monte Carlo,MCMC)迭代估算积累速率,从而构建年龄–深度模型。具体操作在R软件界面下进行,校正过程中,日历年校正模式选择海洋模式(cc=2)Marine13校正曲线[29],将步长设定为5 cm,共计算47个长度单位。
实验依据中华人民共和国国家标准《海洋调查规范 第8部分:海洋地质地球物理调查(GB12763.8–2007)》[30]进行,取0.2 g冷冻干燥后的样品,分别加入30%的H2O2溶液和0.25 mol/L的盐酸去除有机质和碳酸盐,直至没有气泡产生,再加入20 mL 1 mol/L的Na2CO3溶液在85℃的水浴锅中连续加热4 h,去除生物硅。将处理过的样品用去离子水洗至中性后加入8 mL 0.5 mol/L的(NaPO3)6溶液超声波搅拌,使样品充分分散,采用自然资源部第二海洋研究所Malvern 2000型激光粒度分析仪(测量范围为0.02~2 000 μm)进行分析测试,重复性测试偏差小于2%。按2 cm间隔取样共分析116个样品。
实验依据中华人民共和国国家标准《地质样品有机地球化学分析方法 第2部分:有机质稳定碳同位素测定 同位素质谱法(GB/T 18340.2–2010)》[31]进行,称取部分研磨后的沉积物样品,加入1 mol/L的盐酸至过量,反应24 h去除碳酸盐。用去离子水洗酸至中性后烘干。准确称取2.5~3 mg的样品,用锡杯包样,用元素分析仪–稳定同位素质谱仪联机(Flash EA 1112 HT- Delta V Advantages,Thermo公司)测定沉积物中TOC值,测试精度为0.2‰,实验在自然资源部第二海洋研究所海底科学实验室完成。1 cm间隔取样共分析232个样品。
实验依据中华人民共和国国家标准《气相色谱-质谱法测定沉淀物和原油中生物标志物(GB/T 18606–2001)》[32]进行,将样品冷冻干燥、粉碎至80目岩样进行抽提78 h,用石油醚沉淀沥青质,族组分分离用硅胶、氧化铝色层柱分离,正已烷、二氯甲烷和氯仿/乙醇混合溶剂洗脱饱和烃、芳烃和非烃。样品经前处理后由气相色谱-质谱仪(Agilent 7890A GC/5975C MSD)进行测试分析,由中国石化股份胜利油田分公司地质科学研究院石油地质测试中心完成。色谱分析条件为色谱柱:DB5-MS 50 m×0.25 mm×0.25 μm;气化室温度:300℃,传输管线温度:300℃;升温程序:柱始温80℃,升温速率4℃/min,柱终温300℃,恒温时30 min;分流比10:1;载气:氦气(99.999%);流速:1 mL/min;采集方式:选择离子检测(SIM);扫描速率:1循环/s;离子源温度:250℃;离化方式;电子轰击(EI)。2 cm间隔取样共分析116个样品。
ANT32-RB16C柱状沉积物岩性较均一,整体以砂质粉砂为主,0~6 cm,沉积物颜色为黄绿色,含有硅藻残体;6~66 cm,颜色为灰绿色,质地较软,含有砂状黏土硬核;66~133 cm,颜色为黑灰色,质地较软,个别层位含有砾石;133~232 cm,颜色为黑灰色,结构较为致密,砾石较少。
根据210Pb测年结果所得ANT32-RB16C沉积物中210Pbex比活度与柱样深度的分布规律(图2)可以发现,表层至4 cm深度210Pbex比活度随柱样深度呈指数衰减,4 cm以下为本底值范围内的波动,因此认为表层为现代沉积,即岩芯顶部年龄为0 a BP。
AMS14C测年按照沉积柱状样岩性变化和XRF扫描数据选择了13个层位的全碳样品为材料,结果如表1所示。其中0~2 cm、42~44 cm、136~138 cm、154~156 cm、206~208 cm有年龄倒转现象,可能是由老碳污染引起。将剩余8个层位的有效年龄控制点数经Bacon 2.3.3程序校正拟合,得到岩芯顶部年龄为5 008 a BP、底部年龄为29 712 a BP的年龄模式(图3)。图中蓝色点为年龄控制点,灰色虚线内是95%置信区间内的年代值,颜色深浅表示概率大小,红色虚线为加权平均年龄,即为本文所采用的年代值。图3a图3c依次为邻近点迭代次数、沉积速率γ分布和R记忆β分布。迭代次数超过1 000表示年代可靠,本文年代迭代次数超过4 000,因此年代计算是可靠的。但有机碳中的14C年龄受碳库年龄和老碳年龄的影响而偏老,210Pb测年结果表明表层为现代沉积,岩芯顶部年龄为0 a BP,因此可以把碳库年龄与老碳年龄之和设为5 008 a,这与前人研究结果中的碳库年龄和老碳年龄之和接近[5, 19, 33],由此可得岩芯底部年龄为24 762 a BP。
图4所示,ANT32-RB16C沉积物中砂含量在24.8~20 ka BP期间高于平均值15.46%,无明显升高或降低趋势,但在23.5~22.3 ka BP期间有小幅降低;20~11.7 ka BP期间含量较高,在平均值以上,波动较大且有降低的趋势,20~18.7 ka BP期间含量升高达到峰值,振荡Ⅰ(18.5~17 ka BP)期间有较大波动,在南极冷反转(Antarctica Cold Reversal,ACR)(14~12 ka BP)事件期间有小幅升高;11.7~0 ka BP期间持续降低。而粉砂含量变化与砂相反,在24.8~20 ka BP期间较低,23.5~22.3 ka BP期间相应升高,其余期间基本在平均值57.46%以下;20~11.7 ka BP期间,含量仍较低,在平均值以下,但有增高的趋势,ACR期间有小幅降低;11.7~0 ka BP期间,粉砂含量明显增高。黏土含量变化相对较小,基本稳定在20%左右,无明显升高或降低的趋势。
粒径大于250 μm的粗颗粒含量变化特征与砂的含量变化类似,在24.8~20 ka BP期间无明显升高或降低趋势;20~11.7 ka BP期间含量在高值范围内波动,18.7 ka BP开始有降低的趋势,振荡Ⅰ(18.5~17 ka BP)期间快速降低,在ACR(14~12 ka BP)事件期间有小幅升高;11.7~0 ka BP期间持续降低。
分选系数也呈现与砂的含量相似的变化,24.8~20 ka BP期间,除23.5~22.3 ka BP期间,其余时期都大于平均值2.54,分选性较差;20~11.7 ka BP期间,分选系数仍大于平均值,20 ka BP以后明显变大,且波动较大但有减小的趋势,分选变好,振荡Ⅰ期间波动较大,而在ACR期间小幅增大,分选变差;在11.7~0 ka BP期间,分选系数持续减小,且无较大波动,分选性较好。
沉积物中TOC含量变化范围为0.40%~1.56%,平均值为0.73%,从岩芯底层到表层整体上呈现先在低值区波动后大幅升高的变化趋势,与南极冰芯WDC中δ 18O[18]记录变化趋势相似。在24.8~20 ka BP期间,TOC含量较低,无明显升高或降低的趋势,20 ka BP后有缓慢升高的趋势,11.7 ka BP后开始大幅增加。但在18.5~17 ka BP、4.2~1 ka BP时间段内较相邻时期有小幅升高,特别是4.2~1 ka BP期间TOC含量大幅升高。有机碳沉积通量(计算时干密度取2.55 g/cm3 [33])的变化则与沉积速率的变化基本一致,24.8~20 ka BP期间处于高值,随后开始降低,ACR期间(14~12 ka BP)降至最低,但在4.2~1 ka BP期间出现明显的增高。
正构烷烃的碳数分布特征及主峰碳(Cmax)对于指示其来源具有重要意义。一般认为,碳链较短的正构烷烃(nC13–nC21)主要来源于海洋细菌藻类等低等生物,且以C17、C18和C19为主峰碳;碳链较长的正构烷烃(nC23–nC36)主要由陆源高等植物的输入,且以C27、C29和C31为主峰碳,具有明显的奇偶优势;而双峰群则是海陆生物的混合来源[34-36]。总体上ANT32-RB16C沉积物中饱和烃的碳数分布范围为C12–C36,主峰碳为C16、C19、C18,表明沉积物中有机质主要来源于海洋藻类浮游生物和细菌。从图5中也可以看出,指示海源的短链正构烷烃 $\sum$ C15–21基本上占总正构烷烃含量的50%以上,而指示陆源的长链正构烷烃 $\sum $ C25-35占比不到40%,沉积物中的有机质以海洋藻类和细菌为主。沉积物中虽含有较少的陆源有机质,但在不同时期陆源有机质的含量有所变化。长链正构烷烃含量与短链正构烷烃含量之比 $\sum $ C25–35/ $\sum $ C15–21可以反映陆源有机质相对于海源输入的情况[37],比值越大代表陆源有机质输入越高。平均链长ACL(Average Chain Length)=( $\sum$ [C i i)/( $\sum $ C i ),其中碳数i=12~36,指一定碳数范围内的正构烷烃含量分布集中的链长碳数,也可用于指示陆源有机质相对于海源有机质输入的情况[38]。ACL越大表示陆源有机质输入相对越多,反之表示陆源有机质输入相对越少,而海源输入相对越多。如图5所示, $\sum$ C25–35/ $\sum$ C15–21和ACL曲线变化一致,在24.8~20 ka BP期间除个别层位突然增大外无明显增大或减小趋势;20~11.7 ka BP期间有所增大,陆源输入比例增加,但在ACR时期又有所减小,随后处于低值,直至4.2~1 ka BP期间突然增大,陆源有机质增多。
ANT32-RB16C沉积物中姥鲛烷/植烷(Pr/Ph)值在24.8~20 ka BP期间虽有小范围周期性波动,但都小于1;在20~0 ka BP期间,Pr/Ph值较上一时期有所增大,在0.8~1.6范围内变化,波动较大。ACR时期有所降低。
萜烷实际上是一种环状的异戊二烯类化合物,其碳骨架是由两个或多个异戊二烯结构单元以头尾相连的形式组成的,其分布特征也可指示有机质来源。三环萜烷类主要来源于原生生物和藻类[39],且稳定性较高不易被微生物降解。如图6所示,ANT32-RB16C沉积物三环萜烷碳数分布范围为C19–C29,其中C23占优势,缺少C27,C21<C23>C24的分布特征(图6),表明沉积物中三环萜烷以菌藻低等生物为主[40-41]。常见的五环三萜烷是由6个异戊二烯结构单元组成的环烷烃,可分为藿烷系列和非藿烷系列两类。五环三萜类以17α,21β–C33–三升藿烷(22S)和17α,21β–C32–二升藿烷(22S)丰度最高。非霍烷系列常见的有伽马蜡烷、奥利烷、羽扇烷等,伽马蜡烷主要来源于原生生物和光合作用细菌,奥利烷则为高等植物成因[42]。ANT32-RB16C沉积物中含有一定的伽马蜡烷和奥利烷,伽马蜡烷/C30霍烷比值波动较大,24.8~11.7 ka BP期间比值较小,沉积物细菌等原核生物的有机质贡献较小,振荡Ⅰ(18.5~17 ka BP )期间波动较大,11.7~0 ka BP期间比值变大,演化程度较高,同时细菌等原核生物的有机质贡献增多,但在振荡Ⅱ(4.2~1 ka BP)期间有较大波动。奥利烷/C30霍烷变化范围在0.03~0.07,比值较小,说明有一定的陆源物质存在。因霍烷为高等植物成因,三环萜烷/霍烷比值可以判断有机质的来源,比值越大表示海源输入越多。ANT32-RB16C沉积物中三环萜烷/霍烷比值在24.8~20 ka BP期间较小,20~11.7 ka BP期间有小幅度的减小,11.7~0 ka BP期间呈现明显增大的趋势,指示海源有机质输入明显增多。
罗斯冰架在LGM时期处于扩张阶段,冰架接地线可到达陆架边缘[4, 43-44],而在西罗斯海JOIDES海槽冰架接地线未达到陆架边缘[44],其冰架接地线最北位置位于74°S以南[4, 6]。前人[6, 19, 43, 45]通过研究罗斯海西部多个站位的岩芯样品得到典型的沉积序列,自下而上分别为冰盖下混杂沉积、冰海沉积和开放海洋环境沉积,其显著的变化特征是硅藻丰度的增加,沉积物由致密变松散,有机碳含量增多;冰架下沉积时由低能水环境从底部碎屑层带来的沉积物,陆源物质较少;冰架消退,处于冰架前缘沉积时粗颗粒增多,分选变差。24.8~20 ka BP期间,位于JOIDES海槽的ANT32-RB16C岩芯具有连续的沉积记录,粉砂和黏土含量较高,砾石较少,分选较好,且有机质各指标有所波动但均无明显升高或降低趋势。这与Domack等[45]得到的典型序列中粒径较大、分选较好的冰架下沉积层特征类似,而不同于由于触底扰动再沉积形成的分选差、有机质含量低且均质的冰盖下混合沉积层。因此推测此阶段为冰架下沉积,罗斯冰架已经增长至该岩芯所在位置,且在该位置没有触底。所以,研究区冰架接地线最北位置应在该站位(74.5°S)以南,黄梦雪等[8]对同样位于JOIDES北部海槽南侧边缘的JB06岩芯(74°28′22″S,173°54′24″E)(图1中1)研究也表明罗斯冰架在27~21 ka BP扩张到该岩芯所在位置,但并没有触底。受到地形和环流的共同影响,冰架接地线达到JOIDES海槽中部台地后未能扩张到北部海槽[19]。由于冰架覆盖的影响,这一阶段研究区环流较弱,但罗斯冰架扩张过程中,冰流携带的物质在此沉积,因此这一时期沉积速率较高;同时结冰析盐过程中形成低温高盐的DSW可深达陆架底层[46],垂向对流促进了上下水体交换,导致沉积物颗粒相对较粗。
ANT32-RB16C沉积物中粒度指标在20 ka BP前后出现明显变化,20~11.7 ka BP期间,砾石增多,大于250 μm的粗颗粒沉积物明显增多,砂的含量明显升高达到峰值,粉砂含量降低,分选明显变差,有机质含量开始增多,这与JB04岩芯(75°18′04″S,172°22′21″E)(图1中2)中所记录的冰架前缘沉积地层特征类似[19],因此推测此时沉积环境为冰架前沉积,罗斯冰架在20 ka BP开始退离ANT32-RB16C所在位置。南极冰芯WDC中记录的δ 18O在21 ka BP前后开始升高[18],气候变暖进入末次冰消期,罗斯冰架消退首先发生在西部JOIDES海槽[445],在21 ka BP前后可能已退至74°S以南[45]。黄梦雪等[8]认为罗斯冰架在21 ka BP已经退离JB06岩芯所在位置。ANT32-RB16C相比JB06位置更靠近罗斯冰架,因此退离时间较晚。罗斯冰架消退过程中,冰山溶解释放冰筏碎屑物并在此沉积,导致粗颗粒物质增多,分选变差,沉积速率较高。振荡Ⅰ(18.5~17 ka BP )期间,砂的含量和大于250 μm的粗颗粒沉积物明显减少,对应南极冰芯WDC在同一时期的δ 18O记录较相邻时期偏负[18],指示这期间温度短暂降低,罗斯冰架消退减缓甚至停滞,形成低能的水动力环境。而ACR期间(14~12 ka BP),ANT32-RB16C沉积物中砂的含量及大于250 μm的粗颗粒物质有所升高,显示较强的水动力环境,对应南极冰芯WDC δ 18O记录ACR冷事件[18],罗斯冰架消退减缓,海冰面积增加,结冰过程中析出的DSW下沉促进了上下水体交换,也使得水动力条件增强。
进入全新世,南极冰芯WDC δ 18O记录指示气候变暖[18],ANT32-RB16C沉积物颜色由黑灰色过渡到灰绿色,趋向于砂质泥,砂的含量呈现明显减少的趋势,而粉砂的含量升高,分选性趋于良好,水动力条件减弱,推测此阶段为开阔海域沉积,这与Domack等[45]得出的JOIDES海槽在10~8 ka BP由冰架沉积环境过渡到开阔海域环境的结论基本对应。全新世以来,气候变暖罗斯冰架持续消退,尽管罗斯冰架接地线在7 ka BP之后才基本消退到现在的位置[47],但由于地理位置及地形的因素,研究区的沉积环境受罗斯冰架的影响较小。
总体来说,生物标志物正构烷烃和萜烷指标指示ANT32-RB16C岩芯中的有机质主要为浮游植物、细菌等海源,同时伴有少量陆源混合输入,在不同时期陆源输入比例有所不同。
24.8~20 ka BP期间,ANT32-RB16C岩芯处于冰架下,由于冰架的影响有机质输入较少,因此TOC处于低值,有机质含量较低。 $\sum $ C25–35/ $\sum $ C15–21、ACL和三环萜烷/霍烷都指示有机质中陆源输入较少,有机质受低等藻类生物等海源影响较大。位于罗斯岛南部更靠近陆地的GC1606岩芯(76°46′14″S,166°52′36″E)(图1中3)中也记录冰架下沉积时陆源沉积物较少[20],冰架覆盖隔绝陆源碎屑物质的输入,DSW下沉促进了上下水体交换,因此有机质主要为海洋来源。
20~11.7 ka BP期间,ANT32-RB16C岩芯位于冰架前缘,TOC含量在20 ka BP开始呈现升高的趋势,可能由于罗斯冰架消退冰川溶解释放的有机质在此沉积。 $\sum $ C25–35/ $\sum $ C15–21和ACL有所增大指示陆源有机质输入增多,这些陆源有机质来源于罗斯冰架消退冰山溶解释放的冰筏碎屑物。ACR期间(14~12 ka BP), $\sum $ C25–35/ $\sum $ C15–21和ACL小幅降低,指示陆源有机质输入减少,这是罗斯冰架消退减缓导致其释放的有机质减少所致。
进入全新世,有机质含量呈现升高的趋势,这是由于气候变暖,且水动力条件较弱,有利于生物的生长和繁殖。 $\sum $ C15–21 $\sum $ C25–35结果指示海源有机质仍占主要部分, $\sum $ C25–35/ $\sum $ C15-21和ACL表现出逐渐增大的趋势,指示陆源有机质增多,这与三环萜烷/霍烷指示全新世以来海源有机质增多的结果相反。伽马蜡烷/C30霍烷比值在全新世以来增幅较大,说明细菌等原核生物增多。因此可以推测较易降解的短链正构烷烃受到细菌作用,降解程度增大[48],导致 $\sum $ C25–35/ $\sum $ C15–21和ACL增大,而萜烷相对稳定不易降解,三环萜烷/霍烷指示的全新世以来海源有机质增多的结果也与前人研究结果一致,全新世以来气候变暖使得硅藻等海洋生物增多。振荡Ⅱ(4.2~1 ka BP)期间,TOC含量大幅升高且波动较大,生物标志物指标均有较大波动, $\sum $ C25–35/ $\sum $ C15–21、ACL指示陆源有机质输入增多,有机碳沉积通量随沉积速率的增高而明显增大,但粒度指标无明显变化,说明研究区域水动力环境并未发生较大变化。而这一时期全球气候经历了3次强烈的气候突变事件,导致古代几大人类文明先后衰落。进入全新世,古老的农业文明相继兴起,人类从旧石器时代进入新时期时代[49]。大量古环境资料证明4.2 ka BP前后持续200年左右的寒冷干旱期,是历史时期以来最具影响力的一次小冰期[50],导致广域性古代文明衰落[51],包括两河流域美索不达米亚阿卡德文明、尼罗河流域古埃及文明、印度河流域古印度文明以及中国的良渚文化、龙山文化等新石器文化[52-54]。此后至1 ka BP,全球气候又经历了两次冷事件[55],地中海文明的灭亡、中国春秋战国时期的“百家争鸣”、欧洲民族大迁徙、罗马帝国的兴衰、中国南北朝时期的社会混乱、中世纪暖期欧洲人口的增加、中国唐宋时期的繁荣等人类文明的兴衰在各地区不断上演[56]。由此推测,4.2~1 ka BP期间有机碳和生物标志物指标的大幅波动与受气候突变影响的人类文明的兴衰更迭有关,由于采集狩猎、农业生产、土地开垦等人类活动产生并进入海洋环境中的有机质也处于大幅增减振荡频繁的状态,大量的陆源有机质随着大洋环流进入南极海域由南极表层水输送到研究区。同时南极冰芯WDC δ 18O记录指示4.2~1 ka BP期间南极气候较暖[18],使得海洋初级生产力增加,且高沉积速率提高了有机质的保存效率,有利于有机质的埋藏。因此振荡Ⅱ期间有机质含量较高且波动较大。
沉积环境的氧化还原性与生产力和环流状况密切相关[57-58],高生产力区域的沉积物中有机质降解耗氧增多容易造成缺氧的沉积环境,水体中的氧浓度及深部水体的流通性也会导致氧化还原性发生变化。生物标志物中姥鲛烷(Pr)和植烷(Ph)可作为判断沉积环境氧化还原性的指标,Pr/Ph<1时,表现植烷优势,指示还原–强还原环境;Pr/Ph>1时,表现姥鲛烷优势,指示弱氧化–氧化环境[11, 59]
ANT32-RB16C沉积物中Pr/Ph值为0.15~1.79,在24.8~20 ka BP期间虽有小范围周期性波动,但都小于1;在20~0 ka BP期间,Pr/Ph值较上一时期有所增大,在0.8~1.6范围内变化,波动较大,指示研究区由还原到氧化的沉积环境。但Pr/Ph值与TOC、烷烃总含量无相关性(R 2分别为0.065 9和0.003 8),因此,沉积物中有机质的保存和降解与氧化还原环境的关系不大。该站位位于陆架上,水深(471 m)较浅,低温高氧的南极底层水是由混合水体运移并下沉到深海中形成[1],对研究区沉积环境的氧化还原性影响不大。而研究区在24.8~21 ka BP期间呈现还原性的沉积环境可能是由于冰架覆盖导致该区域环流减弱,氧气补给不足而形成。20 ka BP冰架开始后退,该站位沉积环境不再受冰架覆盖的限制,氧化性增强,因而Pr/Ph值有所增大,基本上大于1。振荡Ⅰ(18.5~17 ka BP )期间,Pr/Ph值波动较大,可能是由于气候变化频繁,水动力环境波动较大所致。ACR(14~12 ka BP)期间,Pr/Ph值明显变小且低于1,由于这一时期气候变冷导致海冰面积增加、厚度增大[60],环流减弱使得沉积环境处于缺氧的状态。全新世以来气候变暖,研究区处于开阔海域环境,Pr/Ph值基本上大于1,指示氧化性的沉积环境。
(1)末次冰盛期(24.8~20 ka BP),罗斯冰架已经增长至ANT32-RB16C岩芯所在位置,但由于地形和环流影响在该位置没有触底,推测此阶段为冰架下沉积。末次冰消期(20~11.7 ka BP),ANT32-RB16C岩芯位于冰架前缘,罗斯冰架在20 ka BP退离ANT32-RB16C所在位置,沉积环境为冰架前沉积。全新世以来,为开阔海域沉积。
(2)ANT32-RB16C沉积物中的有机质主要为海源输入,同时伴有少量陆源混合输入,在不同时期陆源输入比例有所不同。LGM时期,由于冰架影响,有机质含量较低,环流影响使得有机质受低等浮游藻类生物等海源影响较大。末次冰消期(20~11.7 ka BP),罗斯冰架消退使得有机质含量升高,陆源有机质输入增多。进入全新世气候适宜期,有机质含量明显升高,海源输入比例增高,同时细菌等原核生物增多,导致短链正构烷烃降解程度较大。
(3)研究区的氧化还原环境主要受冰架与海冰限制作用的影响。LGM时期,受罗斯冰架覆盖的限制,研究区为还原性的沉积环境。末次冰消期以来,冰架消退,因而沉积环境氧化性增强。
  • “全球变化与海气相互作用”专项(GASI-GEOGE-03,GASI-04-01-02);国家自然科学基金(41476047,41476069);极地考察业务化与科研:国家南极观测监测网运维与管理;极地考察业务化与科研:南北极环境综合考察评估与管理。
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2019年第41卷第9期
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doi: 10.3969/j.issn.0253-4193.2019.09.005
  • 接收时间:2018-11-12
  • 首发时间:2026-04-03
  • 出版时间:2019-09-25
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  • 收稿日期:2018-11-12
  • 修回日期:2019-03-30
基金
“全球变化与海气相互作用”专项(GASI-GEOGE-03,GASI-04-01-02);国家自然科学基金(41476047,41476069);极地考察业务化与科研:国家南极观测监测网运维与管理;极地考察业务化与科研:南北极环境综合考察评估与管理。
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    1 南京大学 海岸与海岛开发教育部重点实验室,江苏 南京 210023
    2 国家海洋局海底科学重点实验室,浙江 杭州 310012
    3 自然资源部第二海洋研究所,浙江 杭州 310012

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*韩喜彬,男,博士,副研究员,主要从事海洋地质研究工作。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

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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