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Mineral chemistry and genetic significance of clinopyroxenes in the basement basalts from the southern Kyushu-Palau Ridge
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Zhenxuan Liu1, Quanshu Yan1, 2, 3, *, Yanguang Liu1, 2, 3, Gang Yang1, 2, Xuefa Shi1, 2, 3
Haiyang Xuebao | 2023, 45(6) : 75 - 92
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Haiyang Xuebao | 2023, 45(6): 75-92
• Article •
Mineral chemistry and genetic significance of clinopyroxenes in the basement basalts from the southern Kyushu-Palau Ridge
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Zhenxuan Liu1, Quanshu Yan1, 2, 3, *, Yanguang Liu1, 2, 3, Gang Yang1, 2, Xuefa Shi1, 2, 3
Affiliations
  • 1Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
  • 2Laboratory of Marine Geology, Laoshan Laboratory, Qingdao 266061, China
  • 3Key Laboratory of Deep Sea Mineral Resources Development, Shandong (preparatory), Qingdao 266061, China
Published: 2023-06-30 doi: 10.12284/hyxb2023071
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The Kyushu-Palau ridge (KPR) is an important part of the proto-Izu-Bonin-Mariana arc. The mineralogical and petrological studies of the arc basement rocks can provide significant insights for understanding the petrogenesis and magmatism characteristics of the early stage of intra-oceanic island arc evolution. In this paper, we performed petrographic and detailed mineral geochemical analyses including in situ major-trace elements of clinopyroxene (Cpx) phenocrysts and microcrystals from the basement basalts from the southern KPR. The results show that clinopyroxenes are mainly augites and diopside, which generally have similar chemical components for the phenocrysts and microcrystals. These clinopyroxenes are depleted in light rare earth elements with weak Eu negative anomalies. Most of the Cpx macrocrysts display zoning structures, which can be classified into basic and oscillatory zoning. The MgO, FeO, Al2O3, TiO2 and Mg# contents show complex high-low variations from the pyroxene core to the rim, indicating multi-period magma mixing and replenishment events. The crystallization temperature and pressure of Cpx phenocrysts are 1 151−1210℃ and 1.3×108−4.2×108 Pa, respectively. In addition, the water content of parent magma obtained by the inversion calculated from Cpx components is 0.8%−2.3% (wet weight). Conclusively, we suggested that the parent magma of the southern KPR lavas that formed within a typical intra-oceanic island-arc setting is a sub-alkaline island-arc tholeiite basaltic melt with high temperature, medium pressure, and high oxygen fugacity. The magma chambers were shallow in depth and there existed multi-period replenishment and mixing of primitive magma.

clinopyroxene  /  mineral chemistry  /  zoning structure  /  magmatic process  /  island-arc basalt  /  Kyushu-Palau Ridge
Zhenxuan Liu, Quanshu Yan, Yanguang Liu, Gang Yang, Xuefa Shi. Mineral chemistry and genetic significance of clinopyroxenes in the basement basalts from the southern Kyushu-Palau Ridge[J]. Haiyang Xuebao, 2023 , 45 (6) : 75 -92 . DOI: 10.12284/hyxb2023071
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Year 2023 volume 45 Issue 6
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Article Info
doi: 10.12284/hyxb2023071
  • Receive Date：2022-10-26
  • Online Date：2025-12-26
  • Published：2023-06-30
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History
  • Received：2022-10-26
  • Revised：2022-12-15
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Affiliations
    1Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
    2Laboratory of Marine Geology, Laoshan Laboratory, Qingdao 266061, China
    3Key Laboratory of Deep Sea Mineral Resources Development, Shandong (preparatory), Qingdao 266061, China
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表12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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