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  4. 中国科学院新生代地质与环境重点实验室
Mineral and geochemical characteristics for Jurassic volcanic rocks from ODP Site 801C in the Pigafetta Basin, Western Pacific Ocean: Implications for magmatic evolution at the oldest fast-spreading ridge

文献类型：期刊论文

作者Chen, Shuang-shuang1,3,4; Liu, Jia-qi1,3; Lee, Seung-Gu2
刊名JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
出版日期2019-10-01
卷号383页码:112-127
关键词Ocean Drilling Project Site 801C Pigafetta Basin Zoning texture Fast spreading ridge Within-plate alkaline volcanism
ISSN号0377-0273
DOI10.1016/j.jvolgeores.2017.09.024
英文摘要Despite their importance, no detailed mineral analyses have been conducted for volcanic rocks of Ocean Drilling Project Site 801C in the Pigafetta Basin, Western Pacific Ocean. From the eight volcanic sequences that comprise Site 801C, we performed comprehensive studies on the alkali basalts from sequence 1 (Upper Volcanic Group; UVG) and the tholeiitic basalts from sequences 3, 4, 6, and 8 (Lower Volcanic Group; LVG). To understand the magmatic evolution occurring at fast-spreading ridges, we studied the petrography, major and trace element compositions of minerals, mineral texture, and major and trace elements and Nd isotopic compositions for whole rocks. Alkali basalts from the UVG are characterized by enriched light rare earth elements (LREE) and large ion lithophile elements (LILE), relatively depleted heavy REE, and slightly low Nd isotopic ratios (epsilon Nd = 5.8-6.4), similar to the composition of ocean island basalts. Tholeiites from the LVG display significant depletions of LREE and LILE resembling the geochemistry of normal mid-ocean ridge basalts, and show much lower degrees of REE fractionation ((La/Yb)(N) = 0.50-0.74) and relatively high Nd isotopic ratios (epsilon Nd = 9.8-11.2). Plagiodase, alkali feldspar, clinopyroxene, and olivine in the UVG basalts display obvious normal zoning texture, indicating the slow ascent and magma evolution. The UVG alkali basalts were likely produced by the simple binary mixing of melts from a chemically and isotopically heterogeneous mantle. The comprehensive analyses suggest that the basaltic magma from Site 801C is the result of N-MORB fast-spreading ridge tholeiitic volcanism, which was followed after a certain interval (approximately 7 Ma) by within-plate alkaline volcanism from a plume influenced fertile mantle. The fast-spreading rate of the Pigafetta Basin basement was approximately 38-58 mm/y, and the within-plate alkaline volcanism was located similar to 400 km away from the active axis. (C) 2017 Published by Elsevier B.V.
WOS关键词TRACE-ELEMENT ; CHEMICAL CLASSIFICATION ; PARTITION-COEFFICIENTS ; GEOLOGICAL SAMPLES ; LIQUID EQUILIBRIA ; JAPAN SEA ; MANTLE ; CLINOPYROXENE ; BASALTS ; SR
资助项目National Natural Science Foundation of China[41476034] ; National Natural Science Foundation of China[41272369] ; National Natural Science Foundation of China[40802038] ; National Natural Science Foundation of China[41320104006]
WOS研究方向Geology
语种英语
WOS记录号WOS:000491683600010
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95728]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Liu, Jia-qi
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Korea Inst Geosci & Mineral Resources, Geol Res Div, 124 Gwahak Ro, Daejeon 34132, South Korea
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Shuang-shuang,Liu, Jia-qi,Lee, Seung-Gu. Mineral and geochemical characteristics for Jurassic volcanic rocks from ODP Site 801C in the Pigafetta Basin, Western Pacific Ocean: Implications for magmatic evolution at the oldest fast-spreading ridge[J]. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,2019,383:112-127.
APA Chen, Shuang-shuang,Liu, Jia-qi,&Lee, Seung-Gu.(2019).Mineral and geochemical characteristics for Jurassic volcanic rocks from ODP Site 801C in the Pigafetta Basin, Western Pacific Ocean: Implications for magmatic evolution at the oldest fast-spreading ridge.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,383,112-127.
MLA Chen, Shuang-shuang,et al."Mineral and geochemical characteristics for Jurassic volcanic rocks from ODP Site 801C in the Pigafetta Basin, Western Pacific Ocean: Implications for magmatic evolution at the oldest fast-spreading ridge".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 383(2019):112-127.

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来源：地质与地球物理研究所

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