IGGCAS OpenIR  > 新生代地质与环境院重点实验室
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
Chen, Shuang-shuang1,2,3; Liu, Jia-qi1,3; Lee, Seung-Gu4
2019-10-01
Source PublicationJOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
ISSN0377-0273
Volume383Pages:112-127
AbstractDespite 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.
KeywordOcean Drilling Project Site 801C Pigafetta Basin Zoning texture Fast spreading ridge Within-plate alkaline volcanism
DOI10.1016/j.jvolgeores.2017.09.024
Funding OrganizationNational 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
WOS KeywordTRACE-ELEMENT ; CHEMICAL CLASSIFICATION ; PARTITION-COEFFICIENTS ; GEOLOGICAL SAMPLES ; LIQUID EQUILIBRIA ; JAPAN SEA ; MANTLE ; CLINOPYROXENE ; BASALTS ; SR
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000491683600010
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95728
Collection新生代地质与环境院重点实验室
岩石圈演化国家重点实验室
Corresponding AuthorLiu, Jia-qi
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Korea Inst Geosci & Mineral Resources, Geol Res Div, 124 Gwahak Ro, Daejeon 34132, South Korea
First Author AffilicationKey Laboratory of Cenozoic Geology and Environment, Chinese Academy of Sciences;  State Key Laboratory of Lithospheric Evolution;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Cenozoic Geology and Environment, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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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