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  2. 地质与地球物理研究所
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  4. 中国科学院矿产资源研究重点实验室
Petrogenesis of the Ultramafic Zone of the Stillwater Complex in North America: constraints from mineral chemistry and stable isotopes of Li and O

文献类型：期刊论文

作者Su, Ben-Xun2,3,4; Bai, Yang2,3,4; Cui, Meng-Meng2,3,4; Wang, Jing2,3,4; Xiao, Yan3,6; Lenaz, Davide1; Sakyi, Patrick Asamoah5; Robinson, Paul T.4
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2020-06-23
卷号175期号:7页码:20
关键词Li isotopes Oxygen isotopes Chromite Olivine Pyroxene Layered intrusion
ISSN号0010-7999
DOI10.1007/s00410-020-01707-y
英文摘要To investigate the petrogenesis of cyclic units in layered intrusions, we examined chromitite, dunite, poikilitic harzburgite and bronzitite from the Ultramafic Zone of the Stillwater Complex and measured stable isotopes of Li and O in their major minerals. The Li isotopes in olivine range from 4 to 26 parts per thousand in delta Li-7 with uniform Li contents of 1-3 ppm, whereas orthopyroxene and clinopyroxene have Li contents of 0.5-5 ppm and 4-8 ppm, and delta Li-7 ranges of -13 to 7 parts per thousand and -14 to -6 parts per thousand, respectively. The delta O-18 values vary from 4.91 to 5.72 parts per thousand in olivine, from 5.11 to 5.87 parts per thousand in orthopyroxene, and from 4.64 to 5.86 parts per thousand in clinopyroxene. For a given sample, olivine displays more variable and higher delta Li-7 but lower delta O-18 values than orthopyroxene, indicating that olivine experienced more extensive compositional modification after crystallization relative to orthopyroxene. The general Li and O isotopic compositions are interpreted as the result of re-equilibration between interstitial liquids, from which pyroxenes crystallized, and cumulus minerals. The inter-mineral and inter-sample isotopic variations correlate with mineral assemblages, crystal sizes and major and trace element compositions, revealing that the interstitial liquids varied compositionally mainly due to mixing between fractionated magma and newly injected primitive magma. Abrupt mineralogical and geochemical changes from silicate rocks to chromitites imply that hydrous fluids, which collected on chromite surfaces and were later released from chromite seams, played an additional, critical medium of chemical exchange between minerals in the chromitites.
WOS关键词LAYERED INTRUSIONS ; PERIDOTITE ZONE ; PODIFORM CHROMITITE ; BUSHVELD COMPLEX ; LITHIUM ; MANTLE ; CRYSTALLIZATION ; ORIGIN ; MONTANA ; FRACTIONATION
资助项目National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41772055] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0801]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000544890600001
出版者SPRINGER
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 ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/97135]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
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Su, Ben-Xun
作者单位1.Univ Trieste, Dept Math & Geosci, Via Weiss 8, I-34127 Trieste, Italy
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Univ Ghana, Dept Earth Sci, POB LG 58, Legon, Ghana
6.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		 Su, Ben-Xun,Bai, Yang,Cui, Meng-Meng,et al. Petrogenesis of the Ultramafic Zone of the Stillwater Complex in North America: constraints from mineral chemistry and stable isotopes of Li and O[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2020,175(7):20.
APA Su, Ben-Xun.,Bai, Yang.,Cui, Meng-Meng.,Wang, Jing.,Xiao, Yan.,...&Robinson, Paul T..(2020).Petrogenesis of the Ultramafic Zone of the Stillwater Complex in North America: constraints from mineral chemistry and stable isotopes of Li and O.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,175(7),20.
MLA Su, Ben-Xun,et al."Petrogenesis of the Ultramafic Zone of the Stillwater Complex in North America: constraints from mineral chemistry and stable isotopes of Li and O".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 175.7(2020):20.

入库方式： OAI收割

来源：地质与地球物理研究所

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