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Genesis of "silicate exsolution lamellae" in chromite of the Stillwater Complex: A challenge to the high-pressure crystallization of ophiolitic chromitite

文献类型：期刊论文

作者Liu, Xia1,2,3; Su, Ben-Xun1,2,3; Bai, Yang1,2,3; Robinson, Paul T.2; Tang, Xu1; Xiao, Yan1; Xue, Ding-Shuai1,2,3; Cui, Meng-Meng3
刊名LITHOS
出版日期2020-12-15
卷号378页码:6
关键词Mineral lamellae Clinopyroxene Chromite Layered complex Ophiolite
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105796
英文摘要Models for deep derivation of ophiolitic chromite from the mantle transition zone versus magmatic crystallization at lithospheric level are now highly controversial due to the discovery of ultrahigh-pressure (UHP) and super-reduced (SuR) minerals in ophiolitic chromitites and the presence of silicate mineral exsolution lamellae in chromite grains. According to experimental studies, chromite grains crystallized at low-pressures cannot exsolve silicate phases because of their low contents of CaO and SiO2. However, clinopyroxene needles in chromite grains from the Stillwater Complex, which is a typical layered mafic-ultramafic intrusion crystallized at crustal level, show morphological, compositional and crystallographic features very similar to exsolution lamellae in ophiolitic chromite grains. We propose that the Stillwater clinopyroxene 'lamellae' represent minute melt inclusions that were attached parallel to branches of skeletal chromite where they were trapped during continued growth of the grain. This interpretation is supported by the orientations of the lamella-like clinopyroxene and the coexistence of larger clinopyroxene inclusions and apatite crystals along with the clinopyroxene needles. Another possibility is that these lamella-like minerals precipitated from melt/fluid that filled cracks in the chromite grains. Trails of tiny inclusions preserved in some healed fractures are consistent with this mechanism, but are inconsistent with the regular orientations of most of the needle-like 'inclusions'. The presence of such features in the Stillwater chromitites raises serious questions regarding the origin and significance of silicate lamellae in ophiolitic chromite grains and the use of such features to determine the depth of crystallization. (c) 2020 Elsevier B.V. All rights reserved.
资助项目National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41973012] ; National Natural Science Foundation of China[41772055]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000598168700006
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/132A11/99923]  
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
通讯作者Liu, Xia; Su, Ben-Xun
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Xia,Su, Ben-Xun,Bai, Yang,et al. Genesis of "silicate exsolution lamellae" in chromite of the Stillwater Complex: A challenge to the high-pressure crystallization of ophiolitic chromitite[J]. LITHOS,2020,378:6.
APA Liu, Xia.,Su, Ben-Xun.,Bai, Yang.,Robinson, Paul T..,Tang, Xu.,...&Cui, Meng-Meng.(2020).Genesis of "silicate exsolution lamellae" in chromite of the Stillwater Complex: A challenge to the high-pressure crystallization of ophiolitic chromitite.LITHOS,378,6.
MLA Liu, Xia,et al."Genesis of "silicate exsolution lamellae" in chromite of the Stillwater Complex: A challenge to the high-pressure crystallization of ophiolitic chromitite".LITHOS 378(2020):6.

入库方式： OAI收割

来源：地质与地球物理研究所

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