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	Exsolution Lamellae in Olivine Grains of Dunite Units from Different Types of Mafic-Ultramafic Complexes
	Liang Zi4,5; Xiao Yan5; Thakurta, Joyashish3; Su Benxun2,4; Chen Chen2,4; Bai Yang2,4; Sakyi, Patrick A.1
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2018-04-01
卷号	92期号:2页码:586-599
关键词	olivine dunite clinopyroxene lamella intergrowth of clinopyroxene and magnetite mafic-ultramafic complex
ISSN号	1000-9515
DOI	10.1111/1755-6724.13544
英文摘要	Exsolution microstructures in olivine grains from dunite units in a few selected tectonic environments are reported here. They include lamellae of clinopyroxene and clinopyroxene-magnetite intergrowth in the Gaositai and Yellow Hill Alaskan-type complexes, clinopyroxene-magnetite intergrowth in the Kizildag ophiolite, and chromite lamellae in the Hongshishan mafic-ultramafic intrusive complex. These lamellae commonly occur as needle- or rod-like features and are oriented in olivine grains. The host olivine grains have Fo contents of 92.5-92.6 in the Gaositai complex, 86.5-90.1 in the Yellow Hill complex, 93.2-93.4 in the Kizildag ophiolite and 86.9-88.3 in the Hongshishan complex. Clinopyroxene in the rod-like intergrowth exsolved in olivine grains in the Gaositai and Yellow Hill is diopside with similar major element compositions of CaO (23.6-24.3wt%), SiO2 (52.2-54.0wt%), Al2O3 (0.67-2.15wt%), Cr2O3 (0.10-0.42wt%) and Na2O (0.14-0.26wt%). It falls into the compositional field of hydrothermal clinopyroxene and its origin is thus probably related to reaction between dunite and fluids. The enrichment of the fluids in Ca2+, Fe3+, Cr3+ and Na+, resulted in elevated concentrations of these cations in olivine solid solutions via the reaction. With decreasing temperature, the olivine solid solutions altered to an intergrowth of magnetite and clinopyroxene. The Fe3+ and Cr3+ preferentially partitioned into magnetite, while Ca2+ and Na+ entered clinopyroxene. Since the studied Alaskan-type complexes and ophiolite formed in a subduction environment, the fluids were probably released from the subducted slab. In contrast, the exsolved chromite in olivine grains from the Hongshishan complex that formed in post-orogenic extension setting can be related to olivine equilibrated with Cr-bearing liquid. Similarly, these lamellae have all been observed in serpentine surrounding olivine grains, indicating genetic relations with serpentinization.
资助项目	National Natural Science Foundation of China[41522203] ; National Natural Science Foundation of China[41673037] ; National Natural Science Foundation of China[41772055] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2017095]
WOS关键词	VICTOR KIMBERLITE PIPE ; ALASKAN-TYPE COMPLEX ; LUOBUSA OPHIOLITE ; GARNET EXSOLUTION ; SOUTHERN TIBET ; ORTHO-PYROXENE ; PODIFORM CHROMITITES ; DIFFUSION GRADIENTS ; ELEMENT ABUNDANCES ; TETHYAN OPHIOLITES
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000437257000010
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 ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/94007]
专题	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	Liang Zi; Xiao Yan
作者单位	1.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, Legon, Ghana 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.Western Michigan Univ, Dept Geosci, 1903 West Michigan Ave, Kalamazoo, MI 49008 USA 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.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	Liang Zi,Xiao Yan,Thakurta, Joyashish,et al. Exsolution Lamellae in Olivine Grains of Dunite Units from Different Types of Mafic-Ultramafic Complexes[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2018,92(2):586-599.
APA	Liang Zi.,Xiao Yan.,Thakurta, Joyashish.,Su Benxun.,Chen Chen.,...&Sakyi, Patrick A..(2018).Exsolution Lamellae in Olivine Grains of Dunite Units from Different Types of Mafic-Ultramafic Complexes.ACTA GEOLOGICA SINICA-ENGLISH EDITION,92(2),586-599.
MLA	Liang Zi,et al."Exsolution Lamellae in Olivine Grains of Dunite Units from Different Types of Mafic-Ultramafic Complexes".ACTA GEOLOGICA SINICA-ENGLISH EDITION 92.2(2018):586-599.

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