中国科学院机构知识库网格系统: P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?

P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?

文献类型：期刊论文


作者	Tan, Zhou 1,2; Gao, Jun 1,2; Jiang, Tuo 3; Wang, Xinshui 1; Zhang, Xi 4
刊名	INTERNATIONAL GEOLOGY REVIEW
出版日期	2019-07-03
卷号	61 期号:10 页码:1270-1293
关键词	(U)HP metamorphism oceanic eclogite thermodynamic modelling muscovite Ar-Ar dating juxtaposition during exhumation Chinese southwestern Tianshan
ISSN号	0020-6814
DOI	10.1080/00206814.2018.1507760
英文摘要	The Chinese southwestern Tianshan HP-UHP/LT metamorphic complex possesses well-preserved mafic layers, tectonic slices/blocks, boudins/lens of different sizes, and lithology embedded within dominant metavolcanoclastics. A recent study on the ultra-high pressure (UHP) eclogite revealed a short timescale of exhumation (<= 10 Ma, similar to 315 +/- 5 Ma). However, controversies still exist on some key questions: (1) the reasonable interpretation of spatially close-outcropped high pressure (HP) and UHP slices with respect to regional geodynamics, and (2) if the previous regional scatter Ar-Ar ages proved the existence of internally coherent sub-belts or troubled by dating on samples with notable Ar-40 retention. This study focusses on detailed P-T-time (phengite Ar closure) recovery of samples from a HP eclogite lens and its host rock, the UHP thick-layered eclogite. Based on data from bulk-rock, microprobe analysis, and muscovite Ar-Ar chronological dating, we link phengite growth to potential garnet growth stages via thermodynamic modelling. Facilitated by the P-T-Ar retention% graph, we collect all the regional muscovite Ar-Ar data together with results in this study for evaluating the significance of regional muscovite Ar-Ar ages and set back to geodynamics. According to modelling results, the HP lens eclogite reached peak metamorphism at similar to 550 degrees C, 2.50 GPa with an Ar-Ar muscovite plateau age of 316.9 +/- 1.0 Ma that could date the mass phengite growth event during prograde metamorphism. In contrast, the UHP layered eclogite experienced UHP peak burial at similar to 510 degrees C, 2.95 GPa, and then to HP peak metamorphism at similar to 560 degrees C, 2.60 GPa with similar to 311.6 +/- 0.7 Ma plateau age that may constrain the cooling age during early exhumation. Noteworthy, both of them share a quite similar early exhumation path despite bearing contrasting prograde metamorphic experiences. With considering updated regional exhumation pattern, this might imply the existence of a potential deep juxtaposing (capture) process between HP slices and exhumating UHP complex, at about 45-60 km depth along subduction plate interface.
WOS关键词	CALCULATED MINERAL EQUILIBRIA ; TRACE-ELEMENT MOBILIZATION ; FLUID-ROCK INTERACTION ; NW-CHINA IMPLICATIONS ; SOUTH TIANSHAN ; WESTERN TIANSHAN ; METAMORPHIC EVOLUTION ; TECTONIC IMPLICATIONS ; PALEOZOIC TECTONICS ; NORTHWESTERN CHINA
资助项目	National Natural Science Foundation of China[41025008] ; National Natural Science Foundation of China[41390440] ; National Natural Science Foundation of China[41390445]
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000466372400006
出版者	TAYLOR & FRANCIS INC
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
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92119]
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	Gao, Jun
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.China Geol Survey, Lab Isotope Geochem, Wuhan Ctr, Wuhan, Hubei, Peoples R China 4.China Minmet Corp, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Tan, Zhou,Gao, Jun,Jiang, Tuo,et al. P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?[J]. INTERNATIONAL GEOLOGY REVIEW,2019,61(10):1270-1293.
APA	Tan, Zhou,Gao, Jun,Jiang, Tuo,Wang, Xinshui,&Zhang, Xi.(2019).P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?.INTERNATIONAL GEOLOGY REVIEW,61(10),1270-1293.
MLA	Tan, Zhou,et al."P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?".INTERNATIONAL GEOLOGY REVIEW 61.10(2019):1270-1293.

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来源：地质与地球物理研究所

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P-T-time (phengite Ar closure) history of spatially close-outcropping HP and UHP oceanic eclogites (southwestern Tianshan): implication for a potential deep juxtaposing process during exhumation?

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