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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?
Tan, Zhou1,2; Gao, Jun1,2; Jiang, Tuo3; Wang, Xinshui1; Zhang, Xi4
2019-07-03
Source PublicationINTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
Volume61Issue:10Pages:1270-1293
AbstractThe 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.
Keyword(U)HP metamorphism oceanic eclogite thermodynamic modelling muscovite Ar-Ar dating juxtaposition during exhumation Chinese southwestern Tianshan
DOI10.1080/00206814.2018.1507760
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
WOS KeywordCALCULATED MINERAL EQUILIBRIA ; TRACE-ELEMENT MOBILIZATION ; FLUID-ROCK INTERACTION ; NW-CHINA IMPLICATIONS ; SOUTH TIANSHAN ; WESTERN TIANSHAN ; METAMORPHIC EVOLUTION ; TECTONIC IMPLICATIONS ; PALEOZOIC TECTONICS ; NORTHWESTERN CHINA
Language英语
Funding ProjectNational Natural Science Foundation of China[41025008] ; National Natural Science Foundation of China[41390440] ; National Natural Science Foundation of China[41390445]
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
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000466372400006
PublisherTAYLOR & FRANCIS INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92119
Collection矿产资源研究院重点实验室
Corresponding AuthorGao, Jun
Affiliation1.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
Recommended Citation
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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