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Mineralogy, geochemistry, and zircon U-Pb-Hf isotopes of the Paleoproterozoic granulite-facies metamorphic rocks from the Aketashitage area, southeastern Tarim Craton
Wang, Zhong-Mei1; Han, Chun-Ming2,3; Xiao, Wen-Jiao1,3; Sakyi, Patrick Asamoah4; Yang, Lei1; Zhao, Na2
2019-02-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume321Pages:13-33
AbstractThe key to understanding the generation of mantle-derived magma and the formation of new continental crust is the recognition of the granulite-facies metamorphism, associated partial melting, and coeval magmatism that are documented in active continental margins. We firstly present a combined analysis of petrography, mineral chemistry, zircon U-Pb ages and hafnium (Hf) isotopes, in addition to whole-rock geochemistry on the garnet-biotite gneisses (Grt-Bi gneisses) and mafic granulites from the Aketashitage area, southeastern Tarim Craton. The implications of this analysis are discussed with respect to the thermal and tectonic evolution of the Tarim Craton. The Grt-Bi gneisses and mafic granulites are strongly peraluminous in composition and have flat REE patterns with negative Eu anomalies that are identical to those from the middle crust but higher than lower continental crust. Both the Grt-Bi gneisses and the mafic granulites have negative Nb-Ta anomalies, slightly positive Zr-Hf anomalies, and pronounced positive spikes in U and Pb. The characteristics in whole-rock geochemistry and mineral compositions indicate that the Grt-Bi gneisses and mafic granulites have the same source locality, which is most likely the garnet-bearing middle crust. The retrograde metamorphic P-T estimates for the Grt-Bi gneisses and mafic granulites are T = 574 degrees C; P = 7.0 kbar and T = 715 degrees C; P = 7.0 kbar, respectively. SIMS zircon U-Pb dating results reveal a large spread in metamorphic ages (2036-1962 Ma) for these granulite-facies rocks, interpreted to be the consequence of a large amount of magmas being added to the crust in an uninterrupted manner. Zircon Hf isotopes are characterized by variable but mostly negative epsilon(Hf) (t) values (-18.2 to -0.6), reasonably uniform Hf isotopic compositions, and highly variable T-DM(C) model ages between 2628 and 3599 Ma, representing a long-lived reworking of the preexisting crust. Our data, along with available geological evidences, lead us to propose a model for the evolution of the Dunhuang Block in the Paleoproterozoic. That is, the southeastern margin of the Tarim Craton, the Dunhuang Block was possibly an active continental margin during the Paleoproterozoic. The steep subduction of oceanic slab resulted in the thickening of the continental crust, which in turn caused the crust anatexis. The increase in asthenosphere high heat flow and the intrusion of mantle-derived magma induced extensive heating, which preceded the granulite-facies metamorphism and coeval magmatism in the middle crust of the southern Tarim Craton.
KeywordGarnet-biotite gneiss Mafic granulite Zircon U-Pb ages and Hf isotopes Dunhuang Block Active continental margins
DOI10.1016/j.precamres.2018.11.003
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project
WOS KeywordNW CHINA CONSTRAINTS ; SUBDUCTION-RELATED MAGMATISM ; ARCHEAN CONTINENTAL-CRUST ; DUNHUANG OROGENIC BELT ; AQTASHTAGH AREA ; GEOCHRONOLOGICAL EVIDENCE ; METASEDIMENTARY ROCKS ; PALEOZOIC SUBDUCTION ; TRACE-ELEMENTS ; ALTYN TAGH
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0601205] ; 973 Program[2014CB440801] ; National Natural Science Foundation[41702236] ; China Postdoctoral Foundation Fund Project[2015M580133]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project ; National Key R&D Program of China ; National Key R&D Program of China ; 973 Program ; 973 Program ; National Natural Science Foundation ; National Natural Science Foundation ; China Postdoctoral Foundation Fund Project ; China Postdoctoral Foundation Fund Project
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000457657500002
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90525
Collection岩石圈演化国家重点实验室
Corresponding AuthorWang, Zhong-Mei
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
4.Univ Ghana, Dept Earth Sci, POB LG 58, Legon, Ghana
Recommended Citation
GB/T 7714
Wang, Zhong-Mei,Han, Chun-Ming,Xiao, Wen-Jiao,et al. Mineralogy, geochemistry, and zircon U-Pb-Hf isotopes of the Paleoproterozoic granulite-facies metamorphic rocks from the Aketashitage area, southeastern Tarim Craton[J]. PRECAMBRIAN RESEARCH,2019,321:13-33.
APA Wang, Zhong-Mei,Han, Chun-Ming,Xiao, Wen-Jiao,Sakyi, Patrick Asamoah,Yang, Lei,&Zhao, Na.(2019).Mineralogy, geochemistry, and zircon U-Pb-Hf isotopes of the Paleoproterozoic granulite-facies metamorphic rocks from the Aketashitage area, southeastern Tarim Craton.PRECAMBRIAN RESEARCH,321,13-33.
MLA Wang, Zhong-Mei,et al."Mineralogy, geochemistry, and zircon U-Pb-Hf isotopes of the Paleoproterozoic granulite-facies metamorphic rocks from the Aketashitage area, southeastern Tarim Craton".PRECAMBRIAN RESEARCH 321(2019):13-33.
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