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Geochronology and geochemistry of Late Carboniferous dykes in the Aqishan-Yamansu belt, eastern Tianshan: Evidence for a post-collisional slab breakoff
Long, Xiaoping1; Wu, Bin1; Sun, Min2; Yuan, Chao3; Xiao, Wenjiao4; Zuo, Rui1
2020
Source PublicationGEOSCIENCE FRONTIERS
ISSN1674-9871
Volume11Issue:1Pages:347-362
AbstractWith aim of providing constraints on the Late Paleozoic tectonic evolution of the southern Central Asian Orogenic Belt (CAOB), an integrated study was conducted on the geochronological and geochemical data for dioritic, granitic and diabase dykes from the Aqishan-Yamansu belt in the eastern Tianshan, NW China. Zircon U-Pb dating indicates that the dioritic and granitic dykes were both emplaced in the Late Carboniferous (similar to 311 Ma and similar to 315 Ma). The dioritic dykes show adakitic characteristics and have high Na2O and positive epsilon(Hf)(t) values (+12 to +17), which suggest an origin from partial melts of a subducted oceanic slab. The granitic dykes have high SiO2 and K2O contents and are characterized by enriched light rare earth elements (LREE) and slightly flat heavy rare earth elements (HREE), with negative Eu and Nb-Ta-Ti anomalies. These dykes are alkali-calcic and show geochemical features of highly fractionated I-type granites. Their positive epsilon(Hf)(t) values (+16 to +17) suggest that they were derived from a juvenile accreted oceanic crustal source. The coeval diabase dykes have low SiO2 and K2O contents but high TiO2, MgO and Mg# (54-59). They are enriched in LREE and show characteristics of enriched mid-ocean ridge basalts (E-MORB). The relatively high Ba/Th, slightly low Th/Ta ratios, and negative Nb-Ta anomalies imply a mantle source metasomatised by slab-derived fluids. Thus, these basic dykes were generated likely by partial melting of the upwelling asthenosphere mantle with a slight influence of slab-derived fluids. Therefore, we suggest that the formation of these Late Carboniferous dykes were triggered by a post-collisional slab breakoff and the Aqishan-Yamansu belt was a continental arc formed by south-dipping subduction of the Kangguer oceanic plate. (C) 2019, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
KeywordCentral Asian orogenic belt Eastern Tianshan Adakitic Highly fractionated I-Type granite Slab breakoff
DOI10.1016/j.gsf.2019.06.003
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
WOS KeywordZIRCON U-PB ; PALEOZOIC TECTONIC EVOLUTION ; NW CHINA IMPLICATIONS ; A-TYPE GRANITES ; OROGENIC BELT ; CENTRAL-ASIA ; VOLCANIC-ROCKS ; CONTINENTAL-CRUST ; YILI BLOCK ; GEODYNAMIC EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41421002] ; National Natural Science Foundation of China[41603028] ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; MOST Special Fund from the State Key Laboratory of Continental Dynamics ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000503182200021
PublisherCHINA UNIV GEOSCIENCES, BEIJING
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95876
Collection岩石圈演化国家重点实验室
Corresponding AuthorLong, Xiaoping
Affiliation1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
2.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Long, Xiaoping,Wu, Bin,Sun, Min,et al. Geochronology and geochemistry of Late Carboniferous dykes in the Aqishan-Yamansu belt, eastern Tianshan: Evidence for a post-collisional slab breakoff[J]. GEOSCIENCE FRONTIERS,2020,11(1):347-362.
APA Long, Xiaoping,Wu, Bin,Sun, Min,Yuan, Chao,Xiao, Wenjiao,&Zuo, Rui.(2020).Geochronology and geochemistry of Late Carboniferous dykes in the Aqishan-Yamansu belt, eastern Tianshan: Evidence for a post-collisional slab breakoff.GEOSCIENCE FRONTIERS,11(1),347-362.
MLA Long, Xiaoping,et al."Geochronology and geochemistry of Late Carboniferous dykes in the Aqishan-Yamansu belt, eastern Tianshan: Evidence for a post-collisional slab breakoff".GEOSCIENCE FRONTIERS 11.1(2020):347-362.
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