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Petrogenesis of Late Paleozoic diorites and A-type granites in the central Eastern Tianshan, NW China: Response to post-collisional extension triggered by slab breakoff
Du, Long1,2,3; Long, Xiaoping1; Yuan, Chao2; Zhang, Yunying2; Huang, Zongying2; Sun, Min4; Xiao, Wenjiao5
2018-10-01
Source PublicationLITHOS
ISSN0024-4937
Volume318Pages:47-59
AbstractGeological evolution of the Eastern Tianshan in the Late Paleozoic is significant to understanding the multiple accretions and final formation of the southern Central Asian Orogenic Belt. Here, we report new whole-rock geochemical and Sr-Nd is otopic data, and in situ zircon U-Pb ages for three typical A-type granitic intrusions (syenogranite, K-feldspar granite and monzonitic granite) and one dioritic pluton in the central Eastern Tianshan, NW China, in order to constrain their petrogenesis, tectonic setting and geodynamic evolution. Zircon LA-ICP-MS U-Pb ages indicate that the syenogranites and K-feldspar granites were both formed during a short time interval in the Early Permian (284-286 Ma), whereas the diorites were crystallized at 293 +/- 6 Ma. The monzonitic granites were generated at 307 +/- 3 Ma, earlier than the other two granitic intrusions. The three kinds of granites (syenogranite, K-feldspar granite and monzonitic granite) have high HFSE, HREE and Y/Nb ratios (1.68-2.84), and remarkably low Sr and Ba contents, with the absence of aluminium-rich minerals and show metaluminous to weakly peraluminous natures, indicating geochemical characteristics of aluminous A(2)-type granites. These granites show negative epsilon(Nd)(t) (-3.32 to -4.40) values and Mesoproterozoic two stage Nd model ages (T-DM(2) = 1.36 to 1.43 Ga), which suggest a relatively old crustal source for these rocks. The Sr-Nd isotopic compositions imply that the Mesoproterozoic metamorphic basement of the Central Tianshan Block can be considered as a potential magmatic source for these aluminous A(2)-type granites. In addition, they have geochemical characteristics similar to the experimental melt that was derived from partial melting of crustal metaigneous rocks at the depth of middle to lower crust levels. Therefore, the granites were most likely produced by partial melting of metaigneous rocks in a post-collisional extensional setting. The diorites have low SiO2 and high MgO, with uniform (Sr-87/Sr-86)(i) values (similar to 0.7055), negative epsilon(Nd)(t) values (-4.11 to -4.59) and Mesoproterozoic two stage Nd model ages (T-DM(2) = 1.41 to 1.45 Ga). They have higher Ti/Zr (42.8-46.7) and Ti/Y (280-359) ratios than continental crust and show negative Nb-Ta-Ti anomalies, which can be explained by partial melting of a relatively fertile mantle modified by old crustal materials of the Central Tianshan Block. The formation of the dioritic pluton was induced by an upwelling asthenosphere in an extensional geodynamic setting. Based on the zircon saturation temperatures of these A-type granites and the distribution of Late Carboniferous to Early Permian mantle derived intrusions, a slab breakoff model is suggested to interpret the formation of the studied A-type granites and diorites. We infer that the slab breakoff was initiated in the Late Carboniferous and ended in the Early Permian. (C) 2018 Elsevier B.V. All rights reserved.
KeywordA-type granite Post-collisional Slab breakoff Eastern Tianshan Central Asian Orogenic Belt
DOI10.1016/j.lithos.2018.08.006
Funding OrganizationNational Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 KeywordASIAN OROGENIC BELT ; LARGE IGNEOUS PROVINCE ; AQISHAN-YAMANSU BELT ; MA MANTLE PLUME ; ZIRCON U-PB ; GEOCHEMICAL CONSTRAINTS ; TECTONIC IMPLICATIONS ; SOUTHEASTERN AUSTRALIA ; GEODYNAMIC EVOLUTION ; NORTHWESTERN CHINA
Language英语
Funding ProjectNational Basic Research Program of China[2014CB440801] ; National Natural Science Foundation of China[41421002] ; National Natural Science Foundation of China[41522202] ; National Natural Science Foundation of China[41603028] ; MOST Special Fund from the State Key Laboratory of Continental Dynamics
Funding OrganizationNational Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 Basic Research Program of China ; National Basic Research Program of China ; 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 AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000449141300004
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89423
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.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
3.Shandong Univ Sci & Technol, Coll Geol Sci & Engn, Qingdao 266590, Peoples R China
4.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Du, Long,Long, Xiaoping,Yuan, Chao,et al. Petrogenesis of Late Paleozoic diorites and A-type granites in the central Eastern Tianshan, NW China: Response to post-collisional extension triggered by slab breakoff[J]. LITHOS,2018,318:47-59.
APA Du, Long.,Long, Xiaoping.,Yuan, Chao.,Zhang, Yunying.,Huang, Zongying.,...&Xiao, Wenjiao.(2018).Petrogenesis of Late Paleozoic diorites and A-type granites in the central Eastern Tianshan, NW China: Response to post-collisional extension triggered by slab breakoff.LITHOS,318,47-59.
MLA Du, Long,et al."Petrogenesis of Late Paleozoic diorites and A-type granites in the central Eastern Tianshan, NW China: Response to post-collisional extension triggered by slab breakoff".LITHOS 318(2018):47-59.
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