Late Carboniferous adakitic granodiorites in the Qiongkusitai area, western Tianshan, NW China: Implications for partial melting of lower crust in the southern Central Asian Orogenic Belt

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	Late Carboniferous adakitic granodiorites in the Qiongkusitai area, western Tianshan, NW China: Implications for partial melting of lower crust in the southern Central Asian Orogenic Belt
	Wenjiao Xiao; Jiyuan Yin; Wen Chen; Chao Yuan; Xiaoping Long; Keda Cai; Bin Zhang
刊名	Journal of Asian Earth Sciences
	2016
卷号	124 期号:1 页码:42-54
关键词	Adakitic Granodiorite Slab Roll-back Partial Melting Of Lower Crust West Tianshan Carboniferous
英文摘要	Carboniferous granitic rocks are wide spread in the western Tianshan, but their tectonic contexts remain controversial. We present zircon U-Pb age, major element, trace element, and in situ zircon Hf isotopic data for the Qiongkusitai granodiorites from the southern part of the Yili block in the western Tianshan. The granodiorites were emplaced in the Late Carboniferous (ca. 314 Ma) and are characterized by high SiO2 (62.1-65.7 wt.%), high Sr (376-485 ppm), low Y (13.7-17.7 ppm) and low Yb (1.34-1.81 ppm) with Sr/Y ratios of 23-34. Such characteristics imply adakitic affinities. Their low concentrations of Cr (3.85-6.75 ppm), Co (7.63-10.7 ppm) and Ni (2.94-6.80 ppm) suggest little, if any, interaction with a mantle source. Compared to the thickened lower crustal-derived adakitic rocks, the relatively low Nb/Ta ratios of the Qiongkusitai adakitic granodiorites indicate that they were probably generated by partial melting of amphibolite fades rocks, but not eclogite fades rocks. The Qiongkusitai adakitic granodiorites have positive zircon epsilon(Hf(t)) values of +0.7 to +5.1 and T-DM2 of 1.28-1.68 Ga, and they are interpreted as being derived from remelting of amphibolite facies Mesoproterozoic basement with an input of juvenile material. Late Carboniferous magmatism in the western Tianshan was possibly triggered by asthenospheric upwelling as a result of the roll-back of the subducted southern Tianshan oceanic lithosphere.
学科主题	矿床地球化学
语种	英语
公开日期	2017-09-14
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6219]
专题	地球化学研究所_矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Wenjiao Xiao,Jiyuan Yin,Wen Chen,et al. Late Carboniferous adakitic granodiorites in the Qiongkusitai area, western Tianshan, NW China: Implications for partial melting of lower crust in the southern Central Asian Orogenic Belt[J]. Journal of Asian Earth Sciences,2016,124(1):42-54.
APA	Wenjiao Xiao.,Jiyuan Yin.,Wen Chen.,Chao Yuan.,Xiaoping Long.,...&Bin Zhang.(2016).Late Carboniferous adakitic granodiorites in the Qiongkusitai area, western Tianshan, NW China: Implications for partial melting of lower crust in the southern Central Asian Orogenic Belt.Journal of Asian Earth Sciences,124(1),42-54.
MLA	Wenjiao Xiao,et al."Late Carboniferous adakitic granodiorites in the Qiongkusitai area, western Tianshan, NW China: Implications for partial melting of lower crust in the southern Central Asian Orogenic Belt".Journal of Asian Earth Sciences 124.1(2016):42-54.