U-Pb zircon age, geochemical and Sr-Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet

	U-Pb zircon age, geochemical and Sr-Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet
	Shen Liu; Ruizhong Hu; Shan Gao; Caixia Feng; Ian M. Coulson; Guangying Feng; Youqiang Qi; Yuhong Yang; Chaogui Yang; Liang Tang
	2012
Source Publication	Journal of Asian Earth Sciences
Volume	45 Issue:2 Pages:150-161
Abstract	Mesozoic post-collisional andesites occur in the Gerze area within the Qiangtang Terrane of northern Tibet, China. Geochronological, geochemical, and whole-rock Sr-Nd isotopic analyses were performed on this suite of volcanic rocks to characterize their petrogenesis. Laser ablation-inductively coupled plasma-mass spectrometry U-Pb zircon analyses yielded consistent ages ranging from 122.4 +/- 0.4 Ma to 124.4 +/- 0.4 Ma for two andesite samples (JC01 and GZ01). The andesites belong to the alkaline and sub-alkaline magma series in terms of K2O + Na2O contents (4.7-10 wt.%), and belong to the high-K calc-alkaline and calc-alkaline series on the basis of their high K2O contents (1.0-3.3 wt.%). The volcanic rocks are further characterized by the enrichment of light rare earth elements [(La/Yb)(N) = 7.4-11.5] and large-ion lithophile elements (e.g., Rb), slightly negative Eu anomalies (Eu/Eu* = 0.79-0.94), and negative anomalies in high field strength elements (e.g., Nb, Ta, and Ti) relative to primitive mantle. The samples show slightly elevated (Sr-87/Sr-86)(i) values that range from 0.7049 to 0.7057, and low epsilon(Nd)(t) values of -3.4 to 0.7. These results suggest that the rocks were derived from a compositionally heterogeneous mantle source and that their parent magmas are basalt magma. The parent mafic magmas may have undergone fractional crystallization of olivine, pyroxene, hornblende, and to a lesser extent, plagioclase during ascent through the thickened crustal pile, with minor or no crustal contamination, before the finally erupting as andesites.
Keyword	Andesite Petrogenesis Qiangtang Terrene Northern Tibet
Subject Area	矿床地球化学
Indexed By	SCI
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/352002/4874
Collection	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_期刊论文矿床地球化学国家重点实验室
Recommended Citation GB/T 7714	Shen Liu,Ruizhong Hu,Shan Gao,et al. U-Pb zircon age, geochemical and Sr-Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet[J]. Journal of Asian Earth Sciences,2012,45(2):150-161.
APA	Shen Liu.,Ruizhong Hu.,Shan Gao.,Caixia Feng.,Ian M. Coulson.,...&Liang Tang.(2012).U-Pb zircon age, geochemical and Sr-Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet.Journal of Asian Earth Sciences,45(2),150-161.
MLA	Shen Liu,et al."U-Pb zircon age, geochemical and Sr-Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet".Journal of Asian Earth Sciences 45.2(2012):150-161.

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