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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 PublicationJournal of Asian Earth Sciences
Volume45Pages: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 (87Sr/86Sr)i values that range from 0.7049 to 0.7057, and low εNd(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.

KeywordAndesite petrogenesis qiangtang Terrene northern Tibet
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9462
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.Solid Earth Studies Laboratory, Department of Geology, University of Regina, Regina, Saskatchewan, Canada S4S 0A2
Recommended Citation
GB/T 7714
Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Youqiang Qi;Yuhong Yang;Chaogui Yang;Liang Tang. 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,2012,45:150-161.
APA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Youqiang Qi;Yuhong Yang;Chaogui Yang;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,45,150-161.
MLA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Ian M. Coulson;Guangying Feng;Youqiang Qi;Yuhong Yang;Chaogui Yang;Liang Tang."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(2012):150-161.
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