| 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 | |
| 发表期刊 | Journal of Asian Earth Sciences
 |
| 卷号 | 45期号:2页码:150-161 |
| 摘要 | 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. |
| 关键词 | Andesite Petrogenesis Qiangtang Terrene Northern Tibet |
| 学科领域 | 矿床地球化学 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/4874 |
| 专题 | 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 |
| 推荐引用方式 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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