Permo-Triassic arc-like granitoids along the northern Lancangjiang zone, eastern Tibet: Age, geochemistry, Sr-Nd-Hf isotopes, and tectonic implications
文献类型：期刊论文
| 作者 | Wang, SF (Wang, Shifeng)1; Tang, WK (Tang, Wenkun)1; Wang, XY (Wang, Xinyu)1; Wang, C (Wang, Chao)2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2018-05-01 |
| 卷号 | 308期号:0页码:278-293 |
| 关键词 | METAMORPHIC CORE COMPLEXES DEEP-CRUSTAL STRUCTURE FELSIC IGNEOUS ROCKS PALEO-TETHYS OROGEN LU FAULT BELT SW CHINA SOUTHWEST CHINA CONTINENTAL SUBDUCTION SOUTHERN LANCANGJIANG CENTRAL QIANGTANG |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2018.03.008 |
| 英文摘要 | Large volumes of Permo-Triassic granitoids are exposed along the Northern Lancangjiang zone, eastern Tibet, and these rocks provide insights into the tectonic evolution of the Paleo-Tethys Ocean. We conducted detailed geological fieldwork and geochemical analysis of the Xiaochangdu and Kagong plutons that crop out along the Northern Lancangjiang magmatic belt. Zircon U-Pb data constrain the emplacement of the Xiaochangdu quartz diotites to between similar to 263 and similar to 257 Ma, and the Kagong granites and diorites to between similar to 234 and similar to 232 Ma. The Xiaochangdu quartz diorites are enriched in light rare earth (LREE) and large ion lithophile elements (LILE), depleted in high field strength elements (HFSE), have low (Sr-87/Sr-86); ratios, and near-positive epsilon(Nd) (t) ( -0.26 to 1.58) and epsilon(Hf)(t) (0.68-8.83) values, similar to typical subduction- related mantle-derived arc magmas. They are also characterized by high Al2O3 concentrations and low Nb/U (3.48-7.59) and Ce/Pb (3.22-4.86) ratios, indicating that their mantle source was modified by subducted pelagic sediments; Coeval granites and diorites from the Kagong pluton exhibit low A/CNK values, high LREE/HREE (heavy rare earth element) ratios, enrichment in LILE, and depletion in HFSE, also characteristic of typical arc magmas. Their variable SiO2 contents (57%- 75%),(Sr-87/Sr-86)(i) ratios, and epsilon(Nd) (t) (1.02-4.49) and epsilon(Hf)(t) (2.52-6.93) values, and relatively high zircon saturation temperatures (721-827 degrees C), suggest underplating of mantle-derived mafic melts beneath the lower crust. Their magmatic evolution can be explained using a MASH model. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000446791000018 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.itpcas.ac.cn/handle/131C11/8648]  |
| 专题 | 青藏高原研究所_图书馆 |
| 作者单位 | 1.Chinese Acad Geol Sci, Key Lab Neotecton Movement & GeoHazard, Minist Land & Resources, Inst Geotmech, Beijing 100081, Peoples R China; 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Wang, SF ,Tang, WK ,Wang, XY ,et al. Permo-Triassic arc-like granitoids along the northern Lancangjiang zone, eastern Tibet: Age, geochemistry, Sr-Nd-Hf isotopes, and tectonic implications[J]. LITHOS,2018,308(0):278-293. |
| APA | Wang, SF ,Tang, WK ,Wang, XY ,&Wang, C .(2018).Permo-Triassic arc-like granitoids along the northern Lancangjiang zone, eastern Tibet: Age, geochemistry, Sr-Nd-Hf isotopes, and tectonic implications.LITHOS,308(0),278-293. |
| MLA | Wang, SF ,et al."Permo-Triassic arc-like granitoids along the northern Lancangjiang zone, eastern Tibet: Age, geochemistry, Sr-Nd-Hf isotopes, and tectonic implications".LITHOS 308.0(2018):278-293. |
入库方式： OAI收割
来源：青藏高原研究所
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