Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution
文献类型：期刊论文
| 作者 | Li Hang2,3,4; Ke Qiang2,3,4; Li Hao2,3,4; Hong Tao2,3,4; Zhao TongShou1; Xu XingWang2,3,4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2020 |
| 卷号 | 36期号:4页码:1041-1058 |
| 关键词 | Karakoram terrane Tianshuihai Tectonic evolution Gabbro Precambrian basement |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2020.04.05 |
| 英文摘要 | The Karakoram terrane is an important unit of the Tibet Plateau. Recently, we carried on geological survey on the Linjitang Mesozoic basin, southeastern Karakoram, and found a gabbro intrusion in the Tianshuihai area. The gabbro has some distinct geochemical signatures, including: 1) high Al2O3 (15.07% similar to 15.32%) and TiO2 (1.31% similar to 1.34%), low P2O5 (0.19% similar to 0.21%) and alkali (Na2O+K2O = 3.49% similar to 3.72%); 2) enriched in LREE (La/Yb = 6.17 similar to 7.39) and Th, La, Nd and Tb, and depleted in Rb, Sr, P and Y; and 3) enriched Sm-Nd isotope with eNd values between -5.80 and -5.90. The gabbro has LA-ICP-MS zircon Pb-206/U-238 age of 102 +/- 1Ma (MSWD = 0.92; n = 14), indicating that the pluton was emplaced in the late Early Cretaceous. The gabbro contains a great number of inherited zircons, 38 of which have ages ranging from 2450 to 232Ma, 16 of them are Precambrian zircons, suggesting existence of Precambrian basement. These geochemical evidence and occurrence of inherited zircons indicate that the gabbro with extensive crustal contamination in extensional setting related to asthenosphere upwelling, this means that the Tianshuihai area was in an extensional setting at 102Ma. Combining with regional geological evidence, it is suggested that tectonic framework of the Tianshuihai area was changed into extensional at an initial stage of the Late Cretaceous Linjitang basin, and proposed that the Karakoram terrane had gone through three stage tectonic evolution in Mesozoic period, i.e. the Jurassic-Early Cretaceous normal subduction and arc-basin system, plate subduction and orogeny at Early Cretaceous, and the Late Cretaceous normal subduction and arc-basin system. |
| WOS关键词 | BACK-ARC BASIN ; LA-ICP-MS ; CALC-ALKALINE GRANITOIDS ; ALEUTIAN ISLAND-ARC ; WESTERN TIBET ; CONTINENTAL-CRUST ; VOLCANIC-ROCKS ; TRACE-ELEMENTS ; OROGENIC BELT ; MAGMA SOURCE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000534690600005 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/96702]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Xu XingWang |
| 作者单位 | 1.Xinjiang Bur Geol & Mineral Explorat & Dev, Geophys & Geochem Explorat Team, Changji 831100, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Hang,Ke Qiang,Li Hao,et al. Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution[J]. ACTA PETROLOGICA SINICA,2020,36(4):1041-1058. |
| APA | Li Hang,Ke Qiang,Li Hao,Hong Tao,Zhao TongShou,&Xu XingWang.(2020).Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution.ACTA PETROLOGICA SINICA,36(4),1041-1058. |
| MLA | Li Hang,et al."Discovery of 102Ma gabbro in the Tianshuihai area of Karakoram terrane, and its constraints on regional Mesozoic tectonic evolution".ACTA PETROLOGICA SINICA 36.4(2020):1041-1058. |
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来源：地质与地球物理研究所
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