Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites
文献类型：期刊论文
| 作者 | Chen, Si2,3,4; Chen, Yi2,3,5; Guillot, Stephane1; Li, Qiuli2,3,5 |
| 刊名 | FRONTIERS IN EARTH SCIENCE
 |
| 出版日期 | 2022-02-03 |
| 卷号 | 9页码:12 |
| 关键词 | Himalaya Stak eclogites zircon chronology subduction dip angle |
| DOI | 10.3389/feart.2021.790999 |
| 英文摘要 | The occurrence of ultrahigh-pressure (UHP) and high-pressure (HP) rocks in the Himalayan orogen has been conventionally attributed to the different subduction dip angles along the strike. The western Himalayan UHP eclogites point to a steep continental subduction in the Eocene. The present-day geophysical data show low subduction dip angles of the Indian lithosphere beneath southern Tibet and Karakoram, implying that a shift from steep to low-angle subduction probably happened in the western Himalaya. However, the timing and mechanism of such a subduction-angle change are still unknown. Here we present a combined analysis of zircon geochronology and geochemistry of eclogites and gneiss in the Stak massif, western Himalaya. Metamorphic zircons equilibrated with garnet and omphacite show flat heavy rare earth element patterns without Eu anomalies and, thus, yield similar eclogite-facie ages of ca. 31 Ma. The Stak HP eclogite-facie metamorphism is at least 15 Ma younger than those measured in the western Himalayan UHP eclogites, but broadly contemporaneous with other Himalayan HP rocks. Therefore, all the Himalayan HP rocks record higher peak geothermal gradients and younger ages than those of the UHP rocks. Our new data, combined with the magmatic lull observed in the Kohistan-Ladakh-Gangdese arc and with the convergent rate of the Indian plate, suggest a change in subduction dip angle over time. Consequently, we suggest that the entire Indian continental lithosphere experienced an approximately coherent shift from steep to low-angle subduction after the breakoff of the Neo-Tethyan slab since the middle Eocene. This critical change in subduction geometry is interpreted to be responsible for the transition from continental subduction to collision dynamics. |
| WOS关键词 | INDUS SUTURE ZONE ; ZIRCON U-PB ; SLAB BREAKOFF ; PRESSURE METAMORPHISM ; NORTHWEST HIMALAYA ; NEOTETHYAN SLAB ; STAK ECLOGITE ; HF ISOTOPES ; EXHUMATION ; EOCENE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000759819900001 |
| 出版者 | FRONTIERS MEDIA SA |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/104929]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Chen, Yi |
| 作者单位 | 1.Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, Grenoble, France 2.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, Beijing, Peoples R China 3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Beijing, Peoples R China 4.Guangzhou Marine Geol Survey, Minist Nat Resources, Key Lab Marine Mineral Resources, Guangzhou, Peoples R China 5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Si,Chen, Yi,Guillot, Stephane,et al. Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites[J]. FRONTIERS IN EARTH SCIENCE,2022,9:12. |
| APA | Chen, Si,Chen, Yi,Guillot, Stephane,&Li, Qiuli.(2022).Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites.FRONTIERS IN EARTH SCIENCE,9,12. |
| MLA | Chen, Si,et al."Change in Subduction Dip Angle of the Indian Continental Lithosphere Inferred From the Western Himalayan Eclogites".FRONTIERS IN EARTH SCIENCE 9(2022):12. |
入库方式： OAI收割
来源：地质与地球物理研究所
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