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| DOI | 10.1130/L544.1 |
| High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet | |
| Laskowski, Andrew K.; Kapp, Paul; Vervoort, Jeff D.; Ding, Lin | |
| 通讯作者 | Laskowski, AK (通讯作者) |
| 发表日期 | 2016 |
| ISSN | 1941-8264 |
| EISSN | 1947-4253 |
| 起始页码 | 574 |
| 结束页码 | 582 |
| 卷号 | 8期号:5 |
| 英文摘要 | This study documents an early Cenozoic continental high-pressure (HP) metamorphic complex along the Yarlung (India-Asia) suture zone in southern Tibet. The complex is exposed in the Lopu Range, located similar to 600 km west of the city of Lhasa. HP rocks in the core of the complex have Indian passive-margin (Tethyan Himalaya Sequence) protoliths and are exposed in the footwall of a top-to-the-north, normal-sense shear zone. Phengite geobarometry, Zr-in-rutile geothermometry, and pseudosection modeling indicate that these rocks reached pressures >= 1.4 GPa at temperatures <= 600 degrees C. A meta-Tethyan graywacke yielded a garnet Lu-Hf date of 40.4 +/- 1.4 Ma, which is interpreted as the age of prograde metamorphism. Five Ar-Ar phengite ages between 39 and 34 Ma are interpreted to record the timing of exhumation to midcrustal depths (similar to 25 km) and concomitant retrogression. The structural geometry and pressure-temperature-time (P-T-t) history of Lopu Range rocks are similar to the Tso Morari and Kaghan Valley complexes, located >700 km to the northwest along the Indus suture zone. However, peak metamorphism and exhumation occurred similar to 6 m.y. later in the Lopu Range, and no ultrahigh-pressure assemblages have been identified. We propose a tectonic model that involves steep subduction of the Tethyan Himalaya continental margin at ca. 40 Ma, initial exhumation of HP metasedimentary rocks at ca. 39 Ma, and subsequent northward underthrusting of Greater Indian lithosphere shutting off Gangdese arc magmatism at ca. 38 Ma. |
| 关键词 | CONTINENTAL SUBDUCTIONEXHUMATION HISTORYSOUTHWESTERN TIBETU-PBAR-40/AR-39ECLOGITESEVOLUTIONCOESITELADAKHGEOCHRONOLOGY |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Geology |
| WOS类目 | Geochemistry & Geophysics ; Geology |
| WOS记录号 | WOS:000390450700010 |
| 来源期刊 | LITHOSPHERE
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/258732 |
| 推荐引用方式 GB/T 7714 | Laskowski, Andrew K.,Kapp, Paul,Vervoort, Jeff D.,et al. High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet[J]. 中国科学院青藏高原研究所,2016,8(5). |
| APA | Laskowski, Andrew K.,Kapp, Paul,Vervoort, Jeff D.,&Ding, Lin.(2016).High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet.LITHOSPHERE,8(5). |
| MLA | Laskowski, Andrew K.,et al."High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet".LITHOSPHERE 8.5(2016). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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