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学科主题: 地球科学::地质学
题名: High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet
作者: Laskowski, AK (Laskowski, Andrew K.)1; Kapp, P (Kapp, Paul)1; Vervoort, JD (Vervoort, Jeff D.)2; Ding, L (Ding, Lin)3
通讯作者: Laskowski, AK
关键词: CONTINENTAL SUBDUCTION ; EXHUMATION HISTORY ; RUTILE THERMOMETER ; SOUTHWESTERN TIBET ; NW HIMALAYA ; U-PB ; ECLOGITES ; COLLISION ; GEOCHRONOLOGY ; AR-40/AR-39
刊名: LITHOSPHERE
发表日期: 2016
DOI: 10.1130/L544.1
卷: 8, 期:5, 页:574-582
收录类别: SCI
合作性质: 国际
文章类型: Article
部门归属: 碰撞与隆升
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.
语种: 英语
WOS记录号: WOS:000390450700010
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7538
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Univ Arizona, Dept Geosci, Gould Simpson Bldg,1040 E 4th St, Tucson, AZ 85721 USA
2.Washington State Univ, Sch Environm, POB 642812, Pullman, WA 99164 USA
3.Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, 4A Datun Rd, Beijing 100101, Peoples R China

Recommended Citation:
Laskowski, AK ,Kapp, P ,Vervoort, JD ,et al. High-pressure Tethyan Himalaya rocks along the India-Asia suture zone in southern Tibet[J]. LITHOSPHERE,2016,8(5):574-582.
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