气候变化领域集成服务门户(CCPortal): Evidence for late Quaternary brittle deformation and back thrusting within the Indus Suture Zone, Ladakh Himalaya

CCPortal

DOI	10.1016/j.tecto.2020.228597
	Evidence for late Quaternary brittle deformation and back thrusting within the Indus Suture Zone, Ladakh Himalaya
	Kumar A.; Srivastava P.; Sen K.; Morell K.; Hazarika D.
发表日期	2020
ISSN	00401951
卷号	792
英文摘要	Although the tectonic evolution of the southern Himalaya has been extensively studied, relatively few studies have focused on potential neotectonic activity in the most hinterland part of Himalaya, north of the region that separates the southern edge of the Tibetan plateau from the peaks of the Higher Himalayan Range. Here we use a combination of new structural and geomorphic field data, Optically Stimulated Luminescence (OSL) chronology, as well as previously published seismicity and denudation rate dataset, to suggest that the Trans-Himalaya within the region of the Indus Suture Zone (ISZ) is neotectonically active. Based on fault gouge, tilted paleolake deposits, and the chronology of deformed fluvial gravels constrained by OSL dating, the present study provides evidence for the tectonic activity along the ISZ between 78 and 58 ka. The occurrence of two earthquakes of Mw ≥ 4.0 and the focal mechanism solution of a shallow focus earthquake (Mw: 3.0, depth ~ 8 km) near the town of Upshi, shows a pure thrust mechanism. We suggest that this earthquake was likely associated with the Upshi-Bazgo thrust, a major structure which separates the mid-Miocene Indus Molasse from the Cretaceous Ladakh Batholith. It is envisaged that the fault and fold systems in the Ladakh region such as the Upshi-Bazgo thrust originated due to (1) acceleration in the northward movement of Indian plate relative to the Eurasian plate, and (2) post-collisional shortening parallel to plate convergence. On account of this, the Eocene to Miocene post-collisional sedimentary sequences, such as the Indus Molasse, rode over the now-extinct Ladakh Arc, as it acted as a rigid body, and formed a system of backthrusts, which are neotectonically active. © 2020
关键词	Backthrust Himalaya Indus Suture Zone Luminescence dating Neo-tectonics
英文关键词	Faulting; Luminescence; Plates (structural components); Brittle deformation; Denudation rates; Eurasian plates; Optically stimulated luminescence; Plate convergence; Sedimentary sequence; Tectonic activity; Tectonic evolution; Earthquakes; brittle deformation; denudation; geochronology; luminescence dating; neotectonics; Quaternary; seismicity; structural geology; suture zone; tectonic evolution; thrust; China; Himalayas; Ladakh Himalayas; Qinghai-Xizang Plateau
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207797
作者单位	Wadia Institute of Himalayan Geology, 33, G.M.S. Road, Dehradun, 248 001, India; Department of Earth Science, University of California, Santa Barbara, 1006 Webb Hall, Santa Barbara, CA 93106, United States
推荐引用方式 GB/T 7714	Kumar A.,Srivastava P.,Sen K.,et al. Evidence for late Quaternary brittle deformation and back thrusting within the Indus Suture Zone, Ladakh Himalaya[J],2020,792.
APA	Kumar A.,Srivastava P.,Sen K.,Morell K.,&Hazarika D..(2020).Evidence for late Quaternary brittle deformation and back thrusting within the Indus Suture Zone, Ladakh Himalaya.Tectonophysics,792.
MLA	Kumar A.,et al."Evidence for late Quaternary brittle deformation and back thrusting within the Indus Suture Zone, Ladakh Himalaya".Tectonophysics 792(2020).