Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet
文献类型：期刊论文
| 作者 | Laskowski, AK (Laskowski, Andrew K.)1; Kapp, P (Kapp, Paul)1; Ding, L (Ding, Lin)2; Campbell, C (Campbell, Clay)1; Liu, XH (Liu, XiaoHui)2; Laskowski, AK |
| 刊名 | TECTONICS
 |
| 出版日期 | 2017 |
| 卷号 | 36期号:1页码:108-136 |
| 关键词 | INDIA-ASIA COLLISION XIGAZE FORE-ARC U-PB ZIRCON THICKENED CONTINENTAL-CRUST EAST-WEST EXTENSION SOUTHWESTERN TIBET TETHYAN HIMALAYA HIGH-PRESSURE THERMOCHRONOLOGIC CONSTRAINTS (U-TH)/HE THERMOCHRONOMETRY |
| DOI | 10.1002/2016TC004334 |
| 文献子类 | Article |
| 英文摘要 | The Lopu Range, located similar to 600km west of Lhasa, exposes a continental high-pressure metamorphic complex beneath India-Asia (Yarlung) suture zone assemblages. Geologic mapping, 14 detrital U-Pb zircon (n=1895 ages), 11 igneous U-Pb zircon, and nine zircon (U-Th)/He samples reveal the structure, age, provenance, and time-temperature histories of Lopu Range rocks. A hornblende-plagioclase-epidote paragneiss block in ophiolitic melange, deposited during Middle Jurassic time, records Late Jurassic or Early Cretaceous subduction initiation followed by Early Cretaceous fore-arc extension. A depositional contact between fore-arc strata (maximum depositional age 971Ma) and ophiolitic melange indicates that the ophiolites were in a suprasubduction zone position prior to Late Cretaceous time. Five Gangdese arc granitoids that intrude subduction-accretion melange yield U-Pb ages between 49 and 37Ma, recording Eocene southward trench migration after collision initiation. The south dipping Great Counter Thrust system cuts older suture zone structures, placing fore-arc strata on the Kailas Formation, and sedimentary-matrix melange on fore-arc strata during early Miocene time. The north-south, range-bounding Lopukangri and Rujiao faults comprise a horst that cuts the Great Counter Thrust system, recording the early Miocene (similar to 16Ma) transition from north-south contraction to orogen-parallel (E-W) extension. Five early Miocene (17-15Ma) U-Pb ages from leucogranite dikes and plutons record crustal melting during extension onset. Seven zircon (U-Th)/He ages from the horst block record 12-6Ma tectonic exhumation. JurassicEocene Yarlung suture zone tectonics, characterized by alternating episodes of contraction and extension, can be explained by cycles of slab rollback, breakoff, and shallow underthrustingsuggesting that subduction dynamics controlled deformation. |
| 学科主题 | 地质学 |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000395098100005 |
| 源URL | [http://ir.itpcas.ac.cn/handle/131C11/8394]  |
| 专题 | 青藏高原研究所_图书馆 |
| 通讯作者 | Laskowski, AK |
| 作者单位 | 1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA. 2.Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Laskowski, AK ,Kapp, P ,Ding, L ,et al. Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet[J]. TECTONICS,2017,36(1):108-136. |
| APA | Laskowski, AK ,Kapp, P ,Ding, L ,Campbell, C ,Liu, XH ,&Laskowski, AK.(2017).Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet.TECTONICS,36(1),108-136. |
| MLA | Laskowski, AK ,et al."Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet".TECTONICS 36.1(2017):108-136. |
入库方式： OAI收割
来源：青藏高原研究所
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