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Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet
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
Source PublicationTECTONICS
2017
Volume36Issue:1Pages:108-136
DOI10.1002/2016TC004334
AbstractThe 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.
Subject Area地质学
WOS IDWOS:000395098100005
Language英语
Indexed BySCI
KeywordINDIA-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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics ; Geochemistry & Geophysics
Cooperation Status国际
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8394
Collection图书馆
Corresponding AuthorLaskowski, AK
Affiliation1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA.
2.Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China.
Recommended Citation
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.
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