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Burial and exhumation history of the xigaze forearc basin, Yarlung suture zone. Tibet

Geoscience Frontiers 2019年第3期10卷 895-908页

作者： Devon A.Orme Department of Earth Sciences Montana State University

The Cretaceous-Eocene xigaze forearc basin is a crucial data archive for understanding the tectonic history of the Asian continental margin prior to and following collision with India during the early Cenozoic Era. This study reports apatite and zircon(U-Th)/He thermochronologic data from fourteen samples from Albian-Ypresian xigaze forearc strata to determine the degree and timing of heating(burial) and subsequent cooling(exhumation) of two localities along the Yarlung suture zone(YSZ) near the towns of Saga and Lazi. Thirty-seven individual zircon He ages range from 31.5 ± 0.8 Ma to6.06 ± 0.18 Ma,with the majority of grains yielding ages between 30 Ma and 10 Ma. Twenty apatite He ages range from 12.7 ± 0.5 Ma to 3.9 ± 0.3 Ma,with the majority of grains yielding ages between 9 Ma and 4 Ma. These ages suggest that the xigaze forearc basin was heated to 140-200 ℃ prior to cooling in Oligocene-Miocene time. Thermal modeling supports this interpretation and shows that the samples were buried to maximum temperatures of ～140-200 0 C by 35-21 Ma, immediately followed by the onset of exhumation. The zircon He and apatite He dataset and thermal modeling results indicate rapid exhumation from ～21 Ma to 15 Ma, and at ～4 Ma. The 21-15 Ma thermochronometric signal appears to be regionally extensive, affecting all the lithotectonic units of the YSZ, and coincides with movement along the north-vergent Great Counter Thrust system. Thrusting, coupled with enhanced erosion possibly related to the paleo-Yarlung River, likely drove Early Miocene cooling of the xigaze forearc *** contrast, the younger phase of rapid exhumation at ～4 Ma was likely driven by enhanced rock uplift in the footwall of north-striking rifts that cross-cut the YSZ.

关键词： xigaze Tibet Forearc basin Thermochronology Yarlung

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Metamorphic Petrology of Clinopyroxene Amphibolite from the xigaze Ophiolite,Southern Tibet: P-T Constraints and Phase Equilibrium Modeling

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Journal of Earth Science 2019年第3期30卷 549-562页

作者： Yancheng Zhang Xu-Ping Li Guangming Sun Zeli Wang Wenyong Duan Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals College of Earth Science & EngineeringShandong University of Science and Technology

The clinopyroxene amphibolite from the Bailang terrane is located in the central section of the Yarlung Zangbo suture zone(YZSZ),southern *** study of it is expected to provide important clues for the subduction of the Neo-Tethyan Ocean below the Asian Plate and thus for better understanding of the development of the India-Asia collision *** on integrated textural,mineral compositional,metamorphic reaction history and geothermobarometric studies of the clinopyroxene amphibolite within a serpentinite mélange,four overprinted metamorphic stages are *** are the first metamorphic record of M1 stage indicated by a relict assemblage of plagioclase+clinopyroxene+amphibole,an early M2 stage characterized by an assemblage of medium-grained clinopyroxene+amphibole+plagioclase+quartz as well as rutile inclusion in titanite,which is formed during burial process,an isobaric cooling M3 stage which is characterized by an assemblage of clinopyroxene+amphibole+plagioclase+titanite,and a decomposing retrograde stage M4,which is represented by the amphibolite+plagioclase symplectite+titanite+rutile+*** applying the THERMOCALC(versions 6.2 and 6.3)technique in the NCFMASHTO system,the P-T conditions estimated from M1 to M4 stages are ca.8.6 kbar/880℃,10.8–13.4 kbar/800–840℃,12.7–13.2 kbar/650–660℃ andxigaze ophiolite,suggesting that the rocks underwent a cooling process during burial from magmatic protolith,and a decompressing stage after the pressure peak metamorphic conditions,which implies that the Bailang terrane of the xigaze ophiolite may have experienced subduction/collision-related tectonic *** peak metamorphism reaches to the transitional P-T conditions among amphibolite facies,granulite facies and eclogite facies with a burial depth of 30–40 *** exhumation of the ophiolitic unit

关键词： clinopyroxene amphibolite thermodynamic modeling P-T conditions counterclock P-T path Bailang terrane xigaze ophiolite Tibet

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CHRONOSTRATIGRAPHY,SEDIMENTATION AND EVOLUTION OF THE xigaze FOREARC BASIN: IMPLICATIONS FOR DYNAMIC EVOLUTION OF THE YARLUNG ZANGBO SUTURE ZONE

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地学前缘 2000年第S1期7卷 106-107页

作者： Wang Chengshan 1, Liu Zhifei 2,1 , Li Xianghui 1[WT5,5”BX](1 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China, E\|mail:wcs@*** 2 Laboratory of Marine Geology, Tongji University, Shanghai 200092

The Yarlung Zangbo Suture Zone (YZSZ), a major lineament in Tibet geological framework, which is accepted as the collision site between India and Asia (Allègre et al., 1984; Coulon et al., 1986; Dewey et al., 1990; Yin et al., 1994), is an extremely complicated tectonic zone. It includes seven different tectonic\|sedimentary units from north to south as follows: Gangdese arc complex keeping the Sangri Group inside, the Qiuwu Formation, the Giabulin Formation, the xigaze Group, ophiolitic massifs, the Liuqu Group, and melange zones (Wang et al., 1999). Current models, which mainly focus on researches at the unit of ophiolitic massifs, propose that most of the Tethyan oceanic lithosphere was subducted into one single subduction zone active during the Middle Cretaceous or the Late Cretaceous, and closed during the Paleogene India\|Asia collision. In this report, we present latest research results on units in the xigaze forearc basin and others in YZSZ after 6\|year\|period of comprehensive investigations. Chronostratigraphy framework, sedimentology, and evolution of the xigaze forearc basin are discussed in details. Four thrust systems in YZSZ are named. Dynamic evolution of the YZSZ including two subductions of Tethys is presented.

关键词： submarine fan xigaze forearc basin Yarlung Zangbo Suture Zon e

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xigaze: Decade of Change

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China's Tibet 1996年第6期7卷 20-22页

作者： SOINAM DAGYI

Ｘｉｇａｚｅ：Ｄｅｃａｄｅ　ｏｆ　ＣｈａｎｇｅＸｉｇａｚｅ：ＤｅｃａｄｅｏｆＣｈａｎｇｅ￥ＳＯＩＮＡＭＤＡＧＹＩＸｉｇａｚｅ，ｔｈｅｓｅｃｏｎｄｌａｒｇｅｓｔｃｉｔｙｉｎＴｉｂｅｔｌｏｃａｔｅｄｏｎｔｈｅｎｏｒｔｈｅ... 详细信息

Ｘｉｇａｚｅ：Ｄｅｃａｄｅ　ｏｆ　ＣｈａｎｇｅＸｉｇａｚｅ：ＤｅｃａｄｅｏｆＣｈａｎｇｅ￥ＳＯＩＮＡＭＤＡＧＹＩＸｉｇａｚｅ，ｔｈｅｓｅｃｏｎｄｌａｒｇｅｓｔｃｉｔｙｉｎＴｉｂｅｔｌｏｃａｔｅｄｏｎｔｈｅｎｏｒｔｈｅｒｎｓｌｏｐｅｓｏｆｔｈｅＨｉｍａ...

关键词： Decade of Change xigaze

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YARLUNG ZANGBO OPHIOLITES,SOUTHERN TIBET REVISITED

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地学前缘 2000年第S1期7卷 124-126页

作者： Hébert Réjean 1, G.Beaudoin 1,V.Varfalvy 1, F.Huot 2, Wang C.S. 3, Liu Z.F. 4(1 Département de Géo logie et de génie géologique , Université Lav al,Ste\|Foy, Qc,Canada, G1K 7P4, E\|mail:hebert@ggl.ulaval.ca 2 Institut universitaire euro

Field work conducted in September 1998 and Summer 1999 aimed to reassess the ophiolitic segment of the Yarlung Zangbo suture zone (YZS) and shed new light on the preserved fragments of Neo\|Tethys ocean\|floor. This eastern ophiolitic segment was partly surveyed during the 1980 Sino\|French Cooperative Investigation of Himalayas, but little work has been done since that time. Progress in ophiolite research field and new developments in modern ocean crust guided us in the recent field work investigation. Mantle peridotites and associated minor crustal units are assumed Early Cretaceous in age, while diabase interbedded with phyllites and radiolarian sediments of presumed seamount origin are attributed to Late Jurassic—Early Cretaceous age. Six different massifs were visited that are from west to east: Jiding, Qunrang, Beimarang, Dazhuqu, Luobusa, and Zedang. Each massif presents specific characteristics summarized below. The Jiding massif is made of partly to totally serpentinized granular upper mantle harzburgites with orthopyroxenite banding, a transitional Moho zone, a thick diabase sill\|dike complex intruded into heterogeneous gabbro, and pillow lavas.. High\|temperature plastic foliation, although generally oriented NW—SE, and lineation show folding. Numerous gabbroic and diabasic intrusions are observed in peridotites. The orientations of the mafic rocks foliation and lineation do not fit the structure of the host peridotites. The 350m thick transition zone is a syntectonically intrusive sequence of mantle peridotites cut by abundant different types of gabbro and diabase. In one case intrusion of gabbro postdates serpentinization of peridotites and the outer margin of the xenolith enclosed in fine\|grained gabbro has reacted to form pegmatitic hornblende gabbro. The crustal unit is made of gabbro intruded by multiple fine\|grained dikes. Hydrothermal circulation was locally intense and Cu mineralization and epidosite are observed close to shear *** Qunra

关键词： Yarlung Zangbo xigaze ophiolites mineral chemistry mantle heterogeneities

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OCEANIC DEPOSITS IN THE YARLUNG—TSANGPO SUTURE ZONE: STRUCTURAL SETTING, RADIOLARIAN AGES AND THEIR TECTONIC IMPLICATIONS

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地学前缘 2000年第S1期7卷 118-118页

作者： S.V.Ziabrev 1,J.C.Aitchison 1,Badengzhu 2,A.M.Davis 1,H.Luo 1, J.Liu 1,I.McDermid 1,J.Malpas 1(1 Tibet Research Group, Dept. of Earth Science, University of Hong Kong,Pokfulam Rd., Hong Kong SAR, China 2 Geological Team No 2, Tibetan Bureau

The Yarlung—Tsangpo Suture Zone, the youngest in Tibet, marks a site of collision of the Eurasia continent and Indian subcontinent. It is characterised by a discontinuous line of ophiolitic bodies in southern Tibet and beyond. Fragments of Tethyan oceanic pelagic and hemipelagic deposits are distributed along the suture. These oceanic deposits occur in two distinctive tectonic settings: (1) above the ophiolite and (2) in fragments of an accretionary wedge that lies to the south of the ***\|ophiolite sequences, examined at several localities, are mostly made up of chert and siliceous mudstones and display varied lithostratigraphy. Sections are thin, have different degrees of completeness and are truncated at their tops. Most of them are in undisturbed stratigraphic contact with underlying pillow lava or pillow breccia. Previously the cherts above the ophiolite in this area were dated as late Albian\|possibly early Cenomanian (Marcoux et al., 1982) or early Cenomanian (Wu, 1986). Our investigation reveals Aptian radiolarian fossils in the cherts and siliceous mudstones. The oldest radiolarians, late Barremian, occur in chert at the base of the Qunrang section. This allows reassessment of the timing of eruption of xigaze ophiolite basalts to during, or before, the late Barremian—early Aptian.

关键词： Yarlung—Tsangpo Suture xigaze ophiolite accretionary wedge Radiolaria

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