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Early Triassic Volcanic Rocks in the Western yarlung zangbo suture zone:Implications for the Opening of the Neo-Tethys Ocean

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 324-336页

作者： HE Juan LI Yalin HOU Yunling ZHOU Aorigele WEI Yushuai CHEN Xi DAI Jingen School of Civil Engineering and Architecture West Yunnan University of Applied SciencesDaliYunnan 671006China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100080China West Yunnan University of Applied Sciences DaliYunnan 671006China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100080China

In this study,zircon U-Pb dating of volcanic rocks from the Zhongba ophiolite of the yarlung zangbo suture zone(YZSZ)in southern Xizang(Tibet)yielded an age of 247±3 *** to whole rock geochemical and Sr-NdPb isotopic data,the Early Triassic samples could be divided into two groups:Group 1 with P-MORB affinity,showing initial^(87)Sr/^(86)Sr ratios of 0.70253–0.70602,ε_(Nd)(t)values of 4.2–5.3,(^(206)Pb/^(204)Pb)_(t)ratios of 16.353–18.222,(^(207)Pb/^(204)Pb)_(t)ratios of 15.454–15.564,and(^(208)Pb/^(204)Pb)_(t)ratios of 35.665–38.136;Group 2 with OIB affinity,showing initial^(87)Sr/^(86)Sr ratios of 0.70249–0.70513,ε_(Nd)(t)values of 4.4–4.9,(^(206)Pb/^(204)Pb)_(t)ratios of 17.140–18.328,(^(207)Pb/^(204)Pb)_(t)ratios of 15.491–15.575,and(^(208)Pb/^(204)Pb)_(t)ratios of 36.051–*** 2 rocks formed by partial melting of the mantle source enriched by a former plume,and assimilated continental crustal material during melt *** formation of Group 1 rocks corresponds to the mixing of OIB melts,with the same components as Group 2 and *** Zhongba Early Triassic rocks belong to the continental margin type ophiolite and formed in the continental–oceanic transition zone during the initial opening of the Neo-Tethys in southern Xizang(Tibet).

关键词： rift Early Triassic magmatism yarlung zangbo suture zone Neo-Tethys Southern Xizang Tibet

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Timing and mechanism of opening the Neo-Tethys Ocean:Constraints from mélanges in the yarlung zangbo suture zone

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Science China Earth Sciences 2023年第12期66卷 2807-2826页

作者： Tong LIU Chuanzhou LIU Fuyuan WU Wenbin JI Chang ZHANG Weiqi ZHANG Zhenyu ZHANG State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 10029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Geology Northwest UniversityXi'an 710069China

The evolution and final closure of the Neo-Tethys Ocean are one of the most important geological events that have occurred on Earth since the ***,the evolution of the Neo-Tethys is not well constrained,in particular whether its opening occurred in the Permian or the Triassic and whether a plume was involved with its opening or *** this study,we present geochronological and geochemical data for mafic igneous rocks in mélanges along the yarlung zangbo suture zone(YZSZ)in southern Tibet to constrain the timing and mechanism of opening the Neo-Tethys *** on field observations,the YZSZ mélanges can be divided into three *** western(west of Zhongba)and eastern(Sangsang-Renbu)segments are composed of ocean plate stratigraphy representing accretionary complexes that formed during subduction of Neo-Tethyan oceanic lithosphere beneath the southern margin of the Asian continent.Mélanges in the central segment(Zhongba-eastern Saga)typically have a siliciclastic matrix,and represent Tethyan Himalayan strata that were structurally mixed with the southern margin of the Asian *** on our and previously published geochemical data,the mafic rocks in the YZSZ mélanges are ocean island basalt(OIB)-like,with ages in the Late Permian-Middle Triassic,the Middle-Late Jurassic,and the Early Cretaceous,*** OIB-like block with an age of ca.253 Ma is identified from the Zhongba mélanges in the western segment,and it is the oldest OIB lithology yet identified in the YZSZ mélanges related to the evolution of the Neo-Tethys *** features indicate that this OIB-like block is distinct from typical OIBs and would be formed during continental rifting to incipient seafloor *** the framework of plate divergent-convergent coupling systems and based on literature data for early Middle Triassic seamounts,radiolarian cherts,and normal mid-ocean ridge basalt-like oceanic crust,we conclude that opening of the yarlung zangbo Neo-Tet

关键词： Neo-Tethys Ocean Wilson Cycle yarlung zangbo suture zone Mélange Ocean island basalt Tethyan geodynamics

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Recognition of trench basins in collisional orogens:Insights from the yarlung zangbo suture zone in southern Tibet

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Science China Earth Sciences 2020年第12期63卷 2017-2028页

作者： Xiumian Hu Wei An Eduardo Garzanti Qun Liu Institute of Continental Geodynamics State Key Laboratory for Mineral Deposits ResearchSchool of Earth Sciences and EngineeringNanjing UniversityNanjing210023China School of Resources and Environmental Engineering Hefei University of TechnologyHefei230009China Department of Earth and Environmental Sciences Universitàdi Milano-BicoccaMilano20126Italy

Trench basin,as an important sedimentary repository in oceanic subduction zones,documents faithfully the evolution of paleodrainage and paleogeographic *** of the frequent intense deformation during and after deposition,the recognition of trench-basin strata in orogenic belts is quite *** trench-fill deposits have been identified from the yarlung zangbo suture in southern Tibet,which can be classified into two types based on major differences in formation timing and tectonic *** first type developed during subduction of the Neotethyan oceanic slab in the Cretaceous(e.g.,the Jiachala,Rongmawa,and Luogangcuo formations),and the second type developed during the initial stage of the India-Asia collision in the Palaeogene(e.g.,the Sangdanlin-Zheya formations).The former was originally deposited on the subducting oceanic crust and then accreted as tectonic slices into the subduction complex;the latter was deposited unconformably on the continental margin of the subducting Indian plate and then involved in the subduction complex during the continental *** lithologies of trench-basin fills include abyssal chert,siliceous shale,silty to sandy turbidites,debris flows deposits,and slump deposits without *** feeding these basins were chiefly from the uplifted terrane in the upper *** paper summarizes the geological features of trench basins developed in southern Tibet and proposes criteria for recognizing trench-basins in collisional orogens.

关键词： Trench basin.Provenance analysis yarlung zangbo suture zone Southern Tibet Cretaceous-Paleocene Himalayan orogen

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Petrological and Re-Os Isotopic Constraints on the Origin and Tectonic Setting of the Cuobuzha Peridotite, yarlung zangbo suture zone, SW Tibet, China

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 10-11页

作者： FENG Guangying YANG Jingsui Yildirim DILEK LIU Fei XIONG Fahui CARMA Institute of GeologyChinese Academy of Geological Sciences Department of Geology& Env.Earth Science Miami University

The yarlung zangbo suture zone（YZSZ）in southern Tibet includes the remnants of Neotethyan oceanic lithosphere and marks a major suture between the Indian Plate to the south and the Lhasa Terrane of Tibet to the north（Dupuis et al.,2005;Yang et al.,2011）.In the western part of the YZSZ,the Northern and the Southern sub-belts form two sub-parallel zones of mafic–ultramaficrockassemblageswithoverlapping crystallization ages（Xiong et al.,2011;Hebért et al.,2012;Liu et al.,2015）.The upper mantle section of the Cuobuzha ophiolite in the northern sub-belt of the yarlung–zangbo suture zone（YZSZ）in SW Tibet comprises mainly clinopyroxene（cpx）–rich and depleted *** in the cpx-harzburgites show lower Cr#values（12.6–15.1）than the spinels in the harzburgites（26.1–34.5）,and the cpx-harzburgites display higher heavy rare earth element concentrations than the depleted *** harzburgites have subchondritic Os isotopic compositions（0.11624–0.11699）,whereas the cpx-harzburgites have suprachondritic 187Os/188Os ratios（0.12831–0.13125）with higher Re concentrations（0.380-0.575 ppb）.The cpx-harzburgites plot in a Re ***2O3 diagram as a result of subsequent addition of Re following the last partial melting event that occurred during mid-ocean ridge melt evolution processes（Uysal et al.,2015）.Although these geochemical and isotopic signatures suggest that both peridotite types in the ophiolite represent mid-ocean ridge type upper mantle units,their melt evolution trends reflect different mantle *** cpx-harzburgites formed from low-degree partial melting（;%）of a primitive mantle source,and they weresubsequently modified by melt–rock interactions in a mid-ocean ridge *** depleted harzburgites,on the other hand,were produced by re-melting of the cpx-harzburgites,which later interacted with MORB-or island arc tholeiite（IAT）-like melts（Fig.1）possibly in a trench-distal backarc spreading *** new isotopic and geochemical data from the Cuob

关键词： Os yarlung zangbo suture zone China Re

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Tectonic Evolution of Neotethys Ocean: Evidence of Ophiolites and Ocean Plate Stratigraphy from the Northern and Southern belts in the Western yarlung zangbo suture zone, Tibet

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 30-30页

作者： LIU Fei YANG Jingsui LIAN Dongyang NIU Xiaolu FENG Guangying CARMA Key Laboratory of Deep−Earth Dynamics of Land and ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037 School of Earth Sciences and Engineering Nanjing UniversityNanjingJiangsu 210023

The yarlung zangbo suture zone(YZSZ)separates Indian plate and its northern passive margin units to the south from Eurasian plate and its active continental margin units of Xigaze forearc basin and Gangdese batholith to the north(Xu et al.,2015;Yang et al.,2015).The western YZSZ in southern Tibet is divided by the Zhongba terrane into the northern belt(NB)and southern belt(SB).Ophiolites in the NB are dismembered as ophiolitic mé***,cumulated gabbro,ocean plate stratigraphy(OPS)of seamount remnants and pelagichemipelagic sequence as blocks in serpentinite matrix are mainly observed,from west to east,in Dajiweng,Baer,Kazhan,Cuobuzha,Zhalai,*** in the SB are absent ophiolitic units of sheeted dikes and MORB-like pillow lavas,occur as much larger peridotite massifs(i.e.,Dongbo,400 km^2;Purang,650 km^2;Xiugugabu,700 km^2;Dangqiong,300 km^2)which are intruded by mafic dike swarms and overlain by volcanic sedimentary OPS(Liu et al.,2018).We propose that the SB mafic–ultramafic rocks and volcanic sedimentary OPS represent fragments of an early Cretaceous continental margin ophiolite whose magmatic evolution was influenced by 140–137 Ma plume magmatism(Liu et al.,2015;Zheng et al.,2019).Relics of Late Paleocene to very Early Eocene deep-marine basin were developed in Saga and Gyirong(Ding,2003;Li et al.,2018).In contract,the NB ophiolitic mélanges report a travel log of an oceanic plate ranging from Middle Triassic to Early Cretaceous.

关键词： ophiolite ocean plate stratigraphy yarlung zangbo suture zone Neotethys

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Remnants of a Middle Triassic Oceanic Lithosphere in the Western yarlung zangbo suture zone, Southern Tibet

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 34-34页

作者： LIU Qiang LIU Feng LI Hualiang ZONG Keqing XIANG Shuyuan China University of Geosciences HubeiWuhan 430074China East China University of Technology JiangxiNanchang 330013China

Discontinuous ophiolite suites along the yarlung zangbo suture zone(YZSZ)in southern Tibet representing remnants of the Neo-Tethyan oceanic lithosphere are considered to be formed between Late Jurassic and Early *** ophiolite or ophiolitic mélange(***)to reveal the initial evolution the Neo-Tethyan ocean within the YZSZ have rarely been documented so *** western YZSZ extending from the Saga to Ladakh area are composed of the northern ophiolitic subbelt,the Zhongba terrane and the southern ophiolitic *** this study,we document structural,petrological and geochronological data of mafic intrusions from the Mayoumu massif in the southern ophiolitic sub-belt of the western *** lithos-tectonic sub-units,the southern ophiolitic complex and the northern ophiolitic mélange,are recognized in the Mayoumu massif in terms of structural pattern and ***-ICP-MS zircon U-Pb dating of gabbro from the ophiolitic mélange yields an age of 243±1 Ma with zirconεHf(t)values of+7.9 to+*** samples of diabase samples from the ophiolite yield ages of 131±1 Ma and 124±1 Ma with zirconεHf(t)values ranging from+10.8 to+15.0 and+12.3 to+15.4,***,rare earth elements(REEs)patterns show that these mafic intrusions are similar to those of the normal mid-ocean-ridge basalt(N-MORB).Enrichment of fluidmobile elements(*** and Ba)and depletion of Nb,and Ta suggest that these intrusions were possibly originated from melting of a depleted mantle source influenced by subducted *** data strongly confirms that the Neo-Tethyan ocean between the Lhasa terrane and Gondwana had been existed since the Middle Triassic at *** ages of the two diabases from the ophiolitic complex reveal that mafic magma activities within the Neo-Tethyan ocean could be as a continuing process during 120–130 *** and preservation of older ophiolitic recorder during evolution of the Neo-Tethyan Ocean may be closely related to the occurrence

关键词： ophiolite ophiolitic mélange yarlung zangbo suture zone gabbro diabase Zhongba

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Mineral Chemistry and Geochemistry of Peridotites from the Zedang and Luobusa Ophiolites, Tibet: Implications for the Evolution of the Neo-Tethys

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Journal of Earth Science 2015年第6期26卷 893-910页

作者： Qiang Li Bin Xia Jianfeng Li Lianze Xia Qiangtai Huang Zhongyu Xia School of Marine Sciences Sun Yat-Sen University Qingdao Institute of Marine Geology Guang zhou Institute of Geochemistry Chinese Academy of Sciences Department of Earth Sciences Sun Yat-Sen University

We present a new dataset on platinum group elements（PGEs）, whole-rock major and trace elements, and mineral chemistry for the peridotites from the Zedang and Luobusa ophiolite suites, Tibet, in an attempt to better constrain the petrogenesis of the Zedang and Luobusa ophiolites and the tectonic evolution of the Neo-Tethys. Plots of chondrite-normalized PGE, PGE vs. Mg#, and PGE vs. Al_2O_3 suggest that the lherzolite and harzburgite from Zedang and Luobusa have similar PGE characteristics. The Zedang and Luobusa peridotites display U-shaped REE patterns and are enriched in some incompatible elements, indicative of melt-rock interaction. The PGE characteristics may be attributed to partial melting and heterogeneous melt-rock interaction. Mineral chemistry and whole rock major and trace elements data suggest that lherzolite and harzburgite from Zedang and Luobusa have similar geochemical properties. On the spinel Mg# vs. Cr# plot, the composition of the Zedang and Luobusa peridotites is consistent with both abyssal and subduction-zone peridotites. This study indicates that the Zedang and Luobusa peridotites have a similar origin and evolution path： they could have originated from a normal mid-ocean ridge environment and got refertilization in a supra-subduction zone setting.

关键词： Zedang-Luobusa ophiolite mantle peridotite PGE melt-rock interaction yarlung zangbo suture zone

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The Boninite-like Dolerites in the Xigaze Ophiolites, Tibet: Similar to the MORB-like Dolerites

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 73-75页

作者： YANG Shengbiao YANG Jingsui LI Yuan LI Ruibao Center for Advanced Research on the Mantle(CARMA) Key Laboratory of Deep-Earth Dynamics of Ministry of Land and ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037 School of Earth Sciences and Resources Chang’an UniversityXi’anShaanxi 710054

The Early Cretaceous Xigaze ophiolites(XO)exposed along the central segment of the more than 2000 km long yarlung zangbo suture zone in southern Tibet,preserved the structure of the upper mantle and oceanic crust,is interpreted as a definite record of Neo-Tethys oceanic *** evolution models of the XO have been proposed since the 1980s(Nicolas et al.,1981;Hébert et al.,2012;Maffione et al.,2015).However,the geodynamic environment of the XO whether at a MOR or SSZ remains *** key evidence for the identification of the SSZ ophiolite,the boninite-like dolerites from the XO are still controversial and poorly constraint(Chen et al.,2003;Bao et al.,2013;Dai et al.,2013).According to previous reports,dolerites were subdivided to MORB-like type and boninite-like type(Chen et al.,2003;Dai et al.,2013).Apart from high-SiO2(>52 wt%),high MgO(>8 wt%)and low-TiO2(<0.5 wt%),we found the boninite-like and MORB-like dolerites are indistinguishable in outcrop,mineral and *** are sills invaded into mantle sequence of the XO,with 50.35–56.80 wt%SiO2,0.32–1.19 wt%TiO2,7.39–8.89 wt%Fe2O3T,5.50–10.42 wt%MgO and Mg#of 0.49–***-like dolerites display trace element and REE patterns similar to those of most fore-arc or/and back-arc basalts from Izu-Bonin-Mariana(IBM),*** in large ion lithophile elements(LILEs,***,Rb,Ba,Pb,U)and depletion in high-field strength elements(HFSE,Nb,Ta)(Fig.1).Boninite-like dolerites resemble the MORB-like dolerites in trace elements and REE patterns,excepting for lower concentrations in REE,but distinct from the boninites discovered from the IBM or Troodos ophiolite(Fig.1c,d).Th in both dolerites deviate from the MORB array with negative slopes on the Th/Yb ***/Yb diagram(Fig.2a),suggesting constant subduction component added to the mantle source(Pearce et al.,1995).We chose depleted MORB source Mantle(DMM,Workman and Hart,2005)as the starting composition computing immobile element contents for primary melt

关键词： yarlung zangbo suture zone Xigaze ophiolite depleted mantle mid-ocean ridge

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Reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 36-36页

作者： LIU Tong WU Fuyuan LIU Chuanzhou ZHANG Chang JI Wenbin XU Yang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The nature(i.e., sub-oceanic, sub-arc or subcontinental) of ophiolitic mantle peridotites from the eastern Neo-Tethyan domain in southern Tibet has been hotly debated. This uncertainty limits our understanding of the history and evolution of the eastern Neo-Tethys Ocean. Here we present petrological, geochemical and Re-Os isotopic data for the mantle peridotites from the Dazhuqu ophiolite in the central segment of the yarlung zangbo suture zone, southern Tibet. Samples collected include both spinel lherzolites and spinel harzburgites. The lherzolites have spinel Cr~# [Cr/(Cr + Al), ~ 0.3–0.4] comparable to those of typical abyssal peridotites. In contrast, the harzburgites have spinel Cr~#(~0.3–0.7) overlapping with the ranges of both abyssal and fore-arc peridotites(Day et al., 2017;Parkinson and Pearce, 1998);two samples have spinel Cr~# higher than 0.6, which is probably ascribed to intense melt-rock interactions. Clinopyroxene trace element modeling indicates that the Dazhuqu mantle peridotites have experienced 0–6% garnetfacies melting followed by 10% –18% melting in the spinel stability field. This is similar to the degree of garnet-facies melting inferred for many abyssal peridotites(Hellebrand et al., 2002) and implies deep initial melting(> 85 km), which distinguishes the Dazhuqu mantle peridotites from fore-arc peridotites(commonly <80 km in origin). The Dazhuqu peridotites have unradiogenic 187 Os/188 Os of 0.11836–0.12922, which are commonly lower than the recommended value of primitive upper mantle(PUM)(Meisel et al., 2001). All but one samples yield relatively younger Re depletion ages(TRD = 0.06–0.81 Ga) with respect to the only one sample having an older TRD age of 1.66 Ga. Re-Os isotopes and highly siderophile element(HSE) compositions of the Dazhuqu peridotites are similar to those of abyssal peridotites(Day et al., 2017) and the Oman southern massifs(Hangh?j et al., 2010) but are distinct from noncratonic sub-continental lithospheric mantle(SCLM)

关键词： Neo-Tethys Ocean sub-oceanic mantle Re-Os isotope mantle peridotite Dazhuqu ophiolite yarlung zangbo suture zone

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