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Triassic integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1152-1194页

作者： Guichun WU Zhansheng JI Gary GLASH qinggao zeng Jianxin YAO Key Laboratory of Stratigraphy and Palaeontology Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China SinoProbe Laboratory Chinese Academy of Geological SciencesBeijing 100094China Department of Geology and Environmental Sciences State University of New York-FredoniaFredoniaNY 14063USA Xizang Autonomous Region Geological and Mineral Exploration and Development Burea Lhasa 850010China

Rocks of the Qinghai-Tibetan Plateau(QTP)host abundant Triassic *** far,the well established marine fossil sequences based on ammonoids,conodonts,bivalves,brachiopods,radiolarians,and terrestrial spora-pollen sequence have become standard for biostratigraphic correlation of the *** much of Triassic time,the QTP occupied a marine setting as suggested by the dominance of marine *** main sedimentary types represented in the Triassic successions include littoral to shallow marine clastic rocks,shallow marine carbonate platform carbonates,bathyal to abyssal slope carbonates intercalated with clastic and siliceous deposits,coal-bearing clastic strata contained within paralic facies deposits,and littoral and terrestrial volcaniclastic *** deposits are organized into four stages in ascending order:(1)Early Triassic deposits that record marine transgression,including extensive shallow marine carbonate platform strata.(2)Middle Triassic Ladinian to Late Triassic Carnian deposits,including thin-bedded limestone,fine clastics,and siliceous rocks,that accumulated at greater depths than underlying Early Triassic strata and reflect the peak of the *** activity appears to have occurred in some areas during this stage.(3)Late Triassic Norian deposits that record the onset of marine regression as suggested by the widespread occurrence of platform *** is noteworthy that stage 3 deposits of the Qin-Qi-Kun area in the northernmost region of the QPT is dominated by terrestrial strata and displays evidence of local erosion.(4)Late Triassic Rhaetian littoral and shallow marine clastic and coal-bearing deposits that preserve the record of continued marine regression *** Indus-Yarlungzangbo Suture Zone(IYSZ)appears to have been the rifting axis during Triassic time as suggested by sedimentary facies trends that reflect deepening to south and ***,the Himalaya Block to the south of the IYSZ was part of the passive margin

关键词： Qinghai-Tibetan Plateau Triassic Biostratigraphy Lithostratigraphy Palaeobiogeography Sedimentary palaeogeography

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Late Jurassic oceanic plateau subduction in the Bangong-Nujiang Tethyan Ocean of northern Tibet

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Geoscience Frontiers 2024年第4期15卷 274-289页

作者： Hao Wu Haiyong Liu Yu Wang Xijun Liu qinggao zeng Panxi Wang Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration&Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources on Guangxi Guilin University of TechnologyGuilin 541006China Tibet Geological Survey Lhasa 850000China Tibet Bureau of Geological and Mineral Exploration and Development Lhasa 850000China

Oceanic plateau accretion and subsequent flat-slab subduction in modern convergent settings have profoundly influenced the nature of subduction and mantle ***,evaluating similar impacts in ancient convergent settings,where oceanic plateaus have been subducted but geological records are limited,remains *** this study,we present geochronological and geochemical data for a suite of ore-associated plutonic rocks from the Gaobaoyue area of northern *** rocks have zircon U-Pb ages of 152-146 Ma,with high Sr contents and Sr/Y and La/Yb ratios,low MgO,Yb,and Y contents,and depleted Sr-Nd-Hf isotopic compositions,consistent with an adakitic affinity that was generated by the partial melting of subducting oceanic *** compare the Late Jurassic adakitic magmatism with the spatiotemporal evolution of magmatism in northern Tibet to infer oceanic plateau subduction and subsequent flat-slab subduction in the Bangong-Nujiang Tethyan *** tectonic model explains(ⅰ)slab-derived adakitic magmatism,(ⅱ)the observed lull in magmatic activity,(ⅲ)intraplate compression and uplift,and(ⅳ)subduction jump and *** also propose that the subduction of heterogeneous oceanic crust(i.e.,buoyant oceanic plateau subduction)provided favorable conditions for tectonic exhumation,vertical slab tearing,and the formation of Cu-Au *** findings not only have implications for establishing the fundamental process of oceanic plateau accretion in ancient subduction zones but also provide an alternative explanation for Late Jurassic complex tectonomagmatic activity in north-ern Tibet.

关键词： Northern Tibet Adakitic magma Oceanic plateau Flat-slab subduction Vertical slab tearing

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Cretaceous integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1229-1289页

作者： Dangpeng XI Guobiao LI Shijun JIANG Xin RAO Tian JIANG Tianyang WANG Zuohuan QIN Yasu WANG Jianzhong JIA Muhammad KAMRAN Zhongye SHI Yuyang WU Panxi WANG Lixin SUN qinggao zeng Xiaoqiao WAN State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China College of Oceanography Hohai UniversityNanjing 213200China Key Laboratory of Palaeobiology and Petroleum Stratigraphy Nanjing Institute of Geology and PaleontologyChinese Academy of SciencesNanjing 210008China State Key Laboratory of Tibetan Plateau Earth System Environmentand Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China China National Offshore Oil Corporation Limited Beijing 100028China Shanghai Science and Technology Museum Shanghai 200120China Xizang Bureau of Geological and Mineral Exploration and Development Lhasa 850000China Tianjin Geological Survey Center of China Geological Survey Tianjin 300170China

The Cretaceous Period is a vital time interval in deciphering the evolutionary history of the Neo-Tethys Ocean and the convergence of different plates and blocks across the Qinghai-Tibetan Plateau.A detailed stratigraphic framework and paleogeographic patterns are the basis for understanding the evolution of the Neo-Tethys Ocean and the formation of the QinghaiTibetan ***,the Cretaceous stratigraphy,biota,paleogeography,and major geological events in the Qinghai-Tibetan Plateau are analyzed to establish an integrative stratigraphic framework,reconstruct the paleogeography during the Cretaceous Period,and decode the history of the major geological *** Cretaceous rocks of the Qinghai-Tibetan Plateau and its surrounding area are predominantly marine deposits,with a small amount of interbedded marine-terrestrial and terrestrial *** Indus-Yarlung Tsangpo Suture Zone was responsible for the deposition of deep marine sediments dominated by ophiolite suites and radiolarian *** the south,the Tethys Himalayas and Indus Basin received marine sediments of varying depths and lithology;to the north,the Xigaze and Ladakh forearc basins are also filled with marine *** Lhasa Block,Karakorum Block,western Tarim Basin,and West Burma block consist of shallow marine,interbedded marine-terrestrial,and terrestrial *** Qiangtang Basin and other areas are dominated by terrestrial *** Cretaceous strata of the Qinghai-Tibetan Plateau and its surrounding areas are widely distributed and diversified,with abundant foraminifera,calcareous nannofossils,radiolarians,ammonites,bivalves,and *** the basis of integrated lithostratigraphic,biostratigraphic,geochronologic,and chemostratigraphic analyses,we proposed herein a comprehensive stratigraphic framework for the Cretaceous Period of the eastern *** analyzing the Cretaceous biota of different biogeographic zones from eastern Neo-Tethys and its surrounding a

关键词： Qinghai-Tibetan Plateau Tethys Cretaceous Stratigraphy Biota Paleogeography

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四川盆地川中—川西过渡带中侏罗统沙溪庙组致密砂岩相对优质储层成因机制

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吉林大学学报（地球科学版） 2024年第2期54卷 371-388页

作者：宋林珂刘四兵曾青高周栋唐大海王锦西中国石油西南油气田公司致密油气勘探开发项目部成都610059 油气藏地质及开发工程国家重点实验室(成都理工大学) 成都610059

川中—川西过渡带沙溪庙组天然气勘探潜力巨大,是四川盆地近几年勘探的热点。目前,制约沙溪庙组致密砂岩天然气勘探开发的问题较多,其中,“相对优质储层”的形成机理和综合预测是亟需解决的关键问题之一。针对这一科学问题,本次研究通... 详细信息

川中—川西过渡带沙溪庙组天然气勘探潜力巨大,是四川盆地近几年勘探的热点。目前,制约沙溪庙组致密砂岩天然气勘探开发的问题较多,其中,“相对优质储层”的形成机理和综合预测是亟需解决的关键问题之一。针对这一科学问题,本次研究通过系统的物性分析、铸体薄片鉴定、扫描电镜分析以及储层地球化学分析等,开展了研究区沙溪庙组相对优质储层成因机制研究。研究结果表明:沙溪庙组致密砂岩以岩屑长石砂岩和长石岩屑砂岩为主。沙二段砂岩石英平均体积分数为35.27%,长石平均体积分数为35.37%,岩屑平均体积分数为29.36%,沙一段砂岩石英平均体积分数为37.79%,长石平均体积分数为24.01%,岩屑平均体积分数为38.20%,沙一段长石体积分数较高,沙二段岩屑体积分数较高。沙二段以变质岩岩屑为主(占岩屑体积分数的55%),沙一段则以岩浆岩岩屑为主(占岩屑体积分数的43%)。储层孔隙类型以原生孔为主,长石溶蚀孔为辅,沙一段具有相对更高比例的原生孔和裂隙孔。沙二段砂岩中38.00%的样品孔隙度大于12%,25.25%的样品渗透率大于1×10^(-3)μm^(2),沙一段砂岩仅3.09%的样品孔隙度大于12%,但41.22%的样品渗透率大于1×10^(-3)μm^(2)。总体表现为致密背景下发育一定的相对优质储层。其中沙二段储层孔隙度发育较好,而沙一段储层渗透性更佳,说明沙一段储层孔隙结构相对较好。沙溪庙组致密砂岩储层发育受控于岩矿组合-烃源体系-成岩系统。岩矿组合为成岩作用的演化提供物质基础,烃源体系决定溶蚀作用发育的强度,并为砂岩中主要自生矿物的沉淀提供必要的离子来源;成岩系统的开放程度则决定了体系内外离子的带进带出,进而影响了溶蚀作用和相应成岩产物的沉淀。沙二和沙一段砂岩岩矿组合的差异、沉积环境的不同、烃源体系以及成岩系统的开放程度是导致其成岩作用差异的主要原因。综上认为,高能沉积环境、早期保持性成岩作用(孔隙衬垫绿泥石)、多期次和多种类型的溶蚀作用以及局部微裂缝的发育改造,是研究区沙溪庙组相对优质储层发育的主要机制。

关键词：川中—川西过渡带沙溪庙组致密砂岩相对优质储层成因机制四川盆地

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西藏中部尼雄地区“敌布错组”安山岩夹层的发现及地质意义

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地质学报 2024年第6期98卷 1701-1714页

作者：刘海永唐菊兴王雨唐佐其张旭东叶强曾庆高孔明明西藏自治区地质调查院西藏拉萨850000 西藏地勘局第二地质大队西藏拉萨850000 中国地质科学院矿产资源研究所北京100037 贵州省地质调查院贵州贵阳550081 西藏自治区地质矿产勘查开发局西藏拉萨850000 西藏地勘局第六地质大队西藏拉萨850000

因缺乏高精度年代学制约,尼雄地区“敌布错组”形成时代及地层归属存在争议。本次工作通过对“敌布错组”安山岩夹层进行锆石U-Pb测年,获得~120 Ma的加权平均年龄,结合该区“敌布错组”碎屑锆石研究成果,表明其形成于早白垩世中晚期(130... 详细信息

因缺乏高精度年代学制约,尼雄地区“敌布错组”形成时代及地层归属存在争议。本次工作通过对“敌布错组”安山岩夹层进行锆石U-Pb测年,获得~120 Ma的加权平均年龄,结合该区“敌布错组”碎屑锆石研究成果,表明其形成于早白垩世中晚期(130~120Ma),与区域上则弄群火山-沉积地层形成时代一致,建议将其新厘定为则弄群。根据安山岩样品的全岩地球化学及锆石原位Hf同位素组成,认为其是壳源长英质岩浆与幔源玄武质岩浆混合的产物,形成于洋壳俯冲的构造环境。通过进一步对拉萨地体中、新生代岩浆作用的时空变换规律的总结分析,本文研究认为该套安山岩形成的动力学机制主要与新特提斯洋北向俯冲相关。

关键词：青藏高原尼雄地区安山岩岩石成因构造背景

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四川盆地川中地区侏罗系沙溪庙组致密砂岩气差异成藏特征及主控因素

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天然气地球科学 2024年第6期35卷 1014-1030页

作者：刘恒宇刘明洁肖尧曾青高宋林珂曹脊翔王锦西李唐律梁晨西南石油大学地球科学与技术学院四川成都610500 西南石油大学天然气地质四川省重点实验室四川成都610500 中国石油西南油气田分公司致密油气勘探开发项目部四川成都610056 中国石油西南油气田分公司开发事业部四川成都610000

四川盆地川中地区侏罗系沙溪庙组多期砂组气藏含气丰度以及同期砂组气藏富集程度均存在明显差异,严重制约着沙溪庙组致密砂岩气进一步勘探开发。通过对沙溪庙组致密砂岩天然气藏差异分布特征表征,综合分析烃源岩、储层、成藏期古构造、... 详细信息

四川盆地川中地区侏罗系沙溪庙组多期砂组气藏含气丰度以及同期砂组气藏富集程度均存在明显差异,严重制约着沙溪庙组致密砂岩气进一步勘探开发。通过对沙溪庙组致密砂岩天然气藏差异分布特征表征,综合分析烃源岩、储层、成藏期古构造、断-砂配置及演化等成藏要素,结合前人已有认识,认为川中地区沙溪庙组致密砂岩气差异成藏受控于天然气差异来源、优质储层、成藏期有利断-砂配置类型及古今有利断-砂配置演化,提出了“双烃源岩差异供烃,断-砂配置差异充注,优质储层差异富集,断-砂演化差异调整”的差异成藏演化模式。在该模式下,川中地区沙溪庙组气藏由须五段煤型气与大安寨段油型气“双源”供烃,研究区北东至南西表现为油型气-混合气-煤型气特征,气藏表现差异供烃;成藏期断层与缓倾角砂体对接((3)类)砂组气藏丰度优于断层与近水平砂体对接((1)类)砂组,气藏呈现差异充注;优质储层储集能力好并且富集程度高,气藏形成差异富集;继承保存型断-砂演化(Ⅰ型)气藏含气性最优,次为调整残留型(Ⅱ型),反转散失型(Ⅲ型)最差,气藏受到差异调整。

关键词：差异成藏致密砂岩气主控因素沙溪庙组川中地区

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Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau:Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture

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Acta Geologica Sinica(English Edition) 2010年第6期84卷 1461-1473页

作者： WANG Baodi CHEN Jianlin XU Jifeng WANG Liquan zeng qinggao DONG Yanhui Chengdu Institute of Geology and Mineral Resources Chengdu 610081 China Key Laboratory of Geochronology and Geochemistry Guanzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Regional Geological Surveying Party of the Tibet Bureau of Geology and Exploration Lhasa 851400 China The Second Institute ofOceangraphy SOA Hangzhou 310012 China

The Nadingcuo high-K calc-alkaline rocks mainly composed of trachyte and trachyandesite are the largest outcrop area of volcanic rocks in southern Qiangtang terrane in the Tibetan plateau. However,their exact source and peterogenesis are still debated.^（40）Ar-^（39）Ar and LAM-ICPMS zircon U-Pb isotopic dating confirm that these rocks erupted in *** addition,the Nadingcuo volcanic rocks are characterized by high Sr/Y content ratios,similar with the adakite derived from partial melting of oceanic *** can be further classified as high Mg~#（Mg~#=48-57） and low Mg~# （Mg~#=33-42） *** Nadingcuo adakitic rocks have relatively low（^（87）Sr/^（86）Sr）_i and highε_（Nd）（t）, showing a trend of similarity to the Dongcuo ophiolite present in the Bangong-Nujiang oceanic crust. Simple modeling indicates that the Nadingcuo adakitic rocks are a mix resulting from the basalt of Bangong-Nujiang Ocean with 10%-20%crustal material of Lhasa *** these bases we suggest that the low Mg~# Nadingcuo adakitic rocks are the product of partial melting of remnant oceanic crust with small sediment,and the high Mg~# rocks are the result of reaction between rising melt of remnant oceanic crust with subducted sediment and mantle ***,the origin of Nadingcuo adakitic rocks may be related to intracontinental subduction triggered by collision of India-Asia during Cenozoic.

关键词： intracontinental subduction adakitic rocks remnant oceanic crust Nadingcuo Qiangtang Tibetan plateau

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Ion implantation of semi-insulating InP materials

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Semiconductor Photonics and Technology 1995年第1期1卷 1-8页

作者： zeng qinggao(Chongqing Optoelectronics Research Institute,Yongchuan 632163,CHN)

The methods for protecting InP surface against degradation during annealing,including encapsulant and encapsulant-free techniques;rapid thermal annealing of InP implanted layers;implanted ion species and some profiles of typical dopants,etc.,they are all the key techniques concerning ion implantation into semi-insulating InP,and have been reviewed synthetically as well.

关键词： Ion Implantation Annealing Surface Treatment

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INVERSION OF STRIKE-SLIP MOVEMENTS ALONG THE YARLUNG ZANGBO SUTURE ZONE, TIBET

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地学前缘 2000年第S1期7卷 111-112页

作者： Kobayashi Kenta 1, Matsuoka Atsushi 2, Yang Qun 3, Nagahashi Toru 1, Takei Masahiko 1, zeng qinggao 4,Wang Yujin 3 (1 Graduate School of Science and Technology, Niigata University, Niigata 950\|2181, Japan 2 Department of Geology, Niigata Uni

Meso\| and microstructural characteristics of cataclastic fault rocks developed in the Xialu chert are described. The Xialu chert represents pelagic and deep marine sediments (Middle Jurassic—Lower Cretaceous), and occupies the southern marginal part of the E—W trending Yarlung Zangbo suture zone. The apparent total thickness of siliceous deposits exceeds 1km. The current study is concentrated along the two measured sections, Xialu\|E and Xialu\|W. The Xialu\|E section is composed mainly of red chert associated with reddish purple siliceous mudstone and greenish gray mudstone. The beds steeply dip north or south. The 45m section studied is divided into three units (chert unit, chert\|siliceous mudstone unit, and melange unit from north to south). They are in fault contact with each other. In the southern half of the chert unit and the northernmost of the chert\|siliceous mudstone unit, a 15m thick cohesive cataclasite zone can be defined. The cataclasites are composed of chert fragments in a fine grained matrix, and deformed with jigsaw puzzle structures. The chert\|siliceous mudstone unit is made up of four slabs of chert\|siliceous mudstone sequence. Mesoscopic duplex zones in thickness from 1 to 3m are recognized at slab boundaries. Flat and ramp structure and associated P foliations, R1 shears, Y surfaces are developed. Shear spacing range from 1 to 10cm. The slip senses are dextral strike\|slip movement along these duplex zones. The cataclasite zone is cut by the duplex zone along the southern boundary.

关键词： Tibet Yarlung Zangbo Suture Zone Xialu chert structural ana lysis fault rocks strike slip inversion

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西藏拉果错蛇绿混杂岩岩石学、锆石U-Pb年龄及地球化学特征

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地质通报 2020年第2期39卷 164-176页

作者：刘海永曾庆高王雨毛国正成都理工大学地球科学学院四川成都610059 西藏自治区地质调查院西藏拉萨850000 西藏自治区地质矿产勘查开发局西藏拉萨850000 西藏地勘局西勘集团西藏堆龙851400

拉果错蛇绿岩是青藏高原中部狮泉河-纳木错-嘉黎缝合带中出露最完整的蛇绿岩组合之一,对恢复和反演该缝合带代表的洋盆演化及洋盆性质具有重要的约束意义。以拉果错蛇绿岩中的辉长岩、辉绿岩、辉绿玢岩和斜长花岗岩为研究对象,在岩石学... 详细信息

拉果错蛇绿岩是青藏高原中部狮泉河-纳木错-嘉黎缝合带中出露最完整的蛇绿岩组合之一,对恢复和反演该缝合带代表的洋盆演化及洋盆性质具有重要的约束意义。以拉果错蛇绿岩中的辉长岩、辉绿岩、辉绿玢岩和斜长花岗岩为研究对象,在岩石学、锆石U-Pb年代学和全岩地球化学研究的基础上,探讨了拉果错蛇绿岩的成因和构造背景,以此约束狮泉河-纳木错-嘉黎缝合带的性质。结果显示,斜长花岗岩锆石U-Pb年龄为167.8±1.7 Ma(n=24,MSWD=0.22),表明拉果错蛇绿岩形成于晚侏罗世。地球化学特征显示,拉果错蛇绿岩中辉长岩与辉绿岩端元均兼具岛弧与富集洋中脊玄武岩的地球化学性质,指示其形成于大陆弧后盆地环境。

关键词：青藏高原拉果错蛇绿岩晚侏罗世弧后盆地锆石U-Pb定年

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