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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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New Discovery of Radiolarians in the Pomulong Mélange, Middle part of the Yarlung Zangbo Suture Zone, Tibet

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1139-1141页

作者： SUN Qian ji zhansheng WU Guichun WAN Xiaoqiao School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Chinese Academy of Geological Sciences Beijing 100037China Institute of Geology CAGSBeijing 100037China

Objective The Pomulong mélange was established in the regional geological survey of Lhaze County at the scale of 1:250000 by the Geological Survey Institute of Hubei Province.

关键词： Middle Radiolarians lange

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Conodont Biostratigraphy and Age Determination of the Lower-Middle Triassic Boundary in South Guizhou Province,China

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 408-420页

作者： YAO jianxin ji zhansheng WANG Liting WANG Yanbin WU Zhenjie LIU Dunyi WU Guichun ZHANG jianwei LI Suping Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Guizhou Bureau of Geology and Mineral Resources Guiyang 550004 China

The demarcation of the Lower-Middle Triassic boundary is a disputed problem in global stratigraphic research. Lower-Middle Triassic strata of different types, from platform to basin facies,are well developed in Southwest China. This is favorable for the study of the Olenekian-Anisian boundary and establishing a stratotype for the Qingyan Stage. Based on research at the Ganheqiao section in Wangmo county and the Qingyan section in Guiyang city, Guizhou province, six conodont zones have been recognized, which can be correlated with those in other regions, in ascending order as follows： 1, Neospathodus cristagalli Interval-Zone; 2, Neospathodus pakistanensis Interval-Zone; 3,Neospathodus waageni Interval-Zone; 4, Neospathodus homeri-N, triangularis Assemblage-Zone; 5,Chiosella timorensis Interval-Zone; and 6, Neogongdolella regalis Range-Zone. An evolutionary series of the Early-Middle Triassic conodont genera Neospathodus-Chiosella-Neogongdolella discovered in the Ganheqiao and Qingyan sections has an intermediate type named Neospathodus qingyanensis that appears between Neospathodus homeri and Chiosella timorensis in the upper part of the Neospathodus homeri-N, triangularis Zone, showing an excellent evolutionary relationship of conodonts near the Lower-Middle Triassic boundary. The Lower-Middle Triassic boundary is located at 1.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Qingyan section,whereas this boundary is located 0.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Ganheqiao section. There exists one nearly 6-m thick vitric tuff bed at the bottom of the Xinyuan Formation in the Ganheqiao section, which is usually regarded as a lithologic symbol of the Lower-Middle Triassic boundary in South China. Based on the analysis of high -precision and high-sensitivity Secondary Ion Mass Spectrum data ,the zircon age of this tuff has a weighted mean 206Pb/238U age of 239.0±2.9

关键词： L-M Triassic Qingyan Stage conodont biostratigraphy isotope chronology South China

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SHRIMP U-Pb dating and Hfisotopic analyses of zircons from the mafic dyke swarms in central Qiangtang area,Northern Tibet

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Chinese Science Bulletin 2009年第21期54卷 2279-2285页

作者： ZHAI QingGuo LI Cai WANG Jun ji zhansheng WANG Yong Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China College of Earth Sciences Jilin University Changchun 130061 China

In the "Central Uplift" of Qiangtang,Northern Tibet,a large scale of mafic dyke swarms extended in E-W *** SHRIMP U-Pb dating on two representative samples of diabase dyke yield weighted mean ages of 284 ± 3 Ma and 302 ± 4 Ma,respectively,suggesting they emplaced in the Late Carboniferous to Early *** 176Hf/177Hf ratios range from 0.282852 to 0.283041,with εHf(t) values of +12.1 to +12.2 and Hf modal(TDM) ages of ～440―460 *** data indicate that these mafic dykes were mainly derived from the depleted *** addition,geochemical data suggest that these mafic dyke swarms are ofintra-plate ***,the mafic dyke swarms represent products during the extensional process associated with the opening of the Paleo-Tethys Ocean in the area.

关键词：锆石SHRIMP 镁铁质岩墙群同位素分析中部地区羌塘 Pb 藏北平均年龄

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Late Pleistocene(MIS 2) climate change on the Northern Tibetan Plateau inferred from pollen and geochemical records from Lake Gomo Co

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 29-30页

作者： WANG Yong WANG Jun ji zhansheng ZHAI Qingguo XIAO Xuchang Institute of Geology Chinese Academy of Geological Sciences

Introduction A 405-cm sediment section GM02 from Gomo Co salt lake in the northern Tibetan Plateau was used to reconstruct climate changes during marine isotope stage(MIS)2,including the Last Glacial Maximum(LGM)and last

关键词： pollen geochemical MIS 2 Last Glacial Maximum Tibetan Plateau

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Distribution of the Permian Monodiexodina in Karakorum and Kunlun and its Geological Significance

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Acta Geologica Sinica(English Edition) 2009年第2期83卷 229-237页

作者： YAO jianxin WANG Naiwen XIAO Xuchang ji zhansheng WU Guichun WU Zhenjie LI Boqin WANG Jun WANG Yong ZHAI Qingguo Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Chang＇an University Xi＇an Shaanxi 712000 China

The Permian fusulinoidean genus Monodiexodina is widely distributed in east Tethys. The genus might be an important indicator for the northern margin of Gondwana in northwestern China, but this is disputed. Monodiexodina-bearing areas can be restored as in either northern or southern middle latitudes with a symmetrical distribution between a high latitudinal, cool/cold water climatic realm and a paleotropical, warm water realm. Permian strata bearing Monodiexodina in Karakorum, Muztag Pear, and Buka Daban Pear of the east Kunlun Mountains can be correlated with each other. Faunal analyses and the stratigraphical position of Monodiexodina-bearing strata indicate that both Karakorum, east Kunlun, and the Pamirs were formed in a cool temperate sea area of the northern hemisphere in middle latitudes during the Permian, rather than at the Gondwana margin.

关键词： Monodiexodina middle latitude symmetric distribution cool temperate sea area,Karakorum east Kunlun northern hemisphere

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Status of Stratigraphy Research in China

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1069-1081页

作者： YAO jianxin BO jingfang HOU Hongfei WANG Zejiu MA Xiulan LIU Fengshan HU Guangxiao ji zhansheng WU Guichun WU Zhenjie LI Suping GUO Caiqing LI Ya Key Laboratory of Stratigraphy and Paleontology Ministry of Land and Resources Institute of GeologyChinese Academy of Geological Sciences Beijing 100037 China Chinese Academy of Geological Sciences Beijing 100037 China China Geological Survey Beijing 100037 China

Scientific research and productive practice for earth history are inseparable from the accurate stratigraphic framework and time framework. Establishing the globally unified, precise and reliable chronostratigraphic series and geological time series is the major goal of the International Commission on Stratigraphy （ICS）. Under the leadership of the ICS, the countries around the world have carried out research on the Global Standard Stratotype-section and Points （GSSPs） for the boundaries of chronostratigraphic systems. In the current International Chronostratigraphic Chart （ICC）, 65 GSSPs have been erected in the Phanerozoic Eonothem, and one has yet been erected in the Precambrian Eonothem. Based on the progress of research on stratigraphy especially that from its subcommissions, the ICS is constantly revising the ICC, and will publish a new International Stratigraphic Guide in 2020. After continual efforts and broad international cooperation of Chinese stratigraphers, 10 GSSPs within the Phanerozoic Eonothem have been approved and ratified to erect in China by the ICS and IUGS. To establish the standards for strafigraphic division and correlation of China, with the support from the Ministry of Science and Technology, the National Natural Science Foundation of China and the China Geological Survey, Chinese stratigraphers have carried out research on the establishment of Stages in China. A total of 102 stages have been defined in the ＂Regional Chronostratigraphic Chart of China （geologic time）＂, in which 59 stages were studied in depth. In 2014, the ＂Stratigraphic Chart of China＂ was compiled, with the essential contents as follows： the correlation between international chronostratigraphy and regional chronostratigraphy of China （geologic time）, the distributive status of lithostratigraphy, the characteristics of geological ages, the biostratigraphic sequence, the magnetostratigraphy, the geological events and eustatic sea-level change during every geological stage.

关键词： Stratigraphy research process status China.

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中国地质学会“第四届野外青年地质贡献奖——金罗盘奖”评选揭晓

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地质论评 2020年第6期66卷 1734-1735页

作者：纪占胜不详

中国地质学会第四届"野外青年地质贡献奖——金罗盘奖"(以下称"金罗盘奖")评审会于2020年9月25日召开,评审结果在中国地质学会网站进行了公示。

关键词：中国地质学会评审结果评审会罗盘第四届青年地质

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中国地质学会第十届黄汲清青年地质科学技术奖公布

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地质论评 2021年第1期67卷 55-55页

作者： ji zhansheng 中国地质学会成果和人才评选处

根据《黄汲清青年地质科学技术奖基金章程》《黄汲清青年地质科学技术奖奖励条例》规定,中国地质学会于2020年7月1日启动了第十届黄汲清青年地质科学技术奖的评奖活动。经过候选人申报、院士或单位推荐、中国地质学会秘书处资格审查等环... 详细信息

根据《黄汲清青年地质科学技术奖基金章程》《黄汲清青年地质科学技术奖奖励条例》规定,中国地质学会于2020年7月1日启动了第十届黄汲清青年地质科学技术奖的评奖活动。经过候选人申报、院士或单位推荐、中国地质学会秘书处资格审查等环节,确定有效候选人91名。

关键词：中国地质学会科学技术奖黄汲清奖励条例资格审查评奖活动候选人第十届

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基于卷积神经网络的钱塘江涌潮潮时预报

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人民长江 2022年第12期53卷 83-87,103页

作者：姬战生张振林杭州市水文水资源监测中心浙江杭州310016

精准的钱塘江涌潮潮时预报对防潮安全管理、市民游客观潮、水资源开发利用、交通航运及涉水工程建设等具有重要意义。传统基于相似潮分析的经验预报方法无法精确分析一些短期随机性因子带来的影响,预报精度有一定的不确定性,因此提出了... 详细信息

精准的钱塘江涌潮潮时预报对防潮安全管理、市民游客观潮、水资源开发利用、交通航运及涉水工程建设等具有重要意义。传统基于相似潮分析的经验预报方法无法精确分析一些短期随机性因子带来的影响,预报精度有一定的不确定性,因此提出了一种基于二维卷积神经网络的钱塘江涌潮潮时预报方法。选择农历日期、风力风向、上游来水、江道地形、前日隔日时间差等影响因素作为特征向量构建特征集,利用二维卷积神经网络提取输入矩阵的特征信息,构建全连接神经网络钱塘江涌潮潮时预报模型。通过粒子群算法对参数寻优,实现钱塘江涌潮潮时隔日预报,并以钱塘江代表站仓前站2009~2017年涌潮预报成果进行验证。验证结果表明,基于卷积神经网络的钱塘江涌潮潮时预报模型具有较高的预报精度和可靠性。

关键词：钱塘江涌潮潮时预报深度学习卷积神经网络 BP神经网络

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