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New insights on the age of the Mengyejing Formation in the Simao Basin,SE Tethyan domain and its geological implications

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Science China Earth Sciences 2021年第2期64卷 231-252页

作者： maodu yan Dawen ZHANG Xiaomin FANG Weilin ZHANG Chunhui SONG Chenglin LIU Jinbo ZAN Miaomiao SHEN Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China College of Tourism and Environmental Resource Zaozhuang UniversityZaozhuang 277160China University of Chinese Academy of Sciences Beijing 100049China School of Earth Sciences Key Laboratory of Western China’s Mineral Resources of Gansu ProvinceLanzhou UniversityLanzhou 730000China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

Knowledge on the origin and mechanism of the large potash formation in the southeast Tethyan tectonic domain are still under debate,one of which mainly due to the controversial ages of the potash-bearing *** we present a detailed detrital zircon U-Pb geochronologic-magnetostratigraphic study of the potash-bearing Mengyejing(MYJ)Formation(Fm)from the Simao Basin.948 paleomagnetic cores and 4 detrital zircon U-Pb samples were collected from a 932-m thick Jiangcheng *** demagnetization isolated 857 primary characteristic remnant magnetization(ChRM)directions,indicated by positive reversals and fold tests and petrologic *** normal and seven reversed polarity zones were identified and correlated well with chrons C27r to C34n of the geomagnetic polarity timescale(GPTS2012),yielding the first known age sequence of>112 to~63 Ma for the MYJ *** ages for the potash bearing strata in the Simao commenced~20 Ma earlier than those in the adjacent Khorat basins,opposite to the traditional viewpoint that the former would rather correspond to the middle and lower parts of the *** the paleogeographic reconstruction of likely a pan-Simao-Khorat basin during the Cretaceous,~85 Ma would be another important potential period for future potash exploration in the Simao Basin.

关键词： Simao Basin Magnetostratigraphy Potash-bearing sequence Mengyejing Fm >112–~63 Ma Potash formation

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Paleomagnetic dating of the Jiuquan Gravel in the Hexi Corridor:Implication on mid-Pleistocene uplift of the Qinghai-Tibetan Plateau

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Chinese Science Bulletin 2001年第23期46卷 2001-2005页

作者： ZHAO Zhijun FANG Xiaomin LI Jijun PAN Baotian yan maodu SHI Zhengtao Department of Geography Lanzhou UniversityLanzhou 730000China Faculty of Geography Nanjing Normal UniversityNanjing 210097China

The sediments in the foreland basins around the Qinghai-Tibetan Plateau preserved crucial information to reveal its tectonic history. In the Hexi Corridor, north periphery of the Qinghai-Tibetan Plateau, the angular unconformity between the Jiuquan Gravel and the Yumen Conglomerate has been well known to represent an intensive tectonic event of the plateau. However, its age is poorly constrained. Our paleomagnetic dating at the Laojunmiao section in the Jiuxi Basin show that the bottom of the Jiuquan Gravel reaches 0.84 MaBP, the top of the Yumen Conglomerate is about 0.93 MaBP. This result clearly demonstrates that the northern Qinghai-Tibetan Plateau experienced an intensive movement at mid-Pleistocene.

关键词： Hexi Corridor Jiuquan Gravel Yumen Conglomerate.

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Loess in the Tian Shan and its implications for the development of the Gurbantunggut Desert and drying of northern Xinjiang

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Chinese Science Bulletin 2002年第16期47卷 1381-1387页

作者： FANG Xiaomin SHI Zhentao yanG Shengli yan maodu LI Jijun JIANG Ping’an National Laboratory of Western China’s Environmental Systems of Ministry of Education of China&Department of Geography Lanzhou UniversityLanzhou 730000China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710054China Institute of Cold and Arid Region&Environment and Engineering of Chinese Academy of Sciences Lanzhou 730000China Department of Geological Sciences University of MichiganAnn ArborMI 48103USA School of Agriculture Xinjiang Agriculture UniversityUrumqi 830000China

Eolian loess is widely distributed on the various geomorphic surfaces between 700-2400 m a.s.l. on the northern slope of the Tian Shan. It is formed in a synchronous manner with dust transported from the Gurbantunggut Desert in the Junggar Basin. The thickest section of loess was found in the Shawan and Shihezi regions. Paleomagnetic and climatic proxy analyses of over 71 m of a loess-paleosol sequence on the highest terrace of the Qingshui He (River) in the Shawan show that the paleomagnetic Bruhues/Matuy-ama (B/M) boundary lies at the bottom of paleosol S8, at a depth of 69.5 m, and the bottom of the sequence was estimated to be -0.8 Ma. This implies that the extremely dry climatic conditions in the Junggar Basin and the initial Gurbantunggut Desert were present at least by 0.8 Ma. High-resolution grain size series demonstrate that this area and desert expansion experienced two dramatic periods of desert expansions that occurred at -0.65 Ma and 0.5 Ma, respectively; and the subsequent continuous

关键词： Tian Shan loess Gurbantunggut Desert aridification global change.

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Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation,Qiangtang Basin：Evidence from Geochemistry Records

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 156-174页

作者： SONG Chunhui ZENG Yongyao yan maodu FANG Xiaomin FENG Ying PAN Jiaqiu LIU Xifang MENG Qingquan HU Chunhua ZHONG Sirui School of Earth Sciences ＆ Key Laboratory of Western China's Mineral Resources of Gansu Province Lanzhou University Lanzhou 730000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences ＆ Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese of Academy of Sciences Beijing 100101 China Lanzhou Resources ＆ Environment Voc-Tech College Lanzhou 730000 China Institute of Mineral Resources Chinese Academy of Geological Sciences ＆ Key Laboratory of Saline Lake Resources and Environment Ministry of Land and Resources Beijing 100037 China

The Qiangtang Basin（QB）, located in the central Tibetan Plateau, is a Jurassic marine basin and one of the most important prospective salt resource belts in China. In recent decades, many outcrops of gypsiferous bed have been found in the Jurassic marine strata in the basin. Salt springs with abnormally high sodium（Na-＋） contents had been identified in the Late Jurassic Xiali Formation（Fm.） in the basin in the last years. However, to date, no potash or halite deposits have been identified in the QB. Gypsum outcrops and salt springs are very important signs in the investigation of halite and potash deposits. Therefore, the Xiali Fm. is a potentially valuable layer to evaluate for the possible presence of halite and potash deposits in the basin. However, few studies have explored the formation conditions of evaporites in the unit. Here, we present detailed geochemical records from the yanshiping section related to the study of the formation conditions of evaporites in the Xiali Fm. of the QB. Climate proxies based on the obviously increased anion concentrations of SO4（2-） and Cl-- and the significant correlation coefficients of Ca2＋-SO42-（R = 0.985） and Na-＋-Cl--（R = 0.8974） reveal that the upper member of the Xiali Fm.（the upper Xiali Fm.） formed under an arid climate and evolved into the sulfate phase or early chloride phase. Provenance proxies based on the obviously increased K-＋ and Na-＋ ion concentrations and the significant correlation coefficient of Na-＋-Cl--（R = 0.8974） suggest that the upper Xiali Fm. featured optimal provenance conditions for the possible formation of halite deposits. The regression and the semi-closed tidal flat environment in the upper Xiali Fm. were favorable for the formation of potash and halite deposits. The low Mg-（2＋） /Ca-（2＋） values（mean value = 1.82） and significant Na-＋-Cl-- correlation coefficient（R = 0.8974） also suggest that the upper Xiali Fm. is the layer most likely to contain potential halite deposits. In addition, the macr

关键词： Evaporites geochemistry Late Jurassic Xiali Formation Qiangtang Basin

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Late Neogene magnetostratigraphy in the western Qaidam Basin(NE Tibetan Plateau) and its constraints on active tectonic uplift and progressive evolution of growth strata

Late Neogene magnetostratigraphy in the western Qaidam Basin...

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2014年中国地球科学联合学术年会——专题42：古地磁...

作者： Weilin Zhang Xiaomin Fang maodu yan Institute of Tibetan Plateau Research Chinese Academy of Science

The Qaidam Basin as the largest intermontane basin of the NE Tibetan Plateau is the ideal place to provide constraints on depositional and tectonic patters. To determine its tectonic deformation history and progressive evolution of growth strata we conducted paleomagnetic study on the late-Neogene stratigraphic section in the western Qaidam Basin. A magnetostratigraphic study of the well exposed 805 m Qigequan section at the Qigequan anticline in the western Qaidam Basin reveals twelve pairs of normal and reversed polarity zones which can be readily correlated with chrons 1n-3Ar of the Geomagnetic Polarity Time Scale(GPTS). From this correlation we can conclude that the Shizigou and the Qigequan formations were formed at >6.9 Ma-2.5 Ma and 2.5-.4 Ma, respectively. Sedimentation rates determined from our chronology, together with the occurrence of unconformities suggest four phases of tectonic uplift which began at about 3.6 Ma, 2.5 Ma, 1.1 Ma and 0.8 Ma. The results also suggest that offlap growth strata according to the limb rotation model on the anticlinorium started to occur at .2 Ma. They progressively become younger from the frontal region of the Altyn Mts.(.2 Ma) to the southwestern basin(.5 Ma) and to further east of the Qaidam Basin(<2.5 Ma), caused by fault-propagation-folding in the Qaidam Basin, rapid uplift and fast exhumation of the NE Tibetan Plateau at those times.

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晚始新世古红河流域变化：来自思茅盆地早新生代地层碎屑锆石U-Pb年代学证据

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第四纪研究 2018年第1期38卷 130-144页

作者：颜茂都陈毅中国科学院青藏高原研究所大陆碰撞与高原隆升实验室北京100101 中国科学院青藏高原地球科学卓越创新中心北京100101 中国科学院大学北京100049

青藏高原东南部地区新生代时期是否存在一个连接青藏高原与南海的大陆规模古水系系统一直广受争议。本文以红河南侧云南思茅盆地为研究区，通过对盆地内古新世-渐新世地层的沉积学和碎屑锆石U—Pb年龄谱分析，并与邻区已有相关结果对比... 详细信息

青藏高原东南部地区新生代时期是否存在一个连接青藏高原与南海的大陆规模古水系系统一直广受争议。本文以红河南侧云南思茅盆地为研究区，通过对盆地内古新世-渐新世地层的沉积学和碎屑锆石U—Pb年龄谱分析，并与邻区已有相关结果对比分析，以揭示古水系的演化。结果表明：古新世一晚始新世等黑组砂岩的碎屑锆石u—Pb年龄谱展示出190—240Ma、260—280Ma、450—540Ma、1700—1900Ma和2400—2600Ma等多年龄组的组合特征，而晚始新世-渐新世勐腊组砂岩碎屑锆石U—Pb年龄谱表现出一个显著高峰年龄谱，集中在220—240Ma。等黑组碎屑锆石年龄谱与邻区的可可西里、松潘-甘孜、北羌塘、义敦和扬子西部碎屑锆石年龄谱具有可比性，与区域地层、岩相古地理证据共同指示古新世-晚始新世存在连接青藏高原与南海的古红河水系。勐腊组不同年龄峰值区间数量的减少说明物源区明显缩小，其年龄组与思茅盆地西侧的临沧花岗岩的年龄较为接近，指示其可能物源为临沧花岗岩，表明晚始新世-渐新世期间古红河失去了其北部上游大部分流域。综合古高度与区域构造等地质学证据，我们推测晚始新世期间，青藏高原东南部地区响应印度-欧亚板块碰撞开始发生红河断裂左行走滑和兰坪-思茅地块顺时针旋转等，导致连接青藏高原与南海的古红河水系失去了其上游的大部分流域，现代红河格局形成。

关键词：思茅盆地早新生代碎屑锆石U—Pb年代古红河印度-欧亚碰撞

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The Drifting History of the China Main Blocks during Specific Periods and their Tectonic Constraints on Marine Potash Formation

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 272-272页

作者： yan maodu ZHANG Dawen The CAS Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research CAS

1 Introduction Most of the world well know potash mines are deposited in marine *** the serious potash shortage,no significant progress has been made in marine potash in China,while the terrestrial potash

关键词： The Drifting History of the China Main Blocks during Specific Periods and their Tectonic Constraints on Marine Potash Formation

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Intensified tectonic deformation and uplift of the Altyn Tagh range recorded by rock magnetism and growth strata studies of the western Qaidam Basin, NE Tibetan Plateau

Intensified tectonic deformation and uplift of the Altyn Tag...

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2015中国地球科学联合学术年会

作者： Tao Zhang Wenxia Han Xiaomin Fang Weilin Zhang Chunhui Song maodu yan Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research CAS Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province

The Altyn Tagh range is the tectonically and geographically northern edge of the Tibetan Plateau,precise dating of its activities is essential for understanding the possible mechanisms of the Tibetan Plateau uplift and its effects on climate *** the framework of basin-mountain coupling,both magnetic susceptibility and rock magnetic research were carried out on the Late Cenozoic sediments of the Honggouzi section（7-5 Ma）in the western Qaidam *** study attempts to find out the evolution history of tectonic and climatic changes and to detect their interactions in the Altyn Tagh *** results showed that magnetic susceptibility records kept relatively low and stable values before0Ma,and rapidly increased since0 *** rock magnetic results revealed that paramagnetic minerals,maghemite and hematite have been dominated during the early periods（>10 Ma）in the Honggouzi section,and were replaced by magnetite and maghemite after that time.A detailed comparison of magnetic susceptibility records in the Honggouzi section with tectonic and climate records from the study areas and surrounding regions were also carried *** with sedimentary facies,lithology and angular unconformity in the sequence,as well as seismostratigraphy data,paleocurrent study,provenance and conceptual models analyses,we argue that the0 Ma shift in the HGZ section might be caused by the uplift of the Altyn Tagh range during that time.

关键词： Rock magnetism growth strata tectonic uplift Altyn Tagh range Qaidam Basin

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准噶尔盆地基底构造

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地学前缘 2021年第6期28卷 235-255页

作者： Xiaojun WANG Yong SONG Baoli BIAN Junmeng ZHAO Heng ZHANG maodu yan Shunping PEI Qiang XU Shuaijun WANG Hongbing LIU Changhui JU Xinjiang Oilfield Company PetroChinaKaramay 834000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China State Key Laboratory of Tibetan Plateau Earth System Science(LATPES) Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

我们已完成了穿越准噶尔盆地及其周边地区的I-I、II-II、III-III、IV-IV和额敏—哈密剖面5条综合地球物理剖面。通过综合研究,初步了解准噶尔盆地及邻近地区的地球动力学问题:准噶尔盆地基底由北部的乌伦古地体和南部的玛纳斯地体组成... 详细信息

我们已完成了穿越准噶尔盆地及其周边地区的I-I、II-II、III-III、IV-IV和额敏—哈密剖面5条综合地球物理剖面。通过综合研究,初步了解准噶尔盆地及邻近地区的地球动力学问题:准噶尔盆地基底由北部的乌伦古地体和南部的玛纳斯地体组成。两者的分界为西西北方向的滴水泉—三个泉缝合线。其西部与北东向Dalbutte缝合带相连,东部与北西向的Cranamary缝合带相连。准噶尔盆地北部的乌伦古地体基底为双层构造,上层为泥盆系和下石炭统组成的褶皱基底,大致表现为北厚(3~5 km)、南薄(1~2 km)。缝合线以南的玛纳斯地体为单层基底,即新元古代结晶基底。准噶尔盆地地壳厚度为44~52 km,北薄南厚。周边山区地壳厚度高于盆地地区。盆地及邻近地区地壳分为上、中、下层,并且中地壳一般较薄。盆地地区的地壳存在多条深断裂。南北方向发育了6条主要深断裂,分别为红车、德伦山、石溪、呼图壁、彩南和阜康。这些断层倾角较大,向上延伸至上地壳下部,向下切入地壳基底界面。壳内水平构造和构造面无明显垂向断层,似有“开放断层”特征。这些断层是上地幔物质挤入地壳的良好通道。此外,该地区还有两条主要的横向深断层。一是北西西走向的滴水泉—三个泉深断裂,它向南倾斜,具有逆断层性质,可能会破坏滴水泉—三个泉缝合带。另一条是近东西向的昌吉—玛纳斯深断裂,向南倾斜,主要发育在中下地壳,具有逆断层性质。这些深断裂对盆地构造发育具有一定的控制作用。准噶尔盆地西部的莫霍面基本连续地延伸到了天山的莫霍面,并且后者的莫霍面深度明显大于前者。但是,盆地东部的莫霍面与博格达山脉的莫霍面并不连续。前者以叠加关系延伸到后者之下,表明盆地东部的地壳向博格达山脉俯冲。这有助于解释天山东部构造活动相对减弱而博格达山脉向北推高的构造地貌现象。周边准噶尔盆地具有挤压盆地山地构造耦合格局,尤其是南部边界东部博格达—准东盆地的山地盆地构造耦合。现在将准噶尔盆地与吐哈盆地分开的博格达山脉是年轻的、仍在上升的山脉。博格达山的隆升是印支运动以来多次推覆造山运动的反映,其现貌是新近纪以来新构造运动的结果。准噶尔盆地盖层发育经历了3个阶段:与天山和松潘—甘孜造山带形成有关的二叠纪—三叠纪前陆盆地阶段,区域压缩较弱的侏罗纪—早始新世陆内坳陷阶段,以及新近纪晚期以来与天山抬升有关的活化前陆盆地阶段。

关键词：准噶尔盆地壳幔结构基底结构基底性质地球动力学过程

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柴北缘早新生代旋转变形特征及其构造意义

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地学前缘 2022年第4期29卷 249-264页

作者：栗兵帅颜茂都张伟林东华理工大学地球科学学院江西南昌330013 中国科学院青藏高原研究所青藏高原地球系统与资源环境国家重点实验室北京100101

青藏高原东北部作为高原北东向扩展的前缘地带,新生代以来变形十分强烈,是研究青藏高原隆升变形过程和生长模式的关键地区之一。然而高原东北部何时卷入印度-欧亚大陆碰撞挤压变形系统以及高原扩展的运动学、动力学过程和机制等仍存在... 详细信息

青藏高原东北部作为高原北东向扩展的前缘地带,新生代以来变形十分强烈,是研究青藏高原隆升变形过程和生长模式的关键地区之一。然而高原东北部何时卷入印度-欧亚大陆碰撞挤压变形系统以及高原扩展的运动学、动力学过程和机制等仍存在很大争议。大陆碰撞及持续挤压过程往往会伴随块体及其内部的旋转变形,而古地磁磁偏角可以定量恢复块体绕垂直轴发生的旋转变形,在研究块体旋转变形方面具有其独特优势。高原东北部,尤其是柴达木盆地,缺乏早新生代的细致旋转变形研究,制约了我们对高原东北部地区早新生代的旋转变形特征及其对印度-欧亚大陆碰撞远程响应的理解。柴北缘地区出露有近乎连续完整的早新生代路乐河组-下干柴沟组地层,为研究青藏高原东北部早新生代旋转变形提供了理想场所。本文对柴北缘逆冲带北中部的驼南和高泉两剖面早新生代路乐河组和下干柴沟组地层开展精细古地磁旋转变形研究:包括在驼南剖面布设4个时间节点、24个采点260个古地磁岩心样品,高泉剖面布设2个时间节点、14个采点150个古地磁岩心样品。通过系统岩石磁学和热退磁实验分析,揭示两剖面早新生代样品的载磁矿物主要是赤铁矿,并含有少量磁铁矿;所获得31个有效采点的高温特征剩磁方向通过褶皱检验和倒转检验,指示可能是岩石沉积时期记录的原生剩磁方向。结合柴北缘中部红柳沟剖面已有古地磁数据,三剖面古地磁结果一致表明柴北缘地区在45~35 Ma期间发生了显著(约20°)逆时针旋转变形。结合东部陇中盆地同时期古地磁旋转变形记录,发现二者具有反向的共轭旋转变形关系。综合青藏高原东部早新生代(52~46 Ma)旋转变形和渐新世以来走滑断裂活动等证据,我们认为:(1)高原东北部的共轭旋转变形是该地区对印度-欧亚碰撞的远程响应,其时间不晚于中始新世(约45 Ma);(2)早新生代自喜马拉雅东构造结至高原东北部,其两侧系统的共轭旋转变形很可能是该时期喜马拉雅东构造结北北东向压入欧亚大陆引起的右旋和左旋剪切作用导致,且剪切应力及相关的地壳缩短和旋转变形等呈现自东构造结地区沿北北东向逐步向高原东北部传递的特征;(3)古新世—始新世时期高原构造变形可能主要通过南北向挤压-地壳增厚模式、渐新世以来主要以沿主要断裂带的侧向挤出模式来调整。

关键词：青藏高原东北部古地磁旋转变形早新生代柴北缘喜马拉雅东构造结

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