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Journal of Earth Science 2024年第4期35卷 1367-1372页

作者： Shao-Yong Jiang Hailin Xie Wenqi Ren Bin Wang Feng Yuan Xiufeng Liu Hui-Min Su State Key Laboratory of geological Processes and Mineral Resources Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesSchool of Earth ResourcesChina University of GeosciencesWuhan 430074China qinghai Engineering Research Center of Deep exploration Technology for Large and Ultra-Large Gold Deposits around qaidam Basin First Geological Exploration Institute of Qinghai ProvinceHaidong 810600China

0 INTRODUCTION Chromium(Cr)is one of the most important strategic critical metals in *** primary chromite deposits can be divided into two types according to their geological setting and occurrences:podiform chromite and stratiform/layered chromite(Stowe,1994;Paktunc,1990).Podiform chromites mainly occur in ophiolites or mantle peridotites(Yang et al.,2022,2010;Bao et al.,1999).

关键词： China mantle setting

A local rainfall-triggered giant landslide occurred in a region along a high-speed railway on the qinghai‒Tibetan Plateau

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Journal of Mountain Science 2024年第9期21卷 2939-2955页

作者： LI Qingpeng LIU Wenhui HE Renjie YING Chunye LIU Hairui DOU Zengning LIU Yabing YANG Sha SONG Xianteng School of geological Engineering Qinghai UniversityXining 810016China Key Lab of Cenozoic Resource and Environment in North Margin of the Tibetan Plateau Qinghai UniversityXining 810016China College of Eco-Environmental Engineering Qinghai UniversityXining 810016China qinghai Transportation Planning and Design institute Co Ltd Xining 810000China Xining Center for integrated Natural Resources Survey China Geological SurveyXining 810000QinghaiChina

An increasing number of geological hazards along high-speed railways on the qinghai‒Tibetan Plateau have occurred and have resulted in a profound influence on old infrastructure,which has attracted increasing *** landslide event that occurred on September 15,2022,in Jiujiawan village,Xining city,qinghai province,is a typical *** on field investigations and remote sensing interpretations,a comprehensive analysis was conducted on the ***,the potential secondary failure of the current Jiujiawan landslide was assessed using Fast Lagrangian Analysis of Continua in Three Dimensions(FLAC3D).Based on the application of the small baseline subset-interferometric synthetic aperture radar(SBAS-InSAR)technique to SAR images from February 24,2017 to September 14,2022,a significant westward horizontal deformation was found to have been formed prior to the occurrence of the *** maximum annual average deformation rate in the line of sight(LOS)direction reached-45 mm/yr,with a maximum cumulative deformation of-178 *** value was consistent with the continual increase in annual precipitation(2.51 mm/yr)prior to the occurrence of the *** accumulated precipitation before the landslide was 279.8 mm,accounting for 54.2%of the total annual precipitation,with a particularly notable surge in monthly precipitation observed during August(250.3 mm).Additionally,the occurrence of a seismic event with a magnitude of Ms 6.9 in Menyuan County,80 km away from Xining,could be a potential triggering factor to the landslide,as evidenced by an abrupt subsidence alteration observed prior to and following the *** maximum subsidence in the line of sight(LOS)direction exceeded 11 mm,exhibiting a highly consistent spatial distribution with the occurrence range of *** results suggest that the Jiujiawan landslide was likely induced by earthquake events in the early stage and heavy rainfall in the later *** FLAC3D numerical

关键词： Landslide Development characteristic Driver Mudstone Xining Basin

Orbital pacing and secular evolution of lake-level changes reconstructed by sedimentary noise modeling during the Early Jurassic icehouses-(super)greenhouses

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Science China Earth Sciences 2024年第1期67卷 252-267页

作者： Meng LI Xin LI Stephen P.HESSELBO Mingjie LI Wenjin LIU Wei WU Jienan PAN Ruizhen GAO School of Resources and Environment Henan Polytechnic UniversityJiaozuo 454000China Camborne School of Mines and Environment and Sustainability institute University of ExeterPenryn TR109FEUnited Kingdom qinghai No.105 Coal geological exploration Team Xining 810000China

Lake-level changes can significantly affect paleoenvironmental evolution,resource occurrence,terrestrial carbon budget,and biodiversity in continental *** is one of the most critical factors controlling lake-level *** of the Early Jurassic has been evidenced by oscillating icehouses to(super)greenhouses with interrupted intermittent extreme climatic events(hyperthermal and cooling),e.g.,the Toarcian oceanic anoxic event(~183 Ma)and the late Pliensbachian cooling event(~185 Ma).Lake-level evolution and hydrologic cycling on Earth’s surface during the Early Jurassic icehouses-to-(super)greenhouses are thus far poorly understood due to a lack of continuous high-resolution nonmarine *** we present a super-long nonmarine lake level record for this pivotal interval from the early Pliensbachian to Toarcian by sedimentary noise modeling,and construct a 16.7-Myr-long astronomical time scale(174.2 Ma to 190.9 Ma)based on cyclostratigraphy analysis of rock color datasets(CIE b*)of the qaidam *** results document lake-level oscillations on a 5-to 10-million-year(Myr)scale which shows a pronounced correlation with long-term climate variation and extreme climatic events,and 1-to 2.5-Myr-scale lake-level changes that are prominently paced by the 2.4-Myr long-eccentricity forcing and the 1.2-Myr obliquity *** the Pliensbachian Stage,the 1.2-Myr-scale lake-level changes are in phase with the coeval sealevel *** forced growth and decay of the ephemeral or permanent ice sheets in polar regions are interpreted to control the synchronous ups-and-downs of continental lake level and global sea ***,during the Toarcian ice-free greenhouses to(super)greenhouses,the 1.2-Myr-scale lake-level variations show an anti-phase relationship with global sea level,indicating a‘seesaw’interaction between continental reservoirs(lakes and groundwater)and global *** 2.4-Myr longeccentricity cycles mainly regulate variation

关键词： Milankovitch cycles Orbital forcing Sedimentary noise model Lake level Continental basins

Flow variation and circulation process of saline springs in the Nangqen Basin， Tibetan Plateau

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Journal of Earth Science 2024年

作者： Jibin Han Jianping Wang Hongkui Ma Yongshou Li Zhao An Yong Xiao Wenhua Han Huaide Cheng Haizhou Ma Hongchen Jiang Key Laboratory of Green and High-end Utilization of Salt Lake Resources， qinghai institute of Salt Lakes， Chinese Academy of Sciences qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes， qinghai institute of Salt Lakes， Chinese Academy of Sciences qinghai geological Survey Faculty of Geosciences and Engineering， Southwest Jiaotong University State Key Laboratory of Biogeology and Environmental Geology， China University of Geosciences

There was limited knowledge about the flow fluctuations and cycling processes of saline springs in the Nangqen Basin in the Sanjiang tectonic zone. In this work， the flow variation of the saline springs during the wet and dry seasons were monitored using volumetric and cross-sectional methods， and the cycling process of the saline springs was quantitatively identified using the integrated hydrochemical and isotopic methods. The results show that most saline springs in the Nangqen Basin had significantly different flow rates， ion concentrations， and TDS concentrations. The ions mainly come from carbonate and sulfate minerals. There is no internal hydraulic connection between these saline springs， and the impact of seasonal changes on the flow is relatively small， indicating that the saline springs originate mainly from deep circulation. The recharge elevation of the saline springs ranges 3661–4990 m， with an average of 4100 m. The circulation depth of the saline springs ranges 240–570 m， with an average of 431 m. The recycle time ranges 1.15–30.86 years， with an average of 15.66 years. These results could provide a scientific basis for the development and utilization of saline spring resources in the Nangqen Basin.

关键词：

Genesis of Neogene Formation Waters in the Central qaidam Basin:Clues from Hydrochemistry and Stable D-O-S-Sr Isotopes

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1801-1813页

作者： HAN Guang PAN Tong LI Qingkuan FAN Qishun HU Yan LIU Jiubo ZHANG Xiying Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China qinghai Provincial Key Laboratory of exploration Research of Salt Lake Resources in qaidam Basin Qinghai Qaidam Integrated Institute of Geology and Mineral Resource ExplorationGolmudQinghai 816099China University of Chinese Academy of Sciences Beijing 100049China Bureau of geological exploration&Development of qinghai province Xining 810008China

geological explorations have revealed plentiful Neogene formation waters in anticlines in the central qaidam Basin(QB).However,the hydrochemistry and origin of these waters are *** this study,the hydrochemistry and DO-S-Sr isotopes of these formation waters were determined to study their origin and *** formation waters are enriched in Na-Ca-Cl,and depleted in Mg-K-SO4-HCO3ions with elevated Li-B-Br-Sr *** D-O isotopes prove that the formation waters originated from weak-evaporated meteoric waters,and experienced water-rock *** comparisons and Caexcess-Nadeficitdiagrams suggest that solute sources of these waters include evaporite dissolution,waterrock interaction,and minor residual lake *** sulfate reduction and water-rock interactions are supported by the high S-Sr *** enriched Li-B-Br-Sr concentrations of these waters are in accord with the high geochemical background values of the *** the genesis of the formation waters,it can be concluded that meteoric waters from the southern Kunlun Mountains were discharged into the basin,weakly evaporated,and then infiltrated into the Neogene strata through faults leaching the soluble ions and mixing with residual lake brines,and all experienced water-rock interactions and a sulphate reduction process.

关键词： hydrochemistry brine resources lake/meteoric waters D-O-S-Sr isotopes Miocene-Pliocene qaidam Basin

Connections between Evaporite Deposition and Glacial Periods since the Middle Pleistocene in Salt Lakes in the Western qaidam Basin, China

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1704-1715页

作者： GU Jiani CHEN Andong LIU Jiajun HAN Guang WANG Xuefeng School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China MNR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China qinghai Provincial Key Laboratory of exploration and Research on Salt Lake Resources in the qaidam Basin Qaidam Integrated Geological Exploration Institute of Qinghai ProvinceGolmudQinghai 816000China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The Quaternary was the main evaporite deposition period in the qaidam Basin(QB), but the correlation between the evaporite deposition period and the glacial period is still unclear. In this study, the research objects are primarily evaporite-bearing strata in a 461.58 m-long drill core in the QB. X-ray powder diffraction(XRD) and scanning electron microscopy(SEM) were applied to study the evaporite minerals, U-Th dating being applied to construct the ~(230)Th geochronological framework. Evaporite deposition from Marine Isotope Stage(MIS) 15 to MIS 4 in the borehole was reconstructed via mineralogical and geochronological data. The evaporite minerals are mainly halite(NaCl), mirabilite(Na_(2)SO_(4)·10H_(2)O), thenardite(Na_(2)SO_(4)) and gypsum(CaSO_(4)·2H_(2)O). A total of 9 effective ~(230)Th data points, ranging from 492.5 ± 43.0 ka to 62.0 ± 11.9 ka, were obtained. The depositional age of the earliest halite layer in the borehole is 592.5–563.0 ka. There were mirabilite deposits in the QB during the cold glacial environment of MIS 6. During MIS 4, the study area desiccated, with mirabilite and halite being deposited. This study suggests that mirabilite is an indicator mineral for the glacial environment in the QB, while halite deposition does not correspond well to glaciation.

关键词： evaporite deposition mirabilite Quaternary glaciation Quaternary salt lake qaidam Basin

Source Analysis of Lithium Deposit in Dong-Xi-Taijinaier Salt Lake of qaidam Basin,qinghai-Tibet Plateau

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Journal of Earth Science 2023年第4期34卷 1083-1094页

作者： Jibin Han Hongchen Jiang Jiubo Liu Jianxin Xu Wenhua Han Haiyun Zhang Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Geology and Environment of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China qinghai Provincial Key Laboratory of exploration Research of Salt Lake Resources in qaidam Basin Qaidam Comprehensive Geological and Mineral Exploration Institute of Qinghai ProvinceGolmud 816099China

The Dong-Xi-Taijinaier Salt Lake(DXTSL) of qaidam Basin is known as one of rich lithium reserves in ***,the source of lithium deposits in this region remains *** hydrochemistry and lithium isotopes(δ7Li) of water and solid samples along the Nalenggele River catchment were studied in combination with rock leaching *** results showed the hot springs in the upstream contained high content of lithium and ratio of Li × 1 000/total dissolved solids(1.5–3.5),but the lower δ7Li values(4.33‰–11.59‰),meaning that it is one important lithium *** leaching experiments by the rich-lithium volcanic rocks(average content of 474.7 mg/kg) showed that under temperature of 20–80 ℃ and long time duration(24–96 h),the concentration of lithium released by leaching of the sampled volcanic rocks increased from 0.58 to 1.49 mg/L,with the leaching rate decreasing from 0.024 to 0.015 mg/(L·h) and the corresponding lithium release rate increasing from 29% to 74%.Calculation based on water-salt balance showed that the total amount of lithium contribution from hydrothermal fluids and volcanic rock weathering is about 4.99 and 0.29 Mt since 13.1 ka,***,hot springs and leaching of volcanic rocks are main contributors to lithium deposit in DXTSL.

关键词： hydrothermal supplement volcanic rock lithium source 'Li isotope Dong-Xi-Taijinaier SaltLake.

Logging Response Characteristics for Pore Brine Potassium Reservoir in the West of qaidam Basin

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 220-221页

作者： LI Hongpu ZHENG Mianping LIU Ying institute of Mineral Resources Chinese Academy of Geological Sciences institute of Geology and Mineral Resources of qaidam Comprehensive exploration in qinghai province

Pore brine potassium and deep sand gravel layer found is of large size and high economic value liquid potash deposit in western qaidam basin depression tectonic(Fig.1).Because the reservoir is relatively thick,it is d... 详细信息

关键词： log response western qaidam basi n depressi on tectonics bri ne pore reservoir liquid potas h

Age of Yingfeng rapakivi granite pluton on the north flank of qaidam and its geological significance

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Science China Earth Sciences 2004年第4期47卷 357-365页

作者： XIAO Qinghui1,2, LU Xinxiang1,3, WANG Fei4, SUN Yangui5, WEI Xiangdong3 & XING Zuoyun6 1. Division of Granite Geology, China geological Survey, Yichang 443003, China 2. Information Center of Ministry of Land and Resources, Beijing 100812, China 3. geological Survey of Henan province and institute of geological Research of Henan province, Zhengzhou 450053, China 4. geological institute, China Seismological Bureau, Beijing 100029, China 5. geological Survey institute of qinghai province, Xining 810032, China 6. China University of Geosciences, Wuhan 430074, China Division of Granite Geology China Geological Survey Yichang China Information Center of Ministry of Land and Resources Beijing China geological Survey of Henan province and institute of geological Research of Henan province Zhengzhou China geological institute China Seismological Bureau Beijing China geological Survey institute of qinghai province Xining China China University of Geosciences Wuhan China

The Yingfeng rapakivi granite on the north flank of qaidam is a newly discovered Proterozoic rapakivi pluton in China, which was found after the discovery of Shachang rapakivi in Miyun County, Beijing and Kuandian rapakivi in Jilin province. Yingfeng rapakivi pluton is ex-posed on the north side of the suture belt between Qinling-Kunlun orogenic belt and North China plate. U-Pb zircon isotopic dating and Ar-Ar isotopic dating of both hornblende and K-feldspar from the Yingfeng rapakivi granite have been conducted. The results show that the age of (1776±33)Ma at the upper intercept in Concorde diagram represents the age of formation of the plu-ton, whereas the age of (526 281) Ma at the lower intercept and Ar-Ar mineral dating of horn-blende and K-feldspar correspond to the age of a later event affecting the pluton, suggesting that Yingfeng pluton has ever been affected by strong regional Caledonian-Hercynian tectonic movement after its formation. The discovery of middle Proterozoic Yingfeng rapakivi granite pro-vides a petrologic evidence for the timing of cratonization of both the continental crust basement in western China and the basement of the North China plate and for a rifting event taking place in the mid-Proterozoic, suggesting that an amalgamation of ancient China continents had ever happened during the L liang Movement?between the early Proterozoic and the mid-Proterozoic.

关键词： rapakivi, U-Pb dating, Ar-Ar dating, Kunlun-Qinling orogenic belt.

Geochemistry and Zircon U-Pb Geochronology of Early Paleozoic S-type Granites in the Eastern Qilian Block,Northwest China

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 439-458页

作者： LIU Xiuting LI Binkai HAN Jilong REN Erfeng GAO Donglin DU Yongsheng REN Qianhui ZHANG Yan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Key Laboratory of Salt Lake Geology and Environment of qinghai province Qinghai Institute ofSalt LakesChinese Academy of SciencesXining 810008China University ofChinese Academy of Sciences Beijing 100049China College of Chemical and Pharmaceutical Engineering(Hebei) University of Science and TechnologyShijiazhuang 050018China Department of geological Engineering Qinghai UniversityXining 810016China Department of Water Conservancy and Electric Power Qinghai UniversityXining 810016China qinghai province Nonferrous Metals Third geological exploration institute Xining 810012China

The Qilian Block(QB)is a Precambrian micro-continent located in the northeastern qinghai–Tibet *** Lower Paleozoic granitic magmatic rocks crop out in the QB.A new integrated study of zircon U-Pb ages and systematic whole-rock geochemical data for the Xindian,Dongjiazhuang and Xiaogaoling granites in the eastern segment of the QB constrains their emplacement ages,petrogenesis,and regional evolutionary history.U-Pb dating reveals that the Xindian granite was emplaced 454 Ma,and both the Dongjiazhuang and Xiaogaoling granites were emplaced ca.440 *** study shows that all granites belong to the high-K calc-alkaline to shoshonitic series and are S-type granites formed by partial melting of continental crust,mainly *** infer that these ca.454–445 Ma granites formed in a syn-collisional setting during the continental collisional between the qaidam and Qilian blocks.

关键词： geochemistry geochronology petrogenesis syn-collision Qilian Block NW China