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Geochemical characteristics of Jurassic coal and significance for the evolution of the environment, Yanqi Basin, China

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Progress in Natural Science:Materials International 2006年第9期16卷 974-982页

作者： WU Chaodong , XU Youling, GUO Zhaojie1, QUAN Shujin, LI Yonglin and FENG Xue ( Key Laboratory of Orogenic Belts and Crustal Evolution of Department of Education, Peking University, Beijing 100871, China 3rd geological Survey brigade, Henan Bureau of Mineralogical and Resources, Xinyang 476000, China Exploration & Development Research Institute of Henan Oilfield, SINOPEC, Nanyang 473132, China) Key Laboratory of Orogenic Belts and Crustal Evolution of Department of Education Peking University Beijing 100871 China 3rd geological Survey brigade Henan Bureau of Mineralogical and Resources Xinyang 476000 China Exploration and Development Research Institute of Henan Oilfield SINOPEC Nanyang 473132 China

The Mesozoic strata of the Yanqi Basin consists of coarse debris with coal beds, characterized by the developments of coal seams of the Jurassic sediments whose main petrologic contents are glutenite, fine sandstone, mudstone, carbonaceous shale and coal. Based on the analyses of the minerals, trace elements and REEs, we try to find geochemical characteristics of the coal seam formation process. The analysis results indicate that the contents of ash and sulfur are low while the content of phosphor is comparatively high, and that the specific value of Al2O3/SiO2 is relatively high and that of (Al2O3 + SiO2)/(Fe2O3 + CaO+ MgO) is near 1. All these results indicate that the coal seams are formed in the relatively deep marsh, which is favorable for the evolvement of hydrocarbon at the diagenesis stage.

关键词： coal sedimentary geochemistry trace elements Jurassic.

Fracture Characteristics and Heat Accumulation of Jixianian Carbonate Reservoirs in the Rongcheng geothermal Field, Xiong'an New Area

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1902-1914页

作者： WANG Yingjin MA Feng XIE Heping WANG Guiling WANG Zhihe Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center for geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China

geothermal energy plays an important role in urban construction of the Xiong’an New Area. geothermal reservoir fracture distribution of the Mesoproterozoic Jixianian Wumishan Formation(Fm.) carbonate reservoir in the Rongcheng geothermal field are evaluated based on FMI log from Wells D19 and D21. The results show carbonate reservoir fracture density of Well D19 is 15.2/100 m, greater than that of Well D21 with a value of 9.2/100 m. Reservoir porosity and permeability of Well D19 are better than that of Well D21, and the water saturation is bimodally distributed. The movable fluid volume ratio(BVM) of Well D19 is 2% to 8% with some zones exceeding 20%, while the value of Well D21 is less than 4%. Therefore, reservoir fractures in Well D19 are more conducive to fluid flow. Reservoir fractures have a similar occurrence to normal faults, indicating that the tensile stress field controlled the formation of such fractures. Developed reservoir fractures provide a good channel for groundwater convection. The circulation of regional groundwater and the heat exchange between water and rock and the multiple heat accumulation patterns form a stable and high potential heat reservoir in the Rongcheng geothermal field.

关键词： geothermal resource carbonate reservoir fracture FMI log in-situ stress

Provenance of the Early Permian bauxitic claystone in Huayingshan region,Sichuan Basin,South China:Constraints from U-Pb ages and trace elements of detrital zircons

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Journal of Palaeogeography 2023年第2期12卷 211-228页

作者： Tian-Jia Liu Xun-Lian Wang Zhen-Tao Wang Xi-Fang Liu Peng-Cheng Ju Jia-Ai Zhong School of the Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Metallogeny and Mineral Resources Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069Shaanxi ProvinceChina 405 geological brigade of Sichuan Bureau of Geology and Mineral Resources Dujiangyan 611830Sichuan ProvinceChina

The Early Permian bauxite in the Sichuan Basin is an important part of karst-type bauxite deposits in South China Block and its provenance is poorly *** we present results of mineralogy,wholerock geochemistry,detrital zircon U-Pb ages and trace element compositions of the bauxitic claystone from the Lower Permian Dazhuyuan Formation and those of the siltstone from the underlying Lower Silurian Hanjiadian Formation in Huayingshan region,Sichuan Basin,South China Block to constrain the provenance of the bauxitic *** zircons from bauxitic claystone and siltstone have similar age spectra,and the ages of bauxitic claystone are classified into five groups of 2600-2200 Ma,1800-1600 Ma,1200-900 Ma,900-650 Ma,and 650-400 Ma *** of the siltstone are classified into four groups of 2600-2200 Ma,1200-900 Ma,900-650 Ma,and 650-400 Ma *** propose that the bauxitic claystone in the study region has mixed sources:the siltstone of the Lower Silurian Hanjiadian Formation probably constitutes the dominant source,and the Late Paleoproterozoic magmatic rocks along the western margin of the Yangtze Block are probably the secondary ***,the source materials of the Hanjiadian Formation siltstone are mainly sourced from Grenville-aged magmatic rocks in the Cathaysia Block and Neoproterozoic magmatic rocks in the Jiangnan orogen,with minor contributions from the underlying clastic sediments in the Cathaysia Block and Pan-African magmatic rocks in the orogen in eastern Gondwana.

关键词： Huayingshan Dazhuyuan Formation Bauxitic claystone Detrital zircon Mixed sources

Provenance of Late Mesozoic Strata and Tectonic Implications for the Southwestern Ordos Basin,North China:Evidence from Detrital Zircon U-Pb Geochronology and Hf Isotopes

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Journal of Earth Science 2022年第2期33卷 373-394页

作者： Zuoqiang Li Fengjie Li Zheng'an Chen Xuelian Lai Xiaokang Ma State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China 207 geological brigade of Sichuan Bureau of Exploration&Development of Geology&Mineral Resources Leshan 614000China

In order to determine the provenance and variation characteristics of sandstone-type uranium deposits located in the southwest Ordos Basin,U-Pb geochronology and Hf isotope analyses were conducted on detrital zircons from the Late Mesozoic strata of the SD01 well in the Zhenyuan *** detrital zircon U-Pb ages of four samples exhibited four main peaks at 250–330,420–500,1720–2000,and 2340–2580 Ma,with a small number of zircons dated at 770–1100 *** detrital zircon age spectrum and further restriction provided by the in-situ Hf isotopic data suggest that the provenance of each stratum was mainly derived from the crystalline basement rock series(Khondalites,intermediate-acidic intrusive rocks,and metamorphic rocks)of the Alxa Block to the northwest and the Yinshan Block to the north,with minor amounts of Caledonian magmatic rocks and Jingning Period rocks from the western part of the northern Qilian orogenic belt to the west and the northern Qinling orogenic belt to the *** provenance of the sandbody has not changed significantly and is of the Middle Jurassic–Early *** clear variations in the zircon ages of the samples from the Zhiluo and Anding formations were likely influenced by climate change during the Middle–Late *** Triassic zircon age(<250 Ma)first appeared in Early Cretaceous strata,suggesting that tectonic activity was relatively strong in the northern Qinling orogenic belt during the Late Jurassic and produced extensive outcrops of Indo-Chinese granite,which were a source of basin sediments.

关键词： Southwestern Ordos Basin provenance analysis Late Mesozoic detrital zircon U-Pb geochronology Hf isotopes geochemistry

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Distribution characteristic and geological signiflcance of rare earth elements in Lopingian mudstone of Permian,Panxian county,Guizhou province

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Mining Science and Technology 2011年第4期21卷 469-476页

作者： Shao Yubao Guo Yinghai Qin Yong Shen Yulin Tian Li School of Resource and Geoscience China University of Mining ＆ Technology Xuzhou 221008 China Key Laboratory of CBM Resource and Reservoir Generating Process China Ministry of Education Xuzhou 221008 China 159 geological brigade Guizhou Bureau of Coal Geology Liupanshui 553500 China

In order to discuss the geochemical characteristic of REEs （rare earth elements） and their geological application, we measured the contents of rare earth elements, trace elements and minerals of 29 Lopingian （Late Permian） mudstone samples in Panxian county, carrying out ICP-MS and XRD analysis. The results show that the amount of REEs （185.56-729.46 ×10-6） is high. The ratios of w（LREE）/w（HREE）（6.84- 13.86） and W（La）N/w（Yb）N （1.01-3.02） show clear differentiation of LREEs and HREEs. ZREE has a significantly or critically positive correlation with lithophile elements Th, Nb, Ta, Ti, Ca, Sc, Cs, Zr, Hf, Sr, Be and chaicophile element Zn, a critically negative correlation with siderophile element Fe and a slightly positive correlation with illite, illite smectite mixed layers and siderite. REEs originate mainly from terrigenous minerals, in an inorganic phase, Source rocks of our samples consist of Emeishan basalt and a small part of sedimentary rocks, as suggested by the distribution patterns of REEs and w（∑REE）- w（La）/w（Yb） diagram. Moreover, abnormal surfaces near the sequence boundaries （SB2, SB3, SB4） are related wiLth the boundaries, identified by geochemical characteristics of the REEs, such as ∑REE. w（LREE）/w（HREE）, Eu/Eu＊ and Ceanom.

关键词： Rare earth element Provenance Sequence boundary Lopingian Panxian county

HEAT FLOW MEASUREMENTS IN PANZHIHUA-XICHANG(PANXI) PALEORIFT ZONE, SW CHINA

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Chinese Science Bulletin 1987年第8期32卷 550-554页

作者：汪集暘汪缉安黄少鹏张文仁周友松金昕 Institute of Geology Academia Sinica Beijing Geophysical brigade Panxi Geological Team of Sichuan Geological Bureau Xichang Geophysical brigade Panxi Geological Team of Sichuan Geological Bureau Xichangeat flow measurements are of great significance in rift studies. The Panxi area has. been considered to be a paleorift zone of the Hercynian-Indosinian period. For a long time the geological and geophysical community are greatly concerned about the thermal state and the possibility of the existence of high heat flow in this region. And great efforts and research work have been made by joint geothermal study program of Geother

Heat flow measurements are of great significance in rift studies. The Panxi area has. been considered to be a paleorift zone of the Hercynian-Indosinian period. For a long time, the geological and geophysical community are greatly concerned about the thermal state and the possibility of the existence of high heat flow in this region. And great efforts and research work have been made by joint geothermal study program of

关键词： concerned geophysical possibility strata PALEORIFT ZONE PANXI SW CHINA mudstone Paleozoic rock

Types of uranium deposits in central Zhuguang Mountains in Hunan Province,South China and their metallogenic regularity and prospecting directions

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China Geology 2020年第3期3卷 411-424页

作者： Zhen-hua Xiao Shen-bang Xiong Chun-hua Li Ying Liu Zhong-ding Yang Xiao-xi Feng Xue-wen Liu No.302 brigade of Hunan Nuclear Geology Chenzhou 432000China East China University of Technology Nanchang 330013China Tianjin Center China Geological SurveyMinistry of Natural ResourcesTianjin 300170China

The central Zhuguang Mountains in Hunan Province is located at the junction of the three provinces,namely Hunan,Jiangxi,and Guangdong,where the famous Lujing uranium ore field *** uranium deposits occurring in this area are all granite-related and they can be divided into three types,namely endogranitic ones,perigranitic ones,and contact zone *** endogranitic uranium deposits are mainly controlled by the structural alteration zones developing within granites,with fragmentation,hematitization,and alkali metasomatism as their main mineralization *** perigranitic uranium deposits are mainly produced in the carbonaceous,siliceous,and argillaceous composite layers of epimetamorphic rocks and are controlled by fractured zones formed due to interlayer *** contact zone type uranium deposits mainly occur in the contact parts between the granites and favorable *** have developed in favorable sections where multiple sets of structures are combined and *** main metallogenic regularities of uranium in the central Zhuguang Mountains are as *** basic conditions for the uranium mineralization in this area include the framework consisting of regional deep large faults and their associated multi-set multi-direction favorable metallogenic structures,multi-cycle and multi-stage uranium-rich rock masses,and uranium-rich folded ***,the uranium deposits in this area are closely related to granites in terms of genesis and space and they are formed in different structural parts subject to the same ***,based on the summary of the characteristics and regularities of uranium mineralization in this area,the controlling factors of different types of uranium deposits in the area were explored and six metallogenic target areas were *** these will provide references for the exploration of uranium deposits in this area.

关键词： Uranium deposits Magmatic hydrothermal type Metallogenic regularity Mineral exploration engineering Prospecting direction Zhuguang Mountain Hunan Province South China

Origin and chronology for hornblende gabbroic intrusions in Urad Zhongqi of western Inner Mongolia and their tectonic implications

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Global Geology 2015年第2期18卷 88-97页

作者： WANG Yingde SUN Fengyue WANG Li ZHANG Gengxin LIU Jinlong Huo Liang College of Earth Sciences Jilin University geological brigade No.208 of China National Nuclear Corporation

The Urad Zhongqi mafic intrusions crop out in western Inner Mongolia and are dominated by hornblende *** LA-ICP-MS U-Pb dating indicates that the mafic pluton was emplaced in the Early Permian(272 ± 3Ma).The hornblende gabbro rocks have low concentrations of Si O2,high total Fe2O3,Mg O,Ni,Co,Sc and *** rocks are characterized by selective enrichment of large ion lithophile elements(LILE) and light rare earth elements(LREE),and depletion in high field strength elements(HFSE)(***,Ta,Zr,Hf,P and Ti).It suggests that they formed from a primary magma generated by the partial melting of lithospheric mantle material had been previously modified by subduction-related *** to the geochemical data and the geology of the region,the authors found that the Early Permian hornblende gabbroic in western Inner Mongolia formed in a post-collisional extensional setting.

关键词： Hornblende gabbro western Inner Mongolia Paleo-Asian Ocean post-collisional extensional setting

STRUCTURES OF CRUST AND UPPER MANTLE AND THEIR RELATION TO CENOZOIC TECTONISM IN NORTHERN PART OF NORTH CHINA

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Science China Chemistry 1983年第5期26卷 550-560页

作者：刘国栋刘昌铨 Beijing Zhengzhou State Seismological Bureau Geophysical Prospecting brigade Institute of Geology

On the basis of deep seismic profiling carried out in the past six years, the velocity, gcoelectrical and geothermal structures of the crust and upper mantle and tectonic frames of the Moho discontinuity and asthenosphere have been determined for the northern part of North China. A close relationship exists between Cenozoic teetonism and the geodynamic processes in the crust and upper mantle. We surmise that the intense inhomogeneous activities of the asthenospherc between the late Cretaceous and the Cenozoic may have given rise to the following processes: lithospheric breakup, basalt eruptions, increase in geothermal gradient, lower crustal creep, upper crustal spreading, subsidence and the accumulation of sedimentary deposits as well as the development of shallow-level normal faults. The dip angles of such faults gradually decrease with depth and thus disappear in the low velocity layer of the crust.

关键词： STRUCTURES OF CRUST AND UPPER MANTLE AND THEIR RELATION TO CENOZOIC TECTONISM IN NORTHERN PART OF NORTH CHINA than NNE