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Combination Patterns and Depositional Characteristics of Ordovician Carbonate Banks in the Western Tarim Basin,China

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Acta Geologica Sinica(English Edition) 2012年第4期86卷 894-911页

作者： HU Xiaolan FAN Tailiang GAO Zhiqian YU Bingsong CHEN Xiaozhi WANG Hongyu WANG Jianping LI Rangbin DING Meng LI Yifan school of Energy resources China University of Geosciences key laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationChina University of Geosciences state key laboratory of geological processes and mineral resources China University of Geosciences CNOOC research Institute

The combination patterns and depositional characteristics of the carbonate banks are investigated based on outcrop sections, thin sections, and carbon isotopes of Ordovician in the western Tarim Basin, China. Four carbonate bank combination patterns are deposited in the Ordovician, western Tarim Basin, including： Reef-Bank Complex （RBC）, Algae-Reef-Bank Interbed （ARBI）, Thick-Layer Cake Aggradation Bank （TLCAB）, and Thin-Layer Cake Retrogradation Bank （TLCRB）. All combination patterns show clear periods vertically. The RBC is mainly composed of reefs and bioclastic banks, and the dimension of the RBC depends on the scale of the reefs. Bioclastic banks deposits surround the reefs. The range of the ARBI is determined by the scale of algae-reefs, algae peloid dolomite microfacies and algal dolomite microfacies deposit alternating vertically. TLCAB and TLCRB are deposited as layer-cakes stacking in cycles and extending widely with cross bedding developed. The grains of TLCAB and TLCRB are diverse and multi-source. With the impacting of relative sea level change, biological development and geomorphology, the ARBI, TLCAB or TLCRB, RBC are successively developed from the Lower Ordovician Penglaiba Formation to the Middle Ordovician Yijianfang Formation. The depositional environment analysis of Ordovician indicates that the RBC and ARBI can form effective oil and gas reservoirs, and the TLCAB and TLCRB have the potential to form the huge scale oil and gas reservoirs and to be the crucial targets of exploration for the Ordovician carbonate banks in the future.

关键词： Carbonate bank reef-bank complex algae-reef-bank interbed thick-layer cake aggradation bank thin-layer cake retrogradation bank Ordovician western Tarim Basin

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Source of the Ore-forming Adakitic Porphyry at the Beiya Super-large Au Deposit, Western Yangtze Craton: New Evidence from Zircon U-Pb Ages of the Amphibolite Xenoliths

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 208-209页

作者： LIU Siqi ZHENG Yuanchuan SHEN Yang HOU Zengqian WANG Lu WANG Zixuan state key laboratory of geological processes and mineral resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Objective The Beiya super-large Au-rich porphyry deposit(304 t Au,2.4 g/t Au)is located within the western Yangtze craton,to the southeast of the Sanjiang Tethyan Orogen(Fig.1).The ore-forming porphyry is adakitic,characterized by high Sr/Y and La/Yb ratios coupled with low Y and Yb contents,and is generally thought to be derived from partial melting of thickened mafic lower *** lower crust underneath the western Yangtze craton is mainly composed of ancient crust with Archean ages,juvenile crust resulting from the Neoproterozoic subduction(740–1000 Ma),and late Permian juvenile crust related to the Emeishan mantle *** lower crustal end-member has played a critical role in genesis of the Beiya ore-forming porphyry can be constrained by zircon U-Pb ages of amphibolite xenoliths hosted in the ore-forming porphyry,because these xenoliths represent direct samples of the *** this study,we present new zircon U-Pb ages of these amphibolite xenoliths to have insight into the nature of the Beiya adakitic porphyry source.

关键词： Western Yangtze Craton New Evidence from Zircon U-Pb Ages of the Amphibolite Xenoliths Source of the Ore-forming Adakitic Porphyry at the Beiya Super-large Au Deposit

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Integrated Exploration Model for Concealed Ore Deposit:A Case Study from Shuitou Fluorite Deposit,Inner Mongolia,North China

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Journal of Earth Science 2021年第2期32卷 370-389页

作者： Liang Wang Shouting Zhang Yi Fang Li Tang school of Earth Sciences and resources State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijing 100083China school of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China

The demand for fluorite resource is increasing rapidly as most fluorite deposits on Earth’s surface have been *** newly discovered fluorite deposits in Inner Mongolia are hosted by Permian metamorphosed sandy slate,intermediate-acid intrusive rocks and Cretaceous volcanic sedimentary *** ore bodies are strictly controlled by faults and buried by cover *** feasibility and effectiveness of multi-techniques for prospecting concealed fluorite ore bodies are evaluated,and 10 anomalies are *** the basis of geological features and effectiveness of different methods,the optimum combinations of ore prospecting techniques are proposed for the exploration of zonal type and burial type concealed fluorite ore *** on comprehensive researches,an integrated exploration model is proposed:(i)select key prospecting targets based on geological backgrounds,regional geochemical anomalies of F and Ca,and remote sensing images;(ii)identify the spatial distribution of low resistivity anomaly and ore-controlling structure from geophysical survey;(iii)evaluate the mineralization potential in fault zone based on F and Ca anomalies in key sections selected from low resistivity anomaly zones;and(iv)evaluate the mineralization potential and reveal the spatial distribution of fluorite ore bodies and ore-controlling faults based on integrated geophysical and geochemical *** integrated exploration model is verified to be a powerful tool for prospecting concealed fluorite ore bodies in coverage area.

关键词： prospecting technique concealed fluorite deposit integrated exploration model Shuitou fluorite belt Inner Mongolia North China

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Magma Origin and Evolution of Tengchong Cenozoic Volcanic Rocks from West Yunnan,China:Evidence from Whole Rock Geochemistry and Nd-Sr-Pb Isotopes

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Acta Geologica Sinica(English Edition) 2012年第4期86卷 867-878页

作者： LI Dapeng LUO Zhaohua LIU Jiaqi CHEN Yuelong JIN Ye state key laboratory of geological processes and mineral resources School of Earth Science and ResourcesChina University of Geosciences Institute of Geology and Geophysics Chinese Academy of Sciences school of Ocean Sciences China University of Geosciences

Tengchong Cenozoic volcanics that have record key information on the tectonic evolution and mantle features of the southeast margin of the Tibetan Plateau are of great importance because of its unique eruption history spanning the entire Quaternary period. Magma origin and evolution of Tengchong Cenozoic volcanic rocks were studied on the basis of Nd-Sr-Pb isotope and major and trace element data from different eruptions in the Ma＇anshan area. Different samples within one eruption show relative identical lithologies, chemical and isotopic compositions. However, the geochemical features for the five eruptions are distinct from each other. These volcanic rocks show low Mg# values （〈45）, moderate to high fractionation of LREEs and HREEs, and enrichment of Pb and Ba and depletion of Nb. Tengchong Cenozoic volcanic rocks were derived from an enriched mantle based on Nd-Sr-Pb isotopic studies. And lines of evidence show that crustal contamination should be involved before the eruption of different periods of Tengchong Cenozoic volcanic rocks. Older subducted components may be responsible for adakite recycling at various stages of evolution, which results in the origin of the enriched mantle source magma accounting for the isotopic features of Tengchong Cenozoic volcanic rocks. Segregated primitive magma pulsating injected into magma chamber, fractional crystallized and contaminated with crust component. Finally, magmas with distinct chemical and isotopic compositions for each eruption formed. The extension of the northeast segment of the Yingjiang tectonic belt triggered the pulsating eruption of the Cenozoic volcanics in the Tengchong area.

关键词： Cenozoic volcanism Nd-Sr-Pb isotopes geochemistry Tengchong

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Environmental properties of metallic minerals and their applications in environmental protection in China

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Chinese Journal Of Geochemistry 2005年第3期24卷 221-227页

作者：王吉中李胜荣江永宏魏瑞华牛花朋 state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 ChinaKey Laboratory of Lithospheric Tectonics Ministry of Education China University of Geosciences Beijing 100083 ChinaSchool of the Resources Shijiazhuang University of Economics Shijiazhuang 050031 China state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 ChinaKey Laboratory of Lithospheric Tectonics Ministry of Education China University of Geosciences Beijing 100083 China state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China school of the resources Shijiazhuang University of Economics Shijiazhuang 050031 China

In terms of environmental mineralogy, the environmental properties of metallic minerals, including chemical activation, adsorption, pore effect and nanometer effect, have been analyzed. On the basis of the analysis of environmental properties of metallic minerals, the applications of iron-bearing sulfides, iron and manganese oxides in the purification of wastewaters containing heavy metal ions (Cr{6+}, Hg{2+}, Pb{2+}, etc.) have been summarized. Moreover, research on the application of metallic minerals in environmental protection has been anticipated. It should be a piece of dominating work for environmental mineralogic researchers in the future to lucubrate systematically the physical and chemical characteristics of the metallic mineral surfaces, further reveal the reciprocity process between metallic minerals and water surface, perfect the theory and model of the metallic minerals to remove contaminants, intensify study on the facilities and techniques of metallic minerals to remove contaminants, and entail well the extension and propagation of achievements.

关键词：中国环境保护金属矿物化学活化作用环境管理

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Lithospheric Structure in the North China Craton Constrained from Gravity Field Model(EGM 2008)

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Journal of Earth Science 2011年第2期22卷 260-272页

作者：李媛媛杨宇山 Timothy M Kusky Institute of Geophysics & Geomatics China University of Geosciences state key laboratory of geological processes and mineral resources Three Gorges Research Center for Geo-hazardChina University of Geosciences

A detailed knowledge of the thickness of the lithosphere in the North China craton（NCC） is important for understanding the significant tectonic reactivation of the craton in Mesozoic and *** achieve this goal by applying the newly proposed continuous wavelet transform theory to the Gravity Field Model（EGM 2008） data in the *** structural variations are identified in the scalogram image of profile Alxa-Datong（大同）-Qingdao（青岛）-Yellow Sea（profile ABC）,trans-versing the main units of NCC,which we interpret as mainly representing the Moho and lithosphere-asthenosphere boundary（LAB） *** imaged LAB is as shallow as 60-70 km in the south-east basin and coastal areas and deepens to no more than 140 km in the northwest mountain ranges and continental interior.A rapid change of about 30 km in the LAB depth was detected at around the boundary between the Bohai（渤海） Bay basin（BBB） and the Taihang（太行） Mountains（TM）,roughly coincident with the distinct gravity decrease of more than 100 mGal that marks the North-South Grav-ity Lineament（NSGL） in the *** last we present the gravity modeling work based on the spectral analysis results,incorporating with the observations on high-resolution seismic images and surface *** observed structural differences between the eastern and western NCC are likely associ-ated with different lithospheric tectonics across the *** with seismic tomography results and geochemical and petrological data,this sug-gests that complex modification of the litho-sphere probably accompanied significant litho-spheric thinning during the tectonic reactivation of the old craton.

关键词： EGM 2008 geopotential model,continuous wavelet transform Bouguer gravityanomaly constrained gravity field modeling,North China craton (NCC).

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Fluid Evolution and Scheelite Precipitation Mechanism of the Large-Scale Shangfang Quartz-Vein-Type Tungsten Deposit, South China: Constraints from Rare Earth Element(REE) Behaviour during Fluid/Rock Interaction

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Journal of Earth Science 2020年第4期31卷 635-652页

作者： Runsheng Chen Luyun Zhu Shao-Yong Jiang Ying Ma Qinghai Hu state key laboratory of geological processes and mineral resources School of Earth ResourcesChina University of GeosciencesWuhan 430074China Fujian Institute of geological Survey and research Fuzhou 350013China key laboratory of Geochemical Exploration Institute of Geophysical and Geochemical ExplorationCA GSLangfang 065000China

Unlike classic skarn-type scheelite deposits directly acquiring sufficient Ca2+ from surrounding limestones, all of the scheelite orebodies of the Shangfang tungsten(W) deposit occur mainly in amphibolite, and this provides a new perspective on the mineralization mechanism of W deposits. The ability of hydrothermal scheelite(CaWO4) to bind REE3+ in their Ca2+ crystal lattices makes it a useful mineral for tracing fluid-rock interactions in hydrothermal mineralization systems. In this study, the REE compositions of scheelite and some silicate minerals were measured systematically in-situ by laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS) to assess the extent of fluid-rock interactions for the Late Mesozoic quartz-vein-type Shangfang W deposits. According to the variations in CaO and REE among scheelite and silicate minerals, the amphibole and actinolite in amphibolite may be able to release large amounts of Ca2+ and REE3+ into the ore-forming fluids during chlorite alteration, which is critical for scheelite precipitation. Furthermore, an improved batch crystallization model was adopted for simulating the process of scheelite precipitation and fluid evolution. The results of both the in-situ measurements and model calculations demonstrate that the precipitation of early-stage scheelite with medium rare-earth elements(MREE)-rich and [Eu/Eu*]N1. Even though the partition coefficient of REE is constant, the later-stage scheelite will also inherit a certain degree of MREE-depletion and [Eu/Eu*]N future from the residual fluids. As a common mineral, sheelite forms in various types of hydrothermal ore deposits(e.g., tungsten and gold deposits). Hence, the improved batch crystallization model is also possible for obtaining detailed information regarding fluid evolution for other types

关键词： scheelite quartz vein type REE pattern Eu anomaly fluid evolution

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Guadalupian (Middle Permian) Radiolarian and Sponge Spicule Faunas from the Bancheng Formation of the Qinzhou Allochthon,South China

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Journal of Earth Science 2013年第2期24卷 145-156页

作者： Ito Tsuyoshi 张磊冯庆来 Matsuoka Atsushi state key laboratory for geological processes and mineral resources China University of Geosciences Graduate school of Science and Technology Niigata University Department of Geology Faculty of ScienceNiigata University

The Gujingling （古井岭） Section in Xiaodong （小董）, Guangxi （广西） Zhuang Autonomous Region, China, consists of cherts and siliceous siltstones, which belongs to the Bancheng （板城）Formation of the Qinzhou （钦州） allochthon. Three successive radiolarian assemblage-zones related to the Guadalupian （Middle Permian） appear in the section in the following ascending order： Pseudoalbaillella sp. aff. Pseudoaibailleila longicornis-Pseudoalbaillella fusiformis, Follicucuilus monacanthus, and Follicucuilus scholasticus-Foilicucullus porrectus. The radiolarian content in this section is generally greater than that of sponge spicules. The radiolarian fauna commonly consists of abundant Albaillellaria and spherical radiolaria with minor Latentifistularia and Entactinaria. The sponge fauna is composed mainly of hexactinellids with minor demosponges. These siliceous fossil faunal features, comparable with those in a deep basin of the western belt of the Phosphoria Basin in the western United states, indicate that the Bancheng Formation in the Gujingling Section was deposited in a basin deeper than 1 000 m. The siliceous siltstones in the section are characterized by inclusion of silt-sized quartz and no inclusion of sand-sized materials, suggesting that the Gujingling Section was located at least a few hundred kilometers from the South China Block in the Guadalupian.

关键词： radiolarian fossil sponge spicule Guadalupian (Middle Permian) Bancheng Formation Qinzhou allochthon paleobathymerry.

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Coronas around Olivine in the Miaowan Olivine Norite, Yangtze Craton, South China

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Journal of Earth Science 2019年第5期30卷 924-937页

作者： Shuhua Fan Zhaochong Zhang Changqian Ma Qiuhong Xie Lianxun Wang Yanjie Li Yuzhe Zhang state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China College of Desert Control Science and Engineering Inner Mongolia Agricultural University Hohhot 010018 China state key laboratory of geological processes and mineral resources China University of Geosciences Wuhan 430074 China school of Earth Sciences Lanzhou University Lanzhou 730000 China

Coronitic microstructures have been used to interpret the late-stage solidification history of igneous rocks and to constrain the corresponding chemical and/or physical changes. Coronas with three shells were also recognized in the Miaowan olivine norite, Yangtze Craton, South China. In our study, orthopyroxene intergrowth with vermicular magnetite in the inner shell is in optical continuity with magnetite-free orthopyroxene in the middle shell. In the outer shell of brown amphibole remaining magnetite-free orthopyroxene inclusions sporadically occur. Meanwhile Mg# values of orthopyroxene(76–80) in the inner and middle shells are basically consistent with olivine(78–81). In this paper, we propose a multi-stage genetic model for the formation of coronas in the Miaowan olivine norite. In the first stage, the magnetite-free orthopyroxene shell formed through reaction between primocrystal olivine with the residual Si-rich melt at 990–1 053 ℃ and 6.2–6.5 kbar. In the second stage, the orthopyroxene-magnetite symplectite shell formed when primocrystal olivine reacted with the late-stage residual Fe-rich melt promoted by high oxygen fugacity condition at 927–1 035 ℃ and 6.0–6.5 kbar. In the third stage, the brown amphibole shell formed as the presence of residual hydrous melt and replaced the middle shell at 821–900 ℃ and 5.5–6.0 kbar.

关键词： Yangtze Craton Miaowan olivine norite coronas orthopyroxene-magnetite symplectite magmatic origin

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Zircon U-Pb-Hf Isotopic Systematics and Geochemistry of the Granites in the Wurinitu Molybdenum Deposit, Inner Mongolia, China： Implications for Tectonic Setting and Genetic Type of mineralization

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Acta Geologica Sinica(English Edition) 2016年第6期90卷 2066-2079页

作者： ZHANG Zhenjie CHENG Qiuming YAO Lingqing BAI Huishan LI Cheng school of Earth Sciences and resources China University of Geosciences Beijing 100083 China state key laboratory of geological processes and mineral resources (GPMR) China University of Geosciences Wuhan 430074 Hubei China

The Wurinitu Mo deposit is one of the newly found molybdenum deposits in the southwestern part of the late Paleozoic–Mesozoic Erenhot–Dong-Ujimqin metallogenic belt （S-EDMB）, Inner Mongolia, China. In the present study, the mineralization age of the Wurinitu deposit is constrained to 137.3 ± 1.3 to 131.9 ± 1.5 Ma based on a combination of the laser ablation–inductively coupled plasma–mass spectrometry （LA–ICP–MS） zircon U–Pb dating of the mineralization related fine-grained monzonitic granite and the post-mineralization granite porphyry. The results of zircon Lu–Hf isotopes, combined with the geochemical characteristics of the granites in the S-EDMB, suggest that the Wurinitu Mo deposit was formed in an extensional environment in relation to the subduction of the Paleo-Pacific plate in late Mesozoic. The Wurinitu deposit shares similarities with the classical Climax-type porphyry molybdenum deposits in tectonic setting, mineral assemblages, and metal zonation.

关键词： Wurinitu deposit U–Pb dating Lu–Hf isotopes geodynamic backgrounds of mineralization Climax-type

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