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Geochemical characteristics of cold-seep carbonates in Shenhu area,South China Sea

Journal of Oceanology and Limnology 2022年第3期40卷 969-985页

作者： Chongmin CHEN Lifeng ZHONG Zhifeng WAN Chiyu CHENG Wei ZHOU Xing XU School of Marine Sciences Guangdong Provincial Key Laboratory of Marine Resources and Coastal EngineeringSun Yat-sen UniversityZhuhai 519000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China

Cold seeps spread worldwide along the continental margins,which are closely related to the exploration of gas ***-seep carbonates have been reported to record the nature of seepage,including fluid source,sedimentary environment,and variation of seepage *** investigated the morphology,mineralogy,element compositions,and carbon and oxygen isotopes of 15 cold-seep carbonates collected from the Shenhu area,and compared them with 2 carbonates from the Haima cold seep,the South China Sea(SCS),to promote our knowledge of cold-seep system in *** of the Shenhu carbonates exhibit crust morphology,and some are in the form of chimneys and *** absolute(20%–65%)and relative carbonate mineral contents(mainly aragonite and calcite,with minor samples containing dolomite)vary significantly,indicating the multi-stage methane leakage in our study *** samples show a slight negative Ce anomaly,suggesting either the mixing of seawater or variation of the redox condition during the precipitation;the cooccurrence of strongly enriched U and Mo demonstrates anoxic condition during *** mixed genetic methane source was interpreted by δ^(13)C of the Shenhu carbonates to range from-22.34‰to-59.30‰Vienna PeeDee Belemnite(VPDB),and the slight ^(18)O-enrichment imprinted on the carbonates suggests the possible influence from hydrate *** Haima carbonates,with biogenic methane as the main gas source,were presumably formed in a stronger fluid flux by compared with our Shenhu samples.

关键词： cold-seep carbonates geochemistry sedimentary environment fluid source Haima cold seep Shenhu area South China Sea

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Origin of dolomites in the Permian dolomitic reservoirs of Fengcheng Formation in Mahu Sag,Junggar Basin, NW China

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Petroleum Exploration and Development 2023年第1期50卷 43-56页

作者： TANG Yong LYU Zhengxiang HE Wenjun QING Yuanhua LI Xiang SONG Xiuzhang YANG Sen CAO Qinming QIAN Yongxin ZHAO Xinmei PetroChina Xinjiang Oilfield Company Karamay 834000China College of Energy Resources Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Petroleum Exploration and Development Institute PetroChina Xinjiang Oilfield CompanyKaramay 834000China School of History and Geography Chengdu Normal UniversityChengdu 611130China CNOOC Experimental Center CNOOC EnerTech-Drilling&Production Co.Tianjin 300450China Sinopec Southwest Oil&Gas Company Chengdu 610041China

Origin of authigenic dolomites in the dolomitic reservoir of the Permian Fengcheng Formation in the Mahu Sag of Junggar Basin is *** and genetic evolution of the authigenic dolomites in dolomitic rock reservoir of the Fengcheng Formation in the Mahu Sag were analyzed by polarized and fluorescence thin sections,scanning electron microscope(SEM),electron microprobe(EMP),C,O and Sr isotopes analysis,and other techniques.(1)Dolomites were mainly precipitated in three stages:penecontemporaneous-shallow burial stage(early stage of the Middle Permian),middle burial stage(middle stage of the Middle Permian),and middle-deep burial stage,with the former two stages in dominance.(2)Dolomitization fluid was high-salinity brine originating from alkaline *** the penecontemporaneous-shallow burial stage,Mg^(2+)was mainly supplied by alkaline-lake fluid and devitrification of volcanic *** the middle burial stage,Mg^(2+)mainly came from the transformation of clay minerals,devitrification of volcanic glass and dissolution of aluminosilicates such as feldspar.(3)Regular changes of Mg,Mn,Fe,Sr,Si and other elements during the growth of dolomite were mainly related to the alkaline-lake fluid,and to different influences of devitrification and diagenetic alteration of volcanic materials during the burial.(4)In the penecontemporaneous stage,induced by alkaline-lake microorganisms,the micritic-microcrystalline dolomites were formed by primary precipitation,replacement of aragonite and high-Mg calcite,and other processes;in the shallow burial stage,the silt-sized dolomites were formed by continuous growth of micritic-microcrystalline dolomite and replacement of calcites,tuffs and other substances;in the middle burial stage,the dolomites,mainly silt-and fine-sized,were formed by replacement of volcanic *** research results are referential for investigating the formation mechanism and distribution patterns of tight dolomitic reservoirs in the Mahu Sag and other

关键词： dolomitic rock dolomite origin tight oil reservoir Permian Fengcheng Formation Mahu Sag Junggar Basin fluid source fluid evolution isotopic composition

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Hydrothermal alteration associated with Mesozoic granite-hosted gold mineralization at the Sanshandao deposit,Jiaodong Gold Province,China

Hydrothermal alteration associated with Mesozoic granite-hos...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Xiao-Chun Li Hong-Rui Fan M.Santosh Fang-Fang Hu Kui-Feng Yang Ting-Guang Lan Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences China University of Geosciences(Beijing)

The Sanshandao gold deposit(reserves of more than 200 t Au and average grade of 3.96 g/t),located at northwestern edge of the Jiaodong Peninsula,eastern North China Craton,is one of the largest gold deposits in the Jiaodong gold *** this deposit,disseminated-and stockwork-style ores are hosted in Mesozoic granitoids;mineralization and alteration are largely controlled by the regional Sanshandao-Cangshang fault. Host granitic rocks for the deposit display a complex paragenetic sequence of alteration and mineralization. Activities of the Sanshandao-Cangshang fault created structurally controlled permeability allowing for infil- tration of hydrothermal fluids,leading to diffusive K-feldspar alteration on the two fault ***,large scale diffusive sericitization symmetrically developed across the main fault,and partially overprinted the earlier K-feldspar *** the sericitization,relatively small scale silicification occurred,but now it is only retained in the hanging wall of the main ***,the fault gouge formed as a "barrier layer",which is impermeable for later fluids to move *** that,strong pyrite-sericite- quartz alteration occurred only in the footwall of the main fault,and was accompanied by gold precipitation. The last stage carbonation and quartz-carbonate veins marked the waning of gold-related hydrothermal ac- ***-balance calculations indicate complex behaviors of different types of elements during fluid-rock *** major elements were affected by intensive mineral replacement *** expected,the fluid-mobile elements,LILE and LREE,generally show moderate to high *** is notable that even the commonly assumed fluid-immobile elements,such as HREE and HFSE,tend to be changed to various degrees. In addition,Y-Ho,Zr-Hf and Nb-Ta fractionations are observed in altered *** on alteration assemblages and fluid inclusions suggest that the ore-forming fluids were characterized

关键词： Alteration geochemistry Physicochemical condition fluid source Sanshandao deposit Jiaodong gold province

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