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Mechanism for calcite dissolution and its contribution to development of reservoir porosity and permeability in the Kela 2 gas field,Tarim Basin,china

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Science china Earth Sciences 2008年第4期51卷 567-578页

作者： yu bingsong1,3. dong hailliang2,3.& ruan zhuang1,{3., china university of geosciences, beijing 100083. china 2 Department of Geology, Miami university,Oxford, OH 45056, USA 3.Geomicrobiology laboratory, china university of geosciences, beijing, 100083. china state key laboratory of {3. processes and mineral resources China University of Geosciences Beijing China Geomicrobiology laboratory China University of Geosciences Beijing China Department of Geology Miami University Oxford USA

This study is undertaken to understand how calcite precipitation and dissolution contributes to depth-related changes in porosity and permeability of gas-bearing sandstone reservoirs in the Kela 2 gas field of the Tarim Basin, Northwestern china. Sandstone samples and pore water samples are col-lected from well KL201 in the Tarim Basin. Vertical profiles of porosity, permeability, pore water chem-istry, and the relative volume abundance of calcite/dolomite are constructed from 3.00 to 4000 m below the ground surface within major oil and gas reservoir rocks. Porosity and permeability values are in-versely correlated with the calcite abundance, indicating that calcite dissolution and precipitation may be controlling porosity and permeability of the reservoir rocks. Pore water chemistry exhibits a sys-tematic variation from the Na2SO4 type at the shallow depth (3.00-3.3. m), to the NaHCO3.type at the intermediate depth (3.3.―3.95 m),and to the CaCl2 type at the greater depth (3.28―3.3. m). The geochemical factors that control the calcite solubility include pH, temperature, pressure, Ca2+ concen-tration, the total inorganic carbon concentration (ΣCO2), and the type of pore water. Thermodynamic phase equilibrium and mass conservation laws are applied to calculate the calcite saturation state as a function of a few key parameters. The model calculation illustrates that the calcite solubility is strongly dependent on the chemical composition of pore water, mainly the concentration difference between the total dissolved inorganic carbon and dissolved calcium concentration (i.e., [ΣCO2] -[Ca2+]). In the Na2SO4 water at the shallow depth, this index is close to 0, pore water is near the calcite solubility. Calcite does not dissolve or precipitate in significant quantities. In the NaHCO3.water at the intermedi-ate depth, this index is greater than 0, and pore water is supersaturated with respect to calcite. Massive calcite precipitation was observed at this depth interval and

关键词： calcite dissolution porosity thermodynamic Tarim Basin

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Alteration and mineralization styles of the orogenic disseminated Zhenyuan gold deposit, southeastern Tibet: Contrast with carlin gold deposit

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Geoscience Frontiers 2019年第5期10卷 1849-1862页

作者： Huajian Li Qingfei Wang Jun Deng Lin Yang Chaoyi dong Huazhi yu state key laboratory of {3. processes and mineral resources China University of Geosciences (Beijing)

Orogenic disseminated and Carlin gold deposits share much similarity in alteration and *** disseminated orogenic Zhenyuan Au deposit along the Ailaoshan shear zone,southeastern Tibet,was selected to clarify their *** alteration and mineralization from the different lithologies,including meta-quartz sandstone,carbonaceous slate,meta-(ultra)mafic rock,quartz porphyry and lamprophyre were *** to the mineral assemblage and replacement relationship in all types of host rocks,two reactions show general control on gold deposition:(1) replacement of earlier magnetite by pyrite and carbonaceous material;(2) alteration of biotite and phlogopite phenocrysts in quartz porphyry and lamprophyre into dolomite/ankerite and *** the lamprophyre is volumetrically minor and much less fractured than other host rocks,it contains a large portion of Au reserve,indicating that the chemically active lithology has played a more important role in gold precipitation compared to ***-ICP-MS analysis shows that Au mainly occurs as invisible gold in fine-grained pyrite disseminated in the host rocks,with Au content reaching to 258.95 *** diagenetic core of pyrite in meta-quartz sandstone enriched in Co,Ni,Mo,Ag and Hg is wrapped by hydrothermal pyrite enriched in Cu,As,Sb,Au,Tl,Pb and *** host rock lithology has much impact on the alteration and mineralization *** and sericite in altered lamprophyre show they have higher Mg than those developed in other of host rocks denoting that the carbonate and sericite incorporated Mg from phlogopite phenocrysts in the primary lamprophyre during *** ore fluid activated the diagenetic pyrite in meta-quartz sandstone leading the hydrothermal pyrite enriched in Cu,Mo,Ag,Sb,Te,Hg,Tl,Pb and Bi,but the hydrothermal pyrite in meta-(ultra)mafic rock is enriched in Co and Ni as the meta-(ultra)mafic rock host rock contain high content of Co and ***,Au and As s

关键词： Zhenyuan gold deposit Disseminated orogenic gold deposit Host-rock alteration mineralization style Carlin gold deposit

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Metamorphic, deformation, fluids and geological significance of low-temperature retrograde mylonites of Diancangshan metamorphic massif along Ailaoshan-Red River strike-slip fault zone, yunnan, china

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Science china Earth Sciences 2018年第8期61卷 1023-1041页

作者： Xuemei CHENG Shuyun CAO Junyu LI Zunpu yu Yanlong {3. Meixia LV Junlai LIU state key laboratory of {3. processes and mineral resources School of Earth Sciences China University of Geosciences state key laboratory of {3. processes and mineral resources School of Earth Sciences and Resources China University of Geosciences

Diancangshan metamorphic massif is one of the four metamorphic massifs developed along the Ailaoshan-Red River strike-slip fault zone, yunnan, china. It has experienced multi-stage metamorphism and deformation, especially since the late Oligocene it widely suffered high-temperature ductile shear deformation and exhumation of the metamorphic rocks from the deep crust to the shallow surface. Based on the previous research and geological field work, this paper presents a detailed study on deformation and metamorphism, and exhumation of deep metamorphic rocks within the Diancangshan metamorphic massif,especially focusing on the low-temperature overprinted retrogression metamorphism and deformation of mylonitic rocks. With the combinated experimental techniques of optical microscope, electron backscatter diffraction attachmented on field-emission scanning electron microscopy and cathodoluminescence, our contribution reports the microstructure, lattice preferred orientations of the deformed {3.s, and the changes of {3. composition phases of the superposition low-temperature retrograde mylonites. All these results indicate that:(1) Diancangshan deep metamorphic rock has experienced early high-temperature leftlateral shear deformation and late extension with rapid exhumation, the low-temperature retrogression metamorphism and deformation overprinted the high-temperature metamorphism, and the high-temperature microstructure and texture are in part or entirely altered by subsequent low-temperature shearing;(2) the superposition of low-temperature deformation-metamorphism occurs at the ductile-brittle transition; and(3. the fluid is quite active during the syn-tectonic shearing overprinted lowtemperature deformation and metamorphism. The dynamic recrystallization and/or fractures to micro-fractures result in the strongly fine-grained of the main {3.s, and present strain localization in micro-domians, such as micro-shear zones in the mylonites. It is often accompani

关键词： Low-temperature mylonites Brittle-ductile transition Microstructure Fluid Exhumation Rheological weakening

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Manganese carbonate stromatolites of the Ediacaran Doushantuo Formation in Chengkou,northern Yangtze Craton,china

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Journal of Palaeogeography 2021年第3期10卷 356-381页

作者： Yi Zhang Jian Li Long Chen Yi Wei Qiang Shi dong-Ge Wang Qing-Ming Wu Liao-yuan Song Meng Tian Hong-Wei Kuang Yong-Qing Liu Kaarel Mänd Hua-Qing Bai Zi-Liang Liu yu-Chong Wang Da-Wei Qiao Wen-Jun Zhu No.205 geological Team Chongqing Bureau of Geology and Minerals ExplorationChongqing 402160China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E8Canada Department of Geology University of TartuTartu 50411Estonia state key laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059Sichuan ProvinceChina Petrochina Xinjiang Oilfield Company Karamay 834099Xinjiang Uygur Autonomous RegionChina

The origin process of manganese ores remains unsolved *** the origins of stromatolites that contain manganese may be a key to deciphering the sedimentary environments and metallogenic processes of these ***,only a few manganese stromatolites have been discovered and described until *** are well developed in the manganese deposits,located near the top of the Ediacaran Doushantuo Formation in Chengkou area of Chongqing,northern Yangtze Craton,but has not been explicitly studied;and whether they are true stromatolites or Epiphyton microbialites remains *** on field and core observations and thin section microscopy,the characteristics of five types of manganese stromatolites and their growth modes are described in detail in this *** results show that these stromatolites grew in a biostrome in shoal and lagoon environments and were syngenetic with oncolites and oolites on a carbonate ramp behind the *** stromatolites can be categorized into three forms:(1)stratiform;(2)columnar,which includes branched and columnar types;and(3.stratiform-columnar,which is a transitional *** on a criterion that the diameter is less than or greater than 1 mm,columnar stromatolites are further divided into micro-columnar(1 mm)columns,which display synchronous growth and are similar to *** shapes are mainly controlled by water depths and hydrodynamic *** greater the water depth,the more columnar the columns tend to *** strong hydrodynamic conditions decrease the growth rate of stromatolites,and they even stopped growth due to wave ***,pillared laminar textures(not Epiphyton),which consist of dendritic,micro-branched and microcolumnar stromatolites,are a common feature of the larger stratiform,stratiform-columnar and columnar *** alternations of laminae with different internal textures record subtle fluctuations in wat

关键词： Microbialites Manganese stromatolites Ediacaran Doushantuo Formation Yangtze Craton Growth mode

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北衙金矿多期热液成矿作用识别:来自地质、岩相学、流体包裹体和H-O-S同位素证据

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岩石学报 2018年第5期34卷 1299-1311页

作者：王璇杨林邓军李华健于华之董超一中国地质大学地质过程与矿产资源国家重点实验室北京100083

北衙超大型金矿床是三江特提斯成矿域中喜山期斑岩-矽卡岩型矿床的典型代表,长期以来大量研究均围绕斑岩-矽卡岩成矿作用开展并取得了丰硕成果,然而对于北衙金矿是否存在多期热液成矿作用尚不明确。本次研究基于详细野外调查、岩相学与... 详细信息

北衙超大型金矿床是三江特提斯成矿域中喜山期斑岩-矽卡岩型矿床的典型代表,长期以来大量研究均围绕斑岩-矽卡岩成矿作用开展并取得了丰硕成果,然而对于北衙金矿是否存在多期热液成矿作用尚不明确。本次研究基于详细野外调查、岩相学与矿相学研究,流体包裹体显微测温及成分分析、H-O-S同位素分析等多种手段,识别了北衙金矿成矿晚期存在新一期热液成矿事件。主要证据如下:(1)野外调查发现北衙金矿发育NW向陡倾断裂控制的石英多金属硫化物脉,其切割矽卡岩矿体与矽卡岩晚期石英硫化物矿脉;(2)本次研究矿脉中原生流体包裹体类型主要为富CO_2三相水溶液包裹体、含CO_2三相水溶液包裹体及气液两相水溶液包裹体,而矽卡岩晚期硫化物脉中除上述三种类型外还发育含子晶三相水溶液包裹体;(3.成矿流体均一温度分布范围为204～426℃,盐度为1.0%～14.2%NaCleqv,整体表现为中高温、中低盐度的NaCl-CO_2-H_2O流体体系,而矽卡岩晚期硫化物脉成矿流体体系具有中温、中高盐度的特征;(4)该矿脉中石英的δ^(18)O、δD范围分别为7.5‰～9.4‰与-102.0‰～-75.0‰,指示岩浆水来源,而矽卡岩晚期硫化物脉具有岩浆水和大气水混合来源。本次研究的多金属硫化物矿脉δ^(3.)S值范围为-0.97‰～1.40‰,与矽卡岩期和矽卡岩晚期硫化物脉中黄铁矿S同位素一致,表明多期矿化成矿物质均具有幔源贡献。结合北衙矿集区成岩成矿动力学背景,推测始新世大规模地壳拆沉、软流圈上涌导致的强烈的壳幔相互作用可能是北衙金矿多期成矿作用的诱因。

关键词：流体包裹体 H-O-S同位素多期热液成矿北衙扬子西缘

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中国东北地区显生宙岩浆作用和洋-陆格局及其与气候演变的关系

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岩石学报 2022年第5期38卷 1443-1459页

作者：杨浩葛文春纪政井佳浩董玉景妍吉林大学地球科学学院长春130061 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029

显生宙期间,地球经历了温室-冰室气候的周期性交替变化。在数百万年的时间尺度,这种古气候的转变被认为是碳源和碳汇过程耦合的结果,但一直以来关于两者贡献程度的认识尚不明确。通过全球统计分析,不同学者提出大陆弧火山脱气模型和热带... 详细信息

显生宙期间,地球经历了温室-冰室气候的周期性交替变化。在数百万年的时间尺度,这种古气候的转变被认为是碳源和碳汇过程耦合的结果,但一直以来关于两者贡献程度的认识尚不明确。通过全球统计分析,不同学者提出大陆弧火山脱气模型和热带弧-陆碰撞模型用于解释整个显生宙古气候的演变,分别强调了碳源和碳汇的一级控制作用。为了检验上述模型,更好地理解古气候的转变机制和演化细节,本文系统总结了中国东北地区显生宙岩浆作用-矽卡岩型矿床的时空展布和构造背景,以及弧-陆碰撞的时代、规模和古地理位置,通过数据统计和作图对比,发现东北地区岩浆作用-矽卡岩成矿峰期、弧-陆碰撞缝合带的时空迁移与大气圈CO_(2)浓度和大陆冰川沉积有很好的对应关系,暗示东北显生宙构造-岩浆过程和古气候演变的内在联系。综合东北地区及全球的研究进展,本文提出如下倾向性认识:1)洋-陆俯冲过程中火山-变质脱气的强度决定了CO_(2)排放量,而热带区域弧-陆碰撞缝合带的规模决定了全球硅酸盐风化速率和CO_(2)吸收量,在地质演化过程中两者紧密联动,共同控制了显生宙古气候的演变;2)大陆弧岩浆作用的全球爆发不一定能造成温室气候的出现,如果缺乏充分矽卡岩变质脱碳反应,大陆弧CO_(2)排放通量与岛弧、大洋中脊和板内并无显著区别;3.SO_(2)属于短期效应气体,理论和实例研究均暗示爆发式火山作用难以诱发大冰期的形成,火山作用之于长期气候应该仍是促使地球升温而非变冷。

关键词：中国东北显生宙气候变化大陆弧矽卡岩弧-陆碰撞

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哀牢山—红河剪切带中流体记录及地质意义

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地学前缘 2019年第2期26卷 42-57页

作者：陈宇曹淑云邓友国程雪梅吕美霞董彦龙中国地质大学(武汉)地质过程与矿产资源国家重点实验室中国地质大学(武汉)地球科学学院湖北武汉430074

剪切带作为大陆岩石圈中的局部高应变带,是岩石变质-变形作用和流体活动的重要场所。沿着哀牢山—红河走滑剪切带内发育的点苍山深变质杂岩,保存了新生代以来极其丰富的构造-热演化信息。在点苍山杂岩体内出露有一系列具有不同构造特征... 详细信息

剪切带作为大陆岩石圈中的局部高应变带,是岩石变质-变形作用和流体活动的重要场所。沿着哀牢山—红河走滑剪切带内发育的点苍山深变质杂岩,保存了新生代以来极其丰富的构造-热演化信息。在点苍山杂岩体内出露有一系列具有不同构造特征的石英脉,我们选取了遭受剪切变形的石英脉作为主要研究对象,在野外构造观测和室内显微构造特征分析的基础上,利用傅立叶变换红外光谱(FTIR)、激光拉曼显微光谱(LRM)以及流体包裹体技术(FI)对其开展了进一步的精细研究。研究结果表明:(1)变形石英脉在显微镜下具有不同类型的塑性变形特征,其中以强烈细粒化和动态重结晶为主要特征的石英颗粒中包裹体类型主要为CO_2-H_2O包裹体和纯CO_2流体包裹体,包裹体多沿颗粒边界分布;在以条带状和细粒化为主要特征且具有典型核-幔构造的石英颗粒中,重结晶颗粒基本不含流体包裹体,石英条带中含有大量水溶液包裹体;在定向拉长的粗颗粒石英中其变形行为主要表现为波状消光和局部应变导致的塑性流动构造,在该类型石英颗粒中只含有水溶液包裹体且无明显分布特征。(2)根据各类流体包裹体测温数据估算出包裹体捕获温压为500～550℃、260～290MPa,深度约为10km,其流体来源主要为变质流体,剥露过程中的快速降压使得流体发生相分离及变形作用并导致的水丢失,这是CO_2-H_2O包裹体与水溶液包裹体出现的主要原因。(3.石英脉中的石英颗粒除含有一定量的包裹体水之外还含有少量的结构水,水在颗粒内部的分布为非均匀状态,通常边部水含量高于核部,同时水的分布特征和含量可随包裹体的变化而改变。(4)重结晶石英颗粒中的包裹体常在颗粒边界富集,认为其边界局部流体压力和流体的渗透或释放能弱化晶体平面,促进晶格位错滑移和溶解蠕变。

关键词：点苍山变质杂岩变形石英脉流体包裹体傅立叶变换红外光谱激光拉曼显微光谱

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Sub-percent precision measurement of neutrino oscillation parameters with JUNO

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Chinese Physics C 2022年第12期46卷 28-49页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Rizwan Ahmed Sebastiano Aiello Muhammad Akram Abid Aleem Fengpeng An Qi An Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde Marcondes de André Didier Auguste Weidong Bai Nikita Balashov Wander Baldini Andrea Barresi Davide Basilico Eric Baussan Marco Bellato Antonio Bergnoli Thilo Birkenfeld Sylvie Blin David Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Jose Busto Ilya Butorov Anatael Cabrera Barbara Caccianiga Hao Cai Xiao Cai Yanke Cai Zhiyan Cai Riccardo Callegari Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Chi Chan Jinfan Chang yun Chang Guoming Chen Pingping Chen Po-An Chen Shaomin Chen Xurong Chen Yixue Chen yu Chen Zhiyuan Chen Zikang Chen Jie Cheng Yaping Cheng yu Chin Cheng Alexey Chetverikov Davide Chiesa Pietro Chimenti Artem Chukanov Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti Di Lorenzo Daniele Corti Flavio Dal Corso Olivia Dalager Christophe De La Taille Zhi Deng Ziyan Deng Wilfried Depnering Marco Diaz Xuefeng Ding Yayun Ding Bayu Dirgantara Sergey Dmitrievsky Tadeas Dohnal Dmitry Dolzhikov Georgy Donchenko Jianmeng dong Evgeny Doroshkevich Marcos Dracos Frédéric Druillole Ran Du Shuxian Du Stefano Dusini Martin Dvorak Timo Enqvist Heike Enzmann Andrea Fabbri donghua Fan Lei Fan Jian Fang Wenxing Fang Marco Fargetta Dmitry Fedoseev Zhengyong Fei Li-Cheng Feng Qichun Feng Richard Ford Amélie Fournier Haonan Gan Feng Gao Alberto Garfagnini Arsenii Gavrikov Marco Giammarchi Nunzio Giudice Maxim Gonchar Guanghua Gong Hui Gong yuri Gornushkin Alexandre Göttel Marco Grassi Vasily Gromov Minghao Gu Xiaofei Gu yu Gu Mengyun Guan yuduo Guan Nunzio Guardone Cong Guo Jingyuan Guo Wanlei Guo Xinheng Guo yuhang Guo Paul Hackspacher Caren Hagner Ran Han Yang Han Miao He Wei He Tobias Heinz Patrick Hellmuth yuekun Heng Rafael Herrera yuenKeung Ho Yerevan Physics Institute YerevanArmenia UniversiéLibre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro Rio de JaneiroBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa Maria ValparaisoChile beijing Institute of Spacecraft Environment Engineering BeijingChina beijing Normal university BeijingChina china Institute of Atomic Energy BeijingChina Institute of High Energy Physics BeijingChina North china Electric Power university BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua university BeijingChina university of Chinese Academy of Sciences BeijingChina Jilin university ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing university ChongqingChina dongguan university of Technology DongguanChina Jinan university GuangzhouChina Sun Yat-Sen university GuangzhouChina Harbin Institute of Technology HarbinChina university of Science and Technology of china HefeiChina The Radiochemistry and Nuclear Chemistry Group in university of South china HengyangChina Wuyi university JiangmenChina Shandong university JinanChinaand Key Laboratory of Particle Physics and Particle Irradiation of Ministry of EducationShandong UniversityQingdaoChina Institute of Modern Physics Chinese Academy of SciencesLanzhouChina Nanjing university NanjingChina Guangxi university NanningChina East china university of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai university TianjinChina Wuhan university WuhanChina Xi'an Jiaotong university Xi'anChina Xiamen university XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou

JUNO is a multi-purpose neutrino observatory under construction in the south of *** publication presents new sensitivity estimates for the measurement of the △m_(3.)^(2),△m_(21)^(2),sin^(2)θ_(12),and sin^(2)θ_(13. oscillation parameters using reactor antineutrinos,which is one of the primary physics goals of the *** sensitivities are obtained using the best knowledge available to date on the location and overburden of the experimental site,the nuclear reactors in the surrounding area and beyond,the detector response uncertainties,and the reactor antineutrino spectral shape constraints expected from the TAO satellite *** is found that the △m_(21)^(2) and sin^(2)θ_(12) oscillation parameters will be determined to 0.5%precision or better in six years of data *** the same period,the △m_(3.)^(2) parameter will be determined to about 0.2%precision for each mass ordering *** new precision represents approximately an order of magnitude improvement over existing constraints for these three parameters.

关键词： neutrino oscillation reactor antineutrino precision measurement JUNO

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