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CARBONATITES FROM THE EASTERN HIMALAyan SYNTAXIS: PETROLOGY AND TECTONIC IMPLICATIONS

地学前缘 2000年第S1期7卷 10-11页

作者： liu yan 1, zhong dalai 2, ji jianqing 3.1 institute of geology, {3. academy of geological Sciences, beijing 10003., china 2 institute of geology & Geophysics, {3. academy of Sciences, beijing 100029, china 3.Department of geology, Pek

Most carbonatites occur in relatively stable, intra\|plate areas but some are found to occur in near to plate margins and may be linked with plate separation (Woolley, 1989). Although many carbonatites have been discovered to occur in the orogenic belts in recent years, most of these rocks are related to post\|orogenic magmatism, that is, the rocks occur in the specially extensional setting. Therefore it is unusual that such magmatic rocks occur in the typical convergent environment. Here we report carbonatites and associated ultramafic and mafic rocks in the core of the eastern Himalayan syntaxis. The eastern Himalayan syntaxis consists of three tectonic units: the Gangdise, the Yarlung Zangbo, and the Himalayan units, each of which is bounded by faults ({3. & zhong, 1997). The Himalayan unit, the northernmost exposed part of the Indian plate, is divided into two complexes, the amphibolite facies complex in the south and the granulite facies complex in the north. The granulite facies complex in the Himalayan unit have been argued to experience high\|pressure metamorphism and represent materials buried to upper\|mantle depths ({3. & zhong, 1997). The carbonatites and associated ultramafic and mafic rocks only occur in the granulite facies rocks and are divided into two belts: northern and southern *** northern belt extends at least 3.km, and is about 20km in width. The southern belt extends several kilometers, and is 3.m or so in width. Each belt consists mainly of differently compositional dykes, extending parallel to gneissosity of granulite facies gneiss. Carbonatitic agglomerates are observed in the northern belt. From the center of carbonatite dykes to country rocks, five types of rock are observed: the center parts of carbonatites, the rim parts of carbonatites, ultramafic and mafic rocks, altered rocks and country rocks. The gneissosity of country rock was deformed by intrusion of dykes.

关键词： Eastern Himalayan Syntaxis carbonatites ultramafic rocks carbonatitie magmatism convergent environment

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Characterization of rock thermophysical properties and factors affecting thermal conductivity−A case study of Datong Basin,china

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Journal of Groundwater Science and Engineering 2024年第1期12卷 4-15页

作者： Meng-lei ji Shuai-chao Wei Wei Zhang Feng liu Yu-zhong Liao Ruo-xi Yuan Xiao-xue {3. Long Li institute of Hydrogeology and Environmental geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China china University of Geosciences(beijing) Beijing 100083China

Rock thermal physical properties play a crucial role in understanding deep thermal conditions,modeling the thermal structure of the lithosphere,and discovering the evolutionary history of sedimentary *** advancements in geothermal exploration,particularly the identification of high-temperature geothermal resources in Datong Basin,Shanxi,china,have opened new *** study aims to characterize the thermal properties of rocks and explore factors influencing thermal conductivity in basins hosting high-temperature geothermal resources.A total of 70 groups of rock samples were collected from outcrops in and around Datong Basin,Shanxi *** property tests were carried out to analyze the rock properties,and the influencing factors of thermal conductivity were studied through experiments at different temperature and water-filled *** results indicate that the thermal conductivity of rocks in Datong,Shanxi Province,typically ranges from 0.690 W/(m·K)to 6.460 W/(m·K),the thermal diffusion coefficient ranges from 0.441 mm^(2)/s to 2.023.mm^(2)/s,and the specific heat capacity of the rocks ranges from 0.569 KJ/(kg·℃)to 1.117 KJ/(kg·°C).Experimental results reveal the impact of temperature and water saturation on the thermal conductivity of the *** thermal conductivity decreases with increasing temperature and rises with high water saturation.A temperature correction formula for the thermal conductivity of different lithologies in the area is proposed through linear *** findings from this study provide essential parameters for the assessment and prediction,development,and utilization of geothermal resources in the region and other basins with typical high-temperature geothermal resource.

关键词： Datong Basin Rock thermal conductivity Thermal diffusivity Specific heat capacity Influencing factors

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Experimental study of the influencing factors and mechanisms of the pressure-reduction and augmented injection effect by nanoparticles in ultra-low permeability reservoirs

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Petroleum Science 2024年第3期21卷 1915-1927页

作者： Pan Wang Yu-Hang Hu Liao-Yuan Zhang Yong Meng Zhen-Fu Ma Tian-Ru Wang Zi-Lin Zhang ji-Chao Fang Xiao-Qiang liu Qing You yan Zhang beijing Key Laboratory of Unconventional Natural Gas geological Evaluation and Development Engineering China University of Geosciences(Beijing)Beijing100083China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Petroleum Engineering Technology Research institute Sinopec Shengli Oilfield CompanyDongying257000ShandongChina Hekou Oil Production Plant Sinopec Shengli Oilfield CompanyDongying257200ShandongChina Petroleum Exploration and Production Research institute SINOPECBeijing102206China CNPC Engineering Technology R&D Company Limited Beijing102206China

Nanoparticles(NPs)have gained significant attention as a functional material due to their ability to effectively enhance pressure reduction in injection processes in ultra-low permeability *** are typically studied in controlled laboratory conditions,and their behavior in real-world,complex environments such as ultra-low permeability reservoirs,is not well understood due to the limited scope of their *** study investigates the efficacy and underlying mechanisms of NPs in decreasing injection pressure under various injection conditions(25—85℃,10—25 MPa).The results reveal that under optimal injection conditions,NPs effectively reduce injection pressure by a maximum of 22.77%in core *** pressure reduction rate is found to be positively correlated with oil saturation and permeability,and negatively correlated with temperature and ***,particle image velocimetry(PIV)experiments(25℃,atmospheric pressure)indicate that the pressure reduction is achieved by NPs through the reduction of wall shear resistance and wettability *** work has important implications for the design of water injection strategies in ultra-low permeability reservoirs.

关键词： Nanoparticle Pressure reduction Augmented injection Ultra-low permeability reservoir

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Zircon SHRIMP U-Pb Ages,Geochemistry and Nd-Hf Isotopes of~1.0 Ga A-Type Felsic Rocks in the Southwestern yangtze Block,South china:Petrogenesis and Tectonic Implications

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Journal of Earth Science 2023年第2期34卷 504-517页

作者： ji-Biao Zhang Xiao-zhong Ding yan-Xue {3. institute of geology Chinese Academy of Geological SciencesBeijing 100037China

The petrogenesis and tectonic affinity of Late Mesoproterozoic igneous rocks in the yangtze Block are important to understand its tectonic evolution within the context of the Rodinia supercontinent’s ***,we report the SHRIMP zircon U-Pb ages,geochemistry,and Nd-Hf isotopic data for dacite from the Zegu Formation of the Dengxiangying Group in southwestern yangtze *** crystallization age of the Zegu dacite is 103. *** rocks have relatively high Ga,Zr,Hf,and HREE contents,as well as high(10000×Ga)/Al(2.7-2.9)and FeOt/MgO(3.8-10.5)ratios,showing a geochemical affinity of A-type ***,they are characterized by negativeεNd(t)(-3.6 to-7.5)and zirconεHf(t)values(-0.3.to-14.4),indicating that they likely generated via partial melting of an ancient continental crust *** tectonic discriminant diagrams showed that the Zegu dacites have high Y and Nb contents(plotted in the‘within-plate’magmatic rocks field).In conclusion,the geochemistry and isotopic data indicated that the 103. Ma felsic volcanic rock in the Dengxiangying Group generated during an intra-plate rift basin along a passive *** work thus argues against a Grenvillian orogen’s existence in the yangtze *** view of the subsequent Neoproterozoic subduction-related magmatism in the region,we suggest that the yangtze Block might have been along the periphery of the Rodinia.

关键词： A-type granotoids zircon SHRIMP U-Pb dating intra-plate magmatism Late Mesoproterozoic Southwestern yangtze Block geochemistry

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平原M5.5地震土壤气地球化学特征及成因

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地震地质 2024年第2期46卷 433-448页

作者：苏淑娟陈其峰孙豪刘军冯梁乐徐继龙杨彦明雒昆利山东省地震局济南250000 中国科学院地理科学与资源研究所北京100101 内蒙古自治区地震局呼和浩特010010 中国地震局地质研究所地震动力学国家重点实验室北京100029

2023.8月6日2时3.分,山东省德州市平原县发生M5.5地震。文中跨震中布设4条长3.km的勘测线,现场测量了土壤气Rn、CO_(2)和Hg浓度。结果表明:1)土壤气浓度表现出明显的空间差异,震中区与4条测线的东、西两端气体浓度相对较高。2)土壤气... 详细信息

2023.8月6日2时3.分,山东省德州市平原县发生M5.5地震。文中跨震中布设4条长3.km的勘测线,现场测量了土壤气Rn、CO_(2)和Hg浓度。结果表明:1)土壤气浓度表现出明显的空间差异,震中区与4条测线的东、西两端气体浓度相对较高。2)土壤气浓度的空间分布特征在震中及其东部地区相似,但在震中西部差异较大,在西部旧城断裂(F_(3.)附近,Rn和CO_(2)的浓度高于震中区,推测应与地震活动和F_(3.控制的鼻状构造有关。3.Rn、CO_(2)和Hg的浓度在陵县-冠县断裂(F_(1))和F_(3.附近出现高值异常,余震自F_(1)向F_(3.发展,结合地质与地球物理研究资料推断,平原M5.5地震应与F_(1)和F_(3.共同作用有关。以上结果表明,气体地球化学方法能较好地指示隐伏断层的位置与展布方向。

关键词：平原M5.5地震断层土壤气浓度陵县-冠县断裂旧城断裂构造地球化学

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从地球化学角度看微亮晶臼齿碳酸盐岩形成的环境条件——以吉辽地区新元古代微亮晶碳酸盐岩为例

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天然气地球科学 2004年第2期15卷 150-155页

作者：旷红伟金广春刘燕学孟祥化葛铭长江大学地球物理系湖北荆州434023 长江大学地球化学系地球化学重点实验室湖北荆州434023 中国地质科学院地质所北京100037 中国地质大学沉积盆地研究所北京100083

近年来随着对前寒武纪研究的进一步开展,中晚元古代地层的一种被称为"臼齿碳酸盐岩[MolarTooth(简称MT)Carbonates]"或"微亮晶碳酸盐岩"或"臼齿构造(MolarToothStructure,简称MTS)"的沉积现象受到了国际地学界的重视。臼齿碳酸盐岩特指... 详细信息

近年来随着对前寒武纪研究的进一步开展,中晚元古代地层的一种被称为"臼齿碳酸盐岩[MolarTooth(简称MT)Carbonates]"或"微亮晶碳酸盐岩"或"臼齿构造(MolarToothStructure,简称MTS)"的沉积现象受到了国际地学界的重视。臼齿碳酸盐岩特指由微亮晶方解石组成、具肠状褶皱席(Ptygmaticallyfoldedsheets)构造的元古代碳酸盐岩。臼齿碳酸盐岩在地质历史中扮演着重要的角色,其似乎成了早元古代火山喷发热水沉淀碳酸盐与显生宙带壳化石碳酸盐沉积之间的桥梁,更重要的是在地球生命演化中起着重要的作用。利用现代测试手段和方法对吉辽地区新元古代含臼齿碳酸盐岩地层剖面砂岩的氧化物含量、稀土元素和臼齿碳酸盐岩的碳同位素、氧同位素、锶同位素、生物标志物、能谱进行了分析,从地球化学角度揭示了臼齿碳酸盐岩形成的构造背景、古温度场、形成时限、物质组分和沉积环境特征等,从而印证了沉积学研究成果:吉辽地区的臼齿碳酸盐岩主要发育在新元古代地层中,大约在750～900Ma左右;MT形成于华北地台稳定构造背景之下低纬度、古水温一般在50℃左右的热带气候条件下的内缓坡环境中;MT由微亮晶方解石和基质两部分组成。

关键词：地球化学微亮晶碳酸盐岩吉辽地区新元古代

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The primary dolostone in the Meso-Neoproterozoic:Cases study on platforms in china

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Journal of Palaeogeography 2022年第2期11卷 151-172页

作者： Zhi-Dong Bao Han-Cheng ji Yuan Wang Zong-Feng Li Ting Liang Bo Niu Ming-yang Wei Kai Lu yan-Qing Shi Hua Zhang Pu Wan Zhuo-Lun Li Zhi-Bo yang Rui liu Can-Xing liu Xu-Lin zhong Xiao-Qi Guo Peng-Fei Xiang zhong-Xian Cai Shui-Chang Zhang china University of Petroleum(beijing) Beijing 102249China State Key Laboratory of Petroleum Resources and Prospecting Ministry of EducationBeijing 102249China china University of Geosciences(Wuhan) Wuhan 430074China Petro china Research institute of Petroleum Exploration and Development Beijing 100083China

Meso-Neoproterozoic dolostone is abnormally well-developed in the platform areas in china,detailly,in the Mesoproterozoic Calymmian Wumishan Formation of North china Basin,Neoproterozoic Ediacaran Qigbulak Formation of Tarim Basin,and the Neoproterozoic Ediacaran Dengying Formation of Sichuan *** outcrops and drilling cores from these basins show that these dolostones are mostly thick-bedded to massive,with mud-sized to silt-sized crystalline dolostone reaching 86%-97%of the total dolostone *** dolostones basically suffered no secondary metasomatism,regardless of containing microorganisms(such as algae and bacteria)or *** analyses of sedimentary palaeogeographic features indicate that:(1)the Meso-Neoproterozoic dolostone nearly covered the entire area basins,and was widely deposited in supratidal to intertidal zones,as well as in open platform environments;(2)the dolostone was subdivided according to the crystalline size,with the distribution controlled by geomorphology,i.e.,the pure mud-sized crystalline dolostone developing in depression areas,whereas the grainy mud-sized crystalline dolostone or the mound stromatolitic mud-sized crystalline dolostone developing in uplift areas;(3.deep-water basins developed between the carbonate platforms,and the seismic profiles show that these basins were formed by syngenetic deep faults in the Meso-Neoproterozoic *** syngenetic faults increased Mg^(2+)concentration in the seawater by injecting rich-Mg2+-bearing hydrothermal fluids into the carbonate *** analyses of geochemical and paleoclimatic indexes reveal that there is no obvious difference in carbon and oxygen isotope ratios between dolostones having different textures,with the ratios similar to those of the global seawater of the Meso-Neoproterozoic,indicating that the silt-sized crystalline dolostone has the same sedimentary origin as the mud-sized crystalline dolostone,i.e.,the former is from authigenic recrystallization of the

关键词： Thick-bedded to massive dolostone C-O isotopes Meso-Neoproterozoic Tarim basin Sichuan basin North china Basin

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Zircon SHRIMP U-Pb dating of the Neogene coral reefs,Xisha Islands,South china Sea:implications for tectonic evolution

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china geology 2018年第1期1卷 49-60页

作者： Hong Xu Zhao-peng ji Shan-ying Lie yan-qiou yang Shou-jie liu Hai-yang Zhang Shu-shen Lu Tong-qiang Shi Meng Tao Na Qin Wei-wei Zhang Da-peng Su Long-wei Qiu Qingdao institute of Marine geology China Geological SurveyQingdao 266071China Key Laboratory of Marine Sedimentology and Enwronmental geology First Institute of OceanographyQingdao 266061China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Geosciences China University of Petroleum (East China)Qingdao 266580China Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China beijing SHRIMP Center Instrtute of GeologyChinese Academy of Geological SciencesBeijing 100037China

The Xisha Block is a minor one in the South china Sea and an important tectonic unit in the northwestern part of the *** SHRIMP U-Pb ages for three volcanic intrusive core samples from Xike-1,an exploratory well penetrating the bioherms of the Xisha *** core samples are from the Miocene reef carbonate bedrock and are recognized as dark-gray biotite-hornblende gabbro,gray fne-grained biotite diorite,and gray fine-grained granite,*** cathodoluminescence (CL)images and trace Th,U and Pb compositions of the zircons show that these rocks are of volcanic intrusive *** SHRIMP U-Pb dating yielded six groups of ages,ranging from 2451-1 857 Ma to early Cretaceous, which indicate that the formation and evolution of the Xisha Block was affected by the evolution and closure of Neotethys Ocean,probably within its eastern extension into South china *** old,deepsourced material,including fragments from Rodina supercontinent,and recent mantle-derived magma products contributed to the emergence and formation of the Xisha *** SHRIMP U-Pb results also proved that this process differed from that of the Kontum massif,the Hainan Block,and the South china Block,but is similar to that of the Nansha and {3.sha *** process was associated with the effects of yanshanian magmatism induced by subduction mechanisms of the Paleo-Pacific Plate or the reworking of the multiple magmatisms since the Early to mid-yanshanian,possibly jointly experienced by the Xisha-{3.sha-Nansha Block.

关键词： Geochronology Volcamc intrusive rocks Zircon SHRIMP U-Pb dating Rodma supercontment Xisha Block South china Sea

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Sedimentary and tectonic evolution of the Banquan pull-apart basin and implications for late Cenozoic dextral strike-slip movement of the Tanlu Fault Zone

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Science china Earth Sciences 2023年第4期66卷 797-820页

作者： Peng SHU Xiwei XU Shaoying FENG Baojin liu Kang LI Paul TAPPONNIER Xiaojuan DENG Guihua CHEN Nuan XIA Hongtai XU jingjing QIN Fubing HE yan MA Rongzhang ZHENG State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Anhui Earthquake Agency Hefei 230031China Mengcheng National Geophysical Observatory Anhui Earthquake AgencyMengcheng 233500China National institute of Natural Hazard Ministry of Emergency Management of the People’s Republic of ChinaBeijing 100085China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Seismic Hazard Mitigation Center of Shandong Province(Engineering Seismology Research Center of Shandong Province) Ji’nan 250014China beijing institute of geological Survey Beijing 100195China

The Banquan Basin is a pull-apart basin with the largest scale and the most prominent structure due to dextral slip of the Tanlu Fault Zone(TLFZ) in late Cenozoic. The depositional history of the basin records the start time and evolution of the right-lateral strike-slip movement of the TLFZ. This paper studies the sedimentary and tectonic evolution of the Banquan Basin by seismic reflection exploration, borehole detection and cosmogenic nuclide chronology. We analyze the coupling relationship between the pull-apart basin and the strike-slip fault and discuss the start time and tectonic significance of the right-lateral strikeslip of the TLFZ. Our study indicates that the Banquan Basin has undergone three evolutionary stages: weak rifting during the pre-pull-apart period, strong extension during the syn-pull-apart period and subsidence during the post-pull-apart period. This implies that the TLFZ, which controls the evolution of the basin, experienced an evolutionary process of weak activity,intensified activity and migration of activity toward the central basin. The sedimentary filling of the basin has strong response to the episodic pull-apart and extension of the basin. Lying upon the basement of the basin, a thin layer of Miocene mudstone slowly accumulated due to local rifting before the strong pull-apart event. Along with the dextral slipping and pull-apart process, the basin was filled with alluvial fan facies, fluvial facies and floodplain facies strata from bottom to top. The latest tectonic movement of the TLFZ in the North china Block in late Cenozoic was dominated by episodic dextral strike-slip motion, and this deformation pattern started at 4.01±1.27 Ma. The latest tectonic deformation in North china since late Cenozoic was governed by eastward extrusion and tectonic orogenesis of the eastern margin of the Qinghai-Xizang Plateau since late Miocene. The eastward thrusting of the liupanshan fault zone and sinistral shearing of the Qinling fault zone led

关键词： Banquan Basin Strike-slip movement Pull-apart basin Tanlu Fault Zone North china Plain Start time

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蒙古阿尔泰哈勒赞布勒格泰碱性岩有关的Zr-Nb-Ta-REE矿床地质特征、地球化学与成因初探

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岩石学报 2023年第11期39卷 3210-3228页

作者：刘翼飞江思宏陈雷张伟波曹会季根源张博辉闫鹏程中国地质科学院矿产资源研究所北京100037 中国地质调查局发展研究中心北京100037 内蒙古西金矿业有限公司巴彦浩特750300

哈勒赞布勒格泰稀有稀土矿床产出于蒙古国阿尔泰地区,是一处与碱性杂岩体有关的超大型Zr-Nb-Ta-REE矿床。该杂岩体具有多期次侵位和多岩相的特征,主要由含钠铁闪石和霓石的碱长正长岩、英碱正长岩、碱长花岗岩、蚀变碱长花岗岩和碱长花... 详细信息

哈勒赞布勒格泰稀有稀土矿床产出于蒙古国阿尔泰地区,是一处与碱性杂岩体有关的超大型Zr-Nb-Ta-REE矿床。该杂岩体具有多期次侵位和多岩相的特征,主要由含钠铁闪石和霓石的碱长正长岩、英碱正长岩、碱长花岗岩、蚀变碱长花岗岩和碱长花岗伟晶岩等组成,并被碱性辉长岩和辉绿岩侵入。其中,蚀变碱长花岗岩发生了全岩Zr、Nb、Ta和REE矿化,并具有广泛的热液交代特征。LA-ICP-MS锆石U-Pb测年显示,该杂岩体中的长英质碱性岩和基性碱性岩具有相似的侵位年龄,均为~400Ma,侵入于~463.a的黑云母正长花岗岩中。主微量元素地球化学研究显示,该杂岩体具有强过碱性的特征。岩浆演化主要受到碱性长石分异的控制,使硅逐渐聚集于晚期粒间熔体之中,并逐渐演化为英碱正长岩和碱长花岗岩。这个过程使岩浆的过碱性特征不断加强,也使钠铁闪石和霓石逐渐富集。杂岩体的岩浆演化经历了一定程度的锆石、富集稀土的磷灰石、独居石和磷钇矿以及富集Nb的异性石的分异,使Zr、Nb、Ta和REE等成矿元素在岩浆的演化过程中没有得到显著的富集,因此岩浆的演化并非是该杂岩体中稀有稀土元素发生矿化的关键因素。在蚀变碱长花岗岩的石英、碱性长石和钠铁闪石中,普遍发育顺着晶格生长的“雪球状”钠长石,是碱性花岗质共结岩浆演化晚期流体发生周期性饱和并释放,造成Ab周期性过饱和而沉淀的结果。流体的周期性过饱和及释放萃取成矿元素并汇聚于蚀变碱长花岗岩,造成其Zr、Nb、Ta和REE等元素与硅含量相似但未发生蚀变的碱长花岗岩相比富集了近10倍,因此这是发生矿化的根本原因。

关键词： REE矿床稀有金属矿床碱性杂岩关键金属阿尔泰蒙古国

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