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Journal of Earth Science 2024年第4期35卷 1373-1377页

作者： Xingkai Zhang Shao-Yong Jiang Hui-Min Su Wei Wang Qinglin Xia Yunpeng Liu Shien Li State Key Laboratory of geological Processes and Mineral Resources Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesSchool of Earth ResourcesChina University of GeosciencesWuhan 430074China Third geological exploration Institute of Qinghai nonferrous geological and Mineral exploration bureau Xining 810000China

Tin,as one of the most important critical metals,has at-tracted great attention worldwide(Jiang et al.,2023,2020).China has the largest amount of tin resources in the world,ac-counting for nearly one-fourth of the world’s total(Jiang et al.,2020;Chen and Sheng,2015).Tin deposits in China mainly occur in the Nanling Range in southern China,the Sanjiang Basin in southwestern China,and the Great Xing’an Range in northeastern China,which account for 98%of the country’s tin resources,whereas tin deposits are relatively rare in north-western China(Ni et al.,2023;Chen et al.,2014,1992).

关键词： Middle northeastern southwestern

Origin and geological Significance of the Cambrian-Permian Mafic-felsic Magmatic Rocks in the Longshenggeng Area of the East Kunlun Orogenic Belt

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Journal of Earth Science 2024年

作者： Li Hua Su Huimin Tong Haikui Luo Changhai Zhang Jianxin Wang Tao Li Wenjun Xue Chaoping Dong Jiaxiang Che Yuying Chen Xiaolin Li Xiong Qinghai Provincial bureau geological Survey bureau， MNR Technology Innovation Center for exploration and Exploitation for Strategic Mineral Resources in Plateau Desert Region State Key Laboratory of geological Processes and Mineral Resources， Collaborative Innovation Center for exploration of Strategic Mineral Resources， School of Earth Resources， China University of Geosciences Northwest bureau of China Metallurgical Geology bureau The Third geological exploration Institute of nonferrous Metals Xining

A set of ultramafic-mafic-felsic rock assemblages was discovered in the Longshenggeng area of the eastern part of the East Kunlun Orogenic Belt. Petrography， chronology and whole-rock geochemistry were conducted on this set of intrusive rock assemblages. U-Pb dating of apatite shows that the lherzolite formed at (492 ± 5) Ma， the granite at (473 ± 6) Ma， and the diabase at (260 ± 14) Ma， respectively. The lherzolites belong to a Supra-Subduction Zone type (SSZ-type) ophiolite component above a subduction zone; the granites formed in an ocean-continent subduction setting; and the diabases represent products of partial melting of an asthenospheric mantle at shallow depth. The East Kunlun Orogenic Belt features the East Kunzhong and Buqingshan-Animaqing ophiolitic melange belts， with the latter representing remnants of the Proto-Tethys Ocean. The late Cambrian lherzolites and granites in the Longshenggeng area were magmatic products of the back-arc ocean basin and island arc formed during the northward subduction of the Proto-Tethys Ocean. Subsequently， extensive island arc magmatism occurred from the late Permian to middle Triassic， driven by the northward subduction of the Paleo-Tethys Ocean beneath the East Kunlun Block. The diabase may have formed during the transition from subduction to post-collisional extension.

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Discontinuity development patterns and the challenges for 3D discrete fracture network modeling on complicated exposed rock surfaces

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2154-2171页

作者： Wen Zhang Ming Wei Ying Zhang Tengyue Li Qing Wang Chen Cao Chun Zhu Zhengwei Li Zhenbang Nie Shuonan Wang Han Yin College of Construction Engineering Jilin UniversityChangchun130026China liaoning nonferrous geological exploration and Research Institute Co. Shenyang110013China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China Northeastern University Shenyang110819China

Natural slopes usually display complicated exposed rock surfaces that are characterized by complex and substantial terrain undulation and ubiquitous undesirable phenomena such as vegetation cover and *** study presents a systematic outcrop research of fracture pattern variations in a complicated rock slope,and the qualitative and quantitative study of the complex phenomena impact on threedimensional(3D)discrete fracture network(DFN)*** the studies of the outcrop fracture pattern have been so far focused on local variations,thus,we put forward a statistical analysis of global *** entire outcrop is partitioned into several subzones,and the subzone-scale variability of fracture geometric properties is analyzed(including the orientation,the density,and the trace length).The results reveal significant variations in fracture characteristics(such as the concentrative degree,the average orientation,the density,and the trace length)among different ***,the density of fracture sets,which is approximately parallel to the slope surface,exhibits a notably higher value compared to other fracture sets across all *** improve the accuracy of the DFN modeling,the effects of three common phenomena resulting from vegetation and rockfalls are qualitatively analyzed and the corresponding quantitative data processing solutions are ***,the 3D fracture geometric parameters are determined for different areas of the high-steep rock slope in terms of the subzone *** results show significant variations in the same set of 3D fracture parameters across different regions with density differing by up to tenfold and mean trace length exhibiting differences of 3e4 *** study results present precise geological structural information,improve modeling accuracy,and provide practical solutions for addressing complex outcrop issues.

关键词： Complicated exposed rock surfaces Discontinuity characteristic variation Three-dimensional discrete fracture network modeling Outcrop study Vegetation cover and rockfalls

Three-dimensional Modeling of Ore-forming Elements and Mineralization Prognosis for the Yechangping Mo Deposit,Henan Province,China

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Acta Geologica Sinica(English Edition) 2024年第3期98卷 736-752页

作者： DING Gaoming JI Genyuan YAN Guolong XU Yongzhong WANG Kunming XIAO Chun WANG Quanle GUO Dongbao China National Administration of Coal Geology Beijing 100038China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China China Gold Group geological Co. Ltd.Beijing 100011China China Gold Group ZhongYuan Mining Co. Ltd.SanmenxiaHenan 472000China Lanzhou Mineral exploration Institute of Gansu nonferrous Metal geological exploration bureau Lanzhou 730046China

Three-dimensional geochemical modeling of ore-forming elements is crucial for predicting deep *** approach provides key information for the quantitative prediction of deep mineral localization,three-dimensional fine interpolation,analysis of spatial distribution patterns,and extraction of quantitative mineral-seeking *** Yechangping molybdenum(Mo)deposit is a significant and extensive porphyry-skarn deposit in the East Qinling-Dabie Mo polymetallic metallogenic belt at the southern margin of the North China *** borehole data on oreforming elements underpin deep geochemical *** methodology includes the following steps:(1)Threedimensional geological modeling of the deposit was established.(2)Correlation,cluster,and factor analyses post delineation of mineralization stages and determination of mineral generation sequence to identify(Cu,Pb,Zn,Ag)and(Mo,W,mfe)assemblages.(3)A three-dimensional geochemical block model was constructed for Mo,W,mfe,Cu,Zn,Pb,and Ag using the ordinary kriging method,and the variational function was developed.(4)Spatial distribution and enrichment characteristics analysis of ore-forming elements are performed to extract geological information,employing the variogram and w(Cu+Pb+Zn+Ag)/w(Mo+W)as predictive indicators.(5)Identifying the western,northwestern,and southwestern areas of the mine with limited mineralization potential,contrasted by the northeastern and southeastern areas favorable for mineral exploration.

关键词： 3D geochemical model ore-forming elements geostatistics deep mineralization prediction Yechangping Mo deposit

Characteristics of orthorhombic anisotropic seismic response induced by horizontal in situ stress in vertical transversely isotropic media

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Science China Earth Sciences 2024年第7期67卷 2291-2310页

作者： Xinpeng PAN Chengxu LU Zhizhe ZHAO Jianxin LIU School of Geoscience and Info-Physics Central South UniversityChangsha 410083China Hunan Key Labraory of nonferrous Resources and geological Disaster exploration Central South University Changsha 410083China Key Laboratory of Metallogenic Prediction of nonferrous Metals and geological Environment Monitoring(Central South University) Ministry of EducationChangsha 410083China PowerChina Zhongnan Engineering Corporation Limited Changsha 410014China

Sedimentary strata typically exhibit the characteristics of transverse isotropy(VTI)with a vertical axis of ***,fractures in sedimentary strata tend to produce anisotropic closure due to horizontal in situ stress,resulting in pronounced orthorhombic anisotropy in VTI media under such stress conditions and influencing the propagation behavior of seismic *** studies have primarily focused on the elastic wave velocity anisotropy induced by applied stress in isotropic background media,neglecting the impact of VTI background media on the anisotropy induced by horizontal in situ stress and the response characteristics of seismic wave *** address these gaps,we first establish the effective elastic stiffness tensor of VTI media under horizontal in situ stress using nonlinear acoustoelastic ***,we derive the accurate and linearized approximate equations for P-wave seismic reflectivity of VTI media under horizontal in situ stress,based on wave equations and scattering theory,***,we compare and analyze the characteristics of orthorhombic anisotropic seismic response induced by horizontal in situ stress at various types of elastic reflection *** results demonstrate that the linearized approximation of the seismic reflection response characteristics closely aligns with the accurate equations under conditions of small stress below 10 MPa,effectively capturing the azimuth-dependent orthorhombic anisotropy induced by horizontal in situ stress in VTI *** results of this study also provide a novel theoretical approach and valuable insights into the seismic prediction of in situ stress.

关键词： Horizontal in situ stress Nonlinear acoustoelastic theory Linear slip theory Orthorhombic anisotropy Stress seismic prediction

High-precision modeling of tide-induced 3-D magnetic field and analysis of geomagnetic satellite orbit requirements

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Science China Earth Sciences 2024年第1期67卷 165-178页

作者： Zhengyong REN Cong YANG Hongbo YAO Xu TANG Jingtian TANG Keke ZHANG Key Laboratory of Metallogenic Prediction of nonferrous Metals and geological Environment Monitoring Ministry of Education Central South UniversityChangsha 410083China Hunan Key Laboratory of nonferrous Resources and geological Hazards exploration Changsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China

Ground-based magnetic observatories and geomagnetic satellites can observe the induced magnetic field generated by the motion of seawater containing sodium and chlorine *** the three-dimensional(3-D)spatial distribution of tide-induced magnetic fields(TIMF)is crucial for inverting the electrical conductivity structure of the oceanic *** also serves as an essential basis for designing optimal geomagnetic observatories and satellite ***,existing methods for simulating TIMF suffer from limitations in inaccurately modeling realistic coastlines,heterogeneous land and sea surface properties,and complex deep Earth structures,thereby the interpretational level of TIMF data is *** overcome this issue,we developed a tetrahedral-based finite element method for simulating TIMF,which can efficiently approximate realistic coastlines,heterogeneous land and sea surface properties,and complex deep Earth ***,we derived the boundary value problem for the seawater motion-induced electromagnetic field,which was solved using the vector finite element method based on tetrahedral ***,using the latest ocean depth and seafloor sediment layer models,we constructed a 3-D conductivity model of the Earth,which includes realistic coastlines,heterogeneous land and sea conductivity *** then computed the TIMF using the M_(2)tidal source as an example and validated our method by comparing it with results obtained from spherical harmonic finite element and integral equation ***,utilizing the computed high-precision M_(2),N_(2),and O1 TIMF signals,we marked global observatories capable of observing strong M_(2),N_(2),and O1 TIMF signals and predicted alternative stations suitable for tide signal ***,we calculated TIMF at heights of 450 and 200 km for the Macao Science Satellite 1 and its subsequent *** results indicate that the amplitude of the tidal-induced magnetic field at

关键词： Ocean motional induction Electromagnetic induction Ocean tides Geomagnetic satellite Macao Science Satellite 1

What Controls the Distribution of Ore Veins in Quartz Vein-type Tungsten Deposits: Constrains from Fan-shaped Mineralization in SE China

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Journal of Earth Science 2024年

作者： Gui-Cong Fang Deng-Hong Wang Fu-Qiang Yang Zhan-Xu Ni Chang-Shuai Huang Ping Wang Meng Feng Zuo-Hai Feng Guangxi Key Laboratory of Hidden Metallic Ore Deposits exploration， College of Earth Science， Guilin University of Technology Collaborative Innovation Center for exploration of nonferrous Metal Deposits and Efficient Utilization of Resources By the Province and Ministry，Guilin University of Technology Institute of Mineral Resources， Chinese Academy of geological Sciences Guangxi Zhuang Autonomous Region Institute of Geophysical exploration geological Team No.271 of Guangxi Zhuang Autonomous Region China nonferrous Metal Guilin Research Institute of Geology for Mineral Resources Co.， Ltd Guangdong Geologic Survey Institute

Quartz vein-type tungsten deposits are a common W deposit type. Their ore vein distribution was previously considered to be controlled by regional horizontal tectonic stress. In this paper， 14 tungsten deposits with fan-shaped mineralization in SE China are summarized， and the relations between their ore veins and granite and the ore-forming structural stress field are analyzed. These deposits have a post-magmatic hydrothermal genesis and involve the formation of two sets of veins with similar strike and opposite dips at the top of the ore-causative granite bodies， forming a vertical fan-shaped profile. Their ore veins were coeval with the underlying granite bodies， and generally extend along the long axis of the granite. In such fan-shaped ore formation， the stress is highly focused at the top of the granite and gradually weakens outward. The maximum principal stress (σ1) is perpendicular to the granite contact surface， and radiates outward from the pluton. Meanwhile， the minimum principal stress (σ3) forms an arc-shaped band parallel to the contact surface. Our findings， together with published numerical modeling indicate that the emplacement dynamics of granitic magma (rather than regional horizontal tectonic stress) are essential controls on the distribution of ore veins in quartz vein-type tungsten deposits.

关键词：

基于微震多参数的大规模岩体垮塌前兆特征研究

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Journal of Central South University 2024年第3期31卷 878-889页

作者：柳建新杨顺李磊潘新朋尹贤刚胡静云彭府华 Key Laboratory of Metallogenic Prediction of nonferrous Metals and geological Environment Monitoring(Central South University) Ministry of EducationChangsha 410083China Hunan Key Laboratory of nonferrous Resources and geological Hazard exploration Changsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Changsha Institute of Mining Research Co. Ltd.Changsha 410012China

微震监测技术能进行工程岩体失稳垮塌前兆特征的辨识和分析,对于地质灾害预警防控具有重要意义。本文基于已有室内岩石受压损伤破坏声发射实验规律,通过开展现场微震多参数定量分析,探究了柿竹园矿山6·21大爆破诱发山体滑移垮塌的前兆... 详细信息

微震监测技术能进行工程岩体失稳垮塌前兆特征的辨识和分析,对于地质灾害预警防控具有重要意义。本文基于已有室内岩石受压损伤破坏声发射实验规律,通过开展现场微震多参数定量分析,探究了柿竹园矿山6·21大爆破诱发山体滑移垮塌的前兆特征。大爆破诱发微震事件的b值和空间分形维数表现出下降趋势,b值急剧下降和分形维数降到最低可作为工程岩体失稳垮塌的前兆特征。此外,能量指数和累计视体积的变化可以分别表征应力和应变的变化。能量指数快速下降和累计视体积持续增加的组合特征反映了岩体的失稳状态。经过多个失稳破坏阶段后岩体发生最终的失稳垮塌。该案例表明微震监测能为工程岩体失稳垮塌的预警和防控提供重要信息,也为涉及爆破作业的诸多地质工程活动的安全监测提供了参考。

关键词：微震监测岩体垮塌前兆特征预警

Unveiling Tin Mineralization in the Baoshan, Southern Hunan Province: Implications for Coexisting Cu and Sn Polymetallic Composite Metallogenic Systems

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Journal of Earth Science 2024年第5期35卷 1781-1785页

作者： Qizhi Yang Tianyang Hu Youyue Lu Lei Liu Funian Huang Jianfeng Li Zunzun Zhang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Mineral Resource Investigation of Hunan Province Key Laboratory of Metallogenic Prediction of nonferrous Metals and geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South University Wuhan Centre of geological Survey China Geological Survey (Central South China Innovation Center for Geosciences) School of Geographical Sciences Liaoning Normal University

0 INTRODUCTION Southern Hunan Province(SHP), positioned at the convergence of the Qin-Hang zone and the Nanling belt, is distinguished by its extensive Mesozoic magmatic activities and contemporaneous polymetallic dep... 详细信息

关键词： Hunan metallic distinguished

Characteristics and Genesis of Fine-Clastic Rock-Type Au Deposits in the Liaodong Rift

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 570-576页

作者： YANG Dejiang liaoning nonferrous geological exploration bureau State Bureau of Nonferrous Matals IndustryShenyang 110000

Gold deposits occurring in the Liaodong rift are located in interlayered carbonate rocks and fine-clastic rocks, belonging to the middle and upper parts of the lower Proterozoic. Compared with the Carlin-type Au deposits abroad and gold deposits in Yunnan-Guizhou-Guangxi, Qinling and western Sichuan Province, they are similar in many respects. This paper discusses the geological features of ore-bearing formations and ore-filling structures and metallogenetic characteristics. Through the discussion on the sources of ores, heat and water, it points out that the Au deposits belong to vadose reworked hydrothermal deposits. This conforms to the principle of “mineralization in the neighbouring areas”, i.e., the deposits are formed in nearby ore-bearing layers, and the latest hydrothermal event was the main factor in forming the Au deposits.

关键词： Liaodong fine-clastic rock-type Au deposit vadose reworked hydrothermal deposit