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structural deformation, metallogenic epoch and genetic mechanism of the Woxi Au-Sb-W deposit, Western Hunan Province, South China

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Science China Earth Sciences 2022年第12期65卷 2358-2384页

作者： Bin LI Deru XU Daoyuan BAI Guoxiang CHI Junfeng DAI Cheng GAO Teng DENG Shaohao ZOU Wen MA Guojian WANG Yuexin LING Guangqian ZENG Yinmin LI State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China Hunan Institute of Geological Survey Changsha 410116China Department of Geology University of ReginaRegina S4S 0A2SaskatchewanCanada

The remobilization,migration,precipitation,and enrichment of ore-forming elements are closely related to structures.Therefore,detailed regional and ore-field structural analyses are critical for determining the genesis of a mineral deposit.The Jiangnan Orogenic Belt(JOB)is an important gold polymetallic metallogenic belt in South China,which is characterized by multiple periods of gold mineralization in the Paleozoic and Mesozoic.However,the genesis of these gold polymetallic deposits is still not well understood due to a lack of systematic research on the regional geology,ore-controlling structures and metallogenic mechanism.In this study,a detailed structural survey at the surface and in the subsurface tunnels was conducted on the Woxi Au-Sb-W deposit,the genesis of which is relatively controversial among the gold polymetallic deposits in the JOB due to poor structural constraints.In addition,a wolframite U-Pb dating was carried out to further constrain the relationship between structures and mineralization.Based on the results of these studies,together with those from previous studies,it is proposed that the Woxi deposit and surrounding areas likely underwent six periods of regional deformation,which are constrained in time and geodynamic setting.Furthermore,we present a systematic discussion on the roles of ore-controlling structures in the transportation,distribution,and deposition of ore-forming elements and localization of orebodies.According to the wolframite dating results,structural analyses,and previous data,we propose that the Woxi Au-Sb-W deposit was formed in two stages during the Yanshanian:a W(wolframite)-Au mineralization stage at ca.140 Ma and an Au-Sb-W(scheelite)mineralization stage at<130 Ma.These mineralizing events are interpreted to have a tight relationship with tectonic reactivation,and the ore-forming fluids were derived from deep sources,including those of magmatic or metamorphic origins.The Woxi deposit can therefore be classified as an“intracontinental reactivation-type”,and the mine

关键词： structural deformation Wolframite U-Pb age Metallogenic epoch Genetic mechanism Woxi Au-Sb-W deposit Western Hunan Province Jiangnan orogen

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structural deformation and fluid flow from East Sichuan to the northwestern periphery of the Xuefeng Uplift,China

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Petroleum Science 2012年第4期9卷 429-435页

作者： Tang Liangjie Cui Min State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Basin Research Center China University of PetroleumBeijing 102249China CNOOC Research Institute Beijing 100027China

Hydrocarbon preservation conditions have restricted exploration in the Middle and Upper Yangtze,and structural deformation and fluid activity have played an important role in the origin and preservation of oil and gas.In order to study that how the deformation and fluid activity impact the hydrocarbon preservation,we did some field work and collected some calcite vein samples for analysis of deformation periods using acoustic emission and fluid inclusions.Combined with previous studies,the strata distribution,tectonic deformation and fluid characteristics show that there are three structural belts in the study area：East Sichuan,West Hunan and Hubei and the northwestern periphery of the Xuefeng Uplift,and that their tectonic deformation style,fluid inclusion characteristics and hydrocarbon preservation are different.The breakthrough thrusts were well developed in the anticline core,and a lot of hydrocarbon inclusions were found in calcite veins around the thrusts in East Sichuan.The breakthrough thrusts were only in the syncline core in West Hunan and Hubei,and the brine inclusions did not contain hydrocarbon in calcite veins around the thrusts.Many breakthrough thrusts were found in the northwestern periphery of the Xuefeng Uplift,where there were only rare calcite veins.The deformation and hydrocarbon inclusion indicated that when there was no fault breakthrough in East Sichuan,the Paleozoic covered by the Triassic regional cap was good for hydrocarbon preservation.The strata above the Lower Paleozoic were denuded,and lots of brine inclusions and deep infiltration of surface water were found in the West Hunan and Hubei,so only the part of the syncline area with a well developed Silurian regional cap had good preservation conditions.Intense tectonic movements and denudation were widely developed in the northwestern periphery of the Xuefeng Uplift,where there were only paleo-reservoirs,non-hydrocarbon fluid activity and poor preservation conditions.

关键词： structural deformation fluid flow preservation conditions fluid inclusion Middle and Upper Yangtze

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Mechanical responses of underground carriageway structures due to construction of metro tunnels beneath the existing structure:A case study

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Deep Underground Science and Engineering 2024年第2期3卷 231-246页

作者： Xin Han Fei Ye Xingbo Han Chao Ren Jing Song Ruliang Zhao School of Highway Chang'an UniversityXi'anChina Shandong Province Transportation Planning and Design Institute JinanChina China Water Resources Beifang Investigation Design and Research Co.Ltd.TianjinChina

To understand the mechanical response pattern of the existing structure and ground due to the construction of metro tunnels underneath,the finite difference method is adopted to study the torsional deformation and stress variation of the existing structure and the effect of underground carriageway structures on the surface subsidence.The curves of the maximum differential subsidence,torsion angle,and distortion of the cross-section of the existing structure show two peaks in succession during traversing of two metro tunnels beneath it.The torsion angle of the existing structure changes when the two tunnels traverse beneath it in opposite directions.The first traversing of the shield tunnel mainly induces the magnitude variation in torsional deformation of the existing structure,but the second traversing of the subsurface tunnel may cause a dynamic change in the magnitude and form of torsional deformation in the existing structure.The shielding effect can reduce the surface subsidence caused by metro tunnel excavation to a certain extent,and the development trend of subsidence becomes slower as the excavation continues.

关键词： metro tunnel numerical simulation structural deformation surface subsidence underground carriageway structure

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Paleozoic structural deformation of Bachu Uplift,Tarim Basin of Northwest China:Implications for Plate Drifting

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Journal of China University of Geosciences 2009年第4期20卷 755-762页

作者：何光玉何治亮张洪安林璐陈强路钱一雄顾忆竺知新竺国强 Department of Earth Sciences Zhejiang University Exploration & Production Research Institute SINOPEC Northwestern Branch of Exploration and Production Research Institute Wuxi Research Institute of Petroleum and Experiment Geology Exploration & Production Research Institute

Based on high-resolution 2D seismic profiles, the Paleozoic structural deformation char- acteristics of Bachu （巴楚） uplift of northwestern Tarim basin, NW China, are exhibited in this article. The deformation happened during three main geological periods： the end of Middle-Late Ordovician （O2-3）, the end of Early-Middle Devonian （D1-2）, and the end of Late Permian （P2）. In the Bachu uplift, there developed a series of NW-trending thrust faults and imbricate structures due to the effect of the NW-SE compression stress towards the end of Middle-Late Ordovician （O2-3）（middle Caledonian movement）, and there developed some NNE-trending thrust faults and fault blocks under the control of the NEE-SWW compression stress at the end of Early-Middle Devonian （D1-2）（early Hercynian movement）. However, at the end of Late Permian （P2）（late Hercynian movement）, some NE-trending thrust faults and associated folds developed as a result of the NE-SW compression stress. The first-stage （O2-3） deformation is obviously more violent than those of the latter two stages （D1-2 and P2）, which implies that the Tarim plate drifted quickly to the north at around the same time basin.

关键词： structural deformation Paleozoic plate drift Bachu uplift Tarim.

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Late Mesozoic Tectonic Evolution of Southwestern Fujian Province,South China:Constraints from Magnetic Fabric,Zircon U-Pb Geochronology and structural deformation

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Journal of Earth Science 2018年第2期29卷 391-407页

作者： Sen Wang Da Zhang Ganguo Wu Xingjian Li Xiaoqiao Gao Absai Vatuva Yuan Yuan Tengda Yu Yu Bai Ye Fang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Beijing Institute of Exploration Engineering China Geological SurveyBeijing 100083China Inner Mongolia Mining Development Limited Liability Company Hohhot 010010China

A combined study of magnetic fabrics, zircon U-Pb geochronology and structural deformation was carried out for Late Paleozoic sedimentary and Mesozoic magmatic rocks in the southwestern Fujian rift basin, South China, aiming at deciphering the tectonic evolution during Late Mesozoic. Field observations showed that the Late Mesozoic structure deformations in southwestern Fujian were categorized into four phases： NW-SE compression, ENE-WSW extension, NNE-SSW compression and NNW-SSE extension, se- quentially. Zircons picked out from Juzhou granite and WNW-trending diabase dykes showed complete crys- tal shapes and clear oscillatory zonings on their edges, and the U-Pb dating yielded ages of 132 and 141 Ma, respectively. The susceptibility ellipsoid magnitude parameters of the Juzhou granite are characterized by flaser type strain ellipsoid, with pole density center of K3 falling into the first and the third quadrants, these fea- tures revealed that the Juzhou granite formed in ENE-WSW compressional stress field, indicating the early stage of Early Cretaceous extrusion in southwestern Fujian. The late stage of Early Cretaceous NNE-SSW ex- tension was limited by the widespread WNW-trending diabase dykes, which were usually regarded as impor- tant indications for a regional extensional setting. On the basic of the previous researches, structural deforma- tion studies, and the deductions above, it can be concluded that southwestern Fujian experienced five main tectonic stages during Late Mesozoic： Early Jurassic extension, Middie-Late Jurassic thrusting, early stage of Early Cretaceous extension, late stage of Early Cretaceous compression and Late Cretaceous extension.

关键词： tectonic evolution magnetic fabric U-Pb dating structural deformation southwestern Fujian.

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Geological structures and potential petroleum exploration areas in the southwestern Sichuan fold-thrust belt, SW China

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Petroleum Exploration and Development 2020年第4期47卷 699-713页

作者： CHEN Zhuxin WANG Lining YANG Guang ZHANG Benjian YING Danlin YUAN Baoguo PEI Senqi LI Wei Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Key Laboratory of Basin Structure&Hydrocarbon Accumulation CNPCBeijing 100083China Research Institute of Petroleum Exploration&Development PetroChina Southwest Oil&Gas Field CompanyChengdu 610041China Northwest of Sichuan Gas Production District PetroChina Southwest Oil&Gas Field CompanyJiangyou 621700China

Based on the latest geological,seismic,drilling and outcrop data,we studied the geological structure,tectonic evolution history and deformation process of the southwestern Sichuan fold-thrust belt to find out the potential hydrocarbon exploration areas in deep layers.During key tectonic periods,the southwestern Sichuan fold-thrust belt developed some characteristic strata and structural deformation features,including the Pre-Sinian multi-row N-S strike rifts,step-shaped platform-margin structures of Sinian Dengying Formation,the western paleo-uplift in the early stage of Late Paleozoic,the Late Paleozoic–Middle Triassic carbonate platform,foreland slope and forebulge during Late Triassic to Cretaceous,and Cenozoic multi-strike rejuvenated fold-thrusting structures.The fold-thrust belt vertically shows a double-layer structural deformation controlled by the salt layer in the Middle Triassic Leikoupo Formation and the base detachment layer at present.The upper deformation layer develops the NE-SW strike thrusts propagating toward basin in long distance,while the deeper deformation layer had near north-south strike basement-involved folds,which deformed the detachment and thrusting structures formed earlier in the upper layer,with the deformation strength high in south part and weak in north part.The southern part of the fold-thrust belt is characterized by basement-involved fold-thrusts formed late,while the central-northern part is dominated by thin-skin thrusts in the shallow layer.The Wuzhongshan anticlinal belt near piedmont is characterized by over-thrust structure above the salt detachment,where the upper over-thrusting nappe consists of a complicated fold core and front limb of a fault-bend fold,while the deep layer has stable subtle in-situ structures.Favorable exploration strata and areas have been identified both in the upper and deeper deformation layers separated by regional salt detachment,wherein multiple anticlinal structures are targets for exploration.Other potential exploration strata and areas in

关键词： eastern Tibet Plateau Sichuan Basin deep geological structure fold-thrust belt structural deformation petroleum exploration

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Residual Stress Relaxation of Thin‑walled Long Stringer Made of Aluminum Alloy 7050‑T7451 under Transportation Vibration

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Chinese Journal of Mechanical Engineering 2020年第3期33卷 150-159页

作者： Yinfei Yang Lu Jin Jixing Du Liang Li Wei Yang Nanjing University of Aeronautics and Astronautics Nanjing 210016China Shenyang Aircraft Corporation Shenyang 110034China.

Thin-walled long stringer made of aluminum alloy 7050-T7451 is prone to deformation during transportation,so a research of residual stress relaxation was launched in this paper.The transport resonance stress of long stringer was analyzed based on the power spectral density of road transport acceleration.The residual stress relaxation experiment of aluminum alloy 7050-T7451 under different equivalent stress levels was designed and carried out.According to the amount of residual stress relaxation in the experiment,an analytical model was established with the equivalent stress level coefficient.The deflection range of long stringer was evaluated under different damping ratios.The results show that when the equivalent stress exceeds 0.8σ0.2,the residual stress relaxation of the thin-walled samples occurs.The residual stress relaxation increases linearly with the equivalent stress,which is logarithmically related to the loading cycle.The deformation caused by residual stress relaxation of the long stringer is proportional to the square of the length and the bending moment caused by stress rebalance,and inversely proportional to the moment of inertia of the structure.As the damping ratio decreases from 0.03 to 0.01,the total deflection of the long stringer increases from 0 to above 1.55 mm.

关键词： Aluminum alloy 7050-T7451 Large thin-walled part Transportation process Residual stress structural deformation

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^(40)Ar/^(39)Ar Dating of deformation Events and Reconstruction of Exhumation of Ultrahigh-Pressure Metamorphic Rocks in Donghai, East China

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Acta Geologica Sinica(English Edition) 2003年第2期77卷 155-168页

作者： LI Jinyi, YANG Tiannan, CHEN Wen and ZHANG Sihong Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037E-mail: jyli@*** Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China

Recent investigations reveal that the ultrahigh-pressure metamorphic (UHPM) rocks in the Donghai region of East China underwent ductile and transitional ductile-brittle structural events during their exhumation. The earlier ductile deformation took place under the condition of amphibolite facies and the later transitional ductile-brittle deformation under the condition of greenschist facies. The hanging walls moved southeastward during both of these two events. The 40Ar/39Ar dating of muscovites from muscovite-plagioclase schists in the Haizhou phosphorous mine, which are structurally overlain by UHPM rocks, yields a plateau age of 218.0±2.9 Ma and isochron age of 219.8Ma, indicating that the earlier event of the ampibolite-facies deformation probably took place about 220 Ma ago. The 40Ar/39Ar dating of oriented amphiboles parallel to the movement direction of the hanging wall on a decollement plane yields a plateau age of 213.1±0.3 Ma and isochron age of 213.4±4.1 Ma, probably representing the age of the later event. The dating of pegmatitic biotites and K-feldspars near the decollement plane from the eastern Fangshan area yield plateau ages of 203.4±0.3 Ma, 203.6±0.4 Ma and 204.8±2.2 Ma, and isochron ages of 204.0±2.0 Ma, 200.6±3.1 Ma and 204.0±5.0 Ma, respectively, implying that the rocks in the studied area had not been cooled down to closing temperature of the dated biotites and K-feldspars until the beginning of the Jurassic (about 204 Ma). The integration of these data with previous chronological ages on the ultrahigh-pressure metamorphism lead to a new inference on the exhumation of the UHPM rocks. The UHPM rocks in the area were exhumed at the rate of 3-4 km/Ma from the mantle (about 80-100 km below the earth's surface at about 240 Ma) to the lower crust (at the depth of about 20-30km at 220 Ma), and at the rate of 1-2 km/Ma to the middle crust (at the depth of about 15 km at 213 Ma), and then at the rate of less than 1 km/Ma to the upper crust about 10 km deep at about 204 Ma.

关键词： ultrahigh-pressure metamorphic rocks structural deformation 40Ar/39Ar dating exhumation Donghai East China

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Late Cretaceous Transpressional Fault System: A Case Study of the Yishu Fault Belt, Shandong Province, Eastern China

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1531-1545页

作者： LI Chunlin WANG Zongxiu WU Qingzi LIU Yongqing GAO Wanli TAN Yuanlong KUANG Hongwei LI Huijun Key Laboratory of Shale Oil and Gas Geological Survey Institute of Geomechanics Chinese Academy of Geological Sciences Linshu Bureau of Land Resoures Institute of Geology Chinese Academy of Geological Sciences

On the basis of field observations of the structures of three profiles from the Linshu region, deformation characteristics and the tectonic background of the Yishu fault belt in the Late Cretaceous–Early Cenozoic have been discussed in detail.Three structural profiles, whose deformations consist mainly of earlier transpressional faults and later normal faults, were developed for the Mengtuan Formation of the Lower Cretaceous Dasheng Group.Typical positive flower structures, duplex structures, and break-through faults were found in these profiles.On the basis of analyses of the structural deformation and previous geochronological studies, it was concluded that the earlier transpressional faults of the profiles were triggered by the sinistral transpression of the Yishu fault belt in the Late Cretaceous–Early Paleogene, and that the later normal faults, formed during the Late Paleogene–Neogene extension, truncated the earlier transpressional faults.With consideration of the tectonic evolution of the Tan-Lu fault belt and the different drift directions of the Pacific plate since the Cretaceous, we suggest that the major tectonic events of the Late Cretaceous–Neogene in eastern China were mainly controlled by the subduction of the Pacific plate.

关键词： Late Cretaceous structural deformation transpressional fault Yishu fault belt Pacific plate

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Analysis on forming conditions of deep marine reservoirs and their concentration belts in superimposed basins in China

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Science Bulletin 2007年第S1期 12-27页

作者： ZHAO WenZhi, WANG ZeCheng, ZHANG ShuiChang & WANG HongJun Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

By taking the Tarim Basin, Sichuan Basin and Ordos Basin as examples, the conditions for deep marine reservoir formation were illustrated in three aspects listed below: late-stage superimposition style, burial history and structural deformation of the marine stratigraphic system. The burial history of marine source rocks can be divided into three types, i.e., type I, type II and type III, which are obviously different from the case with present hydrocarbon phases in terms of hydrocarbon generation and petroleum-reservoir formation. Based on evolution history, the structural belts in the marine stratigraphic sequence can also be divided into four types, i.e. earlier normal fault-later fault-fold type, earlier uplift-later fault-fold type, earlier uplift-later flattened slope type, and earlier depression-later thrust type. In this paper, a successive gas generation model was proposed, and it was particularly pointed out that coupling of geothermal field annealing evolution and tectonic subsidence and late gas generation from dispersed liquid hydrocarbon in highly matured to over-matured source rocks are key factors for formation of marine petroleum reservoirs. The geological conditions for formation of high-grade reservoirs in deep marine system, covering early hydrocarbon injection, deep denudation and buried dolomitization, were summarized. It was finally concluded that three major structural belts, i.e. paleo-uplift belt characterized by composite hydrocarbon accumulation, paleo-fault belt and high-energy sedimentary facies belt, were involved in marine hydrocarbon accumulation.

关键词： superposition basin marine formation deep zone dispersed liquid hydrocarbon geothermal field structural deformation

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