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Formation mechanism of breccia pipe type in Yixingzhai gold deposit

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Journal of Central South University of Technology 2008年第1期15卷 89-94页

作者：邵拥军张贻舟张建东丁宗炜陈星霖刘忠法 School of geoscience and environmental Engineering Central South University

Based on the basic geological features of Yixingzhai gold deposit, the geological features, classification and relation to mineralization of breccia pipes were discussed by surveying the xenoliths and breccia's mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation mechanism of the blasting breccia pipes were investigated. The main conclusion shows that Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped earlier, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage; Tietangdong and Nanmenshan breccia pipes that are shaped latter are the ultra-hypabyssal auriferous fluid production composed mainly of the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber, belonging to differentiation derivatives at different stages in the deep magmatic chamber.

关键词： formation mechanism Yixingzhai gold deposit auriferous quartz veins breccia pipes

Bifurcation analysis and control of periodic solutions changing into invariant tori in Langford system

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Chinese Physics B 2008年第5期17卷 1691-1697页

作者：刘素华唐驾时秦金旗尹小波 College of Mechanics and Aerospace Hunan University Anyang institute of Technology School of geoscience and environmental Engineering Central South University

Bifurcation characteristics of the Langford system in a general form are systematically analysed, and nonlinear controls of periodic solutions changing into invariant tori in this system are achieved. Analytical relationship between control gain and bifurcation parameter is obtained. Bifurcation diagrams are drawn, showing the results of control for secondary Hopf bifurcation and sequences of bifurcations route to chaos. Numerical simulations of quasi-periodic tori validate analytic predictions.

关键词： Langford system nonlinear control secondary Hopf bifurcation torus

Mapping of Landslides and Other Catastrophic Processes in the Area of the Beichuan City(Sichuan Province,China) after the Earthquake of May 12~th 2008

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地学前缘 2009年第S1期16卷 72-73页

作者： Alexey Petrasov Sergeev institute of environmental geoscience Russian Academy of Sciences

The Wenchuan earthquake of 2008 in the Sichuan Province(China)is one of the most destructive earthquakes in recent *** killed about 89 thousand people and caused considerable economic *** the first phase of research the main objective was in detailed image interpretation and mapping of the territory of a key site around Beichuan City,at the initial stage of adaptation of the natural-technical environment after the catastrophic *** this purpose we used

关键词： landslides Beichuan dammed lake geomorphological mapping

Rock-forming mechanism of Fenghuangshan rockbody in Tongling area

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Journal of Central South University of Technology 2003年第3期10卷 216-221页

作者：邵拥军彭省临吴淦国刘亮明赖健清张达 geoscience and Resource College China University of Geoscience. Beijing 100083 China School of geoscience and environmental Engineering Central South University Changsha 410083 China geoscience and Resource College China University of Geoscience Beijing 100083 China

Based on the detailed geological investigation and record of galleries and drill holes, a new idea has been advanced that granodiorite is earlier than quartz monzodiorite porphyry. Both of them are products of two different magmatic intrusive activities. The analysis results of trace elements show that the Sr content is beyond any other crustal rock and the Th content is beyond that of Ta. The whole-rock analysis indicates that rockbody is rich in CaO and poor in K2O. In the composition of Pb istope of rockbody, the ratio of 207 Pb to 204Pb is less than 15. 60. All these show that the magma mainly comes from the upper mantle. Ti,Zr,Cr,Nb trace elements and the relation between the Gardini index(τ) and the Rittmann index(σ) indicate that the rockbodies are formed in the orogenic belt and island arc tectonic setting. The summation (2REE) and the characteristic value(m( La)/m( Yb)) of the rare earth elements show that the original rock is alkalic basalt. The analysis of the characteristic values of REE and the quantitative modeling calculation indicate that the rock-forming process is dominated by mixed crystallization. According to the analysis on the rock-forming order, magmatic source, tectonic setting and rock-forming process, combined with the achievements of regional rock-controlling structures and division of sublayer of crust, it is believed that Fenghuangshan rock body derives from the deep-seated alkalic basalt magma. The rock-forming process has undertaken sialic and calcareous assimilation and contamination of two different degrees. The rock-forming model belongs to the typical assimilation and fractional cryatalization mechanism.

关键词： complex rockbody upper mantle erogenic belt island arc alkalic basalt assimilation and fractional crytalization mechanism

Forming mechanism of hydrocarbon reservoirs in Yingshan Formation of Yuqi block in Akekule arch,Tarim Basin

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Journal of Central South University of Technology 2008年第2期15卷 244-250页

作者：旷理雄郭建华黄太柱 School of geoscience and environmental Engineering Central South University institute of Petroleum Exploration and Development of SINOPEC Northwest Branch Company

The reservoir conditions,oil and gas charge history and accumulation phases were studied for Yingshan Formation of Yuqi block,and an oil and gas accumulation model was established by using the techniques of reservoir prediction,fluorescence thin section and fluid inclusion analysis under the guidance of the theories of oil and gas *** results indicate that the main rock types in Yingshan Formation are micrite and *** carbonate reservoirs are of cave,fracture-pore and fracture types,and their physical properties are intermediate;there are at least four oil/gas charges,*** Hercynian,Yanshanian,early Himalayan and middle Himalayan(Cenozoic).The most important charge periods are late Hercynian,early Himalayan and middle Himalayan;the oil and gas accumulation model is self source-lateral expulsion of hydrocarbon-multistage accumulation,or hydrocarbon sourced from and preserved in the same old rocks-long term expulsion of hydrocarbon-multistage accumulation.

关键词： reservoir oil and gas charge accumulation model Yingshan Formation Akekule arch northern Tarim Basin

The Effect of Grain Size on the Viscosity and Yield Stress of Fine-Grained Sediments

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Journal of Mountain Science 2014年第1期11卷 31-40页

作者： Sueng Won JEONG Korea institute of geoscience and Mineral Resources

In debris flow modelling,the viscosity and yield stress of fine-grained sediments should be determined in order to better characterize sediment *** particular,it is important to understand the effect of grain size on the rheology of fine-grained sediments associated with *** looking at the relationship between shear stress and shear rate before yielding,a high-viscosity zone(called pseudoNewtonian viscosity) towards the apparent yield stress *** yielding,plastic viscosity(called Bingham viscosity) governs the *** examine the effect of grain size on the rheological characteristics of fine-grained sediments,clay-rich materials(from the Adriatic Sea,Italy; Cambridge Fjord,Canada; and the Mediterranean Sea,Spain),silt-rich debris flow materials(from La Valette,France) and silt-rich materials(iron tailings from Canada) were *** characteristics were examined using a modified Bingham *** materials examined,including the Canadian inorganic and sensitive clays,exhibit typical shear thinning behavior and strong *** the relationships between the liquidity index and rheological values(viscosity and apparent yield stress),the effect of grain size on viscosity and yield stress is significant at a given liquidity *** viscosity and yield stress of debris flow materials are higher than those of low-activity clays at the same liquid *** the viscosity and yield stress of the tailings,which are mainly composed of silt-sized particles,are slightly lower than those of low-activity clays.

关键词： Debris Flow Viscosity Yield Stress Grain Size Fine-Grained Sediments

The starting mechanism and movement process of the coseismic rockslide: A case study of the Laoyingyan rockslide induced by the “5.12” Wenchuan earthquake

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Journal of Mountain Science 2020年第5期17卷 1188-1205页

作者： LIU Bo HU Xie-wen HE Kun HE Shu-heng SHI Hong-bin LIU Ding-yi Faculty of geoscience and environmental engineering Southwest Jiaotong UniversityChengdu 611756China

The"5.12"Wenchuan earthquake in 2008 triggered a large number of co-seismic *** rear boundary or cracks of co-seismic landslide are generally located at the steep free surface of thin or thick *** process of this kind of landslides could be divided into two parts:the seismic dynamic response of the slope and the movement process of rock *** the Laoyingyan rockslide as an example,the amplification effect was studied by single-degree-of-freedom system analysis ***,the dynamic process of landslide under seismic loading was simulated by the finite difference method(FDM)and discrete element method(DEM).The amplification coefficient of the rockslide to seismic wave is *** results show that the critical sliding surface of the Laoyingyan rockslide was formed at the 23 th seconds under the action of seismic *** the same time,tension failure occurred at the rear edge of the sliding mass and shear failure occurred at the front *** maximum displacement was 0.81 m and the initial velocity was 2.78 m/*** the initiation process of the rockslide,the rock mass firstly broke down along the joints which are along the dip of the rock stratum,and then collapsed bodily along the secondary structural *** the process of movement,the maximum velocity of rock mass was 38.24 m/*** that,the rock mass underwent multiple collisions,including contact,deceleration to 0 and speed recovery after ***,due to the constant loss of energy,the rocks stopped and accumulated loosely at the foot of the *** longest distance of movement was about 494 ***,the smaller the damping ratio,the farther the rock mass *** with the results without considering the amplification factor,the movement distance of landslide by considering the amplification factor was more *** study of the Laoyingyan rockslide is helpful to strengthen our field identification of potential co-seismic *** the same time,u

关键词： Co-seismic rockslide Seismic wave Amplification coefficient Finite difference method Discrete element method Landslide

Key strategies for predictive exploration in mature environment: model innovation, exploration technology optimization and information integration

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Journal of Central South University of Technology 2005年第2期12卷 186-191页

作者：刘亮明彭省临 School of geoscience and environmental Engineering Central South University Changsha 410083 China

Prediction has become more and more difficult in mineral exploration, especially in the mature exploration environment such as Tongling copper district. For enhancing predictive discovery of hidden ore deposits in such mature environment, the key strategies which should be adopted include the innovation of the exploration models, application of the advanced exploration techniques and integration of multiple sets of information. The innovation of the exploration models should incorporate the new metallogenic concepts that are based on the geodynamic anatomization. The advanced techniques applied in the mature exploration environment should aim at the speciality and complexity of the geological setting and working environments. The information synthesis is to integrate multiple sets of data for giving a more credible and visual prospectivity map by using the geographic imformation system(GIS) and several mathematical methods, such as weight of evidence and fuzzy logic, which can extract useful information from every set of data as much as possible. Guided by these strategies, a predictive exploration in Fenghuangshan ore field of Tongling copper district was implemented, and a hidden ore deposit was discovered.

关键词： exploration strategy predictive exploration exploration model exploration technique information (integration ) Tongling

Control of relay structure on mineralization of sedimentary-exhalative ore deposit in growth faults of graben systems

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Journal of Central South University of Technology 2005年第3期12卷 340-345页

作者：奚小双汤静如孔华何绍勋 School of geoscience and environmental Engineering Central South UniversityChangsha 410083China

Based on the study of ore deposits and orebody structures of two sedimentary-exhalative ore deposits, i.e., Changba and Xitieshan Ore Deposits, it is found that the structural patterns of metallogenic basin of seafloor exhalative sulfide deposits in the ancient graben systems are controlled by relay structures in normal faults. The shapes of metallogenic basins are composed of tilting ramp, fault-tip ramp and relay ramp, which dominate migration of gravity current of ore-hosted fluid and shape of orebody sedimentary fan in the ramp. By measuring and comparing the difference of length-to-thickness ratios of orebody sedimentary fan, the result shows that the occurrence of the ramp has a remarkable impact on the shape of orebody.

关键词： exhalative ore deposits growth fault in graben systems relay ramp in normal faults metallegenesis of basins