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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

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

The construction of shale rock physics model and brittleness prediction for high-porosity shale gas-bearing reservoir

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Petroleum Science 2020年第3期17卷 658-670页

作者： Xin-Peng Pan Guang-Zhi Zhang Jiao-Jiao Chen school of geoscience and Info-Physics Central South UniversityChangsha 410082HunanChina school of geoscience China University of Petroleum(East China)Qingdao 266580ShandongChina

Due to the huge differences between the unconventional shale and conventional sand reservoirs in many aspects such as the types and the characteristics of minerals,matrix pores and fluids,the construction of shale rock physics model is significant for the exploration and development of shale *** make a better characterization of shale gas-bearing reservoirs,we first propose a new but more suitable rock physics model to characterize the *** then use a well A to demonstrate the feasibility and reliability of the proposed rock physics model of shale gas-bearing ***,we propose a new brittleness indicator for the high-porosity and organic-rich shale gas-bearing *** on the parameter analysis using the constructed rock physics model,we finally compare the new brittleness indicator with the commonly used Young’s modulus in the content of quartz and organic matter,the matrix porosity,and the types of filled *** also propose a new shale brittleness index by integrating the proposed new brittleness indicator and the Poisson’s *** on real data sets demonstrate that the new brittleness indicator and index are more sensitive than the commonly used Young’s modulus and brittleness index for the high-porosity and high-brittleness shale gas-bearing reservoirs.

关键词： Shale gas Rock physics model Brittleness prediction

Electron Magnetohydrodynamics Magnetic Reconnection Experiment on Keda Linear Magnetized Plasma Device

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Chinese Physics Letters 2019年第1期36卷 40-43页

作者： Feibin Fan Jinlin Xie Qiaofeng Zhang Longlong Sang Weixing Ding CAS Key Laboratory of geoscience Environment School of Earth and Space Sciences University of Science and Technology of China CAS Key Laboratory of geoscience Environment School of Physics University of Science and Technology of China

We conduct an electron magnetohydrodynamics magnetic reconnection experiment with guide-field in our Keda linear magnetized plasma device, in which two pulsed currents with the same direction are conducted in parallel with the axial direction of the main chamber of the device using two long aluminum sticks. After approximately 5μs, an X-type magnetic field line topology is formed at the center of the chamber. With the formation of the X-type topology of magnetic field lines, we can also find the rapid increase of the current and ratio of the common flux to the private flux in this area. Additionally, a reduction in the plasma density and the plasma density concentration along one pair of separatrices can also be found.

关键词： Electron magnetohydrodynamics Magnetic Reconnection Experiment Keda Linear Magnetized Plasma Device

Characteristics, Genesis, and Sedimentary Environment of Duplex-Like Structures in the Jurassic Sediments of Western Qaidam Basin, China

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Journal of Earth Science 2015年第5期26卷 677-689页

作者： Liangtian Ni Jianhua Zhong Zhufu Shao Yong Li Cui Mao Shengxin Liu school of geoscience China University of Petroleum Qingdao Institute of Marine Geology

A particular type of soft-sediment deformation structure, similar to imbricate structure, is developed in the Jurassic strata at Honggouzi, western Qaidam Basin, China. We refer to this structure as a duplex-like deformation structure, because it is inferred to have been formed by the action of fast-moving, submarine gravity current sediments gliding across a pre-existing semiconsolidated sedimentary layer. The layers of duplex-like structure crop out in the southeastern limb of the core of a medium-sized anticline. The average dip direction of the duplex-like structure is 301.2° and the average dip angle is 54.7°. Duplex-like deformed laminations are composed mainly of weakly metamorphosed, extremely poorly sorted, feldspathic lithic graywacke. Sericite can be observed along bedding planes. The duplex-like structure occurs within a sequence of river-channel fine conglomerate, interchannel carbonaceous mudstone（shale）, shallow-water delta sand-shale, shallow-lake calcareous mudstone, olistostromes, and a turbidite. At the bottom of the sequence, we found brownish-red shallow-lake calcareous mudstone and carbonaceous mudstone and at the top olistostromes whose genesis is related to the slip and drag of a slumped body of submarine sediment. In combination with other symbiotic and associated structures, it is considered that the duplex-like structure was formed by the slumping and subsequent movement and traction of delta-front semiconsolidated sediments over the bottom sediments of a shore or shallow-lake sedimentary environment, probably triggered by an earthquake. The attitude of the duplex-like structure indicates that the direction of gliding was from NW301.2° toward SE121°, which is consistent with the current location of the Altun Mountains, indicating that the Altun Mountains existed in the Jurassic. The orogenesis of these mountains likely involved seismic activity, and an earthquake was the triggering factor in the formation of the duplex-like structure by ca

关键词： duplex-like structure soft-sediment deformation turbidity current slumping and glid-ing western Qaidam Basin

Geochemical characteristics of the coal gangues from the Du'erping coal mine, Xishan coalfield, North China

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Chinese Journal Of Geochemistry 2013年第2期32卷 227-234页

作者： WEN Xueqin ZENG Fangui ZHANG Hong Department of geoscience and Technology School of Mining Technology Taiyuan University of Technology

Inductively coupled plasma mass spectrometry, inductively coupled plasma optical emission spectroscopy, hydride generation-atomic fluorescence spectrometry, emission spectrometry, X fluorescence spectrometry, and X-ray diffraction were employed to study the geochemistry and mineralogy of coal gangues from Nos. 2, 3, and 8 coal seams of the Du'erping coal mine, Xishan coalfield, Taiyuan, Shanxi Province. The study revealed that compared with the sedimentary cover, upper continent crust, Carboniferous-Permian coal from North China, as well as most coal in China, coal gangues from Nos. 2 and 3 coal seams are rich in Li, Be, Sc, Cr, Cu, Ga, Ba, Th, Nb, Cd, Pb, Ta and rare-earth elements, and coal gangues from No. 8 coal seam are rich in Li, Sc, V, Cr, Ga, U, and rare-earth elements. Compared with the Carboniferous-Permian coal from North China and most coal in China, coal gangues from Nos. 2, 3 and 8 seams are rich in Rb, V, Cs and Sr. Therefore, The Du'erping coal gangues in the Xishan coalfield are rich in most hazardous trace elements and rare-earth elements, wherein the contents of Ga and Li reach the industrial grade and have significance for industrial utilization. On the whole, coal gangues of the Shanxi Formation from the Permian are rich in more trace elements than those of the Carboniferous Taiyuan Formation. The distributions of REE show obviously dipping rightwards with negative Eu anomalies. The contents of rare-earth elements in the three seams are quite different. All of the above indicate that the source of the rare-earth elements is terrigenous debris. Minerals in No. 2 seam identified by X-ray diffraction mainly include quartz, kaolinite, in addition to calcite, pyrite, apatite, epidote, and epsomite. No. 3 seam mainly contains quartz, kaolinite, in addition to a small amount of sodium feldspar, calcium nitrate, iron ore, gypsum, and vivianite. No. 8 seam mainly contains kaolinite, dickite, quartz, illite, and a small amount of hematite and U. The corr

关键词：地球化学特征中国北方西山煤田煤矸石电感耦合等离子体质谱煤矿稀土元素原子荧光光谱

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

A Study of the Extratropical Transformation of Typhoon Winnie (1997)

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Advances in Atmospheric Sciences 2005年第5期22卷 730-740页

作者：朱佩君郑永光张春喜陶祖钰 Department of geoscience Zhejiang University Department of Atmospheric Sciences School of Physics Peking University

The complicated evolutive process of how a tropical cyclone transforms into an extratropical cyclone is still an unresolved issue to date, especially one which arises in a weakly baroclinic environment. Typhoon Winnie （1997） is studied during its extratropical transformation stage of extratropical transition （ET） with observational data and numerical simulations. Results show that Winnie experienced its extratropical transformation to the south of the subtropical high without intrusion of the mid-latitude baroclinic zone. This is significantly different from previous studies. Analyses reveal that the cold air, which appeared in the north edge of Winnie circulation, resulted from the precipitation drag and cooling effect of latent heat absorption associated with the intense precipitation there. The cooling only happened below 3 km and the greatest cooling was below 1 km. With the cold air and its advection by the circulation of Winnie, a front was formed in the lower troposphere. The front above is related not only to the cooling in the lower level but also to the warming effect of latent heat release in the middle-upper levels. The different temperature variation in the vertical caused the temperature gradient over Winnie and resulted in the baroclinicity.

关键词： extratropical transformation typhoon latent heat front

The Extremely Hot and Dry Climatic Events and Potash Enrichment in Salt Lakes of the Jiangling Depression, Jianghan Basin

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 769-770页

作者： WANG Chunlian LIU Chenglin YU Xiaocan LI Haonan LIU Jinlei MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China State Key Laboratory of Geological Processes and Mineral Resources School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China geoscience school of yangteze university Wuhan 430100 Hubei China

Objective A total of 820 million tons of potash reserves are predicted to exist in the Palaeocene-Eocene of the Jianghan Basin. However, the basin history is still unclear concerning the potash enriching conditions and mechanism. The Well SKDI is the first exploration well drilled in the Paleogene of Jianghan Basin with continuous coring, which was implemented in the south-central Jiangling Basin in 2013. It is essential to study the Palaeocene-Eocene paleoclimate, to further constrain the extreme draught events and the potash forming conditions.

关键词： The Extremely Hot and Dry Climatic Events and Potash Enrichment in Salt Lakes of the Jiangling Depression Jianghan Basin