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An accurately delineated Permian-Triassic Boundary in continental successions

Science china Earth Sciences 2007年第9期50卷 1281-1292页

作者： YIN HongFu1, YANG FengQing2, YU JianXin2, PENG YuanQiao1, WANG ShangYan3.& ZHANG SuXin1 1 Laboratory of Biological and Environmental Geology, china university of geosciences, wuhan 43.074, china 2 {3. key Laboratory of geological Process and mineral resources, china university of geosciences, wuhan 43.074, china 3.geological Survey of Guizhou Province, Guiyang 550011, china Laboratory of Biological and Environmental Geology China University of Geosciences Wuhan 430074 China state key Laboratory of geological Process and {3. resources China University of Geosciences Wuhan 430074 China geological Survey of Guizhou Province Guiyang 550011 China

The Permian-Triassic Boundary Stratigraphic Set (PTBST), characteristic of the GSSP section of Meishan and widespread in marine Permian-Triassic Boundary (PTB) sequences of South china, is used to trace and recognize the PTB in a continental sequence at Chahe (Beds 66f―68c). Diversified Permian plant fossils extended to the PTBST, and a few relicts survived above that level. Sporomorphs are dominated by fern spores of Permian nature below the PTBST, above which they are replaced by gymnosperm pollen of Triassic aspect. In the nearby Zhejue Section, the continental PTBST is charac- terized by the fungal 'spike' recorded in many places throughout the world. The boundary claybeds (66f and 68a,c) of the PTBST are composed of mixed illite-montmorillonite layers analogous with those at Meishan. They contain volcanogenic minerals such as β quartz and zircon. U/Pb dating of the upper claybed gives ages of 247.5 and 252.6 Ma for Beds 68a and 68c respectively, averaging 250 Ma. In con- trast to the situation in Xinjiang and South Africa, the sediment sequence of the Permian-Triassic tran- sition in the Chahe section (Beds 56―80) become finer upward. Shallowing and coarsening upward is not, therefore, characteristic of the Permian-Triassic transition everywhere. The occurrence of relicts of the Gigantopteris Flora in the Kayitou Fm. indicates that, unlike most marine biota, relicts of this pa- leophytic flora survived into the earliest Triassic. It is concluded that Bed 67 at Chahe corresponds to Bed 27 at Meishan, and that the PTB should be put within the 60-cm-thick Bed 67b④, now put at its base tentatively. This is the most accurate correlation of the PTB in continental facies with that in the marine GSSP.

关键词： Permian-Triassic Boundary, terrestrial sequence, U-Pb age, Chahe section, accuracy

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Micro-and submicrostructural evidence for high-temperature brittle-ductile transition deformation of hornblende: Case study of high-grade mylonites from Diancangshan, western Yunnan

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Science china Earth Sciences 2007年第10期50卷 1459-1470页

作者： CAO ShuYun, LIU JunLai? & HU Ling state key Laboratory of geological {3. and mineral resources (GPMR), china university of geosciences, Beijing 100083. china key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of Geo- sciences, Beijing 100083. china state key Laboratory of geological {3. and mineral resources (GPMR) China University of Geosciences Beijing 100083 China key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing 100083 China

OM (optical microscope)/TEM (transmission electron microscope) micro- and submicrostructural analysis of hornblende rocks sheared at high temperatures from the Diancangshan area, western Yunnan reveals evidence for deformation in the brittle-ductile transition of hornblende at middle crustal level (about 63.℃ and 0.653.GPa) and mechanisms of deformation in the transitional regime are further discussed. Sheared hornblende rocks at middle crustal level have typical mylonitic microstructures, shown by coarse porphyroclasts and fine matrix grains. Different mineral phases in the rocks show distinct deformation characteristics. Hornblende and feldspar grains are intensely deformed with ob- vious grainsize reduction, but quartz grains are recrystallized dominantly by grain growth. Hornblende grains show typical brittle-ductile transition nature. Initial crystallographic orientations of porphyro- clasts have strong effects on the behavior of grains during deformation. There are mainly two types of porphyroclasts, type I "hard" porphyroclasts and type II "soft" porphyroclasts, with [001] perpendicular and parallel to external shear stresses respectively. "Hard" porphyroclasts generally occur as compe- tent grains that are rarely deformed or sometimes deformed by fracturing and dislocation tangling. "Soft" porphyroclasts are highly deformed primarily by dislocation tangling (as shown in the cores of the porphyroclasts), but twinning, dislocation glide and climb probably due to hydrolytic weakening also contribute to dynamic recrystallization of the porphyroclasts into fine grains in the matrix. The micro- and submicrostructures of the two types of porphyroclasts and fine-grained matrix provide powerful evidence for the behavior of brittle-ductile transition of hornblende grains. It is concluded that twinning nucleation is one of the most important processes that operate during dynamic recrystalliza- tion of hornblende crystals at the brittle-ductile transition. (100) [001] t

关键词： hornblende, brittle-ductile transition, micro-and submicrostructures, twinning nucleation recrystallization, Diancangshan

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Discovery and analysis of ultra-micro grinding grain texture in slipping lamellae of ductile-brittle zone

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Science china Earth Sciences 2004年第3期47卷 265-271页

作者： GE Heping1, SUN Yan1, LU Xiancai1, ZHU Wenbin1, GUO Jichun1, LIU Deliang2 & Chi-yuen Wang3.1. Department of Earth Sciences, Nanjing university, state key Laboratory of {3. Deposit, Nanjing 210093. china 2. Department of Earth and Space Sciences, university of Science and Technology of china, Hefei 23.026, china 3. Department of Geology and Geophysics, university of California, Berkeley, CA 94720, USA Department of Earth Sciences Nanjing University State Key Lab. of Mineral Deposit Nanjing 210093 China Dept. of Earth and Space Sciences Univ. of Science/Technology of China Hefei 230026 China Department of Geology and Geophysics University of California Berkeley CA 94720 United States

Based on the observation of the deep bore cores sampled from the state of Cali-fornia, USA, preferred arranged particulate concentration belts were found in the ultra-slipping lamellae. And the same phenomenon was found again later in the bore cores from the petroleum basin in the Northern Shaanxi Province. It may be the product of the dynamic processes involv-ing tumbling, grinding and compresso-shearing functions, so the spherical particulates with ul-tra-size of nm and mm are called grinding grain. The formation of the grinding grains is related with the ductile-brittle deformation, the lateral pressure of the slipping, and the very low grade of dynamic metamorphism of the rocks. Based on the systematic analysis, it is indicated that some elements like Nb and Ta are enriched in the grinding grains in the granitic rocks because of the chemical differentiation, and that the slipping lamellae bearing grinding grains in mudstone with smear efficiency prove a perfect seal for oil and gas reservoirs. Meanwhile, the paper provides bases for the studies on the fast stick-slip movement and shear paradigm.

关键词： slipping lamellae, grinding grain texture, ductile-brittle deformation, smear efficiency.

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Statistical Prediction of Endogenetic Gold Deposit in East Junggar,Xinjiang

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Journal of Earth Science 1995年第2期14卷 84-91页

作者： Hu Wangliang Lu RuiyingDepartment of Mathematical Geology , china university of geosciences , Beijing 100083.Gao Huaizhong Zhang WangshengInstitute of Geology and mineral resources of Xinjiang , china university of geosciences , wuhan 43.074

The system of mineral deposit statistical prediction methods , based on the similarity - analogy theory , searching anomaly theory and the theory of ore - controlling by quantitative assemblage of metallotects , can be summarized into the following aspects : (1) concluding main ore - controlling conditions and ore - hunting indicators from typical deposits; (2)establishing geological concept model of deposits ; (3.selecting geological variable and dividing study units and granting specific value for each variable; (4) by the use of geological and mathematical geology method , building predication model , delineating prospective area for exploration and estimating the total resources; (5) evaluating the prospecting work . It is good practice to use this system for metallogenic prognosis and regional prospecting of gold deposit in East Junggar , Xinjiang and has achieved great success . As a result , we discovered the Kubusu gold mineralized belt . delineated prospective area - estimated total resources of gold in the belt and found out Kubusu gold deposit .

关键词： gold deposit metallogenic prognosis mathematical geology East Junggar ,Xinjiang .

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Multiphase tectonic movements, cap formations and evolution of the Majiang paleo-reservoir

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Petroleum Science 2011年第2期8卷 127-133页

作者： Tang Liangjie Cui Min state key Laboratory of Petroleum resources and Prospecting China University of Petroleum Beijing 102249 China CNOOC Research Institute Beijing 100027 China

The Majiang paleo-reservoir is a typical destroyed hydrocarbon reservoir, buried in carbonate strata of china＇s southern marine-facies. Field geological explorations, interpretations of seismic profiles and balanced cross-section restorations around this paleo-reservoir reveal that its formation and evolution have been restricted by multiphase tectonic movements of different intensities. A regional tectonic mechanism and model have been suggested for the formation and evolution of the Majiang paleo- reservoir. geological field exploration has been carried out along three typical Silurian cross-sections and rock samples were tested in combination with water-rock interaction. Based on the result of cap tests, the planar distribution, the residual thickness, the erosion thickness and the preservation conditions, the Silurian mudstone cap is discussed around the Majiang paleo-reservoir. Combining the hydrodynamic conditions of its formation and evolution and its tectonic movements, we determined the fact that the thicker the cap is, the more resistant it is to hydrodynamic destruction. The multi-phase formation and destructive geological model of the paleo-reservoir is established through an overall analysis of multi- phase tectonic evolutions, cap developments, hydrodynamic conditions and solid mineral metallogenic ages measured by Rb-Sr, Pb and Sm-Nd isotope techniques.

关键词： Multiphase tectonic evolution key tectonic changes cap evolution hydrocarbonpreservation Majiang paleo-reservoir

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Process of the Mesozoic post-collisional to postorogenic magmatic activity in the costal area of the Yangtze River in Anhui Province: evidence from igneous suites and xenoliths

Process of the Mesozoic post-collisional to postorogenic mag...

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International Conference on Continental Volcanism

作者： Yang-Song Du. Ya-Er Lou state key Laboratory of geological {3. and mineral resources china university of geosciences Beijing 100083.china

＜正＞The costal area of the Yangtze River in Anhui Province situated in the middle segment of the Yangtze River Deep Fault Belt is structurally located in the foreland of the Dabie Orogenic Belt. In this area are widely exposed a set of post-collisional to postorogenic associations formed in the Late Jurassic to Early Cretaceous. A geological, petrological, mineralogical and geochemical study has been carried out on the igneous suites and xenoliths, and provides some evidence for the process of the Mesozoic

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Support Vector Machine:A Novel Tool for mineral Prospectivity Mapping

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地学前缘 2009年第S1期16卷 289-289页

作者： Renguang Zuo~1,Gang Chen~2 1.state key Laboratory of geological {3. and mineral resources,china university of geosciences,wuhan 43.074,china. 2.Faculty of Information Engineering,china university of geosciences(wuhan),wuhan 43.074,china

Support Vector Machine(SVM) was demonstrated as a potentially useful tool to integrate multi-variables and to produce a predictive map for mineral deposits. The e 1071,a free R package,was used to construct a SVM with radial kernel function to integrate four evidence layers and to map prospectivity for Gangdese porphyry copper *** results demonstrate that the predicted prospective target area for Cu occupies 20.5%of the total study area and contains 52.4%of the total number of known porphyry copper *** results obtained

关键词： Support Vector Machine kernel function prospectivity Neural Network Tibet

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Tectono-chronologic constraints on a Mesozoic slip and thrust belt in the eastern Jiaodong Peninsula

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Science china Earth Sciences 2007年第1期50卷 25-32页

作者： ZHANG HongYuan1,2, HOU QuanLin3.& CAO DaiYong 4 1 Institute of Geology, Chinese Academy of geological Sciences, Beijing 10003., china 2 state {3. Laboratory of geological processes and mineral resources, china university of geosciences, Beijing 100083. china 3.Graduate School of china Acacemy of Sciences, Beijing 10003., china 4 {3. Laboratory of Coal resources (CUMT), Ministry of Education, Beijing 100083. china Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China state key Laboratory of geological {3. and mineral resources China University of Geosciences Beijing 100083 China Graduate School of china Acacemy of Sciences Beijing 100039 China key Laboratory of Coal resources (CUMT) Ministry of Education Beijing 100083 China

A major slip and thrust belt within the eastern Jiaodong Peninsula is located at the eastern terminal of the Qinling-Dabie-Sulu orogenic belt between the Sino-Korea Block and Yangtze Block. Although a lot of isotope chronologic data have been obtained regionally, little structural chronological research has been conducted in this region and this paper corrects that. Syn-deformational minerals were system-atically selected from samples of the NE-ENE trending transpressional shear zones and transpres-sional nappes and carefully analysed using 40Ar/3.Ar methods. Two tectonic events were defined with the first event resulting from early movement of transpressional nappes around 190 Ma ago. This ac-cords with the period of syn-orogenic sinistral slip of the Tan-Lu faults and clockwise shear in the Eastern Qinling-Tongbaishan part of the Qinling-Dabie-Sulu orogenic belt. The second event involved strikeslip thrust movement of deep shear zones between 13.Ma and 120Ma. This resulted from the onset of Mesozoic tectonic conversion in the eastern Jiaodong Peninsula. The sinistral strikeslip-thrusting in Jiaodong Peninsula and the extensional tectonism (toward ESE) in Liaodong Peninsula probably resulted in the clockwise rotation of Korea Peninsula in late Mesozoic.

关键词： the eastern Jiaodong Peninsula tectono-chronology 40Ar/3.Ar strikeslip and thrust belt.

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Kinetics and Dissolution Mechanisms of Oolitic Limestone Under Burial Condition

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地学前缘 2009年第S1期16卷 137-137页

作者： Kangjun Huang,Zhengyu Bao,Tianfu Zhang 1.Graduate School,china university of geosciences(wuhan),wuhan 43.074,{3.. 2.state key Laboratory of geological processes and mineral resources,china university of geosciences,wuhan 43.074,{3.

In order to study the control factors and mechanism of oolitic limestone reservoir being corroded by organic acid produced in burial stage,the reactions of acetic acid(pH=3. with oolitic limestone were investigated using the rotating-disk Corrosion Reactor System(CRS).The effects of disk rotational speed, temperature and system pressure were examined. Scanning Electron Microscope attached with Energy Dispersive X-Ray Analyzer(SEM-EDX) was

关键词： oolitic limestone reservoir acetic acid dissolution kinetics mechanisms the rotateng-disk corrosion reactor system

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The multi-factor recombination and processes superimposition model for hydrocarbon accumulation:application to the Silurian in the Tarim Basin

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Petroleum Science 2008年第1期5卷 13-19页

作者： Meng Qingyang Pang Xiongqi Gao Jianbo state key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China Research Center CNOOC Beijing 100027 China

The multi-factor recombination and processes superimposition model for hydrocarbon accumulation is put forward in view of the hydrocarbon geological characteristics of multiple episodes of structural evolution, multiple sets of source-reservoir-seal assemblage, multiple cycles of hydrocarbon accumulation and multiple episodes of readjustment and reconstruction in the complex superimposed basins in china. It is a system including theories and methods that can help to predict favorable exploration regions. According to this model, the basic discipline for hydrocarbon generation, evolution and distribution in the superimposed basins can be summarized in multi-factor recombination, processes superimposition, multiple stages of oil filling and latest stage preservation. With the Silurian of the Tarim basin as an example, based on the reconstruction of the evolution history of the four factors （paleo-anticline, source rock, regional cap rock and kinematic equilibrium belt） controlling hydrocarbon accumulation, this model was adopted to predict favorable hydrocarbon accumulation areas and favorable exploration regions following structural destruction in three stages of oil filling, to provide guidance for further exploration ofoil and gas in the Silurian of the Tarim basin.

关键词： Multi-factor recombination processes superimposition Tarim Basin Silurian favorable exploration region prediction

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