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The equilibrium between diagenetic calcites and dolomites and its impact on reservoir quality in the sandstone reservoir of Kela 2 gas field

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Progress in Natural Science:Materials International 2007年第9期17卷 1051-1058页

作者： Gao Zhiqian1,Yu Bingsong2,3 and Lai Xingyun2,3(1.School of Energy resources,china university of geosciences,beijing 100083,china 2.state key laboratory of geological processes and mineral resources,china university of geosciences,beijing 100083,china 3.Ministry of Education key laboratory of Lithosphere Structure,Deep processes and Exploration Technique,china university of geosciences,beijing 100083,china) School of Energy resources China University of Geosciences Beijing 100083 China state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China Ministry of Education key laboratory of Lithosphere Structure Deep Processes and Exploration Technique China University of Geosciences Beijing 100083 China

Based on the equilibrium theory of chemical reactions between water and rocks,this paper establishes a thermodynamic phase relationship diagram among calcites,dolomites and water solution under the condition of diagenesis based on the thermodynamic database of related minerals and fluids and dolomite's degree of order *** has been discovered that the equilibrium between calcites and dolomites in the diagenetic environment is strongly impacted by temperature and the Ca/Mg ratios in groundwater,and that the dolomite's degree of order in the diagenetic environment is a function of crystallization temperature and time,not controlled by water ***,the authors make a further analysis of the close relationship of chemical reaction between carbonate cements and pore water in the sandstone reservoirs of Kala 2 gas field in Kuche *** can be seen that there are different impacts on sandstone reservoir quality among the equilibrium system of calcites,dolomites and pore water at different depths of reservoirs.

关键词： diagenesis equilibrium between calcites and dolomites secondary pores Kela 2 gas field

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Indian Ocean-MORB-type isotopic signature of Yushigou ophiolite in North Qilian Mountains and its implications

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Science china Earth Sciences 2006年第6期49卷 561-572页

作者： HOU Qingye1,2, ZHAO Zhidan1,2, ZHANG Hongfei3, ZHANG Benren3 & CHEN Yuelong2 1. state key laboratory of geological processes and mineral resources, china university of geosciences, beijing 100083, china 2. School of Earth Science and mineral resources, china university of geosciences, beijing 100083, china 3. Faculty of Earth Sciences, china university of geosciences, Wuhan 430074, china 1. state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China 2. School of Earth Science and mineral resources China University of Geosciences Beijing 100083 China 3. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China

In order to explore the disputed issue concerning the tectonic affinity ofthe ancient ocean mantle of North Qilian Mountains (NQM), geochemical and Sr, Nd, Pb isotopiccompositions of pillow basalts of the Yushigou Ophiolite (YSGO) suite from NQM have been analyzedsystematically. The pillow basalts exhibit tholeiitic characteristics, with flatchondrite-normalized REE patterns ((La/Yb)_N = 0.98—1.27). They display no Nb, Ta, Zr, Hf negativeanomalies, and show MORB features in 2Nb-Zr/4-Y and Ti/100-Zr-YX3 tectonic discrimination *** results indicate that the Yushigou ophiolite is most likely to be formed in a mid-ocean ridgeor mature back-arc basin. Their isotopic data show a relatively broad and enriched ^(87)Sr/^(86)Sr(0.70509 — 0.70700), restricted ^(143)Nd/^(144)Nd (0.512955-0.512978). Pb isotopes are in the rangeof ^(206)Pb/^(204)Pb (18.054-20.562), ^(207)Pb/^(204)Pb (15.537-15.743) and ^(208)Pb/^(204)Pb(38.068-38.530). These isotopic data imply that the basalts originated from the depleted mantle(DMM), with the involvement of enriched mantle components (mainly EMII). Geochemical comparisonsbetween the basalts in YSGO and the MORB-type basalts of ophiolite suites occurring in the knownancient Tethyan tectonic domain indicate that the ancient oceanic mantle represented by YSGO suiteforming in early Paleozoic in the North Qilian Moutains is very similar to the Tethyan mantle inboth trace elements and isotopic compositions. The North Qilian Mountains should be a part of theTethyan tectonic domain in early Paleozoic. This further implies that the Tethyan tectonic domaincan be deduced to early Paleozoic in the study area, which will be helpful to discussing thetectonic affinity and evolution of the North Qilian Mountains.

关键词： geochemistry, Indian Ocean-MORB-type isotopic signatures, Tethyan tectonic domain, Yushigou ophiolite, North Qilian Mountains.

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Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area

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Science china Earth Sciences 2006年第4期49卷 397-407页

作者： DENG Jun1,2, WANG Qingfei1,2 , HUANG Dinghua3 , WAN Li4, YANG Liqiang1,2 & GAO Bangfei1,2 1. state key laboratory of geological processes and mineral resources, china university of geosciences, beijing 100083, china 2. key laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of Geo- sciences, beijing 100083, china 3. Faculty of Earth Sciences, china university of geosciences, Wuhan 430074, china 4. School of Mathematics and Information Science, Guangzhou university, Guangzhou 510405, china 1. state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China 2. key laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing 100083 China 3. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China 4. School of Mathematics and Information Science Guangzhou University Guangzhou 510405 China

Abundant studies revealed that shallow intrusions of the Yanshanian epoch resulted in the mass mineralization of the Tongling region. Various evidences showed there existed a concealed magma chamber at ?10 km depth in the middle part of this region during Yanshanian epoch, from which the ore-forming magma was generated and then transported to the superficial layer. Yet the transport network and flow mechanism of the shallow ore-bearing magma, the key problem associ- ated with ore-forming process, was relatively little focused on. Integrate analysis of structural me- chanics, statistical fractal and geological facts suggested that NE trending high-angle fold-related thrust faults and the tessellated basement ones served as the main pathways for the shallow magma’s transporting, moreover, the saddle void spaces among adjacent strata in the folds upon this fault system provided the place for magma’s emplacement. So the folds in the upper part and faults in the lower part of the upper crust constituted the fluid’s transport and emplacement network. During the deformation of geologic body with multi-layer structure, the layers in the upper part tended to fold when received the jacking stress from the lower part, while the lower one inclined to fault undergoing loads of the upper part. And the producing probability of this structure assemblage was highly in- creased in the condition, such as in the Tongling area, that the mechanic rigidity of the lower layers was stronger than that of the upper ones. For the pre-existence of fluid-conducting network, the top magma with high volatile in the magma chamber transported rapidly to the superficial layer in dyking pattern, located in the void spaces of folds, filled and reconstructed them. The sudden drop of pres- sure caused the fluid unmixing from the magma and mass ore-forming elements concentration. Pulse activity of the dyking may be the principal reason why magmatic bodies in the Tongling area were spatially-temporally con

关键词： Tongling, structural network, magma intrusion, fractal, dyke.

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3D geological Modeling with Multi-source Data Integration in Polymetallic Region:A Case Study of Luanchuan,Henan Province,china

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地学前缘 2009年第S1期16卷 166-167页

作者： Gongwen Wang~(1,2),Shouting Zhang~(1,2),Changhai Yan~3,Yaowu Song~3,Limei Wang~1 1.School of Earth Sciences and resources,china university of geosciences(beijing),beijing 100083,china. 2.state key laboratory of geological processes and mineral resources,china university of geosciences,beijing 100083,china 3.Henan Institute of geological Survey,Zhengzhou 450007,china

The development of 3D geological models involves the integration of large amounts of geological data,as well as additional accessible proprietary lithological, structural,geochemical,geophysical,and borehole ***,the case study area,southwestern Henan Province,is an important molybdenum-tungsten -lead-zinc polymetallic belt in china.

关键词： 3D geological modeling multi-source data mineral exploration metallogenic model virtual geological section Luanchuan polymetallic region

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Study of thrust and nappe tectonics in the eastern Jiaodong Peninsula, china

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Science china Earth Sciences 2007年第2期50卷 161-171页

作者： ZHANG HongYuan1,2, HOU QuanLin3? & CAO DaiYong4 1 china university of geosciences, beijing 100083, china 2 state key laboratory of geological processes and mineral resources, china university of geosciences, beijing 100083, china 3 Graduate university of Chinese Acacemy of Sciences, beijing 100039, china 4 key laboratory of Coal resources (CUMT), Ministry of Education, beijing 100083, china 1. china university of geosciences Beijing 100083 China 2. state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China 3. Graduate university of Chinese Acacemy of Sciences Beijing 100039 China 4. key laboratory of Coal resources (CUMT) Ministry of Education Beijing 100083 China

Thrust and nappe tectonics have affected the eastern Jiaodong Peninsula, the easternmost terminal of the Sulu Ultra-high Pressure Metamorphic Belt. Four nappes have been mapped, named respectively the Shidao, Rongcheng, Mishan and Mouping nappes. The methods used included multi-scale struc- tural analysis and structural chronology analysis. These nappes define four deep level slip-thrust shear zones that were mainly active in the Mesozoic. The amount of ductile deformation decreases from the Shidao to Rongcheng to Mouping to Mishan shear zones, and shows an inverse relationship with temperature. 40Ar/39Ar chronological analysis and the chronological results of former workers reveal four movement steps defined by the development of thrusts and nappes in the late Triassic (210-180 Ma), extensional movement from the Jurassic to early Cretaceous (180-130 Ma), slip-thrust movement in the Early Cretaceous (130-120 Ma), and extensional movement since the Late Cretaceous (120 Ma). The order of boundary shear zone motion in the period of slip-thrust movement during the Early Cre- taceous (130-120 Ma) was along the Shidao, Rongcheng, Mouping and finally the Mishan shear zone. This resulted in clockwise rotation of the nappes relative to block west to the Tan-Lu Faults. Because of the similar evolutionary history of the Tan-Lu Faults and the thrust and nappe structure in the eastern Jiaodong Peninsula, slip dislocation along the Tan-Lu Faults might have been absorbed by thrust and nappe tectonics in the Jiaodong area in the Mesozoic era, resulting in much less dislocation on the Tan-Lu faults in North Eastern china than that in south along the Jiaodong Peninsula.

关键词： eastern Jiaodong Peninsula Mesozoic era thrust and nappe tectonics structural features geochronology shear zones

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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 100037, china 2 state key laboratory of geological processes and mineral resources, china university of geosciences, beijing 100083, china 3 Graduate School of china Acacemy of Sciences, beijing 100039, china 4 key laboratory of Coal resources (CUMT), Ministry of Education, beijing 100083, china 1. Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China 2. state key laboratory of geological processes and mineral resources China University of Geosciences Beijing 100083 China 3. Graduate School of china Academy of Sciences Beijing 100039 China 4. 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/39Ar 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 130Ma 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/39Ar strikeslip and thrust belt.

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Timing,scale and mechanism of the destruction of the North china Craton

Timing,scale and mechanism of the destruction of the North C...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： ZHU RiXiang~(1*),CHEN Ling~1,WU FuYuan~1 & LIU JunLai~2 1 state key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing 100029,china 2 state key laboratory of geological processes and mineral resources,china university of geosciences,beijing 100083,china

The North china Craton(NCC) is a classical example of ancient destroyed *** the initiation of the North china Craton Destruction Project by the National Natural Science Foundation of china,numerous studies have been conducted on the timing,scale,and mechanism of this destruction through combined interdisciplinary *** data suggest that the destruction occurred mainly in the eastern NCC,whereas the western NCC was only locally *** sedimentation, magmatic activities and structural deformation after cratonization at -1.8 Ga indicate that the NCC destruction took place in the Mesozoic with a peak age of ca 125 Ma.A global comparison suggests that most cratons on Earth are not destroyed,although they have commonly experienced lithospheric thinning;destruction is likely to occur only when the craton has been disturbed by oceanic *** destruction of the NCC was coincident with globally active plate tectonics and high mantle temperatures during the *** subducted Pacific slab destabilized mantle convection beneath the eastern NCC,which resulted in cratonic destruction in the eastern *** and/or thermal-mechanical-chemical erosion resulted from the destabilization of mantle convection.

关键词： timing scale and mechanism craton destruction North china Craton

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Apatite fission track thermochronology application to the mineralization of Dashui gold deposits,Gansu province,northern Qinghai-Tibet plateau.

Apatite fission track thermochronology application to the mi...

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第九届全国固体核径迹学术研讨会

作者： WANMING YUAN1 ZENGKUAN BAO2 JINQUAN DONG2 HONGYANG Li3 SHICHENG WANG2 1.state key laboratory of geological processes and mineral resources,china university of geosciences,beijing,100083,china 2.laboratory of Nuclear analysis techniques,Institute of High Energy Physics,Chinese Academy of Sciences,beijing,100039,china3.Shijiazhuang university of Economics,Shijiazhuang,050031

Dashui gold ore district is located at southern foot of Xiqingshan mountains,geographical coordinates of longitude 101°59′ 00″ east and latitude 35°05′ 00″ north,northern Tibet-Qinghai *** gold mineralization was highly related to magmatic activities of quartz diorite,vein rock and cryptoexplosion *** NW-SE fault zones controled the ore deposit *** in both ore district and region mainly are Lower Triassic dolomite and limestone that did not be ore *** the whole,this belongs to low-to-moderate temperature magrnatie hydrothermal deposit.

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Spatio-temporal carbon isotope variation during the Ediacaran period in South china and its impact on bio-evolution

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Science china Earth Sciences 2009年第10期52卷 1520-1528页

作者： WANG XinQiang1 & SHI XiaoYing1,2 1 School of Earth Science and mineral resources, china university of geosciences, beijing 100083, china 2 state key laboratory of geological processes and mineral resources, beijing 100083, china School of Earth Science and mineral resources China University of Geosciences Beijing 100083 China state key laboratory of geological processes and mineral resources Beijing 100083 China

The Ediacaran period is characterized by the extremely negative carbon isotope anomalies and great biotic evolution in Earth history. At least four negative carbon isotope anomalies have been reported from this interval in South china so far. It is traditionally argued that the isotope variations can be used as a useful tool for global correlation of Ediacaran succession; however, more and more researches argued against this idea. We reviewed the previously published carbon isotope data in South china, and distributed the mean values of a certain time to the paleogeographic maps. The results show that the carbon isotope values (δ13C) vary greatly in different environments, but a clear tendency of becoming lighter from shallow platform to deep basin, with a maximum variation up to 1‰ Moreover, the important changes in Ediacaran biota, marked by the introducing of new taxa or ecologic groups, seemed to always postdate the negative anomalies but coincide with the positive shift. If the negative excursions represented the oxidation of a large dissolved organic carbon (DOC) reservoir in the ocean, the diverse Ediacaran organisms and the carbon isotope anomalies may suggest totally different environments: oxic and anoxic/euxinic. We also suggest that the elimination of euxinic state through precipitation of pyrites is one of the important environment factors in prompting the Ediacaran bio-evolution.

关键词： Ediacaran South china carbon isotope spatio-temporal variations bio-evolution

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Late Mesozoic metamorphic core complexes: new constraints on lithosphere thinning in North china

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Progress in Natural Science:Materials International 2006年第6期16卷 633-638页

作者： LIU Junlai, GUAN Huimei, JI Mo and HU Ling (state key laboratory of geological processes and mineral resources, china university of geosciences, and key laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of geosciences, beijing 100083, china) [a] state key laboratory of geological processes and mineral resources China University of Geosciences Key Laboratory of Lithosphere Tectonics Beijing China [b] Lithoprobing Technology of Ministry of Education China university of Geosciences Beijing China

Metamorphic core complexes (mcc’s) are among the most prominent structural styles of lithosphere extension and thinning during late Mesozoic in North china. In this paper, the geometrical, kinematic and age characteristics of some of the mcc’s, e.g. Liaonan, Waziyu (Yiwulushan), Yunmengshan, etc., are discussed. Some common characteristics, such as kinematic polarity, geometric asymmetry, occurrence over a time span, scattered and isolated distribution, and progressive development, can provide direct constraints on the regional lithosphere extension and thinning in North china, which does not favor the prevailing plume model, a general de-lamination model or extensional collapse of overthickened orogenic crust. We argue that several aspects, such as the kinematic polarity at depths during lithosphere extension, gradual break-up of lithosphere plate, relationship between magmatism and regional extension, and coeval activity of mcc’s and Tan Lu fault, should be taken into consideration when constructing a more reasonable model for lithosphere extension and thinning in North china.

关键词： North china late Mesozoic metamorphic core complex lithosphere extension and thinning.

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