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Chinese science Bulletin 2001年第4期46卷 330-333页

作者： CHEN Nengsong, SUN Min, ZHANG Kexin & ZHU Yunhaifaculty of earth sciences, china university of geosciences, wuhan 430074, china Department of earth sciences, The university of Hong Kong, Hong Kong SAR, china faculty of earth sciences China University of Geosciences Wuhan China Department of earth sciences The University of Hong Kong Hong Kong SAR China

Single-grain zircon U-Pb and amphibole 40Ar-39Ar dating have been conducted on a deformed and metamorphosed diorite in the East Kunlun Orogenic Belt, which intruded into the middle Proterozoic Kuhai Group exposed in the south of Xiangride region, Dulan County, NW Qinghai Province. The zircon gives a concordant U-Pb age of (446.5±9.1) Ma. The amphibole yields Ar plateau age of (488.0±1.2) Ma and an isochronal age of (488.9±5.6) Ma. Age results of both stepwise released Ar and conventional K-Ar analysis are remarkably higher than that of zircon U-Pb, suggesting that the amphibole contains excess argon and the amphibole plateau age cannot be taken as the timing of metamorphism or deformation. The zircon age is interpreted to be crystallization age of the diorite pluton, which suggests that an Early-Paleozoic magmatic zone indeed existed in the East Kunlun Orogenic Belt stretching along the region south to the Golmud, Normuhong and Xiangride.

关键词： East Kunlun Orogenic Belt metadiorite geochronology excess argon.

Sand Dunes Fixation in Baiji District, Iraq

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Journal of china university of geosciences 2002年第1期13卷 67-72页

作者： Ayad Mohammed Fadhilfaculty of earth Resources , china university of geosciences , wuhan 430074 faculty of earth Resources China University of Geosciences Wuhan 430074

This study was carried out at Sand Dunes Stabilization Researches Station in Baiji district (230 km north of Baghdad, Iraq) to evaluate the effects of local soil conditioners manufactured from oil derivatives and plant residuals on sand dunes fixation as the first step for sand dunes stabilization. The results indicate that the fuel oil has the first place in improving wind erosion parameters in the study area, such as increasing mean weight diameter, dry aggregates percentage, the needed time for complete disaggregation by dry sieving, and decreasing the disaggregation rates. Bitumen emulsion occupies the second place, while the plant residuals occupies the third place and has slight effects on the studied parameters. Effects of conditioners on natural vegetation cover are negative in oil derivatives treatments, while positive in plants residuals treatments.

关键词： sand dunes fixation soil conditioners wind erosion Iraq.

Desertification Risk Monitoring for NorthShaanxi Province, china, Using NormalizedDifference Vegetation Index (NDVI)

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Journal of china university of geosciences 2002年第1期13卷 58-66,94页

作者： Mushtak Talib Jabbarfaculty of earth Resources , china university of geosciences , wuhan 430074 faculty of earth Resources China University of Geosciences Wuhan 430074

In this study, the remote sensing is applied to the examination of the relationship between desertification and normalized difference vegetation index (NDVI) in the context of northern Shaanxi Province. This relationship is also examined using spatial analysis methods. A strong negative correlation is found in the largest area desert, indicating that the relationship between desert and NDVI is not a simple linear one and that the correlation coefficient between NDVI and vegetation abundance is significant. The normalized difference vegetation index (NDVI) was compared with other vegetation index-based methodologies. NDVI is a valuable first-cut indicator for such systems, although the analysis and interpretation of its relationship to desertification are complex and also based on the detailed analysis of its relationship to ecological zone, vegetation type and season. Conclusions thus made would help to upgrade the methodology as an effective tool for early-warning desertification in the northern Shaanxi Province where a drought is a recurring threat. This methodology includes the integration of NDVI with other socio-economic and bio-physical indicators in CIS, the complementation of desert area data with satellite data, and the analysis of the relationship between NDVI and specific climatic zones, for each season and vegetation type.

关键词： desert desertification remote sensing NDVI china.

Relic UHP Structures in Dabie-Sulu Region, china: Structural Expression and Geodynamic Significance

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Journal of earth science 2000年第3期19卷 40-46页

作者： Suo Shutian Zhong Zengqiu You Zhendong Zhou Hanwen faculty of earth sciences, china university of geosciences, wuhan 430074, china

The present day observed tectonic framework of ultrahigh pressure (UHP) metamorphic belt in the Dabie Sulu region was dominantly formed by an extensional process at 200-170 Ma, under amphibolite facies conditions, following the Triassic collision between the Sino Korean and Yangtze cratons. UHP relic structures, including massive eclogites with a weak foliation, UHP shear zones and A type folds, that are preserved in less retrograde metamorphism and deformation overprinted eclogite lenses can be recognized using the tectonic analysis. Examples are drawn from the Chengmagang area and Hejiawan area, Hubei; Bixiling area, Anhui, and Donghai area, northern Jiangsu. A speculative kinematic model is proposed for the collision between the cratons based on the UHP relic structures studied, in combination with the data of petrography, geochronology and P T path of UHP metamorphic rocks in the studied region which were reported in literature. It is stressed that only the early UHP relic structures, particularly, regionally consistent foliation and stretching lineations, record and reflect the formation of the UHP metamorphic rocks, and the relative dynamic and kinematic process related to the Triassic NNE directed oblique collision between the Sino Korean and Yangtze cratons.

关键词： UHP relic structure extensional process compressional regime stretching lineation Dabie Sulu region.

Development of Overpressure in the Tertiary Damintun Depression, Liaohe Basin, Northern china

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Acta Geologica Sinica(English Edition) 2003年第3期77卷 402-412页

作者： YE Jiaren, HAO Fang and CHEN Jianyufaculty of earth Resources, china university of geosciences, wuhan, Hubei 430074 E-mail: jrye@*** Ren Xifei and Zhu Xiling faculty of earth Resources China University of Geosciences Wuhan Hubei 430074

The Damintun depression is one of the four depressions in the Liaohe basin in northern china, and is a rift basin developed in the Paleogene. This paper discusses in detail the characteristics of pressure and fluid potential of the Damintun depression based on a synthesis of the data from boreholes, well tests and seismic surveys. Data from sonic logs, well tests and seismic velocity measurements are used to study the pressure characteristics of the areas. From the sonic log data, shales can be characterized as normally pressured, slightly overpressured or highly overpressured; from the well test data, the pressure-depth gradient in oil-producing intervals implies hydrostatic pressure in general. Most seismic profiles in the Damintun depression are of sufficiently high quality for seismic velocities to be measured. The fluid pressures, excess pressures and pressure coefficients in 47 representative seismic profiles are predicted using formula calculation methods, and further transformed to fluid potenti

关键词： overpressure seismic data pressure evolution fluid potential Damintun depression Liaohe basin china

Cu－An　Metallogenic　Series　Related　to　Volcanic－Intrusive　Complexes　in　Eastern　china

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Journal of earth science 1995年第1期14卷 107-113页

作者： Zhai Yusheng(Department of Geology and Mineral Resources, china university of geosciences,Beijing 100083)Yao Shuzhen(faculty of earth Resources, china university of geosciences,wuhan 430074)

The Cu - An co - existence ore deposits related to intermediate- acidic volcanic - intrusive complexes are widespread in eastern china. They can be divided into 5 types: (1) sharn type, (2 )porphyry type, (3)vein type, (4 )breccia pipe type and (5)stratabound type. All of those have intimate spatial, temporal and genetic relations formed by the Mesozoic tertonicmatic - hydrothermal activities in certain geological environments. The magmatic and Cu-An metallogenic ager were predominately in Late Mesozoic (179-90 Ma), and in the period of 150-120 Ma the ore-forming Processes reached the Peak. The main geological Settings of Cu-An ore-forming Processes are: (1) continental margins, including the Peripheral depression of the continental Plate, (2) deep fault zones in the continental Plate,(3)continental rift belt. The magmatic activities were under the combined control of basement fault (s )and superficial fault (s ), and mostly formed the continental volcanic basins. The regional Cu-An metallogenic zones occur along the deep fault zones in WNW - EW direction,such as the Tongling metallogenic subzone, or in NE-NNE direction, such as the Dexing metallogenic subzone. Most of Cu- An ore deposits are related to subvolcanic stocks consist of quartz diorite, granodiorite, quartz porphyry, andesite porphyry, trachyte porphyry and other rocks, which belong to the calc- alkaline series and the I - type granitoid. The spatial zoning of matals from the center to periphery of the stocks is: CU (Mo )→ Cu,Au→Cu, Ph, Zn,An →Ph, Zn, Ag →Ph, Ag. There is a typical venical metallic zoning (from surface to 3 000m in depth ) in Yinshan Cu-An-Ph-Zn-Ag ore deposit, northeastern Jianxi Province.

关键词： Cu-An ore deposit metallogenic series volcanic-intrusive complex,Mesozoic eastern china.

Experiment of the ^(40)Ar/^(39)Ar dating of diagenetic illite in gas reservoirs

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Chinese science Bulletin 2004年第S1期49卷 89-93页

作者： WANG Longzhang, DAI Tongmo & PENG Ping’an State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, china faculty of Resources, Chinese university of geosciences, wuhan 430074, china 1. State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry CAS 510640 Guangzhou China 2. faculty of Resources Chinese University of Geosciences 430074 Wuhan China

40Ar/39Ar dating of diagenetic illite has been performed to investigate gas reservoirs in the Sulige Gas Field of the northern Ordos Basin. A series of technical challenges were confronted, including illite purification, Ar recoil loss, and separation of diagenetic illite from detrital illite. Mineral growth ages for diagenetic illite were obtained by this experiment, from which the age of gas emplacement was deduced to be later than 169 Ma.

关键词： 40Ar/39Ar dating diagenetic illite purification of clay minerals Ar recoil loss time of gas emplacement.

Diagenesis and Restructuring Mechanism of Oil and Gas Reservoir in the Marine Carbonate Formation,Northeastern Sichuan:A Case Study of the Puguang Gas Reservoir

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1173-1181页

作者： DU Chunguo1, 2, WANG Jianjun1, ZOU Huayao2, ZHU Yangming3 and WANG Cunwu4 1 Research Institute of Petroleum Exploration and Development, Beijing 100034, china 2 Petroleum university of china, Beijing 102249, china 3 Department of earth science, Zhejiang university, Hangzhou 310027, china 4 faculty of earth Resources, china university of geosciences, wuhan 430074, china faculty of earth Resources China University of Geosciences Wuhan 430074 China

Based on the technology of balanced cross-section and physical simulation experiments associated with natural gas geochemical characteristic analyses, core and thin section observations, it has been proven that the Puguang gas reservoir has experienced two periods of diagenesis and restructuring since the Late Indo-Chinese epoch. One is the fluid transfer controlled by the tectonic movement and the other is geochemical reconstruction controlled by thermochemical sulfate reduction (TSR). The middle Yanshan epoch was the main period that the Puguang gas reservoir experienced the geochemical reaction of TSR. TSR can recreate the fluid in the gas reservoir, which makes the gas drying index higher and carbon isotope heavier because C2+ (ethane and heavy hydrocarbon) and 12C (carbon 12 isotope) is first consumed relative to CH4 and 13C (carbon 13 isotope). However, the reciprocity between fluid regarding TSR (hydrocarbon, sulfureted hydrogen (H2S) , and water) and reservoir rock results in reservoir rock erosion and anhydrite alteration, which increases porosity in reservoir, thereby improving the petrophysical properties. Superimposed by later tectonic movement, the fluid in Puguang reservoir has twice experienced adjustment, one in the late Yanshan epoch to the early Himalayan epoch and the other time in late Himalayan epoch, after which Puguang gas reservoir is finally developed.

关键词： diagenesis and restructuring mechanism marine carbonate formation thermochemical sulfate reduction Puguang gas reservoir

Study on optimization of iron-based matrix formula for hot pressed diamond bit

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金刚石与磨料磨具工程 2008年第S1期28卷 156-160页

作者： Yang Yang Pan Bingsuo (faculty of Engineering,china university of geosciences,wuhan 430074,china)

A new type of iron-based matrix formula as a potential substitute for traditional WC-based matrix formula for hot pressed diamond bit was ***,phosphor-iron,663-Cu,nickel,cobalt and certain additives were selected as the studied formula *** matrix performances,the hardness and wear resistance were chosen as experimental indexes in this *** uniform design method was used for the formula design of iron-based *** forms of regression models of matrix hardness and wear resistance were obtained by regression analysis using ***,the optimization of matrix formulae and matrix performances were also achieved through constrained nonlinear *** was found that matrix hardness,significantly affected by the factor of Ni-Co-additives and Fe,increased with the increment of Ni-Co-additives,Fe and P-Fe,but reduced with the increase of *** the other hand,matrix wear resistance is mainly affected by Fe;the effect of the interaction between Fe and P-Fe is also relatively obvious. The increment of 663-Cu powder may result in a slight improvement in matrix wear *** addition,the results of nonlinear programming revealed that the predictive optimum value of hardness was 139.5 HRB and the optimum wear resistance was 0.056 g,whereas they could not reach the optimum value at the same time.

关键词： formula optimization stepwise regression P-Fe alloy matrix performance

Fractal and Multifractal Modeling of Hydrothermal Mineral Deposit Spectrum: Application to Gold Deposits in Abitibi Area, Ontario, Canada

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Journal of china university of geosciences 2003年第3期14卷 199-206页

作者： Cheng Qiuming Department of earth and Atmospheric science, Department of Geography, York university, Toronto, Canada M3J1P3 faculty of earth Resources, china university of geosciences, wuhan 430074 Department of earth and Atmospheric science Department of Geography York University Toronto Canada M3J1P3 faculty of earth Resources China University of Geosciences Wuhan 430074

A number of fractal/multifractal methods are introduced for quantifying the mineral deposit spectrum which include a number-size model, grade-tonnage model, power spectrum model, multifractal model and an eigenvalue spectrum model. The first two models characterize mineral deposits spectra based on relationships among the measures of mineral deposits. These include the number of deposits, size of deposits, concentration and volume of mineral deposits. The last three methods that deal with the spatial-temporal spectra of mineral deposit studies are all expected to be popularized in near future. A case study of hydrothermal gold deposits from the Abitibi area, a world-class mineral district, is used to demonstrate the principle as well as the applications of methods proposed in this paper. It has been shown that fractal and multifractal models are generally applicable to modeling of mineral deposits and occurrences. Clusters of mineral deposits were identified by several methods including the power spectral analysis, singularity analysis and the eigenvalue analysis. These clusters contain most of the known mineral deposits in the Timmins and Kirkland Lake camps.

关键词： mineralization spectrum power-spectrum multifractal spectrum eigenvalue spectrum and GIS modeling