检索结果-南通市图书馆

Regional fractures and denudation of gold ore deposits in Gangdise block,Tibet:Evidence of Ag/Au values

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2001年第S1期44卷 121-127页

作者：李胜荣邓军侯增谦肖润袁万明冯效良赵志丹申俊峰周肃 1. Department of Earth Science and Resources China University of Geosciences 100083 Beijing China 2. Institute of Ore Deposit Geology Chinese Academy of Geosciences 100037 Beijing China 3. Bureau of Geology and Mineral Resources 850000 Lhasa China 4. Institute of High Energy Physics Chinese Academy of Sciences 100080 Beijing China 5. Institute of Geology and Mineral Resources Ministry of Land and Resources 610082 Chengdu China

Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.

关键词： : Ag/Au ratio regional fracture denudation gold ore deposit Tibet.

Exploration on compound water circulation system to solve water resources problems of North china Plain

在线全文

学校读者我要写书评

暂无评论

Journal of Groundwater Science and Engineering 2016年第3期4卷 229-237页

作者： LIU Ji-chao SHI Jian-sheng GAO Ye-xin REN Zhan-bing Institute of Hydrogeology and Environmental Geology CAGSShijiazhuang 050061China Wuan City Land Resources Bureau Handan 056300China

In order to solve water resources problems in the North china Plain, this paper explored human-nature compound water circulation system from three aspects including urban flood control, surface drainage and saline water in the central and eastern of the North china Plain. Results show that:(1) The technical methods have achieved zero increase in rainwater runoff in urban areas,(2) surface drainage depletion problems can be solved through abandoned water and river water separation method,(3) and technical method through promoting rainwater infiltration would be used to solve problem of saline water in the central and eastern parts. This research provides a new perspective to the ultimate solutions to water resources problems in the North china Plain, and a fresh research direction for the development of hydro-geological science.

关键词： North china Plain Saline water Rainwater Water circulation Compound system

A fast-imaging method for airborne gravity gradient data based on tensor invariants

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Geophysics 2022年第2期19卷 284-293,309页

作者： Zhou Shuai Wei Yue Wu Yan-gang Jiao Jian Lu Peng-yu Jiang Dan-Dan College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China

Airborne gravity gradient data contain additional short-wavelength information about the buried geological *** study develops a fast interpretation method based on the gravity gradient data for the sources’spatial location and physical property *** study analyzes the advantages of the source parameter inversion method based on tensor *** proposes a normalized fast-imaging method based on tensor invariants to quickly estimate the spatial location parameters of sources through the local maximum value position of the imaging ***,the tensor invariant characteristics and the imaging method’s effect in a simple model are analyzed using a theoretical ***,to analyze the imaging method’s application effect in complex model conditions,the method’s applicability is quantitatively analyzed using the data added with noise,superimposed anomalies of adjacent sources,and anomalies of deep and shallow geological *** theoretical model’s simulation results show that the model’s imaging results in this study have satisfactory performance on the spatial position estimation of the ***,the method is applied to the gravity anomaly data corresponding to the Humble salt *** imaging results can effectively estimate the distribution of the salt dome’s horizontal and depths,verifying the practicability of the method.

关键词： gravity gradient tensor invariants imaging method spatial location parameters

The Research on the Analysis and Application of Detecting Underground Civil Air Defense with GPR

在线全文

学校读者我要写书评

暂无评论

World Journal of Engineering and Technology 2015年第3期3卷 52-58页

作者： Yongqing Yang Xiaohui Sun College of Civil and Transportation Engineering Hohai University Nanjing China College of Construction Engineering Qingdao Huanghai University Qingdao China

On the basis of the principle of Ground Penetrating Radar (GPR) method and geophysical characteristics, this paper discusses in detail detection method of civil air defense distinguished by GPR under the complex geological condition through using the analysis and application in the survey of underground civil air defense as an example. Three dimensional image of the defense clearly reflects its underground structure. Test result has the greatly high detection precision. This example illustrates the effectiveness and practicability of GPR in the respect of detection of the civil air defense and also accumulates experiences for the application of GPR in urban geological survey.

关键词： GPR Civil Air Defense Complex geological Condition Three Dimensional Image

Evolution of pore fluid of low porosity and permeability reservoir in Qinnan Sag:a case study of 29-2 structurein Qinhuangdao area

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Global Geology 2017年第2期20卷 80-88页

作者： XU Simeng PENG Xiaolei LIU Na LIU Li WANG Qingbin LIU Xiaojian JIN Xiaoyan College of Earth Sciences Jilin UniversityChangchun 130061China Tianjin Branch of CNOOC Ltd. Tianjin 300452China

The southeast depression of Qinnan Sag is a potential oil-gas exploration region in the Bohai Sea area. With the analysis of large quantity of rock thin sections,scanning electron microscope and the physical property data of reservoir,the authors studied the petrological characteristics and the evolution of pore and fluid of sandstone in the deeper strata in 29-2 structure in Qinhuangdao area. The results show that the evolutionary tendency of Paleogene sandstone reservoir porous fluid in research area is changed from alkaline porous fluid to acidic porous fluid,and back to alkaline porous fluid. There are three stages of reservoir porous evolution in Qinhuangdao area,namely sharp decrease in porosity due to mechanical compaction,increase in porosity because of corrosion and dissolution,and remarkable reduction owing to carbonate cementation.

关键词： Qinnan Sag Paleogene reservoir petrological characteristics evolution pore fluid

Experimental Study on Adsorption of Rare Earth Elements on Kaolinite and Halloysite

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第S1期91卷 80-82页

作者： GAO Yuhong FAN Chenzi XU Hong National Research Center for Geoanalysis School of Earth Sciences and Resources China University of Geosciences (Beijing)

1 Introduction The weathered crust rare earth deposits is one of the most significant rare earth deposits,which are mostly distributed in southern china,especially in the south of Jiangxi province(Chi et al.,2007).The compositions of these deposits,which are weathered from igneous rocks such as granite through biological,physical or chemical

关键词： In Experimental Study on Adsorption of Rare Earth Elements on Kaolinite and Halloysite REE than

Sr Isotope Geochemistry and Depositional Setting of Carbonate in Ordovician,Ordos Basin,china

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2014年第S1期88卷 262-264页

作者： WANG Zhuozhuo ZHANG Yongsheng ZHENG Mianping SHI Lizhi XING Enyuan Institute of Mineral Resources CAGS R&D Center for Saline Lake and Epithermal Deposit CAGS Key laboratory of Saline Lake Resources and Environment Ministry of Land and Resources

china is in severe shortage of potash reserves,and the best way for breakthrough is to make potash exploration in marine salt *** basin is so far the only Ordovician potash basin in the *** Erdos basin is located west

关键词： Sr isotope Depositional settings Basin evolution Ordos basin Ordovician

Biogeographic characteristics of Zhesi brachiopod fauna and reconstruction of tectonopaleogeography of Jiamusi-Mongolia Block

在线全文

学校读者我要写书评

暂无评论

Global Geology 2012年第2期15卷 85-96页

作者： WANG Chengwen LI Ning ZONG Pu College of Earth Sciences Jilin University Changchun 130061 China School of Earth and Space Sciences Peking University Beijing 100871 China

The Kungurian-Capitanian （Permian） Zhesi branchiopod fauna is mainly composed of cold-water typed taxa with high diversity and abundance. This fauna is similar with the coeval brachiopod faunas from Ti- man-Pechora, Svalbard, and Queen Elizabeth Islands of the Boreal Realm, with no real ＂warm-water＂ species. Zhesi brachiopod fauna is a cold-water fauna and should be assigned to the Boreal Realm. Considering the paleogeographic characteristics of this fauna and the basic rationale of paleobiogeographie provinces being controlled by latitude-temperate, and that the above areas were located at 50°N -70°N in the global paleoclimate reconstruction map compiled by Boucot et al. , the paleo-latitude of the southern margin of Jiamusi-Mongolia Block, where developed the Zhesi brachiopod fauna, is suggested ranging from 40°N to 60°N. Zhesi brachiopod fauna is an endemic fauna, containing more than 75% endemic species and self-grouped as a biogeographic province, termed Inner Mongolia Province. These characteristics indicate that this area was closed or semiclosed at that time. On the Jiamusi-Mongolia Block, the Herlen-Jiamusi Old-land as an obvious ＂continental barrier＂ hindered the northward migration of the Zhesi brachiopod fauna and the immigration of brachiopod species from other areas. The Tarim plate has collided with the Kazakhstan plate and the western part of South Tianshan-Beishan-Xar Moron Ocean has been closed. At the same time, the western margin of Jiamusi-Mongolia Block was joined with the Tarim plate. The Xar Moron Ocean in south of Jiamusi-Mongolia Block was wide e- nough and the ocean temperature rose gradually southward, so that it is not suitable for the cold-water brachiopods to survive and thrive on the northern margin of the North china plate. Thus, the ocean with large width and high temperature formed another natural barrier for the southward migration of the cold-water brachiopods.

关键词： Zhesi brachiopod fauna Jiamusi-Mongolia Block reconstruction of tectonopaleogeography paleo- latitude ocean-land allocation relationship

The determination of accretionary complexes of the Yarlung Zangbo Rive in the south Tibet and its tectonic significance

在线全文

学校读者我要写书评

暂无评论

The determination of accretionary complexes of the Yarlung Z...