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2005 Vol.14 Issue.1,
Published 2005-03-31
1
THE ENGH HAD DUCTILE SHEAR DEFORMATION OF MIDDLE JURASSIC XIUFENG FORMATION IN THE NORTHERN PART OF DAXINGANLING, INNER MONGOLIA
WU Li-wen, CHEN Zhi-yong, GUO Ling-jun, ZHNG Ming
The Engh Had ductile shear zone occurs in the glutenite of Middle Jurassic Xiufeng formation in Mohe basin in the northern part of Daxinganling Mountains.The geometric,kinematic and dynamic characteristics show that the ductile shear zone is dextrally slanted thrust shear zone from northwest to southeast.In the condition of compression from south to north,with a heat source provided by the syntectonic acid intermediate magmatic rock, the ductile shear deformation took place in the glutenite of Xiufeng formation along or across layers.At the same time,the strong ductile deformation promoted the activation and migration of Au in the glutenites.The ductile deformation zone and derived brittle structures perform the transferring channels for ore forming fluid and space for ore deposition.
2005 Vol. 14 (1): 1-4,36 [
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5
SINGLE-GRAINED ZIRCON U-Pb AGE OF THE CHANGTE'AOBAO GRANODIORITE IN CENTRAL INNER MONGOLIA
ZHU Hong-chen, PANG Qing-bang
The Changte aobao granodiorite is located in the south of Sonid Zuoqi,Central Inner Mongolia.The high precision single-grained zircon U-Pb age is dated as 362±4 Ma (MSWD=0.005),confirming that the pluton was formed in the middle of Late Paleozoic era.Based on this and other isotopic data,the granotoids formed in the middle of Late Paleozoic can be divided into two belts from north to south.
2005 Vol. 14 (1): 5-7 [
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41
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8
CHARACTERISTICS OF THE ASSEMBLAGES OF ACCESSORY MINERALS IN GRANITOIDS IN EASTERN JILIN AND HEILONGJIANG PROVINCES
LI Jun-jie
The granitoids broadly distributed in eastern Jilin and Heilongjiang Provinces have a long forming history with complete types.Genetically, the granites are mainly of I type,with subordinate A-type,minor S-type and rare M-type.The assemblages of accessory minerals of the granites show evident characteristics,which can be the classification criteria for the granites.
2005 Vol. 14 (1): 8-11 [
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12
SIGNIFICANCE AND GEOCHEMICAL CHARACTERISTICS OF RARE EARTH ELEMENTS OF JINSHAN GOLD DEPOSIT,JIANGXI PROVINCE
LIU Zhi-yuan, JIN Cheng-zhu, WANG Rong-hu, LIANG Jun-hong, ZHANG Kai-ping
The Abundance and distribution of rare earth elements(REE)are related to the formatin and evolution of geologic bodies in Jinshan gold deposit.By analyzing and comparing the REE characteristics of wall rock,altered rock zone and ores from the deposit,it is concluded that the REE migrated and enriched during the rock fluid interaction,with inheritance of some constituents from original rocks at the same time.The geochemical characteristics of REE in the auriferous quartz veins indicate that the ore forming fluids are multi-source in nature.The quartz veins are formed by the cooperation of hydrothermal alterations and structural movements at different ore forming stages.The siliceous rock in the orefield,which was firstly found by the study,is geochemically a kind of hydrothermal sedimentary rock mixed with volcanic and/or terrigenous materials,suggesting a hydrothermal exhalative mineralization in the deposit.
2005 Vol. 14 (1): 12-17 [
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18
WALL-ROCK ALTERATIONS OF THE GOLD METALLOGENIC SERIES IN TULASU VOLCANIC BASIN,WESTERN TIANSHAN
JIA bin, JIN Cheng-zhu
Yiermande gold deposit,Axi gold deposit and Tawuerbieke gold deposit in Western Tianshan area,formed in Late Proterozoic Tulasu volcanic basin,are three distinct types of ore deposits,with different wall rock alteration features.The wall rocks of Yiermande type of gold deposit produce such alterations as silicification,kaolinization,baritization and dickitization.The contents of As,Sb,Hg and Cu have a positive relation to Au.The wall rocks of Tawuerbieke type show silicification,sericitization,chloritization and carbonation.The content of As in wall rocks raise along with that of Au and Ag.The wall rock alterations of Axi type include mainly sericitization,adularization,carbonation,silicification and illitization.The Se and As contents are positively relaed to Au and Ag in the altered rock.
2005 Vol. 14 (1): 18-22,17 [
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23
ORE-CONTROLLING STRUCTURES IN PANGXIDONG Ag(Au) DEPOSIT, NORTHWEST GUANGDONG: Characteristics and regularities of structural control to rebodies
SUN Hua-shan, CAO Xin-zhi, ZHANG Ke
Metallogenetically,ore-controlling structure plays a role of ore-holding space.On the other hand,it is an important reason for the migrateion,concentration and precipitation of ore-forming material.For the purpose of metallogenetic prediction,however,prospectors pay more attention to ore-searching information or indicators,especially those macroscopical signs that can be simply and easily identified.The Pangxidong Ag(Au) deposit is a representative of its type in Northwest Guangdong Province.It is hosted in the altered rock of ore-controlling structure in the contact belt between Precambrian and Lower Paleaozoic compound gneiss and late Yanshanian granite.The orebodies are strictly restricted by the controlling structures in veins or lens.The variation of the forms and attributes of ore-controlling structures obviously affect the positioning of orebodies.The intersecting of differently oriented structures is the direct reason for the widened and thickened orebodies.
2005 Vol. 14 (1): 23-27,52 [
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28
GEOLOGY AND METALLOGENESIS OF THE PRECIOUS METAL DEPOSITS IN THE SOUTH MARGIN FAULT ZONE OF ALTUN MOUNTAIN, XINJIANG
LIU Guo-fan, ZHU Guang-bin, CHEN Jin-duo, YANG Zhen-jun, QIN Shuang
The south margin faulted zone of Altun Mountain in Xinjiang is a regional upper mantle deep structure,along which numerous basic-ultrabasic complex bodies are distributed.The elements of Cu,Au,Pt and Pd are concentrated in the late stage of magmatic crystallization and differentiation.With later tectonic hydrothermal process,commercial copper-gold-platinum-palladium deposits are formed in Qingshuiquan and other places.There is a great potential for the exploration in Altun area.
2005 Vol. 14 (1): 28-32 [
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33
THE GEOLOGIC FEATURES OF BAIGANHU W-Sn DEPOSIT IN EAST KUNLUN MOUNTAINS,XINJIANG
LI Hong-mao, LIU Zhong, SHI You-dong, WANG Su, WANG Zheng-Ke
The Baiganhu W-Sn deposit,occurring in the metamorphic rock series of Paleoproterozoic Jinshuikou Group,is closely related to the Caledonian acidic intrusive rocks.The studied area is with a high geochemical background of W-element.The enrichment coefficients of W range from 9.57 to 25.30 in various geologic bodies.Total 17 ore bodies have been discovered with scheelite ore of skarn type and wolframite ore of quartz vein type.The deposit belongs to the stratabound hydrothermal superimposed type of W-Sn deposit.
2005 Vol. 14 (1): 33-36 [
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39
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37
GEOLOGICAL CHARACTERISTICS AND GENESIS OF HUANGGOUSHAN LEAD-ZINC DEPOSIT IN JILIN PROVINCE
FENG Shou-zhong, SUN Chao, HUANG Lin-ri
The Huanggoushan Pb-Zn deposit,occurring in the dolomite marble of Mesoproterozoic Zhenzhumen formation,is obviously controlled by strata.Study on the geology,the Zn/Pb ratio of ore-forming elements,the microelements in galena and sphalerite,the S and Pb isotopic compositions,the inclusions of minerals and the source bed shows that it is a stratabound deposit of sedimentation reformation type.Sedimentation is the basis for the source of ore-forming material;while reformation is the essential factor for the forming of the deposit. The Zhenzhumen formation is the source bed for ore-forming material.
2005 Vol. 14 (1): 37-42,70 [
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43
SIGNIFICANT PROBLEMS OF MINING ENVIRONMENTAL GEOLOGY IN NORTHEAST CHINA
JIA Wei-guang, WANG En-de, JIN Hong-tao, DI Zhi-qiang
Northeast China is an important mining industrial base,where a series of environment geology problems occur in the mining processes.The problems are known as devastation of land resources,environmental pollution and geologic hazard.The solution to the problems is to establish a monitring system for geologic hazard information by new and high technology,make a plan for the ecologic restoration in mining area,and promote "green mining".
2005 Vol. 14 (1): 43-45,80 [
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46
REMOTELY SENSED SPATIAL ENVIRONMENTAL EFFECTS DURING EXTRACTION OF MINERAL AND ENERGY RESOURCES: Case Studies of Fuxin Coal Mine and Paishanlou Gold Mine, China
Malogo J. M. Kongola, WANG En-de
The main purpose of this study was to apply remote sensing techniques in assessing spatial environmental effects caused by extraction of mineral and energy resources, with two case studies of the Fuxin Coal Mining Group and Paishanlou Gold Mine, in China. Landsat MSS, TM and ETM+imageries were used in this study. The used image enhancement and processing techniques were contrast stretching, density slicing, spatial altering and color composites. With enhanced imageries, different surficial materials were recognized. It was found that, as a result of the rated spatial resolution for Landsat TM data, areas over 900 m
2
(30×30 m) in size could be detected with high accuracy, but those under that threshold could hardly be detected. Following the fact that the dimensions of almost all of features were above the 900 m
2
threshold, Landsat TM and ETM+data were judged suitable in this study. This observation indicates that Landsat TM and ETM+imageries can adequately be used for mapping and assessing environmental changes at PGM and FCMG. Furthermore, the use of satellite data in environmental studies is effective, quick and less labor intensive.
2005 Vol. 14 (1): 46-52 [
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53
CONTROL AND RECOVERY OF GROUNDWATER DEPRESSION
DU Ji-zhong, XIAO Guo-qiang
The affection of groundwater depression to local environment has heen unnecessarily overemphasized and exaggerated.Groundwater depression is a natural phenomena while groundwater is pumped out.By analyzing and comparing several groundwater depressions in Northeast and North China,it can be found that regional hydrogeological condition and pumping intensity affect their forming and developing.The groundwater depressions can be controlled and restored as well.It may be developed to geo-disaster only when it is out of control.The correct understanding to the characteristics and changes of depressions will be helpful to the exploration for groundwater resource and avoidance of geo-environmental problems.
2005 Vol. 14 (1): 53-57 [
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58
RESEARCH OF SUSTAINABLE QUANTITY FOR REGIONAL WATER RESOURCES
ZHU Chang-jun, YANG Wei-hua, LI Shu-wen
By analysis on the status of water resources in Handan, Hebei Province, a sustainable quantity model for regional water resources of Handan is established. In the modeling, the idea of decision-making variable deduction is adopted to deal with the relationship between surface water,groundwater and meteoric water for a sustainable utilization of water resources. Under such an idea, a rational utilization plan for the water resources in the region is optimized by the model.
2005 Vol. 14 (1): 58-60 [
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61
ANALYSIS ON THE CONTROL OF MONITORING NETWORK FOR GEOLOGIC ENVIRONMENT IN LIAONING PROVINCE
ZHAO Lian-cai, ZHANG Wei, YANG Jing, ZHANG Jin-ping, LI Peng, JIN Su
Based on the characteristics of geology,hydrogeology and geomorphology of Liaoning, the distribution of moni toring network for geologic environment in the province is mainly for the environment of groundwater.With the development of national economy and technology,the monitored objects are expanding from simply groundwater to geologic hazards.To meet the demands of sustainable development,the network should be adjusted and perfected on the basis of the techniques of GIS,RS and GPS,with the information source from the monitored data,to realize automatically real time environmental monitoring and analyzing.
2005 Vol. 14 (1): 61-62,77 [
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63
APPLICATION OF SOIL MAGNETISM SURVEY IN THE STUDY ON ORE-FORMING ENVIRONMENT OF LEACHABLE SANDSTONE URANIUM
DENG Ju-zhi, LIU Qing-cheng, GONG Yu-ling, FANG Geng-xian
Soil magnetism survey is a new geophysical method that developed in recent years.The method can be used to solve some geological problems by measuring the magnetism of soil sample.This paper discusses the feasibility of soil magnetism survey in the study on ore-forming environment of leachable sandstone uranium deposit.The anomaly characters of soil magnetism at the oxidation zone front are summed up by the application research for Dongsheng area, Inner Mongolia.
2005 Vol. 14 (1): 63-66 [
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67
APPLICATION OF GEOLOGICAL 3-D MODELING AND DIGITAL SIMULATION IN OIL DEPOSIT EXPLORATION IN YOUFANGZHUANG OIL FIELD
ZHU Guang-she
Through geologic 3-D modeling for the C-1 reservoir in D-31 well area of Youfangzhuang oil field in Ordos Basin,the distribution of residual oil in the area is studied by numerical fitting on geologic reserves,oil production,water cut and pressure.The residual oil is essentially distributed on structural high,un-flooded main channel of deposit,outside of drainable area of well and production well without perforation.To various distribution patterns of residual oil,three methods are developed for production adjustment,including new adjusting well and sidetracking of old wells,perfection of injection production pattern,and productin engineering potential development.The estimation for production index indicates that the numerical modeling and production adjustment are effective.
2005 Vol. 14 (1): 67-70 [
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71
THE ESTABLISHMENT OF THE SPACE DATABASE FOR GEOLOGIC DISASTER SURVEY AND DISTRICT DEMARCATION OF NANFEN DISTRICT,BENXI CITY,LIAONING PROVINCE
LI Jing, CHEN Yue-yue, LIN Xiu-min
The establishment of geologic disaster survey and district demarcation space database for counties and cities is an important part of the special project of National Geologic Disaster Survey for Counties and Cities.With the geologic disaster survey and district demarcation information system as the essential tools,aided by MapGIS and FoxPro,the article expatiates the process of the establishment of the geologic disaster survey and district demarcation space database for Nanfen District,Benxi City,Liaoning Province.
2005 Vol. 14 (1): 71-73 [
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74
INTEGRATIVE ASSESSMENT OF MINERAL RESOURCES
YIN De-tao, JIN Cheng-zhu
Mineral resources assessment is closely related to geologic exploration.Since 1960s,the governments of countries and regions of the world have been concerned for the assessment of mineral resources.In recent years,the focus of the assessment in China has been shifted from an economically static evaluation during exploration to the synthesized dynamic evaluation for exploration,development and markets as a whole.Geographic information system (GIS) is broadly applied in the mineral resources assessment.The integrative assessment of mineral resources is a dynamic and synthetic one in a global scale,with the functions of prediction and diagnosis.
2005 Vol. 14 (1): 74-77 [
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78
DISCUSSION ON THE POTENTIAL AND STRATEGY OF HYDROCARBON RESOURCES IN CHINA
FENG Ming, CAO Cheng-run, CHEN Li, WU Hai
With China's economic development,the consumption of petroleum and gas is increasing.China has become the second largest country for oil and gas consumption in the world.With 40% of oil imported from overseas, the oil reserves and products in China is not enough to meet the needs of this country s modernization.Thus the strategy for the exploration of potential oil and gas resources for China in the 21st century should be:developing more gas industries,expanding international oil market,sharing worldwide oil resources,enlarging the reserves of old oil fields and raising the utilization efficiency of energy.
2005 Vol. 14 (1): 78-80 [
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