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2008 Vol.17 Issue.4,
Published 2008-12-31
241
THE LATEST VOLCANIC ACTIVE STAGE IN LATE HOLOCENE EPOCH IN NORTHEAST CHINA
PENG Yu-jing, LI Jing-chun, ZHANG Guang-yu, ZHANG Yun-ping
The Late Holocene volcanic activities in Northeast China are severely intense. The volcanic active stage in 1200 AD±has been well studied by previous geologists. Based on historical documents, thermoluminescence dating and isotopic age of
14
C, as well as the newest achievements by geological survey, the latest volcanic active stage around 1720 AD in Late Holocene Epoch is confirmed. Study on such volcanic active stage is importantly significant to the exploration of the rhythms of volcanic activities and early warning of geologic hazards.
2008 Vol. 17 (4): 241-244,249 [
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DYNAMIC SETTING ANALYSIS FOR FUTURE ERUPTION OF TIANCHI VOLCANO IN CHANGBAISHAN MOUNTAIN
ZHAO Qing-ying, LI Chun-feng, ZHENG Zhi-feng, LI Ai-li
The dynamic setting for future eruption of Tianchi volcano in Changbaishan Mountain is analyzed with the focal mechanism and tectonic geology. Study on the focal mechanism of anatectic earthquake shows that subduction of the West Pacific plate to Northeast China makes the near-west-east pressure in Tianchi region. The direction of the maximum principal compressive stress axis in the area is trending NEE. Research on structural geology reveals that NWW-trending faults around Tianchi are active since late Pleistocene. The future eruption of Tianchi volcano is possibly controlled by the subduction of West Pacific plate and the NWW-trending strike-slip faulting. On this basis, the dynamic setting for the future eruption of Tianchi volcano is put forward.
2008 Vol. 17 (4): 245-249 [
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250
GEOCHEMICAL CHARACTERISTICS AND FORMING ENVIRONMENT OF THE CARBONIFEROUS GABBRO IN YADUWULA MOUNTAIN AREA, MIDDLE DAXINGANLING
ZHENG Ping, ZHANG Yong-zheng, LI Zhen-xiang, JU Wen-xin, WANG Zhong
Large area of gabbro occurs in the Mt Yaduwula region in the middle section of Daxinganling Mountains. The gabbro is lithochemically with the characteristics of sub-alkaline and tholeiitic rock series. To compare with oceanic type of ultrabasic rocks, the gabbro in Mt Yaduwula area is characterized by low Mg content, with notable positive Rb and Th anomalies and relative deficiency of high field strength elements. The rock is rich in Cr, Ni, Co, V and Ti, suggesting a mantle source. The gabbro is in a zircon U-Pb age of 532 Ma, formed in Late Carboniferous, showing an extensional tectonic environment in the Mt Yaduwula area of Middle Daxinganling Mountains. The magma of gabbro is derived from the mantle (deep source), formed in a transitional environment of submarine rift and epicontinental island arc.
2008 Vol. 17 (4): 250-253,272 [
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254
THE TRIASSIC LEFT-LATERAL DUCTILE SHEAR ZONE OF TAN-LU FAULT ZONE AND ITS DEFORMATION IN NORTHERN LIAONING PROVINCE
LI Dong-tao, HU Jin-wei, LI Jing-hong, SUN Peng-hui, WANG Xiao-ou, LIU Zhong-yuan
The section of Tan-Lu fault zone in northern Liaoning Province, as a part of Yilan-Yitong fault zone, is actually the regional northward extension of the Tan-Lu fault zone. The NE-trending Triassic left-lateral ductile shear zone is discovered during the regional geological survey in 1:50000 scale. The ductile shear zone controls the distribution of a series of Triassic intrusive rocks and reforms the extension of Paleozoic geologic bodies.
2008 Vol. 17 (4): 254-258 [
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259
CHARACTERISTICS OF ORE AND OCCURRENCE OF GOLD IN JIJIAWA GOLD DEPOSIT, HENAN PROVINCE
WU Chang-hang, FU Hai-mei, LI Jiang-shan, ZHANG Zhen-guo, MA Chun-ping, HAN Xin-zhi
Based on the study of gold ore characteristics and gold occurrence in Jijiawa gold deposit, Henan Provinee, it is concluded that the deposit is dominated by oxidized ore, with increasing primary ores in the deep. The minerals are diverse in the ore. The major metallic mineral is pyrite, with gangue minerals mainly quartz, plagioclase and sericite. The auriferous mineral, dominantly native gold, is unevenly distributed in the ore, occurring as intergranular gold and fracture gold. The size of the gold particles is about 0.005-0.1 mm. The fineness of gold, characterized by multistage and vertical zoning, is obviously controlled by temperature.
2008 Vol. 17 (4): 259-263 [
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DISCUSSION ON THE METALLOGENIC LAW AND PROSPECTING ORIENTATION OF GOLD IN THE SOUTH SECTION OF AILAOSHAN METALLOGENIC BELT
GUO Xiao-dong, ZOU Yi-lin, ZHANG Feng, ZHANG Yu-jie
Ailaoshan metallogenic belt is the most advantaged gold belt in Southwest China. The gold metallogenesis is closely related to fault structure and magma activity of Himalaya epoch. The spatial distribution of ore belt and position of ore bodies are strictly controlled by structures. Based on the analysis of regional metallogenic characteristics and orecontrolling factors, with all kinds of synthesized information about metallogenic prospecting, four gold prospective areas (A1, A2, B1 and B2) are delineated. The prospecting types, criteria and targets are also pointed out.
2008 Vol. 17 (4): 264-272 [
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273
GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTION OF HAOLIBAO COPPER-MOLYBDENUM DEPOSIT IN ARHORQIN, INNER MONGOLIA
SHEN Guang-yin
Haolibao copper-molybdenum deposit is of hydrothermal vein and porphyry type related to the Yanshanian crypto-explosive breccia-plagioclase granite porphyry and cataclastic sub-quartz-porphyry. The copper-molybdenum ore bodies are controlled by the crypto-explosive breccia pipe and rock body. The mineralization occurs in the altered cryptoexplosive breccia and silicified belt. The further exploration should be focused on the contact zone between the plagioclase porphyry granite and wallrocks, as well as the cataclastic sub-quartz-porphyry with geochemical abnormity and low resistance-high polarization anomaly.
2008 Vol. 17 (4): 273-277 [
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278
GEOLOGY AND GENESIS OF THE HUAAOBAOTE LEAD-ZINC DEPOSIT IN INNER MONGOLIA
LI Zhen-xiang, XIE Zhen-yu, LIU Zhao, LI Shu-guo
The large-scale Huaaobaote vein type of Ag-Pb-Zn polymetal deposit in Xi Ujimqin Qi, Inner Mongolia, occurring in the fracture zone in Lower Permian Shoushan formation, is of subvolcanic meso-epithermal genesis. The deposit is located in the Xilinhot-Huolin Gol polymetal metallogenetic belt in the middle-south of Daxinganling Mountains, with developed faults and intense volcanic activities. The metallogenesis of Ag-Pb-Zn polymetal is in multiple stages. The vein-shaped ore bodies are in medium scale, complex shapes, stable thickness, evenly distributed components, and controlled by NW-, NE- and N-S-trending faults. The wall-rock alterations are developed in 3 stages, with obvious zonation. The metallogenic epoch is Late Jurassic.
2008 Vol. 17 (4): 278-281,277 [
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282
THE RELATIONSHIP BETWEEN STRUCTURE AND METALLOGENESIS IN THE LAILISHAN TIN DEPOSIT IN YUNNAN PROVINCE
DING Xiu-fang, GAO Jian-guo, TAO Li, ZHAO Chang-jiang, XU Heng
The Lailishan tin ore field in Yunnan Province is located in the western margin of the south section of Sanjiang tectonic zone, where fault structures are especially developed. With analysis on the characteristics of ore-controlling structure in the ore field, the relationship between structure and metallogenesis are discussed. It is believed that fault structures play an important role in the process of mineralization. The faults in the ore field are characterized by multistaged movement, with compresso-shear in the early and tenso-shear in the late. The post-magmatic ore-bearing hydrothermal fluid migrates along the contact fracture zone or external fracture zone and forms the ore by filling and replacing. Therefore, the fault structures are the necessary conditions for mineralization. The mineralization is closely dependent on the structure.
2008 Vol. 17 (4): 282-285,301 [
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GEOLOGICAL CHARACTERISTICS AND FORMING ENVIRONMENT OF THE POLYMETAL NODULES IN THE EASTERN PACIFIC CC AREA
LI Guo-sheng
Based on the geological sampling and laboratory testing for the polymetal nodules in Eastern Pacific CC area, with submarine photographing and multi-frequency excitation and spectrogram (MFES) method, the morphology, types, abundance, coverage, grade, chemical composition and distribution of the nodules are studied. The forming environment of the nodules is discussed on the basis of the geological background, topography and geomorphology in the CC area. Study on the distribution regularity and forming environment of the nodules reveals the relationship between the formation and geological environment, which provides scientific basis for the forming mechanics study and resources assessment of the nodules, as well as the development and utilization of the submarine polymetal resources.
2008 Vol. 17 (4): 286-291 [
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A DYNAMIC ANALYSIS ON THE GROUNDWATER CHEMISTRY IN TONGYU COUNTY, JILIN PROVINCE
LI Xiao, DI Zhi-qiang, CHAI Lu
Based on the analysis on the hydrochemistry of groundwater and its changing characteristics in Tongyu County, Jilin Province during 1991 to 1995, it is discovered that the hydrochemical composition of the area is complex, with heavy contamination, especially the serious fluorine pollution. The fluorine content in groundwater trends to increase year after year. The contents of major ions in groundwater are closely correlated with precipitation and evaporation.
2008 Vol. 17 (4): 292-296 [
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STUDY ON THE GEOTHERMAL WATER RESOURCE IN SHIJIAZHUANG DEPRESSION
HU Jun-chun, GUO Chun-qing
The geothermal resources have been exploited in Shijiangzhuang depression for a long history. Hydrochemistry and isotopic tracing studies are carried out for the geothermal fields in order to assess the heat energy potentials and the exploration prospect. Analysis on the geological background, available geothermal information and buried condition of hot water, as well as geochemical and isotopic characteristics of the water from geochemical dill holes, rainwater and surface water, indicates that the underground thermal water in Shijiangzhuang depression is characterized by constant temperature and large amount, with a great economic potential.
2008 Vol. 17 (4): 297-301 [
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GEOCHEMICAL CHARACTERISTICS OF HEAVY METAL ELEMENTS IN PADDY AND CORN FROM TIELING, LIAONING PROVINCE
WU Ai-jun, CHEN Yue-yue, LING Shuang, WU Hai-hong
Research on the distribution of heavy metal element contents in paddy and corn from Tieling, Liaoning Province indicate that, heavy metal elements, especially Pb, Zn, Cd and Cr, share a common distribution rule, i.e. the high content spots are all distributed around heavily polluted area, such as Chaihe lead-zinc ore field and the lower reaches of Chaihe River. Comparison between Chaihe lead-zinc ore filed and Tieling area as background value shows that the distribution of heavy metal elements in paddy and corn is much correlated to the background environment such as soil and shallow groundwater. The heavy metal elements in paddy and corn can enter human body through food chain and harm the health.
2008 Vol. 17 (4): 302-306 [
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THE NUMERICAL SIMULATION STUDY OF LARGE-SCALE OVERALL FRACTURING OIL RESERVOIR WITH LOW PERMEABILITY IN ORDOS BASIN
LI Huai-jie
For its particularity, the numerical simulation of large-scale overall fracturing oil reservoir with low permeability in Ordos Basin is quite difficult at present. In accordance with the characteristics of Wuliwan low-permeable oil reservoir and its well-testing interpretation result, the author adjusts the reservoir permeability reasonably around the well bottom hole on the basis of equal permeating resistance method. At the same time, with the technology of cross-well conductivity adjusting and local grid refining on the basis of equal conductivity method, the fractures created by hydraulic fracturing measure in the reservoir are simulated. As a result, the regression of production data is perfect. Under different production rates and injection/production ratios, the strategic limitation for production technology is discussed. A reasonable technologic strategy of production is then designed to provide rational theoretical guidance to the development of this kind of oil field.
2008 Vol. 17 (4): 307-311 [
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CHARACTERISTICS OF THE T
3
-J
1
RADIOLARIAN CHERT AND POTENTIAL FOR HYDROCARBON IN EASTERN HEILONGJIANG PROVINCE
MA Jin-ping, ZHANG Ting-ting, XUE Lin-fu
The Mesozoic radiolarian cherty strata contain abundant planktic microfossils,which provide rich lipid and organic materials commonly associated with marine hydrocarbon source rocks rich in oil and gas. Large amounts of hydrocarbon have been extracted from such strata. Some of them have become famous major oil fields. A lot of radiolarian cherty is found in the T
3
-J
1
strata in Eastern Heilongjiang Province during recent geological survey, although previous exploration was not targeted at these strata for oil and gas. Study shows that the T
3
-J
1
radiolarian cherty strata will be made such a potential target in the not too distant future.
2008 Vol. 17 (4): 312-313,317 [
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DESIGN AND DEVELOPMENT OF THE MAPOBJECT-BASED PROSPECTING INFORMATION MANAGEMENT SYSTEM FOR METALLIC DEPOSITS
JIA Jun-qian, HAO Li-bo, GAO Qiu-hua, LIU Yang
With the increasing difficulty of prospecting, the exploration based on the combination of multi-information and various methods has become the common measure. One of the key problems that geologists are facing is how to utilize the available mineral exploration information reasonably and quickly to serve new deposit searching. Based on the research of exploration information, a prospecting information management system for metallic deposit is designed and developed by the authors, with MapObject as developing platform and Visual Basic 6.0 as developing language.
2008 Vol. 17 (4): 314-317 [
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THE RS-AND GIS-BASED SPATIOTEMPORAL ANALYSIS ON LAND USE CHANGES IN FUSHUN, LIAONING PROVINCE
QI Xiao-jun, WANG En-de
The RS and GIS technology and landscape index method are adopted to study the landscape characters and their dynamic changes of Fushun, Liaoning Province in 1998 and 2005. The results indicate that, from 1998 to 2005, the acreage of shrubbery and dry land decreased, while the continuity of woodland and shrubbery increased. In regard to the landscape level, the SHDI (Shannon-Wiener Diversity Index), SHEI (Shannon-Wiener Evenness Index) and FRAC (Fractal Dimension) of land increased, but the Dominance, Contagion and AI (Aggregation Index) of land decreased. About patch level, the FRAC of all patch types, but shrubbery and woodland, increased, and the AI of all patch types except woodland decreased. The whole landscape therefore shows a trend of fragmentation.
2008 Vol. 17 (4): 318-320 [
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