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2011 Vol.20 Issue.4,
Published 2011-08-31
241
REVISION OF THE ORDOVICIAN WUBINAOBAO FORMATION IN HONGGOR AREA, INNER MONGOLIA
Baoyinwuliji, HE Hong-yun, SOMG Hua, JU Wen-xin, HAN Zong-qing
During the 1:50000 regional geological survey in Honggor area on the north of Erenhot, Inner Mongolia, near the border between China and Mongolia, the Ordovician Wubinaobao formation is redefined on the basis of rock association, paleontological characteristics, depositional environment, etc. The revised Wubinaobao formation includes a set of layers of slate and siltstone with intercalations of thin limestone lenticules, containing fossils of Trilobita, Brachiopoda, etc. The strata are characterized by neritic shelf sedimentation. This redefinition is significant for the oreprospecting in this area from now on.
2011 Vol. 20 (4): 241-244 [
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GEOLOGIC CHARACTERISTICS OF THE TAPINGGOU COPPER-MOLYBDENUM DEPOSIT IN ARUN QI, INNER MONGOLIA
PANG Hong-wei, HONG Xiu-wei, WANG De-zhang
The Tapinggou copper-molybdenum deposit, located in the north section of the Daxinganling polymetallic metallogenic province, is of porphyry type discovered in recent years. The deposit is medium-sized, buried in the depth of 34.6 m and more, with orebodies dominated by Mo in sulfide minerals. The Cu-Mo deposit is composed of ten molybdenum orebodies and one copper body. The grade of molybdenum ranges from 0.071% to 0.268%. The maximum extension of orebody is 930 m, with the thickest monolayer of 106.89 m. The metal content is preliminarily estimated in excess of 20000 tons.
2011 Vol. 20 (4): 245-248 [
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249
METALLOGENIC PROSPECT PREDICTION BY GRAVITY SURVEY IN DUNHUA-SHANGZHI AREA, JILIN PROVINCE
ZHANG Hong-pu, LI Ning, LI Zhi-cheng, LIU Yu-tian, LIU Zong-yi, HAO Fu-an, ZHANG Zuo-xin
Based on the result of 1:200 000 regional gravity survey, the characteristics of gravity field in DunhuaShangzhi area, Jilin Province are interpreted to infer the structural controlling regularities to rocks and ores. With study on the relationship between the distribution of deposits and the gravity field, some metallogenic prospect areas are predicted, involving 9 endogenetic metal prospect areas, 4 coal-bearing areas and 3 iron-polymetal areas. High-precision geomagnetic and transient electromagnetic methods areas are suggested to probe the shapes and spatial distribution laws of the orebodies in the prospect areas.
2011 Vol. 20 (4): 249-254 [
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255
METALLOGENY OF THE GEM DEPOSITS IN BASALT IN BAISHAN AREA, JILIN PROVINCE
CHEN Jing-lin, XING Cai-xia
Baishan City is rich in mineral resources, with various kinds of gem deposits, which are importantly significant for scientific research and economic development. Based on the study of the regional structural background for the forming of the gemstone ores in alkali basalt, this paper discusses the forming conditions, characteristics and metallogenic regularities of related sapphire and olivine deposits.
2011 Vol. 20 (4): 255-257 [
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258
DISCUSSION ON THE METALLOGENY AND GENESIS OF THE LEAD-ZINC DEPOSITS IN QINGCHENGZI OREFIELD, LIAONING PROVINCE
SHA De-xi, LIU Hong-jin, LI Guo-shu
The metallogenesis of Qingchengzi Pb-Zn deposits is controlled by strata and rock formation. The dome structure caused by the emplacement of Paleoproterozoic granite, the ductile shear zone and interlayer fault in overlying stratiform rock series, and the Mesozoic magmatism and fault structure significantly contribute to the metallogenesis. The ore deposits are of complex polystage, with three metallogenic epochs during the periods of Paleoproterozoic synsedimentation emplacement, Luliangian metamorphic-deformation re-emplacement and Mesozoic tectonomagmatic reemplacement, respectively. The deposits are genetically stratabound ones with metamorphism-deformation and hydrothermal superimposition on the basis of submarine (spout) hydrothermal deposition, belonging to submarine exhalation sedimentary metamorphic-magmatic hydrothermal reformation type.
2011 Vol. 20 (4): 258-264 [
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265
PRELIMINARY STUDY ON THE REGIONAL CORRELATION OF LIAOHE GROUP IN EASTERN LIAONING, CHINA
ZHAO Li-jun, ZOU Hong-yi, QU Hong-xiang, LV Xiao-yu, HOU Jing
The Liaohe Group, widely distributed in Eastern Liaoning Province, is a set of Paleoproterozoic stratiform meso-epimetamorphic rocks. There exist considerable variations in the characteristics of lithologic association in different places because of the sedimentary facies changes of the initial rocks, as well as the reformation by later metamorphism and deformation. After years of field investigation, the authors approximately divided the Liaohe Group into two districts and four phase sections. The study will hopefully solve the problems of not only the division of stratigraphic sequence and regional comparison for Liaohe Group, but also the contemporary stratigraphic correlation with adjacent areas.
2011 Vol. 20 (4): 265-267 [
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268
CONSTRUCTION OF GROUNDWATER RESERVOIR IN THE COASTAL VALLEYS OF LIAONING PROVINCE
ZHAO Li-bo, LI Shun, WEN De-juan
Based on the classification of the groundwater storage in the coastal valleys of Liaoning, the feasibility of the construction of groundwater reservoir in the major coastal valley areas is studied from the aspects of underground structure, boundary conditions, capacity and supply source of the storage space. With analysis on the key elements for the construction of groundwater reservoirs, it is concluded that the coastal valley areas with Liugu River, Xingcheng River, Fuzhou River and Dengsha River fulfill the basic requirement.
2011 Vol. 20 (4): 268-271 [
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272
DENSITY DISTRIBUTION OF CARBON IN SOIL AND RESERVES OF CARBON IN THE LIAOHE RIVER BASIN
YU Cheng-guang, YANG Xiao-bo, LIU Ming-hua, WANG Dan-yang, WANG Da-peng
Based on the data of organic carbon and total carbon in both surface and deep soil by the multi-purpose geochemical survey in Liaohe Basin, the carbon reserves in the soil of Liaohe Basin are calculated. The distribution of carbon density is analyzed. According to the calculation, in the area of 52.3 km
2
, the carbon reserves in deep level are 860.50 Tg; those in the middle level, 538.30 Tg; while in the surface, 138.76 Tg. The soil carbon density in deep level is 16.45 Gg/km
2
; that in middle level, 10.28 Gg/km
2
; while that in the surface, 2.65 Gg/km
2
. The soil carbon reserves in different soil types, geological units, ecosystems and land-use types are also calculated respectively. The result will provide a scientific basis for the research on soil carbon circulation and the assessment of environmental effect.
2011 Vol. 20 (4): 272-277 [
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ORE-CONTROLLING CONDITIONS OF THE VEIN-TYPE LEAD-ZINC DEPOSITS IN THE CRETACEOUS RED BEDS IN FENGHUANG-MAYANG AREA IN THE SOUTHWEST EDGE OF YUANMA BASIN
FU Sheng-yun, LI Ze-hong, ZHENG Zheng-fu
The Yuanma basin is a Mesozoic fault basin, with many lead and zinc mineralized occurrences in the western edge. The deposits are in vein type hosted in the sandstone-conglomerate of Cretaceous red beds, in large size, with high grade and easily dressing and smelting ores. The characteristics of the deposits and ore-controlling conditions are analyzed. It is significant for the mineral exploration in the area.
2011 Vol. 20 (4): 278-281 [
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GEOLOGY AND METALLOGENY OF THE COPPER DEPOSITS IN THE SHANGSHAXIMAO FORMATION IN NORTHWEST GUIZHOU: A case study of the Tiaotai copper deposit in Xishui County
YANG Guang-long, CUI Deng-wei, YANG Xu, ZHONG Zu-feng, ZHANG Hui
The cupreous sandstone type of copper deposit in Renhuai-Xishui area, Northern Guizhou Province occurs in the red beds in the large inland basin on the edge of Sichuan platform-depression. The ore-bearing rocks are mainly the arkose containing silicified or carbonized wood of Middle Jurassic Shangshaximiao Formation. Taking the Tiaotai copper deposit as an example, this paper summarizes and studies the geologic characters and metallogenic conditions of the copper deposits in Shangshaximiao Formation. The metallogenesis experienced three stages, i.e. 1) primary sedimentation of cupreous sandstone layer; 2) surface oxidation; and 3) secondary enrichment and mineralization. The deposit is formed by the groundwater leaching after the primary sedimentation of the cupreous sandstone layer.
2011 Vol. 20 (4): 282-286 [
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287
GENESIS OF THE COPPER-GOLD POLYMETALLIC DEPOSITS IN DAYAOSHAN OF GUANGXI, CHINA
DENG Jun
The copper and gold deposits in Dayaoshan area of Guangxi Region occur mainly in Cambrian strata. The CuAu mineralization is genetically related to the Caledonian and Yanshanian tectonomagmatic activities. Based on the results of previous geological survey and researches, the metallogenic conditions for the Cu-Au polymetal deposits related to hypabyssal and super-hypabyssal igneous rocks are analyzed from the view of sedimentary formation, magmatic rock, tectonomagmatic activity, ore-forming fluid, trace element and sulfur isotopic characteristics. It is concluded that the deposits in the area genetically belong to sedimentary enrichment-fault structure-hydrothermal overlapping reformation type. The metallogenesis underwent early stage of sedimentary enrichment, middle stage of magmatic hydrothermal overlapping mineralization and end stage of post-magmatic fault and hydrothermal reformation.
2011 Vol. 20 (4): 287-291 [
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APPLICATION OF EXPERT KRIGING ALGORITHM IN THE SPATIAL INTERPOLATION
LIU Shi-xiang, HU Yan-fei, YAN Qing-hua, MA Jin-ping, JIN Xin
Kriging algorithm is a method for estimating geological features in a certain area. However, this kind of estimation is not an intelligent one. Thus, the result cannot show the heterogeneous characteristics of the estimated area. To solve the problem, the authors put forward the Expert Kriging Interpolation Method, which applies experts' geological knowledge in kriging interpolation, so that the result meets actual geological conditions. The theories and models of the Expert Kriging are described in detail. The effectiveness of such method is verified by case study.
2011 Vol. 20 (4): 292-294 [
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QUANTITATIVE EVALUATION FOR MINERAL RESOURCES UTILIZATION: A case study of the iron resources in Liaoning Province
ZHANG Hong-mei, PAN Jin-hua, WANG Zong-he, DING Yong-bing, XIANG Cai, CHENG Guo-xia
In order to economically and intensively utilize the mineral resources in a particular area, it is necessary to evaluate the utilization level for some minerals to study the main problems, analysis the general situation and early warn the new trends. Adopting the multi-level and multi-index evaluation method, with the construction of the mineral resources utilization evaluation system, 16 kinds of main minerals of Liaoning Province are analyzed for the data of continuous 5 years. Taking the iron resources as example, the overall utilization is evaluated in detail. The evaluation results basically accord with the actual situation of each kind of mineral resources and their utilization levels, proving that the evaluation system is practical and universal.
2011 Vol. 20 (4): 295-300 [
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THE INDEX OF LOOSE DRY DENSITY IN THE EVALUATION TO CLAYEY DIATOMACEOUS EARTH DEPOSIT
GAO You-ku, LANG Ya-qin
The ore from the Gaosongshu deposit in Dunhua City, Jinlin Province is diatomaceous earth of poor quality with clayey minerals and fragments. Analysis on the samples from the deposit shows that, as the chemical compositions of the wallrocks, interbeds and ores are almost same, the regular industrial indexes cannot distinguish ore from rocks. In order to evaluate the deposit accurately, we add loose dry density to the basic testing items for the samples. After repeated tests, the loose dry density ≤ 0.95 g/cm
3
is determined as one of the industrial indexes, which successfully solves the problem of orebody delineation and ore quality evaluation.
2011 Vol. 20 (4): 301-303 [
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GOLD DEPOSIT IN THE LOWER SILURIAN BLACK ROCK SERIES IN NORTHERN SHIQUAN-HANYIN, SHAANXI PROVINCE
LIU Lin, WU Jing-ping, YANG Yi, YANG Xu-zhou
The gold deposit belt of black rock series of Lower Silurian Meiziya Formation in Northern Shiquan-Hanyin is tectonically located in the north margin of Niushan Old Land in the west of South Qinling Orogenic Belt. The ore belt is about 100 km long in E-W direction and 10-50 km wide in S-N direction. The early exploration has ascertained that the Lower Silurian Meiziya Formation was the ore-bearing layer of the gold deposits in this region. Based on the lithological assemblage characteristics, it is divided into six lithologic members and four ore-bearing sub-layers. More than ten gold deposits have been found in this ore belt. The gold deposits in this belt, controlled by stratigraphic, lithologic, paleogeographic and paleo-structural conditions, are homologous with the black rock series. The gold occurs mainly in particles and is unevenly distributed. The isotopic data show that the sulfur was originated from the strata. The characteristics of hydrogen and oxygen isotopes indicate that the aqueous media of the ore-forming fluid are mixed water containing mainly metamorphic-hydrothermal solution and atmospheric precipitation. The REE features reveal that the material source of gold deposits is similar to the Devonian sedimentary rocks in Qinba area. Ductile shear zone is not the necessary indicator for the existence of gold orebodies. Therefore, the gold ore in Meiziya Formation is a kind of sedimentary deposit.
2011 Vol. 20 (4): 304-309 [
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THE CHARACTERISTICS OF THE GOLD DEPOSITS IN MONGONON AREA, MYANMAR
GUO Ze-jun, DING Shi-chun, GUO Bin
The Mongonon area of Myanmar borders on Yunnan Province of China by a river. The geologic and structural characteristics of Mongonon area resemble to those in the neighboring area of Yunnan, with well correlated stratigraphy. The gold deposits in the area are of mainly structural-altered rock type. The orebodies, strictly controlled by structures, occur within faults in the NE-trending ductile shear zone, appearing in groups of lens in the surface. Numerous gold deposits and mineralized bodies are formed in the large-scale ductile shear zone, which is 15 km long and 1 km wide in Myanmar and stretches to Menglian County, Yunnan, China.
2011 Vol. 20 (4): 310-311 [
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SEDIMENTARY STRATIGRAPHY AND MORPHOLOGY OF THE ANCIENT WRECK AREA IN HEZE, SHANDONG PROVINCE
HUANG Wen-feng, SUN Ming, FENG Chao-chen, GUO Shi-chun
The sedimentation stages in the ancient channel of Zhaowang River are obvious. During the early stage, the sedimentation is mainly medium-fine sand and silty sand, with shifting sedimentary rhythm. The sediments in the late stage are dominated by silty fine sand and silty sand. From the bottom of the sunken ship upward, two sediment sections can be recognized, namely, flood deposition and channel deposition, with grain sizes getting finer. Analysis for the profile of channel sedimentation shows horizontal swings. After the ship had collided to the point bar and sunken, the braided channels disappeared gradually, when the area near the wreck started to accept a stable channel deposition.
2011 Vol. 20 (4): 312-315 [
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GEOLOGICAL WORK IN THE PLANNING AND CONSTRUCTION OF BEIJING CITY
LI An-ning, ZHENG Gui-sen
Geological work has basic, perspective and exploratory meanings for national economic development and construction. Along with the increasing recognition and expanding application of geosciences, the geological work is more and more significant in urban planning and construction. During the building of "Humanistic Beijing, Sci-tech Beijing, Green Beijing" and "Globalized City", Beijing will more rely on the scientific supports from geological work. All kinds of plans and constructions should accord with scientific rules, which will ensure the construction of a world-level city fit for habitation with safe residence, good environment, developed economy and leading technology.
2011 Vol. 20 (4): 316-320 [
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