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2012 Vol.21 Issue.2,
Published 2012-04-30
181
GEOCHEMISTRY AND ITS GEOLOGICAL IMPLICATION OF THE PERMIAN GRANITE IN NUOMIN, DAXINGANLING REGION
LIANG Ke-wei, LI Cheng-lu, ZHANG Li-dong, XU Guo-zhan
The Nuomin area in Daxinganling is tectonically located in the east section of the Xingan-Mongolian orogenic belt, where large volumes of Permian granitic rocks, mainly monzogranite and moyite, are developed. Major element analysis shows high SiO
2
and alkali content, slightly high K
2
O content and low MgO and CaO contents. Trace element study demonstrates the enrichment of Rb, Th, K, Nd and Cs, and depletion of Ba, U, Nb, Sr, P and Ti. The samples are enriched in LREE and depleted in HREE, with apparent negative Eu anomalies, suggesting a high degree of fractionation. The granites generally belong to the high-K calc-alkaline series. Petrogeochemistry shows that the granites are quite similar to S-type granite. They are most likely resulted from the partial melting of homologous crust, probably derived from metamorphic greywacke and intermediate volcanic rocks. According to the discrimination diagrams of R1-R2, Rb-(Yb+ Nb) and Rb-(Yb+Ta), the granites are generated in the stage of post-collision after the collision between Xingan block and Songnen block.
2012 Vol. 21 (2): 181-187 [
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188
ZIRCON U-Pb AGE OF THE DACHAZI SYENOGRANITE IN DUOBAOSHAN AREA, HEILONGJIANG PROVINCE: Geological implication
DAI Yu, LIU Jiang-ling, LIU Xu-guang, WANG Jian-min
The geochronology with zircon SHRIMP U-Pb isotope of the Dachazi syenogranite, cropped in Duobaoshan area, Heilongjiang Province, is studied to find out its age and geological background. The result suggests that the zircon has significant zonal structure, with Th/U ratio of 0.41-0.99, which is a typical granitic magma-type zircon. Zircons in the syenogranite from 11 observation points are analyzed, obtaining the weighted average
206
Pb/
235
U age of 345±3 Ma (
n
=11, SMWD=0.99), which represents the crystallizing age of the syenogranite, showing the formation age of Early Carboniferous. The analysis on the major elements and geochemistry shows that the syenogranite belongs to high potassium calc-alkaline series, genetically as A-type granite.
2012 Vol. 21 (2): 188-193 [
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194
THE FORMING AGE AND TECTONIC ENVIRONMENT OF THE MAOYILETU ROCK BODY IN JARUD, INNER MONGOLIA
LI Xue-fei, ZHAO Qing-ying, WANG Xiao-zhi, ZHANG Le-tong, CHENG Li-ren, WANG Tian-wu
With study on its geological background, petrologic and mineralogical characteristics, geology, geochemistry and isotopic chronology, the structural environment and forming age of the Maoyiletu rock body are discussed. The geological and geochemical characteristics show the calc alkaline characteristics. According to the SHRIMP U-Pb isotope chronologic analysis result, the statistical weight average of
206
Pb/
238
U surface age is 147.97±0.95 Ma, which represents the emplacement age of the rock body, belongs to Late Jurassic period. Combined with the analysis on the evolution characteristics of regional geology, the quartz diorite was formed during the crustal uplifting after the plate collision.
2012 Vol. 21 (2): 194-199 [
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200
REVISION OF THE SERIBAYANAOBAO FORMATION IN THE NORTH OF JARUD QI, INNER MONGOLIA
WANG Tao, LU Yue-jun, ZHANG Pei-chun, ZHI Xue-gong
During the 1:50000 regional geological survey in Jarud Qi from 2006 to 2008, the Early Carboniferous fossil plant of Archaeocalamites sp. was obtained from the gray-black silty tuffaceous silicon-pelitic slate in the lower part of the formation. Its age had been originally considered as the Early Permian. Based on the stratigraphic correlation and paleontological characteristics, the formation that includes plant fossils of Archaeocalamites sp. is revised as Late DevonianEarly Carboniferous, and assigned to Seribayanaobao Formation.
2012 Vol. 21 (2): 200-204 [
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205
SEDIMENTARY CHARACTERISTICS OF THE SLOPE FAN IN THE SLOPE BREAK IN THE SOUTHERN SAG OF THE ULIASTAI DEPRESSION, INNER MONGOLIA
ZHAO Ying-bin, MA Li-xiang, XIE Cong-jiao, MA Kui-xiang, GUO Fa-jun
Slope fan sediment is of a kind of the gravity flows. It is also developed in continental fault basins. Some conglomerate bodies with heavy thickness, coarse grains and quickly changed facies occur in the slope break of the First Member of Tenger Formation in Uliastai Sag, Erlian Basin, Inner Mongolia. However, there is still much controversy about the exact origin of the conglomerate bodies and bewilderment about the size, spatial distribution, reservoir characteristics and formational model of oil pools. Based on the examination of cores, well logs, 3D seismic and petrographic data, it is concluded that the conglomerate bodies belong to slope fan formed by sediment gravity flow in the low-stand systems. With classifi cation of the slope fan in the studied area, the planar distribution of the slope fan deposits is analyzed. A sedimentary facies model of the studied area is set up. This research will be helpful to further exploration in lithologic oil pools in the area.
2012 Vol. 21 (2): 205-210 [
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211
GEOLOGIC CHARACTERISTICS AND PROSPECTING INDICATORS OF THE MENGENTAOLEGAI SILVER-LEAD-ZINC DEPOSIT IN INNER MONGOLIA
GAO You-ku, GAO Zhong-yu, GAO Zhong-qiang
The large scaled Mengentaolegai Ag-Pb-Zn deposit in Inner Mongolia occurs in the center of the Late Permian granite complex. The host structure is a group of E-W-trending brittle fault zones. The metallogenesis experienced four stages, forming 44 ore veins in three levels, including 9 main orebodies, 9 large branch orebodies and 26 small orebodies. The deposit shows an obvious vertical zonation of Zn orebody, Ag-Pb-Zn orebody and Ag-Pb orebody from bottom to top. The commercial minerals are sphalerite, galena, pyrargyrite, canfieldite and native silver. The useful elements are mainly Zn, Pb and Ag, with associated In, Cd, Ga, Cu, Sn and Au. It is believed that the genesis of the deposit belongs to fissure-filled mesothermal Ag-Pb-Zn polymetal type, with evident prospecting indicators.
2012 Vol. 21 (2): 211-215 [
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216
DIVISION OF METALLOGENIC SERIES AND DELINEATION OF PROSPECTIVE AREAS IN FUSHUN, LIAONING PROVINCE
REN Li-gou, ZHAO Peng, MA Yu-lai, WANG Xi-jun, XU Jing, LIU Ming-yu, ZHANG Hua-nan
Based on the characteristics of magmatism, metamorphism, sedimentation, structural conditions and ore-forming ages, as well as the characteristics of the deposits themselves, the deposits in Fushun, Liaoning Province are grouped into 3 metallogenic assemblages, with 11 metallogenic series. The complex metallogenic series are further divided into sub-series. The characteristics of metallogenesis and minerals of each series are discussed briefly. On the basis of metallogenesis of deposits, geophysical and geochemical anomalies and remote sensing information, 6 prospective areas of Grade V, with 17 sub-areas, are delineated. Au, Ag, Cu, Mo, Pb, Zn, Pt-Pd, Nb-Ta, Fe, limestone and coal bed gas are decided as the key minerals for prospecting. The prospecting direction is also pointed out.
2012 Vol. 21 (2): 216-222 [
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223
GEOLOGICAL CHARACTERISTICS OF THE NANFEN IRON DEPOSIT IN BENXI, LIAONING PROVINCE
BIAN Wei-yong, OU-YANG Zhao-zhuo, ZHANG Peng
The Nanfen iron deposit, genetically belonging to Archean volcanic sedimentary metamorphic deposit of Anshan type, is in super large scale, with simple orebody shape and evenly distributed useful components. The ore bodies are composed of three iron ore layers which are distributed in the Archean Anshan group. The ores are controlled by monoclinic structure, with stable scale, occurrence, mineral composition and grade of TFe.
2012 Vol. 21 (2): 223-228 [
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229
GEOCHEMISTRY AND PETROGENESIS OF THE LAMPROPHYRES RELATED TO GOLD DEPOSITS IN QIXIA, SHANDONG PROVINCE
GENG Rui, SUN Feng-yue, DING Zheng-jiang, HU Wei-hua
The lamprophyres in Qixia area, Shandong Province are always closely associated with gold mineralization. The lamprophyres in the studied area are mainly calc-alkalic spessartite, characterized by high alkali (K) and low Ti, with enrichment of LILEs and LREEs, and depletion of HFSEs and HREEs. Study shows that the lamprophyre should be originated from the partial melting of enriched mantle, which was formed by the metasomatism of fluid in the subduction belt. The magma, formed in island arc calc-alkalic environment, was not significantly mixed with the crustal material during its rising process. The formation of the lamprophyre is the joint effect of multiple dynamic factors.
2012 Vol. 21 (2): 229-233 [
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234
GEOLOGY AND GENESIS OF THE GUOGANG IRON DEPOSIT IN ZHENPING COUNTY, HENAN PROVINCE
LI Jun-feng, XU Gang, TANG Lei, ZHU Xue-han, JIANG Xiao-jiang, ZHANG Sai
The Guogang iron deposit, located in the east section of Southern Qinling fold belt, is a concealed deposit. Two discovered industrial iron orebodies, which are about 25 meters apart vertically, show layered and stratiform-like structures. The host rock is the Devonian Nanwan Formation. The main ore mineral is magnetite, with massive and banded structures. The iron deposit is strictly controlled by stratum. Geochemistry of the trace elements and REE indicates its basin deposition formed in active continental margin. The REE patterns imply that the ore-forming materials are from upper crust of North China plate. The Guogang iron deposit belongs to sedimentary-metamorphic type in genesis.
2012 Vol. 21 (2): 234-238 [
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239
CHARACTERISTICS AND ORIGIN OF THE LAOYACHAO CRYPTO-EXPLOSIVE BRECCIA IN SHUIKOUSHAN OREFIELD, HUNAN PROVINCE
CHENG Xiong-wei, TANG Jing-ru, DU Jin-liang, LUO Hong-bo
A series of breccia was formed during the overlap intrusion in the Laoyachao Pb-Zn-Au polymetallic deposit. The magma crypto-explosive breccia, which is the main host of the deposit, includes crypto-explosive breccia, shatter breccia and fluidized breccia. The Late Triassic-Middle Jurassic karst sedimentary bodies, with high porosity and containing groundwater, are widely spread in the ore field. When the magma intrusion took place, the external environment changes caused the reduction of pressure and temperature, with re-boiling of magma and constant exhalation of fluid. In locally closed environment, the fluid pressure gradually increased. With rich groundwater in the karst rocks, continuous gasification of the groundwater resulted in rapid increase of gas pressure. In the well confined area by the overlap, explosion took place, forming crypto-explosive breccia. In the external zone of the explosion, shatter breccia was formed. The fluidization after the explosion, then, formed the fluidized breccia. Based on the study of the characteristics of the cryptoexplosive breccia in the Laoyachao Pb-Zn-Au polymetallic deposit, with the rock formation, structure and intrusive rocks, the forming process of the crypto-explosive breccia is discussed. The analysis on the relationship between the lead-zinc-gold ore bodies and the crypto-explosive breccia will be helpful for further prospecting in the mining area.
2012 Vol. 21 (2): 239-243 [
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244
THE MONITORING SYSTEM AND TECHNOLOGIES OF LAND SUBSIDENCE IN BEIJING
LIU Ming-kun, JIA San-man, CHU Hong-liang
The Beijing Land Subsidence Monitoring System consists of land subsidence monitoring network, leveling monitoring network, GPS monitoring network, groundwater dynamic monitoring network and InSAR monitoring network. Based on the information accumulated through the land subsidence monitoring work of Beijing City in recent years, this article analyses and summarizes the bedrock bench mark and layered bench mark monitoring and quality control method. The two-level monitoring method, i.e. GPS monitoring control network and monitoring network, improves the monitoring accuracy. The InSAR method is adopted to initiate the land subsidence special monitoring research on some important rail traffic. The article also gives some guidance for land subsidence monitoring network construction and optimization.
2012 Vol. 21 (2): 244-249 [
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250
EXTRACTION AND ANALYSIS OF GEOGRAPHICAL CHARACTERISTIC INFORMATION BASED ON REMOTE SENSING IMAGE: A case study of Huize area, Yunnan Province
XING Jing-lei, ZHU Jie-yong, WANG Lei
Taking Huize area of Yunnan Province as an example, on the basis of remote sensing image of ETM+, ASTER and DEM, this paper applies the ARCGIS and ERDAS to extract the geographic information of vegetation, terrain and slope, and generate thematic maps for the study of agricultural planning, soil erosion, geological disasters, resources development and soil erosion.
2012 Vol. 21 (2): 250-255 [
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256
THE DIGITAL GEOLOGICAL MAPPING ACHIEVEMENT SPATIAL DATABASE: Characteristics and examination
KANG Zhuang, WANG Yong-li, MAO Chao-xia
Building a spatial database is vital to the general technical process of the digital geological achievement data. Based on the analysis on the characteristics of spatial database, the method of examination is proposed, which offers a technical guarantee for the building of spatial database and the quality control of data and also effectively improves the ability of application and efficiency of spatial database building.
2012 Vol. 21 (2): 256-260 [
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