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2016 Vol.25 Issue.3,
Published 2016-06-30
213
SEQUENCE STRATIGRAPHY OF JIUJUZI FORMATION IN FENGSHOU AREA OF AOHAN QI, INNER MONGOLIA
LIU Miao, LI Wei, CHEN Jing-sheng, LI Bin
Carboniferous strata are well developed in Fengshou area of Aohan Qi, Inner Mongolia. The Upper Carboniferous Jiujuzi Formation, composed of a set of terrigenous clastic rocks, is specific in the region. Based on the rock assemblage, fabrics and vertical variation regular pattern, one sequence of third-order is recognized, including two sequences of forthorder and five sequences of fifth-order(high frequency cyclic sequence).
2016 Vol. 25 (3): 213-217 [
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SEQUENCE STRATIGRAPHY OF THE FIRST MEMBER OF GEGENAOBAO FORMATION IN ZHALANTUN AREA, INNER MONGOLIA
WU Tong, LI Wei, SI Qiu-liang, TANG Zhen, MA Yong-fei
A set of normal terrigenous clastic sedimentary rocks of the first member of Gegenaobao Formation, Upper Carboniferous-Lower Permian, is well developed in Zhalatun area, Inner Mongolia. Base on the analysis of the rock assemblage, composition, vertical variation of strata and sedimentary environment change, the sedimentary rocks of Gegenaobao Formation may be subdivided into one Grade Ⅱ sequence, including three Grade Ⅲ sequences and seven Grade IV sequences. Study on the sequence stratigraphy provides a valuable reference for the Late Paleozoic sedimentary basin formation in Daxinganling region.
2016 Vol. 25 (3): 218-222 [
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223
SOME VIEWPOINTS ABOUT THE YALUJIANG MAJOR FAULT ZONE IN LYUJIANGCUN AREA, LIAONING PROVINCE
PAN Ming-chen
The Yalujiang fault zone is a branch the Tan-Lu giant fault zone, which crosses eastern China. Its dynamic mechanism is the collision between the Pacific plate and Eurasian plate during Yanshanian period. The shearing movement forms a series of NE-trending sinistral crustal fractures, in depth about 4 km, with maximal left displacement more than 20 km. The geological structural characteristics on both sides of the major fault are comparable.
2016 Vol. 25 (3): 223-226 [
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227
DISCOVERY AND GEOLOGICAL SIGNIFICANCE OF ADAKITIC ROCKS IN THE LATE PALEOZOIC GEGENAOBAO FORMATION IN ZHALANTUN AREA, MIDDLE DAXINGANLING MOUNTAINS
ZHANG Yu-jin, WU Xin-wei, YANG Ya-jun, CUI Tian-ri, JIANG Bin, GUO Wei, ZHANG Chao, QIANG Cheng, CHEN Hui-jun, LI Wei, LI Lin-chuan, SI Qiu-liang
The Late Paleozoic adakites in Zhalantun area in the middle section of Daxinganling Mountains are composed of mainly andesite, trachyandesite, dacite and trachydacite. One of the andesite samples yields the zircon U-Pb age of (316.9±2.4) Ma by LA-ICP-MS, which represents the eruption age. The andesite has a high Si (54.97%-63.80%) and alkali content, with relatively high Na(Na
2
O/K
2
O>1). Besides, high Al(Al
2
O
3
=14.97%-17.69%) and Sr(715.98×10
-6
-2100×10
-6
)and low Y (12×10
-6
-18.41×10
-6
)and Yb (1.02×10
-6
-1.91×10
-6
)are also shown in this sample. The primitive mantle-normalized spider diagram of the andesite shows enriched LREE and depleted HREE, with slight positive Eu anomaly. The Mg
#
values range from 0.35 to 0.57, averagely 0.46. Generally speaking, this andesite belongs to the high-K calc-alkaline adakite (C-type adakite), which should originate from the partial melting of thickened basaltic lower crust. The discovery of this high-K calc-alkaline adakite in Zhalantun area provides a new clue for the amalgamation of Xinganling and Songnen massifs, which has a tectonic significance for understanding the regional crustal evolution, and therefore is useful for locating the mineral deposits related to adakite.
2016 Vol. 25 (3): 227-236 [
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237
THE U-Pb CHRONOLOGICAL EVIDENCE FOR THE VOLCANIC ROCKS OF TANGJIATUN FORMATION IN EAST HARBIN, HEILONGJIANG PROVINCE
WANG Xing, ZHENG Tao, GU Hua-juan, NIU Yan-hong, LIANG Cheng-zhe
The Tangjiatun Formation, dominated by strong schisteous acidic and acidic-intermediate volcanic rocks, with minor intermediate volcanic rocks and metamorphosed normal sedimentary rocks, are widely exposed in East Harbin, Heilongjiang province. The volcanic rocks contain SiO
2
of 61.50%-68.96%, TiO
2
of 0.61%-0.88%, Fe
2
O
3
of 1.21%-4.24%, MgO of 0.30%-2.08% and CaO of 0.77%-4.57%, with Mg
#
of 4-25, Al
2
O
3
=15.12%-16.99%, K
2
O=2.68%-5.2%. The alkaline content is rich, with Na
2
O/K
2
O=0.94-2.18, Na
2
O + K
2
O=7.05%-9.99%. The total REE contents are 140.81×10
-6
-276.36×10
-6
, with LREE/HREE ratio of 7.72-9.70. The rocks are enriched in LREE but depleted in HREE, with δEu=0.77-1.03, i.e. negative anomaly to slightly positive anomaly. The mode of REE patterns shows right-inclined curves. The trace elements of the rocks are rich with LILEs (Zr and Ba) and depleted with HFSEs (Nb, Ta and Ti), Sr and P, showing the characteristics of bimodal volcanic rocks. The LA-ICP-MS U-Pb dating result of the volcanic rocks yields the weighted average age of 300±1 Ma, indicating the forming age of Late Carboniferous Epoch, which was an extensional environment.
2016 Vol. 25 (3): 237-243 [
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244
GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS OF THE ZHENGGUANG GOLD DEPOSIT IN HEILONGJIANG PROVINCE
WANG Bao-quan
The Zhengguang gold deposit in Heilongjiang Province is of epithermal magmatic type. The orebodies are distributed near the diorite and dioritic porphyrite and the internal or external contact zone. The ore-host structures are the NNE-,NNW-,NEE- and NE-trending structural fracture belts. Based on the study of orefield geology,deposit characteristics and metallogenic regularity, the prospecting indicators are summarized.
2016 Vol. 25 (3): 244-249,253 [
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70
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250
GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS OF THE QUANJIANCHONG SILVER POLYMETALLIC DEPOSIT IN ANHUI PROVINCE
YANG Jing-ming, LUO Hong-bo, NIE Zhang-xing, SHEN Huan-xi
The Quanjianchong silver polymetallic deposit is located in the Huangmei-Huaining mineralization region within the Cu-Fe (polymetallic) metallogenic belt along the middle and lower reaches of Yangtze River. The diapiric invasion-extension-gliding structure formed by the Hongzhen granite intrusion into the core of Dongling anticline constitutes the basic structural framework of this region. The Ag-Pb-Zn polymetallic deposits that are related to tectonics and magmatic hydrothermal process are broadly developed in the area. With study on the geological characteristics and prospecting indicators of the silver polymetallic deposits in the orefield, it is concluded that the interfaces between the carbonaceous siliceous slates and carbonate rocks are advantageous metallogenic positions. Severe magmatism provides a large number of ore-bearing hydrothermal solutions for mineralization. The NE-trending detachment structures in the area serve as the ore-guiding and hosting structures. Special structural positions are important occurrences for silver polymetallic ore enrichment.
2016 Vol. 25 (3): 250-253 [
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254
GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL IMPLICATION OF THE BAIYINNUOER Pb-Zn DEPOSIT IN INNER MONGOLIA
YANG Fan, WANG Yan, FU Jun-yu, NA Fu-chao, ZHANG Guang-yu, SUN Wei, SHI Yi, ZHANG Li
The Baiyinnuoer Pb-Zn deposit in Inner Mongolia is a typical skarn type deposit. However, there is little research concerned with geochemistry and metallogenic dynamics of the ore-forming body. The granitoid rocks that related to mineralization are studied in this article. The results show that the granitoids are high-K calc-alkaline series with enriched LREE and large-ion lithophile elements(LILE) and depleted high field strength elements(HFSE). The origin of magma is the enriched mantle. The mineralization occurred in the post-orogenic extension environment.
2016 Vol. 25 (3): 254-260 [
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53
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261
CHARACTERISTICS OF TYPICAL LEAD-ZINC DEPOSITS IN LIAONING PROVINCE
LI Wei
Based on the potential assessment for the mineral resources in Liaoning Province and the previous research results, the Pb-Zn deposits in Liaoning are classified into eight genetic types. The representative deposits of each type are deeply analyzed in the terms of stratigraphy, magmatite, structure, metallogenic epoch, tectonic settings and ore characteristics.
2016 Vol. 25 (3): 261-264 [
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265
GEOLOGICAL CHARACTERISTICS OF THE DALAIHE IRON DEPOSIT IN QINGYUAN COUNTY, LIAONING PROVINCE
XIE Zhong
The Dalaihe iron deposit, located in Qingyuan County, Liaoning Province, belongs to Anshan type of sedimentary-metamorphic reconstruction. The orebody is buried from 0 to 170 m deep, extending 410 m long. Surface trenching reveals the largest width of 20 m. The orebody, generally in lenticular shape, is inclined to northwest, with little horse. The direct wallrocks of orebody are amphibolite and magnetite amphibolite. The indirect surrounding rock is biotite plagiogneiss. The ore type is simply magnetite quartzite. The grade of ore is even. Preliminarily estimated resources are more than 3 000 000 t.
2016 Vol. 25 (3): 265-268 [
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269
PRELIMINARY STUDY ON THE PROSPECTING POTENTIAL OF NIOBIUM-TANTALUM DEPOSITS IN DAXINGANLING REGION
MAO Zhao-xia, ZHENG Chang-qing, BI Zhong-wei, YANG Ya-jun, CHAI Lu, ZHANG Chun-peng
Kinds of intrusive and volcanic rocks, including alkaline and calc-alkaline rocks with metallogenic conditions for niobium and tantalum deposits, are developed in Daxinganling region. However, the prospecting work is generally poor. Large area of Nb geochemical anomaly shows a good prospecting potential. Based on the discussion of regional geology and characteristics of the ore deposits in Daxinganling area, the ore prospects in this area is preliminarily analyzed. The technical method of prospecting is also proposed.
2016 Vol. 25 (3): 269-274 [
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275
GEOCHEMICAL CHARACTERISTICS AND MINERALIZATION SIGNIFICANCE OF THE TAOXIKENG GRANITE IN SOUTHERN JIANGXI PROVINCE, CHINA
CAI Yun-hua, CAI Yong-feng
Geochemical analyses are carried out on the Taoxikeng granite which is closely related to the economically important Taoxikeng tungsten deposit in Southern Jiangxi Province, South China. The results show that the Taoxikeng granites are characterized by high silicon and aluminum contents and low titanium content. The granites show strong depletion of Eu, Sr and Ba, and enrichment of Th and U. These geochemical characteristics resemble to those of A-type granite, showing well mineralization of tungsten. Combined with the regional data, the authors propose that granitic magmatism played an important role during tungsten mineralization, which provides ore-forming material source for the mineralization and further leads to the formation of Taoxikeng tungsten deposit.
2016 Vol. 25 (3): 275-280 [
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281
FEATURES AND ASSESSMENT OF OIL SAND IN SHALLOW HEAVY OIL RESERVOIRS
WU Zhao-hui, WU Ying-hao, GUO Jin-hui, ZHAI Lin-xiu, WU Ying-xin, XU Shou-yu
Oil sand and shallow heavy oil are low-cost unconventional resources, which greatly impact the oil prices. In Chunfeng Oilfield, which is the combination of both kind resources, the rich oil sand in shallow reservoirs is loose due to weak compaction. Therefore, it is difficult to carry out some routine experiments, such as physical properties and oil saturation. Beside conventional tests, some new experiments are necessary for these unconventional resources, i.e. thermal properties, high-temperature permeability analysis, NMR saturation test, etc. Thermal experiments show that both muddy and limy interlayers in reservoirs are usually high thermal conductivity, indicating a high thermal efficiency during development. Phase permeability experiment, which reflects pore sizes and connectivity, shows great difference between the ending values of Kro and Krw, with a wide range of 2-phase covers and low irreducible water saturation. The evener the pore sizes are, the higher the oil phase relative permeability is. NMR can directly obtain the value of Swi and original oil saturation, and then calculate the oil displacement efficiency. The potential assessment result shows that after many rounds of steam stimulation, the inter-well oil saturation is still high, which reflects the low oil displacement efficiency, suggesting a great potential of the oil sand.
2016 Vol. 25 (3): 281-286 [
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287
APPLICATION STATUS AND DEVELOPMENT OF THE MICROBIAL PROSPECTION FOR OIL AND GAS
MA Jian-sheng
Microbial prospection for oil and gas (MPOG) is a comprehensive application to find the anomaly by the physiological and biochemical characteristics of the specific microorganisms in the surface soil. Up to now, both China and abroad have seen the successful examples to delineate abnormal areas with this method, showing that MPOG can be used as the conventional means to prospect oil and gas. This paper mainly summarizes the principles, technical methods, as well as the research status and developing direction of MPOG.
2016 Vol. 25 (3): 287-290 [
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291
ANALYSIS ON MANAGEMENT SYSTEM OF CHINA'S SHALE GAS RESOURCES BASED ON PERFECT COMPETITION MODEL
WU Kan, YANG Shu-wang
Shale gas is a kind of energy resources relatively clean and efficient. The shale gas revolution in the United States can be regarded as the most influential energy revolution of this century, which helped them achieved the aspirational "energy independence". By the American experience, the shale gas revolution is the results of emancipated mind and open market. It is the successful practice of the completely competitive market model theory applied in the shale gas industry. The technically recoverable shale gas reserves in China are the largest in the world. However, due to the restriction of management system and other reasons on shale gas exploitation, the exploration breakthroughs in China are only in individual blocks at present. There is still a long way to large-scale commercial exploitation of shale gas. With a deep analysis on the management system of the shale gas resources, this paper summarizes and discusses the disadvantages of traditional oil and gas management system, as well as the inspiration of shale gas development in the United States. Applying western classical economics theory of perfect competition model, suggestions are proposed for the reformation of shale gas resources management system and related policies.
2016 Vol. 25 (3): 291-297 [
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298
PHASE ANALYSIS METHOD FOR BORON MINERALS FROM WENGQUANGOU
WANG Hai-jiao, HE Lian, YANG Liu
Based on the analysis of four samples of ore collected from Wengquangou boron deposit in Liaoning Province, it is concluded that the ore is composed of mainly szaibelyite and ludwigite. In the phase analysis, boron in ludwigite is detected by wet magnetic separation and acid digestion. The remnant digested in acid is used to determine boron in szaibelyite. The result shows that the component tested by this method is in accordance with the ore-forming geological composition. The phase analysis for boron ores and boron minerals in nature is rapid and accurate. It provides a new approach to the study and test of boron ores.
2016 Vol. 25 (3): 298-300 [
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DEVELOPMENT AND CONSTRUCTION OF VIRTUAL THREE-DIMENSIONAL PLATFORM FOR MINERAL DEPOSITS
HAN Xiu-mei, ZHAO Qing-yin, ZHANG Jian-min
Adopting network, database and VR technologies, this research develops a comprehensive database of typical deposits and three-dimensional dynamic simulation modules of typical deposits, which move typical geological model to network. The research, relying on the virtual simulation project of Jilin University, designs and develops a Web-based simulation system for virtual deposits. The main function of the simulation demonstration is to realize the dynamic show of the ideal metallogenic mode process, providing people more direct understanding of the geological meaning. Users can study the huge amount of data of typical deposits from the network. The system has changed the traditional way of information visibility and geological information management of ore deposits.
2016 Vol. 25 (3): 301-304 [
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305
DISCUSSION ON THE METAMORPHIC STAGE AND P-T-t PATH OF LIAOHE GROUP
LIANG You-wei, GUO Hong-fang
In some literatures, the mineral assemblages of different metamorphic grades of Liaohe Group are regarded as the mineral assemblages of different stages. Actually, they are the results of different sites, times and phases. They just coexist spatially, but not temporally. The pressure-temperature condition curves of mineral associations of different metamorphic grades should not be served as the P-T-t paths. In fact, this kind of curves is field metamorphic gradient, which intersects the P-T-t path with large angle. Therefore it is inappropriate to discuss the metamorphism evolution of Liaohe Group with field metamorphic gradient instead of P-T-t path.
2016 Vol. 25 (3): 305-308 [
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