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2014 Vol.23 Issue.5,
Published 2014-10-31
419
GEOCHEMISTRY AND ITS GEOLOGICAL IMPLICATION OF THE DA'ANHE DEPOSIT AND ORE-FORMING ROCKS IN HEILONGJIANG PROVINCE
YANG Fan, SUN Jing-gui, FU Jun-yu
The Da'anhe gold deposit in Heilongjiang Province is a typical skarn deposit. However, there was rare research on geochemistry and metallogenic dynamics of the ore-forming rock mass of the deposit previously. This study focuses on the gabbro that is closely related to mineralization. The result shows that the gabbro is Al-rich rock, with enrichment of large-ion lithophile elements(LILE)and depletion of high field strength elements(HFSE). The origin of magma is the mixture of main enriched mantle and continental crust. The diagenetic-mineralization mechanism is closely related to the amalgamation of Jiamusi and Songnen massifs and the subduction of Jurassic Pacific Plate.
2014 Vol. 23 (5): 419-423,449 [
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424
GEOLOGY AND PROSPECTING INDICATORS OF DUJIAHE GOLD DEPOSIT IN LUOBEI COUNTY, HEILONGJIANG PROVINCE
ZHANG Peng, XING Li-ping, NIE Xi-tao, PENG Ming-sheng, CUI Pei-long
The Dujiahe gold deposit, occurring in the Mesoproterozoic Heilongjiang group, is controlled by antiform structures. Based on detailed field geological survey, the paper studies the geological characteristics, structure and texture of ores and mineralogical characteristics of gold. The results show that the ores are crystalline and idiomorphic granular in textures, with dense massive and disseminated structures. The wall rock alterations include sericitization, silicification and pyritization. The genetic type belongs to ductile-shear-zone-related gold deposit. The prospecting indicators such as strata, structure and alteration are also pointed out, which provides theoretical basis for prospecting in the area.
2014 Vol. 23 (5): 424-428 [
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52
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429
Pseudoctenis
DISCOVERED FROM THE LOWER JURASSIC HONGQI FORMATION IN JILIN PROVINCE
YANG Jia-lin, SONG Wei-min, YANG Ya-jun, PANG Xue-jiao, TAO Nan, DU Ji-yu, ZHENG Shao-lin, ZHANG Yi
The Lower Jurassic Hongqi Formation, distributed mainly in Wanbao Basin of the southeastern Daxinganling Mountains in Taonan, Jilin Province, is predominately composed of coal-bearing clastic sedimentary rocks, overlying the tuffs of the Middle Permian Dashizai Formation with unconformity, and in turn overlain disconformably by the basal conglomerates of the Middle Jurassic Wanbao Formation, representing lacustrine and swamp facies developed on a local intermontane fault basin. In 1982, Yang Xuelin and Sun Liwen first reported fossil flora with occasional occurrence of Cycadophytes from Hongqi Formation. Recently, several fossil leaves of
Pseudoctenis eathiensis
, associated with
Phoenicopsis
and
Anomozamites
, etc. were discovered from Hongqi Formation. Although
Neocalamites
,
Cladophlebis
,
Pseudoctenis
,
Anomozamites
,
Czekanowskia
,
Podozamites
and
Pityophyllum
are comparable with the Early Jurassic fossil plants from the northeastern border of Qaidam Basin in Qinghai,
Cycadophytes
including
Pseudoctenis
and
Anomozamites
are actually not abundant, indicating that the characteristics of Continental Floristic Province under the control of warm temperate to "paratropical" climate are quite different from those of Maritime Floristic Province under the control of tropical climate, which is characterized by abundant Cycadophytes.
2014 Vol. 23 (5): 429-434 [
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435
GEOLOGICAL CHARACTERISTICS AND METALLOGENIC REGULARITIES OF THE XILINHE SILVER DEPOSIT IN JILIN PROVINCE
LI Zhu-tai, ZHANG Hong-xue
The recently discovered Xilinhe epithermal silver deposit in Fusong, Eastern Jilin Province occurs in the contact zone between the Archean granite and Proterozoic marble. The deposit is located within the ductile shear zone in the most northeast of Longgang fault block, with vein-type orebodies controlled by the ductile faults. The ores are in hedral-subhedral texture, granular texture, inclusion texture, filling texture, crushing texture, internal cleavage texture, droplet texture and erosion texture, with veinlet structure, disseminated structure, massive structure and brecciated structure. The metal minerals in the ore include argentite, dyscrasite, silver, pyrite, galena, sphalerite, chalcopyrite, tetrahedrite, covellite, stibnite, etc., with nonmetallic minerals of quartz, sericite, calcite, chlorite, etc. The genetic type of the deposit belongs to post-magmatic epi-mesothermal filling silver deposit. The major ore-controlling factors are structure, lithological strata and magmatic rocks.
2014 Vol. 23 (5): 435-439 [
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30
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440
GEOCHEMISTRY AND TECTONIC ENVIRONMENT OF THE GUANMENSHNA INTRUSIVE ROCKS IN BENXI AREA, LIAONING PROVINCE
SHI Shao-shan, YOU Hong-xi, CHENG Long, WEI Ming-hui, SONG Yun-hong, YAO Yuan, WANG Yu-li
The major elements and trace elements of the Guanmenshan syenogranite in Benxi area, Liaoning Province are studied. The characteristics of the major elements show that the syenogranite belongs to high-K calcium-alkaline series. The seagull-shaped chondrite-normalized REE distribution patterns suggest enrichment of LREEs and depletion of HREEs, with medium negative Eu anomalies. Trace element spider diagram shows that the rocks are enriched in large ion lithophile elements (LILEs, such as Rb, Th and K), whereas depleted in high field strength elements (HFSEs, such as Ta, P and Ti). The composition of trace elements in syenogranite indicates that the formation pressure of granite magma is less than 1.0 GPa, and the source materials exist in the depth of 30-40 km of the earth crust, belonging to thinned crust. The syeogranite was formed in the Early Cretaceous when the Liaodong block was in intracontinental extension environment.
2014 Vol. 23 (5): 440-445 [
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45
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446
GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTION OF THE WANBAOCUN CU-AU-MO DEPOSIT IN KUANDIAN, LIAONING PROVINCE
SUN Wu-guo, LIU Bing, LIAN Tao
The Wanbaocun Cu-Au-Mo deposit in Kuandian County, Liaoning Province, located in the contact zone between the Yanshanian Shizhuzi granodiorite and Cambrian carbonate rock, is jointly controlled by NE- and NW-trending faults. The ore bodies lie in the NW-trending structural belt in en echelon arrangement. The NW structure controls the emplacement of Shizhuzi granodiorite, as well as the formation and distribution of skarn orebodies. It is significant for further prospecting to recover the structural features in the skarn area, especially the buried early structural belts that controlled the magma intrusion.
2014 Vol. 23 (5): 446-449 [
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41
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450
STUDY ON THE HISTORY OF LAND SUBSIDENCE IN LOWER LIAOHE RIVER PLAIN
SUN Qi-fa, TIAN Hui, ZHANG Kuo
The ground subsidence in Lower Liaohe River Plain, which results in the degradation of wetlands, has seriously impacted on not only the local economy, but also the ecological environment. Without a monitoring network, the scopes and sizes of the subsidence in this region are not clearly known. In order to find out the historical land subsidence in Lower Liaohe Plain so as to effectively improve the local economy and environment, the terrain map matching method is put forward. By collection of topographic maps of different periods, the elevations for the same spots are compared. The result shows that the land subsidence does exist in and around the concentrated areas of the oil fields and the groundwater exploitation, with maximum subduction up to 3 m. The topographic map matching effectively solves the problems of determination of scope and magnitude of subduction in the Lower Liaohe Plain. It is a practicable method to know the subsidence situation without the network monitoring data.
2014 Vol. 23 (5): 450-452 [
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121
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453
PRELIMINARY STUDY ON THE GEOLOGY AND GENESIS OF THE JILINBAOLIGE SILVER POLYMETALLIC DEPOSIT IN INNER MONGOLIA
CONG Run-xiang, CHANG Chun-jiao, LIU Gui-ge, QI Li-hua, WANG Zhi-hua, WANG Liang, ZHANG Hui-yu
The Jilinbaolige silver polymetallic deposit in Dong Ujimqin Qi, Inner Mongolia, is tectonically located in the east of Early Paleozoic Chaganaobao-Aoyoute-Chaobuleng tectonic-magmatic belt on the southeastern margin of Siberian plate. The Upper Devonian Angeryinwula Formation is the main host stratum closely related to the silver polymetallic mineralization. The Jilinbaolige stock outcropping in the orefield, mainly composed of porphyritic monzogranite, is the supplier of ore-forming minerals. Fault structures are developed in the area, with NE striking tensional and E-W striking compressive fractures controlling the distribution of most silver polymetallic orebodies. With study on sulfur and lead isotope characteristics in Jilinbaolige silver polymetallic deposit, it is found that the sulfur in the silver polymetallic ores might come from the mixing and balancing effect of sediment sulfur and mantle or magma sulfur. The lead is mainly derived from the mantle and closely connected with the monzogranite outcropped in the orefield. Based on the comprehensive analysis on the geological and geochemical characteristics of the deposit, combined with study on regional tectonic evolution, it is concluded that the Jilinbaolige silver polymetallic deposit is related to the Variscan acidic -intermediate magmatic hydrothermal activities.
2014 Vol. 23 (5): 453-460 [
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461
ORE-FORMING GEOLOGICAL CONDITIONS AND ORE PROSPECTS OF THE GOLD AND POLYMETALLIC DEPOSITS IN THE PENGBOSHAN AREA, INNER MONGOLIA
LIU Deng-feng, LIANG Li-chun, HAN Tian-cheng, WANG Lei, YAN He-long
Pengboshan area is an important gold and polymetallic metallogenic belt in Northwest China, where gold and polymetallic mineralization is controlled by strata, structures and magmatism. Analysis shows that the Paleoproterozoic Beishan Group, Middle Ordovician Xianshuihu Formation, Lower Carboniferous Baishan Formation and Lower Permian Shuangbaotang Formation have favorable geochemical conditions for the forming of gold, silver, lead (zinc), tungsten and other minerals. The spatial distribution of the gold and polymetallic deposits is obviously related to that of the acidicintermediate intrusive rocks in this area. The mineralization time is consistent with the Late Paleozoic magmatism. The NWNE trending faults control the occurrence of the deposits. Accordingly, the direction for future exploration in the area is pointed out.
2014 Vol. 23 (5): 461-464 [
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38
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465
METALLOGENIC REGULARITIES OF THE PALEOZOIC CONTINENTAL VOLCANIC-SUBVOLCANIC GOLD DEPOSITS IN XINJIANG
TAN Wen-juan, YANG He-qun, FENG Jing, JIANG Han-bing, YANG Zai-feng, DONG Fu-chen, XIAO Chao-yang
The Paleozoic continental volcanic rock-type of gold deposits in Xinjiang presents in three styles as follows. The Axi style, located in the west section of Boluokenu in Western Tianshan, was formed in Late Devonian. The Shiyingtan style, distributed in the Jueluotage belt, Eastern Tianshan, was formed in Early Permian. The Mazhuangshan style in the northern margin of the Tarim block was formed in Late Carboniferous. Analysis on the ore-forming conditions, metallogenic process and genesis shows that the mineralization ages are almost the same to, or a little later than, those of the ore-bearing formations. The deposits are assigned to continental volcanic-subvolcanic para-syngenetic Au-Ag metallogenic series.
2014 Vol. 23 (5): 465-469,475 [
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49
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470
HETEROGENEITY OF DEVONIAN RESERVOIR AND ITS MAJOR CONTROLLING FACTORS IN BACHU-MAIGAITI AREA, TARIM BASIN
SUN Shou-liang, SU Fei, GUO Wei, LI Yong-fei
Bachu-Maigaiti area in Tarim Basin is well known for accumulation of oil and gas, where oil and gas have been found in many wells in the Devonian reservoir. However, the uncertainty of forming conditions of favorable reservoir and distribution regularity hinders further exploration and development in the area. With observation of drilling cores, rock slices and casting thin sections of eight wells, combining with intrusive mercury analysis and porosity and permeability test, the authors study pore characteristics and non-homogeneity of the Devonian reservoir in the area. The results show that the main sand pore type is intergranular dissolution pore, followed by primary intergranular pore, with structural characteristics of fine pore, fine throat and poor sorting. In addition, quantitative parameters such as sandstone density and permeability variation coefficient show a strong heterogeneity between and within the layers of the Devonian reservoir in the study area. The degrees of heterogeneity are mainly controlled by genetic types of sandbody and diagenesis. The early oil and gas filling has only an indirect controlling effect on part of the area.
2014 Vol. 23 (5): 470-475 [
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35
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158
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476
THE MINERALIZATION MECHANISM OF THE XIFENGKOU-DAOERDENG GOLD METALLOGENIC BELT IN EASTERN HEBEI AND WESTERN LIAONING
LIU Dian-zhong, JIN Xiao-xin, WANG Yong, LIU Jing-zhou, WANG Yu-xiang
The gold deposits in the Xifengkou-Daoerdeng metallogenic belt occur in different rocks such as granite, metamorphic rocks and sedimentary rocks. The orebodies are distributed in fault zones and related with hydrothermal fluids. Based on the Pb-S-O-H isotopic data, the gold deposits were formed consistently with Yanshanian granite. The hydrothermal fluids were derived from the granite. Thus the sulfur in pyrite was sourced from the granite. In summary, the gold deposits are post-granite hydrothermal deposits. The granite extracted ore-forming materials from some Archean metamorphic rocks during intrusion, then transported them to shallow level of the crust and deposited in the structural fractures.
2014 Vol. 23 (5): 476-481 [
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51
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482
GEOLOGICAL CONDITIONS OF THE INTERSECTION-TYPE URANIUM METALLIZATION IN CENTRAL SOUTH OF LONGYUANBA COMPOSITE GRANITE BODY IN JIANGXI PROVINCE
DANG Fei-peng, LIANG Fa-hui, LI Zhi-peng
The study area is located in the central south of the Longyuanba composite granite body, which lies in the south of Taoshan-Zhuguang uranium metallogenic belt. During Jurassic and Cretaceous, the tectonic environment in South China was in the transitional situation from compression to extension. Under such a background, the structure system in Longyuanba region is mainly developed in three groups in northeast, northwest and east-west directions. The NW-trending faults are perfectly filled by the intermediate-basic dikes, distributed with equal spaces. The boundaries between the dikes and the granitoids are obvious. The rock types of the dikes are diabase and lamprophyre. The uranium mineralization of the study area commonly occurs in the intersections of grey quartz veins and the intermediate-basic dikes. The dikes around the mineralization fade to brown or light gray from green-gray color, with alterations of silicification, hematitization, hydromicazation, limonitization, pyritization etc. Comprehensive analysis reveals that the uranium mineralization in the area is closely related to the intermediate-basic dikes in space, time and genesis. The study area is with good conditions and potentials for intersection-type of uranic mineralization.
2014 Vol. 23 (5): 482-485 [
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47
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486
TECTONIC EVOLUTION AND PROSPECTING DIRECTION OF GUIZI AREA, GUANGDONG PROVINCE
LYU Dong-lin, ZHAO Peng, ZHANG Hua-nan, ZHOU Di
Based on the analysis of the tectonic evolution and geological events in the Guizi area, Guangdong Province, it is confirmed that the crust in the area is characterized by multi-cycle evolution, with developing stages of geosyncline (Neoarchean-Early Paleozoic), paraplatform (Middle Devonian-Early Carboniferous) and continental margin mobile belt (Late Triassic-Holocene). With research of metallogenic conditions and mineral types, the metallogenesis in different epochs is analyzed. Three major mineralization periods in the studied area are determined. In the light of metallogenesis, oreforming times, distribution of deposits and the geological characteristics of deposits, the prospecting direction is discussed. Totally 11 ore prospective areas are delineated.
2014 Vol. 23 (5): 486-491 [
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33
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182
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492
APPLICATION OF REMOTE SENSING TECHNOLOGY IN EARLY EXPLORATION FOR SHALE GAS IN COMPLEX TERRAIN
ZHANG Cong, BAO Shu-jing, DUAN Wen-zhe
Most of the shale gas blocks for open tendering in China are located within the high-angle structural belt in the southeast of Sichuan basin, where the geomorphology is complex, with developed faults, making the exploration and exploitation difficult. To reduce the risks and costs, the geomorphic factors have to be seriously considered in early stage of shale gas exploration. Based on the remote sensing data from Baojing shale gas block in Hunan Province, with synthesized gradient and elevation factors, this research optimizes favorable areas in this block and provides a reference for further exploration and surface engineering.
2014 Vol. 23 (5): 492-494,499 [
Abstract
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26
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495
GEOLOGICAL SIGNIFICANCE OF RARE EARTH ELEMENTS IN GEOCHEMICAL ANALYSIS
ZHOU Guo-xing, ZHAO En-hao, YUE Ming-xin, CAO Dan-hong
Rare earth elements (REEs) are important tracers in geological study. Analysis on the geochemical characteristics of REEs can well explain some geological phenomena, reveal the genesis of minerals even deposits and guide prospecting, which provide strong technical support for the development of geology.
2014 Vol. 23 (5): 495-499 [
Abstract
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117
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1417KB] (
553
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500
MINERAL DEPOSIT MODEL AND PROSPECTING POTENTIAL OF THE EXPLORATION LICENSE No. 2298 IN NORTHERN TERRITORY OF AUSTRALIA
HE Sheng-hui, ZHANG Yue-kun, RONG Hui-feng, FAN Jing-liang
Based on the geological, geochemical and drilling data about the exploration license No. 2298 in Northern Territory of Australia, the ore-forming geological conditions such as strata and structure are obtained. According to comprehensive research of the geological conditions, the mineral deposit model for EL2298 is sandstone-shale-type of copper deposit, with objective mineral of copper. The exploration should include geological survey, IP intermediate gradient, IP sounding, trenching and drilling. The geological characteristics of deposit suggest good ore-forming geological conditions and prospecting potential for EL2298. It is theoretically and practically possible to find sandstone-shale-type of copper deposit in EL2298.
2014 Vol. 23 (5): 500-504,481 [
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33
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1666KB] (
183
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