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2016 Vol.25 Issue.5,
Published 2016-10-31
407
CHARACTERISTICS OF THE TECTONIC FRAMEWORK OF NORTHEAST ASIAN MESOZOIC ACTIVE CONTINENTAL MARGIN
ZHANG Yun-ping, SONG Wei-min, NA Fu-chao, BAO Qing-zhong, WANG Yan
Northeast Asia is one of the most complex areas of plate tectonic activities in the world. The eastern continental margin accretion zone involves two types, i.e., collisional orogenic belt and accretionary orogen belt. The western margin reactivation zone contains Eastern Siberia ancient land reactivation region (north), East Mongolia-Xing'an-Jihei reactivation region (middle), and eastern Sino-Korea ancient land reactivation region (south). The overall structural framework of the Northeastern Asian Mesozoic active continental margin is characterized by zonation from east to west, segments from north to south, and development from northeast to south. The late Middle Jurassic-early Early Cretaceous sedimentary-volcanic-sedimentary molasse in North China-Mongolia-Xing'an Region, which is a component part of the Northeast Asian Mesozoic activite continental margin in its evolutionary process, is one of the indicators of tectonic system transition.
2016 Vol. 25 (5): 407-423 [
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424
STUDY ON THE HIGHSTAND SAND-GRAVEL LAYERS IN ZALANTUN AREA, NORTHERN DAXINGANLING MOUNTAINS:Geological Implication
QIAN Cheng, QIN Tao, LI Lin-chuan, JIANG Bin, LU Lu, CUI Tian-ri, CHEN Hui-jun, LIU Hang
A large amount of highstand sand-gravel layers is well developed on the pre-Cenozoic basement in southeast Zalantun area on the east slope of Northern Daxinganling Mountains. The distribution, sedimentary characteristics, gravel fabric and sporopollen records of the sand-gravel layers are studied to analyze their origin and climate environment information. Combined with regional geological data, the forming ages and neo-tectonic implication are discussed. The results show that, the highstand sand-gravel layers in the research area can be divided into I-, Ⅱ- and Ⅲ-level, which were formed in Early Holocene, Late Pleistocene and Middle Pleistocene epochs, respectively. The 3 layers are all strong hydrodynamic alluvial deposits, with a few characters of alluvial fan, corresponding to the sedimentary records of the first and second terraces of the Yalu River and the third terrace of the Nenjiang River, respectively. The sporopollen analysis indicates an environment of coniferous forest and grassland with a cool and dry climate when the Ⅱ- and Ⅲ-levels of highstand sand-gravel layers were formed, and an environment of deciduous and latifoliate forest and grassland with a warm and dry climate during the formation of I-level, followed by an environment of grassland and desert under a cold and dry climate. The main channel of the Yalu River has slightly changed from east to west since Late Pleistocene, while the main channel of Nenjiang River has been changing constantly from west to east since Middle Pleistocene. The block between Yaluhe fault and Nenjiang fault has undergone 3 times of uplift since Middle Pleistocene.
2016 Vol. 25 (5): 424-435 [
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436
ZIRCON U-Pb DATING AND GEOLOGICAL IMPLICATION OF THE JINGOU GRANITE IN YILAN AREA, EASTERN HEILONGJIANG PROVINCE
ZHAO Li-gou, WANG Jian-min, WANG Lei, LI Juan-juan
The LA-ICP-MS U-Pb dating is researched for zircon from the Jingou granite in Heilongjiang rock group, which occurs in Yilan area of the Eastern Heilongjiang Province, to identify the formation age and tectonic setting of the Heilongjiang rock group. The results show that the zircon in the sample of D2279 has a clear growth zoning, with Th/U ratios mostly between 0.1 and 1, belonging to typical magmatic zircons. The
206
Pb/
238
U weighted average age is (261.18±0.74) Ma (
n
=20, MSWD=0.66), which represents the crystallization age of the rock. The definition of the age of Jingou granite not only defines the forming age of Heilongjiang rock group, but also provides new evidence for further exploration of the Late Paleozoic tectonic evolution of Jiamusi block.
2016 Vol. 25 (5): 436-442 [
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443
METALLOGENIC CHARACTERISTICS AND ORE-FORMING MODEL OF THE QINGLONGGOU GOLD DEPOSIT IN WESTERN LIAONING PROVINCE
WANG Yong
The Qinglonggou gold deposit, located in the transitional belt between Shanhaiguan uplift and Western Liaoning depression in the Yanliao subsidence zone on the northern margin of North China platform, occurring in Mesoproterozoic carbonate rocks, is a representative of the same type in Western Liaoning Province. On the basis of field investigation and laboratory analysis for the source bed, mineralization temperature, alteration features and storage conditions of gold deposit, it is concluded that the deposit belongs to epi-mesothermal type. The ore-forming fluid is the mixture of magmatic water and groundwater. The gold is derived from mainly the carbonate rock of Wumishan Formation. Affected by multiple stages of tectonic activities, the gold experienced a number of extraction and enrichment. The occurrences of orebodies are strictly controlled by the interlayer breccia zones and tectonic fracture zones, showing the characteristics of dual controls by stratigraphy and structure.
2016 Vol. 25 (5): 443-448 [
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449
FURTHER STUDY AND DETERMINATION OF THE METALLOGENIC EPOCH OF WULONGGOU GOLD DEPOSIT IN QINGHAI PROVINCE
MA Fu-gui, TIAN Cheng-sheng, MA Guo-dong, ZHAO Fa-rui, CHEN Su-long
The Wulonggou gold deposit, located in northern margin of the middle section of Eastern Kunlun Mountains in Qinghai Province, is the most prospective deposit in the Eastern Kunlun metallogenic belt. Based on collection of geologic data about the ore-forming tectonic setting, regional stratigraphy, lithology, structure and igneous rocks of Wulonggou gold deposit, with isotopic dating by alpha quartz activation(HAESRDQ) and Ar-Ar methods for gold ore and surrounding ductile shear zone, this paper analyzes the ages of ductile deformation, syntectonic alkaline magmatic activity, metallogenic material source and gold mineralization. By these data, with previous results, it is concluded that the ductile shearing deformation of Wulonggou area ended at about 240 Ma, namely Early-Middle Triassic or Early Indosinian epoch; the age of gold metallogenic material source area is between 235 Ma and 179 Ma, i.e., Late Indosinian-Early Yanshanian epoch; while the mineralization is dated at 91-21 Ma of Late Yanshanian to Early-Middle Himalayan epoch.
2016 Vol. 25 (5): 449-453 [
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454
GEOLOGY, METALLOGENY AND GENESIS OF THE HEISHUIGOU ZINC-POLYMETALLIC DEPOSIT IN GUANGXI REGION
ZHOU Jie-jun, XIE Ting-yong, CHENG Feng, TANG Ming-fu
The Heishuigou Zn-polymetallic deposit in Guangxi is tectonically located in the southwest of Jiangnan oldland and the northeast of Youjiang basin, on the margin of the Yangtze craton. Seven main orebodies with 44 ore veins, which occur in the Devonian formations, are found in the orefield. The Dachang fault serves as the ore-guiding structure. The Heishuigou fault plays an important role in the control of metallogeny. The faulted bedding plane of Dachang anticline provides a proper space for later mineralization. The ore-bearing fluids replace the strata or fill in the space by decollement to form orebodies.
2016 Vol. 25 (5): 454-457,493 [
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458
LITHOFACIES TRANSITION AND RESOURCES ESTIMATION OF THE YANLONG BAUXITE DEPOSIT IN HENAN PROVINCE
ZHOU Hong-chun, LI Jian-quan, CHEN Yong-cai, XI Shan-feng, ZHANG Qing, CHEN Guang, YANG Yuan-yuan, HAO Jin-yu
The Yanlong bauxite deposit is a typical concealed deposit in western Henan Province. The authors analyze the phase relationship and element contents of the orebodies of bauxite, clay, laterite and siderite in vertical and profile with ore-bearing characteristics. The variation in elements in ore has a close relationship with lithofacies. The relation between minerals is characterized by lithofacies transition. Based on this understanding, the paper offers a reasonable resources estimation for the sedimentary minerals.
2016 Vol. 25 (5): 458-463 [
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464
CHARACTERISTICS OF TRACE ELEMENTS IN OIL SHALE AND PALEOENVIRONMENT RECOVERY IN THE METALLOGENIC PERIOD IN SOUTHERN SONGLIAO BASIN
CHANG Si-yang, GUO Wei
The paleoenvironment in the metallogenic period of oil shale controls the organic type and abundance of oil shale, which is important for research of the origin and enrichment regularity of oil shale. In southern Songliao Basin, the oil shale formations are generally stable deep lake to semi-deep lake facies. The characteristics of trace elements are sensitive to the changes of ancient environment. Therefore, the contents of trace elements in oil shale and their ratios can be used to restore the paleoenvironment of oil shale in metallogenic period. This article, through test of more than 20 trace elements and analysis for their ratios of the oil shale samples from southern Songliao Basin, restores the paleoenvironment of the Qingshankou Formation and Nenjiang Formation. The results show that the oil shale in the metallogenic period experienced a warm humid-subhumid and dry heat climate, in a reduction environment of brackish water. To compare with the counterparts of Nenjiang period, the climate and salinity changes of Qingshankou period are more stable, with a slightly drier climate and a higher salinity.
2016 Vol. 25 (5): 464-469 [
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470
GEOCHEMISTRY OF LIGHT HYDROCARBONS AND DIAMONDOIDS AND SOURCE ANALYSIS OF OIL FROM TC1 WELL IN TUQUAN BASIN
SUN Peng, TANG You-jun, LI Shi-zhen, GONG Fan-hao
The techniques of gas chromatography(GC) and gas chromatography-mass spectrometry(GC-MS) are adopted to study the characteristics of light hydrocarbon and diamondoids from TC1 well in Tuquan Basin, which can help reveal the parent material type, depositional environment, maturity and other geochemical and geological information of crude oil. The obvious superiority of pristane content to phytane (Pr/Ph=3.17) of the oil from TC1 well indicates that the source rock was deposited in a relatively oxidizing environment. The discrimination diagram shows that the parent material belongs to Ⅱ
2
-Ⅲ type, with methyl cyclohexane (MCH) index of 46%, cyclohexane (CH) index of 25% and predominant 3,4-DMD relative amount of 48% in 2 methyl adamantane. With the data of heptane(IH) index(27.6%), isoheptane(Ⅱ) index(33%), IMA (0.63) and IMD (0.38), the Ro value can be calculated to be 1.2%, revealing that the oil is in mature-highly mature stage. Combined with the previous research data, the crude oil from TC1 well is deduced to generate in the mudstone of Middle Jurassic Wanbao Formation.
2016 Vol. 25 (5): 470-475 [
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476
ORGANIC GEOCHEMISTRY OF THE SOURCE ROCKS OF LOWER JURASSIC WUDANGGOU FORMATION IN SHIGUAI BASIN, INNER MONGOLIA
FENG Yan, YANG Cai, GUO Jia-cheng, XIA Ning, LIN Hai-tao
Dark mudstone and shale of Lower Jurassic Wudanggou Formation are well developed in the Shiguai Basin in Inner Mongolia. Based on geological exploration, typical profile survey, sampling and experimental analysis, the organic geochemical studies are conducted in the aspects of organic matter abundance, kerogen types and maturity of organic matter to evaluate the hydrocarbon potential. The total organic carbon (TOC) contents of the Lower Jurassic hydrocarbon source rocks of Wudanggou Formation range from 0.7% to 12.4%, corresponding to organic matter type of Ⅱ
2
-Ⅲ. The vitrinite reflectance is between 0.47% and 0.71%, indicating that the hydrocarbon source rocks mostly achieved low mature stage of evolution. The Wudanggou Formation is the important hydrocarbon source rock in the central area of Inner Mongolia, with potential of unconventional energy of shale gas.
2016 Vol. 25 (5): 476-481 [
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482
ANALYSIS OF THE GROUND COLLAPSE IN DONGSHANCUN OF BAISHAN CITY, JILIN PROVINCE
ZHANG Chun, CUI Xiu-li, YANG Shuai, WANG Hui-ming, ZHANG Hong-xue
The ground collapse area in Dongshancun, Baishan City, is in a bad situation of stability, which seriously threatens the safety of local residents and properties. Based on field investigation and geophysical verification, with comprehensive analysis of the forming mechanism and reason of the collapse area, it is identified as a karst collapse, belonging to medium degree of geological disaster.
2016 Vol. 25 (5): 482-486 [
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487
RESEARCH OF THE CHARACTERISTICS AND ZONATION OF GEOLOGICAL HAZARDS IN ZHONGYANG COUNTY, SHANXI PROVINCE
WANG Tao, DUAN Peng
The geological hazards in Zhongyang County, Shanxi Province, involve mainly collapse, potential collapse, debris flow, ground fissure, ground subsidence, etc. Among them, the collapse and potential collapse account for 64.14% of the total geological disasters in the county, which are characterized by small scale and great danger. This paper analyzes the development characteristics, distribution, forming conditions and influencing factors of the geological hazards in Zhongyang. According to the regional situation, the quantitative assessment principle by harassing coefficient (
R
) method is adopted, with the
R
value obtained by geological hazard status and development degree(number and size) from the field survey, to evaluate the zonation and distribution of geological disaster risk areas and establish the suitable prevention systems.
2016 Vol. 25 (5): 487-493 [
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494
MapGIS-BASED THREE-DIMENSIONAL GEOLOGIC MODELING: A Practice of the 1:250 000 Scale Deep Geological Survey in Jarud Qi, Inner Mongolia
DING Qiu-hong, YAO Yu-lai, WANG Jie, LI Xiao-hai, LI Wen-bo
This paper systematically summarizes the technical method of 3D geologic modeling with -medium scale (1:250 000) deep geological survey. Based on the service platform of MapGIS, database technology of DGSS and 3D visualization technology of CREATAR, the technical method of 3D geologic modeling with medium scale, and its visualization are realized. Adopting 3D visualization technology, on the basis of 2D geological survey result, synthesizing the multi-information about geology and geophysics, the 3D model of geologic structure is inferred and constructed, which can reveal the distribution and interrelation of various geologic bodies and geological phenomenon in certain depth underground. This method will offer technical support for the effective geological research and petroliferous basin forecasting.
2016 Vol. 25 (5): 494-499 [
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500
LAND COVER TRANSITION IN THE SHUANGHE NATURAL RESERVE AREA, HEILONGJIANG PROVINCE: A Study Based on Landscape Transfer Matrix
FENG Yu-lin, YANG Jia-jia, WU Meng-hong
Based on RS/GIS technology and transfer matrix data model, the RS images of the Shuanghe Nature Reserve Area in two historic periods (2005 and 2012) are selected for quantitative analysis of the land use changes and landscape transfer regularity in the area during the 7 years. The study shows that the conversion between forestland, shrub and grassland is obvious, which has a direct relation with the environmental factors in the area. Because the base areas of swamp, water, resident place and bare soil are small, the transition between them is limited. Dry farmland changed notably during this period. Except for resident place, the rest 6 types of landscape areas are all partially converted into dry land. Active mutual transition took place between forestland and grassland, as well as shrub and forestland. This result would hopefully provide a scientific basis for the ecological management and sustainable development planning of the reserve area.
2016 Vol. 25 (5): 500-504 [
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