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2017 Vol.26 Issue.6,
Published 2017-12-31
529
STUDY ON THE CHRONOLOGY OF GRANITIC PORPHYRY IN HORQIN YOUYI ZHONGQI, INNER MONGOLIA
YANG Xiao-ping, SONG Wei-min, PANG Xue-jiao, NA Fu-chao, LIU Ying-cai, TAO Nan, FU Jun-yu, SUN Wei, WANG Yan
The isotopic chronological study indicates that the LA-ICP-MS zircon U-Pb weighted-average age of the granitic porphyry in Horqin Youyi Zhongqi, Inner Mongolia, is 163.3±2.9 Ma, suggesting the rock body emplaced at the late period of Middle Jurassic. Characterized by A-type granite, the granitic porphyry represents extensional tectonic magmatic activity. Combining the regional geological data and previous research, the Middle Jurassic granitic porphyry is possibly the product of post-orogenic extensional environment. The determination of its phases can provide new data for the formation and evolution of Songliao Basin.
2017 Vol. 26 (6): 529-533 [
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45
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534
THE VOLCANIC ROCKS IN MANKETOUEBO FORMATION FROM TAERQI AREA, SOUTH-CENTRAL DAXINGANLING MOUNTAINS: Geochemical Characteristics and Geological Implication
LI Shang-qi, LI Jun-tao, ZHU Xiao-ping, WU Guo-xue, LIU Xue-song, LI Sen-lin
The volcanic rocks in Manketouebo Formation from Taerqi area are mainly rhyolite, rhyolitic tufflava and rhyolitic crystal tuff. The analysis results of major elements indicate that the volcanic rocks are characterized by quasi aluminum-weak peraluminum, with Al
2
O
3
=11.55%-14.76% and A/CNK=1.01-1.35, rich alkali (Na
2
O+K
2
O=4.56%-8.79%) and poor calcium and magnesium. The average content of REEs in the volcanic rocks is 168.69×10
6
. The distribution patterns show right-dipping curves with slight enrichment of LREEs and relatively flat distribution of HREEs, with distinctive negative Eu anomaly (δEu=0.29-0.72) and Rb/Sr=0.3-11.4. The trace elements are obviously enriched in LILEs such as Rb, Ba and K, but depleted in HFSEs like Nb, Ta and Ti. Combined with the geochemical characteristics and previous research data, it is thought that the volcanic rocks in Manketouebo Formation, bearing the typical characteristics of crust-derived magma, with residual plagioclase or fractional crystallization of plagioclase in the magma source area, belong to A-type, which is possibly the product of lithosphere extension tectonic system after the closure of Mongolia-Okhotsk Ocean.
2017 Vol. 26 (6): 534-541 [
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48
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542
GEOCHRONOLOGY AND GEOCHEMISTRY OF THE JURASSIC GRANODIORITE IN JIANGJIATUN, TUQUAN COUNTY OF INNER MONGOLIA
TIAN Zi-long, ZHAO Qing-ying, LI Zi-hao, QIU Shi-long, LI Shi-xian, ZHENG Ze-yu
Study on the isotopic chronology and lithogeochemistry of the Jiangjiatun granodiorite in Tuquan County, Inner Mongolia, indicates that the LA-ICP-MS zircon U-Pb weighted average age for the rock body is 154.8±1.8 Ma, which represents Late Jurassic. The petrological and geochemical data shows the granodiorite, belonging to high-K calc-alkaline series and A-type granite, is characterized by high SiO
2
(66.08%-67.80%), rich alkali (K
2
O+Na
2
O=7.35%-7.97%), rich Al
2
O
3
(14.5-15.23), poor MgO (1.08%-1.62%), poor CaO (2.05%-3.04%) and low TiO
2
(0.56%-0.67%). The REE pattern curves are right-dipping with evident negative Eu anomalies and well LREE fractionation. The primitive mantle normalized trace element spidergrams show distinct negative Sr, Ba and Ti anomalies, depletion of Sr,Ba, Ta and Nb,and relative enrichment of Th,Zr,Hf and Pb. From the above, it is thought that the Jiangjiatun granodiorite is the product of post-orogenic lithosphere extension and shear thinning background affected by the subduction of Paleo-Pacific Plate.
2017 Vol. 26 (6): 542-551 [
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42
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552
OCCURRENCE AND PROSPECTING SIGNIFICANCE OF GOLD IN THE LOULI GOLD DEPOSIT IN HANDAN, HEBEI PROVINCE
ZHAO Shu-mei, LI Yu-cheng, CAO Ni-tao
Study on the characteristics of Louli gold deposit indicates that the Au element, mainly occurring as fine-grained natural gold, is dispersively disseminated in the fissures of strongly altered tuff and trachyte. The proportion of gold in quartz vein and limonite is 12.5%, much less than that in the altered tuff with developed schistosity, showing the particularity of prospecting indicators of the deposit. Considering the lithological distribution characteristics around the known gold orebodies in the field, it is believed that the developed zones of schistosity and interlayer fissures together with the aegirine-augite-bearing fine-grained orthophyre should be the focus of further exploration.
2017 Vol. 26 (6): 552-556,541 [
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557
ORE-FORMING FLUIDS AND GENESIS OF QIYIMUCHANG LEAD-ZINC DEPOSIT IN ERGUNA AREA, INNER MONGOLIA
DUAN Ming-xin, REN Yun-sheng, GUO Hong-yu, WANG Bo-chao, ZHAO Xi-dong, CAI Yan-long
The Qiyimuchang lead-zinc deposit, newly discovered in the Erguna metallogenic belt, Inner Mongolia, has the ore-forming potential of middle-large scale. The petrographic observation, microthermometry and Laser Raman spectrum analysis of fluid inclusions in quartz formed in the major metallogenic stage are carried out to determine the characteristics of ore-forming fluids and the genesis of deposit. The results indicate that three main types of fluid inclusions are developed in quartz, including two-phase (liquid-rich and vapor-rich), CO
2
-bearing three-phase, and a few daughter mineral-bearing three-phase inclusions, with the homogenization temperatures ranging from 132 to 342℃, generally concentrated in 130-200℃ and 240-320℃, and the salinities of three types being 0.5%-9.9%, 3.0%-11.9%, 42.4% and 44.2%, respectively. The Laser Raman spectrum analysis shows that the gaseous compositions are mainly H
2
O and CO
2
. The fluid boiling plays an important role in the deposition of mineral materials. The deposit, hosted in the Mesozoic volcanic rocks, belongs to the epi-mesothermal vein-type related to hypabyssal-ultra hypabyssal magmatism.
2017 Vol. 26 (6): 557-563 [
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40
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564
GEOLOGY AND METALLOGENIC EVOLUTION MODEL OF THE JIANCAODI BAUXITE DEPOSIT IN SANMENXIA, HENAN PROVINCE
LI Jian-quan, XI Shan-feng, ZHAO Xiao-ning, LI Shu-wen, ZHAO Qin, FENG Jian-tao, WANG Meng, PEI Man-yi
Based on the geological characteristics of Jiancaodi bauxite deposit in Sanmenxia, the ore-forming material sources, ore-controlling factors and metallogenic evolution model are analyzed. The Benxi Formation, as the ore-bearing layer of the deposit, was formed under the coupling processes of sedimentary discontinuity, sedimentary paleogeography and paleostructure, followed by uplift, denudation and local accumulation. Its metallogenic evolution model has typical prospecting significance in western Henan.
2017 Vol. 26 (6): 564-569 [
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570
CHARACTERISTICS AND RESERVOIR-FORMING CONTROL OF FAULTS IN THE WEST WING OF CHEPAIZI UPLIFT, JUNGGAR BASIN
WU Kong-you, QIE Run-zhi, LI Tian-ran, LI Si-yao
With analysis on the seismic and well logging data, it is thought that two sets of deep and shallow fracture systems, divided by the unconformity boundary on the top of Paleogene, are developed in the west wing of Chepaizi uplift, with reverse faults developed in the deep and normal faults in the shallow part. The fractures were formed in three stages. The deep fractures control the development of the shallow fractures as well as the Mesozoic deposition. The Jurassic sand bodies and fractures in the fault trough are important pathways for oil-gas migration. According to the sealing ability analysis, the shallow normal faults serve as the main transport pathways in S1 member but the barriers in S2, while the deep reverse faults are mainly carriers in Jurassic. Fractures in different positions also differ in reservoir-forming control functions. The faults control the effectiveness of entrapment, provide migration pathways and connect oil-gas resources between deep and shallow, thus control the distribution. Based on the analysis above, it is concluded that there are three oil-gas migration pathways in the west wing of Chepaizi uplift.
2017 Vol. 26 (6): 570-576 [
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42
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577
STUDY ON THE SEDIMENTARY CHARACTERISTICS OF THE OIL-BEARING LAYERS C-8 AND C-9 OF YANCHANG FORMATION IN PINGBEI AREA, ORDOS BASIN
DONG Li-hong, LI Xin-wei, DU Yan-jun, SHI Xiao-zhang, MA Lang
Good oil and gas shows are discovered in the exploration of oil-bearing layers C-8 and C-9 in Yanchang Formation, Pingbei area. Combining the data of well logging, geological logging, drill core and chemical analysis, a comprehensive study is conducted on the petrological, paleontological and geophysical characteristics of C-8 and C-9. The results show that the lacustrine-delta depositional systems, mainly delta front facies and shore-shallow lacustrine or prodelta sedimentary facies, are developed in the Pingbei area during the sedimentary period of C-8 and C-9, which can be subdivided into underwater distributary channel, underwater distributary interchannel, distant sandbar, shore-shallow lacustrine mudstone and prodelta mudstone microfacies. Among the facies above, the sand body of underwater distributary channel is relatively developed, serving as the main oil-gas accumulation place.
2017 Vol. 26 (6): 577-582,595 [
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583
SEDIMENTARY CHARACTERISTICS OF THE FOURTH MEMBER OF QUANTOU FORMATION IN NORTHERN YUMIN AREA OF SONGLIAO BASIN
XUE Chun-qi, HU Ming-yi, SUN Chun-yan, WANG Dan-ling
To study the fourth member of Quantou Formation (Q4) in Yumin area, Songliao Basin, the principle of high-resolution sequence stratigraphy is combined with well logging and lithologic data to identify the sequence boundary and divide the strata, then establish the sequence stratigraphic framework, and finally analyze the sedimentary facies and distribution. The result indicates that Q4 can be divided into three mid-term cycles and seven short-term cycles, with development of meandering river and shallow delta facies, from which four sedimentary subfacies of river flood, riverbed, delta plain and delta front, and various microfacies can be identified. Based on the analysis of sedimentary facies types, lithologic association, plane distribution and vertical variation of sedimentary facies, the sedimentary microfacies maps of subdivision layers are drawn, which can provide prediction for prospecting favorable sand body.
2017 Vol. 26 (6): 583-589,615 [
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590
RESERVOIR SPACE AND MINERAL COMPOSITION OF THE SHALE FROM SILURIAN LONGMAXI FORMATION IN SICHUAN BASIN
SHEN Juan, LI Xiao-ping, AN Sheng-ting, JIN Hao, HU Pei-qing
The shale of Lower Silurian Longmaxi Formation in Changning area of Sichuan Basin is studied for its petrologic characteristics, mineral compositions, types and influencing factors of reservoir space, on the basis of field survey of outcrop profile, along with SEM and mineral content analysis. The results show that four kinds of reservoir space, including pyrite pore, intergranular micropore and microcrack in clay minerals, organic matter pore and interlayer bedding joint are developed in the shale, which are controlled by lithofacies, mineral composition and diagenesis. The obvious mineral characteristics of shale reservoir are of great significance for the exploitation of shale gas in the study area.
2017 Vol. 26 (6): 590-595 [
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596
GROUNDWATER IN THE BEIHANCONG RIVER VALLEY OF SUIFENHE CITY, HEILONGJIANG PROVINCE: Water Quality Protection and Advice on Exploitation and Utilization
LI Xiao, JIA Li-guo, WANG Xiao-guang, ZHU Wei, CAI He, CHAI Lu
To grasp the groundwater quality of Beihancong River Valley in Suifenhe City and provide reasonable development advice to the local government, the fuzzy comprehensive assessment and hierarchical ladder methods are used to evaluate the groundwater quality and pollution situation respectively. The in-situ test techniques such as geophysical and pumping tests are also applied to demonstrate the regional groundwater abundance on the basis of geological and hydrogeological investigation and water sampling. The result shows that the quality of fissure confined water is generally at Grade I to III, in non-pollution level, which means suitable for drinking. Since the water inflow in the Mesozoic structural fracture zone can reach over 350m
3
·d
-1
, it is suggested that the local government should focus on geophysical water exploration around the fracture zone, and carry out the groundwater resource zoning protection planning.
2017 Vol. 26 (6): 596-602 [
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34
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603
EVALUATION ON THE WATER ENVIRONMENT BEARING CAPACITY IN NAIMAN QI, INNER MONGOLIA
MA Shi-min, LI Xu-guang, YANG Ze, LI Xiao, HE Hai-yang, ZHU Wei, WANG Chang-qi
The selection of water environment evaluation model index system and the determination of weight are the keys to study the bearing capacity model. Based on five factors of groundwater vulnerability, water environmental quality, water pollution, exploitation degree and the effect of polluted river on groundwater, the comprehensive evaluation and exploitation potential of groundwater environment in the study area are analyzed, with AHP (analytic hierarchy process) as the quantitative research method, adopting the expert grading method to determine each index weight and judge the reliability and validity of the evaluation index system. According to the obtained assessment scores, the division map of bearing capacity evaluation is drawn for the rational utilization of groundwater resources.
2017 Vol. 26 (6): 603-607 [
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36
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608
THE TIANCHI VOLCANIC MUDFLOW IN CHANGBAI MOUNTAINS: Its Distribution and Disaster Research
ZHU Wei, CAI He, TANG Wen, FENG Yu-lin
The Tianchi in Changbai Mountains is an active volcano with the most disastrous eruption dangers in China. Its mudflow is one of the most deadly volcanic hazards. The provenance of mudflow formed by the eruption about 1000 years ago, accumulation mode and distribution characteristics, as well as the causes and scales of volcanic mudflow disaster, are systematically expounded on the basis of various deposits at different distances from the caldera, and the profiles by field survey. A preliminary prediction and division of high and low danger zones of volcanic mudflow disasters are made by analysis on the 1 ka volcanic eruption. The ERDAS software is used to predict the water rushing down disaster caused by volcanic eruption, including the outlet and water flow. This study provides a scientific basis for disaster prevention and mitigation in the region.
2017 Vol. 26 (6): 608-615 [
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616
APPLICATION OF REMOTE SENSING DATA WITH GF-1 SATELLITE IN GLACIER CHANGE MONITORING
ZHI Rui-rong, GU Yan-qun, LI Zhans
The China-made GF-1 satellite data is first selected in glacier change monitoring in Qilian Mountains of Qinghai Province for data sources. The change of glaciers is described by comparing the GF-1 remote sensing data with previous Landsat data of the same scale in terms of area, space, type and structure changes as well as change rates. The comparative study indicates that the GF-1 satellite remote sensing data, superior to medium-low resolution data like ETM in either spectral or textural information, can completely meet the needs of 1:100 000 remote sensing investigation and monitoring in collecting, processing and monitoring the glacier change information. The multispectral data of GF-1 satellite can form correlation data set together with the historical data of Landsat and Aster. The glaciers in Qilian Mountains did not change significantly as a whole, but varied greatly in internal structures and spatial-temporal distribution, with a decreasing trend in both area and number. Considering the specificity of glaciers, it is necessary to get the best remote sensing data in the best season annually.
2017 Vol. 26 (6): 616-619,624 [
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620
CALCULATION OF MIXED FORMATION WATER RESISTIVITY IN WATER FLOODED LAYER AT DIFFERENT WATERFLOOD STAGES
ZHU Xue-juan, SHAN Sha-sha
The mixed formation water resistivity in water flooded layer is a required parameter in the evaluation of residual oil saturation. Due to the ion exchange between injected water and original formation water in the middle-late stages of development, parallel conductance model can not be used to calculate the mixed formation water resistivity. A more appropriate method is needed. Firstly, the calculation method of resistivity for different mixed formation water is determined, in terms of the two different conditions of non-ion exchange and complete ion exchange. Then considering the actual injection process, the calculation model of dynamic mixed formation water resistivity is confirmed, which use ion exchange rate, calculated by the rock-electric experiment data and Archie Formula, to show the change rule of mixed formation water resistivity at different stages. Finally, the saturation calculation method of mixed formation water resistivity is presented to provide programming ideas for quantitative logging-interpreted mass data processing.
2017 Vol. 26 (6): 620-624 [
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