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2018 Vol.27 Issue.2,
Published 2018-04-30
107
THE LATE JURASSIC I-TYPE GRANITE FROM BAOHETUN OF TUQUAN REGION IN EASTERN INNER MONGOLIA: Geochemistry, Petrogenesis and Geologic Implication
QIU Shi-long, ZHAO Qing-ying, LI Shi-chao, LI Zi-hao, TIAN Zi-long, LI Shi-xian, ZHENG Ze-yu
The Baohetun intrusive pluton in Tuquan region of eastern Inner Mongolia is outcropped in the eastern slope of the middle section of Daxinganling Mountains. The granite porphyry shows a zircon U-Pb age of 145.9±3 Ma, formed in Late Jurassic. The lithogeochemical data reveal that the intrusion is characterized by high Si (69.62%-77.43% of SiO
2
, averagely 74.14%), rich alkali (6.93%-8.94% of K
2
O+Na
2
O, averagely 8.27%), rich Al (12.27%-14.46% of K
2
O+Na
2
O, averagely 13.35%) and poor Ti, Fe and Mg, with A/CNK>1.1, belonging to high-K calc-alkaline series. The trace elements feature the enrichment of Th, K, Hf and Rb, and depletion of Ba, Nb, Ta, Sr, P and Ti, while the REEs show enriched LREEs with (La/Yb)
N
=2.2-13.8 and obvious negative Eu anomaly (δEu=0.1-0.63). These features above indicate that the granite porphyry belongs to peraluminous high fractioned I-type granitoids. The samples are plotted into the post-orogeny field in the tectonic discrimination diagram, which illustrates the Baohetun granite is classified as postorogenic granitoids. Combined with previous study, it is believed that the Baohetun granite porphyry is probably related with the extensional tectonics after the closure of Mongolia-Okhotsk Ocean.
2018 Vol. 27 (2): 107-116,136 [
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117
GEOCHEMISTRY AND TECTONIC ENVIRONMENT OF THE VOLCANIC ROCKS FROM ELASHAN FORMATION IN ZHONG JUH AREA, QINGHAI PROVINCE
ZHAO Ming-fu, SHI Lian-chang, LI Cheng-fu, WEI You-ning, LI Yu-long
Study on the volcanic rocks from Elashan Formation in Zhong Juh area, Qinghai Province, indicates that it belongs to acid-intermediate high-K and low-Ti calc-alkali series. The analysis results reveal that ∑REE varies from 139.45×10
-6
to 219.55×10
-6
, with enrichment of LREEs (LREE/HREE of 7.695-13.46, averagely 9.09). The distribution patterns show gently right-dipping smooth curves with weak negative Eu anomaly(δEu=0.53-0.83). The general uniformity of trace element curve patterns reflects the homogeneity of volcanic rocks in this area. According to the analysis on tectonic environment, it is concluded that the volcanic rocks is the product of magmatic arc formed by compression and collision.
2018 Vol. 27 (2): 117-123 [
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124
STUDY ON THE EPIGENETIC STRUCTURE OF Ferganiella FROM MIDDLE JURASSIC XISHANYAO FORMATION IN JUNGGAR BASIN, XINJIANG
YANG Tao, ZHANG Yu-jin, E Jing-wen
The Ferganiella sp. from Middle Jurassic Xishanyao Formation in Baiyanghe area of Juggar Basin, Xinjiang is observed through scanning electron microscope (SEM). The fossil is characterized by non-orientated stomatal aperture which can distinguish it from Podozamites and Lindleycladus. The current study can supplement the data for Ferganiella and restoration of paleo-geography and environment in Baiyanghe area, and improve understanding of Coniferales plants in Middle Jurassic and classification study of fossils.
2018 Vol. 27 (2): 124-129 [
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130
MINERALIZATION CHARACTERISTICS AND GEOLOGICAL IMPLICATION OF THE URANIUM DEPOSITS IN GUNZIGOU AREA OF MOSHISHAN VOLCANIC BASIN, HEILONGJIANG PROVINCE
FENG Bo, ZHANG En, WANG Bing, CAO Qiu-yi, LU Hui-xiong, YANG Yan-chao, MA Mi-tang, ZHANG Chun-lei, LI Jing-yue, CHENG Xu
The Moshishan volcanic basin, located in the middle of the Binxian-Yichun-Gansin volcanic-type uranium-molybdenum metallogenic belt, is a small-medium sized Cretaceous volcanic basin. A uranium mineralization anomaly is newly discovered with one anomaly belt and two high anomaly points in Gunzigou area in the north of the basin. Based on the geological and mineralization characteristics, combined with regional tectonic setting, stratigraphy, intrusive rocks and structures, by analysis on the metallogenic condition and ore-controlling factors, it is thought that the host rock occurred in the anomaly area is cataclastic rhyolite of Ningyuancun formation, Early Cretaceous, controlled by the NNE-trending fault. The main alteration types are silicification and hematitization with obvious zonation. The comparative analysis with regional uranium-productive volcanic basins shows that Moshishan volcanic basin has greater mineralization prospects. According to the uranium mineralization characteristics in Guizigou area, further uranium prospecting in volcanic basins can be carried out.
2018 Vol. 27 (2): 130-136 [
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64
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137
METALLOGENIC CONDITIONS AND PROSPECTING POTENTIAL OF URANIUM IN NANMU VOLCANIC BASIN, NORTH SECTION OF DAXINGANLING MOUNTAINS
FAN Yue-ye, XI Hai-yin, DONG Ming
The Nanmu volcanic basin is located on the Linxi-Zhalantun polymetallic metallogenic belt in the middle-north section of Daxinganling Mountains. The investigation on its basement and caprock shows high uranium content with developed structures, which is favorable for the mobilization, migration and enrichment of uranium. The uranium mineralization on the surface is also good with large scale. From the above, it is concluded that the basin has the geological tectonic environment for volcanic uranium mineralization with good metallogenic conditions and prospecting potential.
2018 Vol. 27 (2): 137-140 [
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141
REGIONAL GEOCHEMISTRY AND ITS RELATIONSHIP WITH MINERALIZATION OF WUDAOGOU AREA IN HEIHE, HEILONGJIANG PROVINCE
ZHENG Quan-bo, MA Jiang-shui, YANG Xiao-ping
The Wudaogou area, located in the juncture of Xing'an massif and Songnen massif and the eastern part of Duobaoshan ore-concentrated area, has favorable metallogenic geologic conditions. The geochemical prospecting method plays an important role in the mineral survey in this forest-covered area. The regional geological and geochemical explorations and soil surveys in key areas are carried out hierarchically to determine the major minerals and delineate the key prospecting targets, which have obtained certain results. Two copper occurrences, two gold mineralization spots, ten gold (copper) mineralization information sites, and three prospecting clues are newly discovered through anomaly verification. Three Level-I and two Level-II prospecting targets are also delineated. By study on the distribution of elements, combined with metallogenic geologic background analysis, it is thought that there is local enrichment of elements such as Au, Ag, Cu and Pb, among which Au and Cu have great metallogenic probability. The mineralization is closely related to Mesozoic magmatism.
2018 Vol. 27 (2): 141-148 [
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149
RESEARCH PROGRESS AND DISCUSSION ON THE METALLOGENIC BACKGROUND OF DIAMOND IN SOUTHERN LIAONING
ZHAO Chun-qiang, ZHANG Zhi-bin, SHI Yi, SHI Shao-shan, YOU Hong-xi, LI Jing, ZHAO Jing-yang
This paper summarizes the geotectonic background and regional metallogenetic setting of diamond in southern Liaoning Province and analyzes the deposit characteristics and ore-bearing potential of kimberlite, and the metallogenetic epoch and mantle source environment of diamond as well. It finally discusses the metallogenic model of primary deposit and formation period and genesis of diamond.
2018 Vol. 27 (2): 149-159 [
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160
METALLOGENIC REGULARITY AND PROSPECTING POTENTIAL OF IRON-COPPER-GOLD-POLYMETALLIC DEPOSITS IN ALXA AREA, INNER MONGOLIA
YANG Jian-jun, FENG Ji, LI Peng
The Alxa area is situated in the conjunction of multiple tectonic units with prospecting potential. It stretches across the northern epicontinental accretionary zone of North China Plate, the North China Block, the eastern epicontinental accretionary zone of Tarim Plate and the southeastern epicontinental accretionary zone of Kazakhstan Plate. Based on the specific metallogenic geological environment, the paper conducts a detailed study on the distribution of deposits and ore occurrences, types and mineralization geological background, then summarizes the geological characteristics and metallogenic regularity of three metallogenic belts, namely Yagan-Har Orbog, Tamusugelage-Bumbat and Aguin Sum-Diebusige, and finally analyzes the prospecting potential.
2018 Vol. 27 (2): 160-165 [
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166
GEOLOGY, ORE-CONTROLLING FACTORS AND PROSPECTING DIRECTION OF THE ADATANGOUNAO COPPER POLYMETALLIC DEPOSIT IN QINGHAI PROVINCE
YU Xiao-liang, CAI Cheng-long, SHI Hai-yan, JIN Hao, YANG Yan-qian, BAO Shan-bin
The Adatangounao Cu polymetallic deposit is located in the Variscan Qimantage-Dulan Fe-Co-Cu-Pb-Zn-Sn-wollastonite Grade-Ⅲ metallogenic belt. Five Cu-Pb-Zn mineralized belts are discovered, including seven Cu and Pb-Zn orebodies. Mainly controlled by fault structures, the orebodies are characterized by various alterations such as limonitization, pyritization, sericitization, silicification, and carbonatization. The ore-controlling factors and their prospecting significant for the area are discussed by analyzing the geological characteristics of the deposit.
2018 Vol. 27 (2): 166-172 [
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173
METALLOGENIC SERIES AND LINEAGE OF DEPOSITS IN GUANGDONG PROVINCE
YANG Da-huan, WU Guo-zhong
Based on the theory of metallogenic series, the deposits in Guangdong Province are studied by combining the mineragenetic epoch, geotectonic environment, significant mineralization and deposit associations. The deposits are divided into 21 series with 37 subseries. The metallogenic lineage is established according to the evolutionary relationship between metallogenic cycles and series. The study shows that the metallogenic series are obviously uneven in spatial-temporal distribution but with sequence and cyclicity over time. Finally, the existing problems in study are discussed and suggestions for further study are put forward.
2018 Vol. 27 (2): 173-185 [
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186
EVALUATION ON THE SOURCE ROCKS FROM X-D1 WELL IN XIUSHUI BASIN, NORTHERN LIAONING PROVINCE
YAO Yu-lai, LI Xiao-hai, SI Jiang-fu, DING Qiu-hong, LI Wen-bo
The dark mudstone from Jiufotang and Yixian formations in X-D1 well of Xiushui Basin, northern Liaoning Province, is evaluated in terms of organic matter abundance, type and maturity based on the organic geochemical data such as organic carbon and pyrolysis. The results show that the mudstone of Jiufotang Formation is between immature and low mature stage; while that of the Yixian Formation, low to mature stage. The mudstone from upper Yixian Formation is medium-good source rock of Ⅱ1-Ⅱ2 types of organic matter, which provides basic data for further oil-gas exploration in Xiushui Basin.
2018 Vol. 27 (2): 186-191 [
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192
LOG CURVE NORMALIZATION OF C-6 OIL-BEARING FORMATION IN HAIZITA AREA, ORDOS BASIN
LI Xin-wei, DU Yan-jun, XI Jian-zhen, ZHANG Xu, REN Yu-jie
The Yanchang Formation is derived from continental delta facies in Ordos Basin with C-6 oil-bearing formation as the main reservoir. During the normalization of log curves, the log responses of non-permeable layer are quite different due to the influence of sedimentary environment and organic content in mudstone, which eventually leads to the lack of marker layer with stable log responses. Under this situation, on the basis of the construction of virtual marker bed by means of curves like gamma ray, caliper logging, acoustic logging and induction logging, the ΔlgR method is used to remove the impact of organic matter in non-permeable layers, and then to select a "virtual marker bed" unaffected by borehole conditions, lithology, physical properties and oil-gas potential. Finally, the histogram translation is applied in normalization of logging curves followed by test with the porosity-calculated model. The results show that the ΔlgR method is an effective way to eliminate the effect of organic content in non-permeable layer and to improve the construction quality of the"virtual marker bed" in continental strata, which also lays foundation for later determination of reservoir parameters.
2018 Vol. 27 (2): 192-198 [
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199
EFFECT OF GROUNDWATER HEAT PUMP SYSTEM ON WATER QUALITY AND MICROORGANISM
YU Hui-ming, YANG Ze, DU Ji-zhong
To study the effect of groundwater heat pump(GWHP) on groundwater environment, including hydrochemistry, water quality and microorganism, the paper analyzes the data from the interjection wells at regular intervals from July 2013 to October 2015 at a GWHP monitoring site in Shenyang. The result shows that GWHP has certain influence on the chemical types of groundwater (changing from the initial HCO
3
·SO
4
-Ca·Mg to early HCO
3
·SO
4
·Cl-Na·Ca, then to later HCO
3
·SO
4
-Na·Ca·Mg during the monitoring process) and growth velocity of microorganism controlled by temperature; the effect on the concentration of stable chemical compositions is little, while the concentration fluctuations of "three-nitrogen", Fe and Mn lead to the slight change of groundwater quality grade. Therefore, it is necessary to strengthen the effect monitoring of GWHP on groundwater environment.
2018 Vol. 27 (2): 199-203,191 [
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204
CORRELATION STUDY ON NATURAL GAS HYDRATE AND HYDROCARBON ACCUMULATION
XIN Shi-Yin
Study on the forming mechanism and distribution of natural gas hydrate (NGH), its identification marks in present and geological history, and correlation with hydrocarbon accumulation indicates that NGH is well developed in accretionary wedges of active epicontinental subduction zones and fault-fold belts of passive continental margin. The identification marks include bottom simulating reflector (BSR), special authigenic carbonate rock minerals, local deposition destruction or mass transport complex (MTC) without transportation, large circular sag and huge submarine slide. The coexisting relations between NGH and hydrocarbon accumulation are shown in the following types:The exogenous NGH is sourced by leakage or cracking of deep reservoirs. Paleo-NGH is favorable for the preservation and accumulation of shale gas. The decomposition of paleo-NGH can provide gas sources for shallow reservoir.
2018 Vol. 27 (2): 204-208 [
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34
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