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2018 Vol.27 Issue.6,
Published 2018-12-31
503
DIVISION AND SIGNIFICANCE OF THE PRECIOUS FOSSIL-BEARING BEDS OF JIUFOTANG FORMATION IN SIHEDANG AREA, LIAONING PROVINCE
GAO Fu-liang, JIANG Yang, PAN Yu-qi, WANG Xuan, WU Zi-jie, FAN Shuo, DAI De-yu
The Jiufotang Formation in Sihedang area of Lingyuan City, Liaoning Province, is rich in Mesozoic Jehol Biota fossils, most of which are precious. Through section measurement, fossil collection and field survey, the formation is divided into three members, in which the distribution of fossil beds and occurrence horizon of significant fossils are determined, namely, Hanjiagou Bed in the first member, Saerdaowan Bed in the second member and Sihedang Bed in the third member. This result promotes the research level of the study area.
2018 Vol. 27 (6): 503-507 [
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508
ANALYSIS ON THE GRAIN SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE PLEISTOCENE RED CAVE DEPOSITS IN JINYUANDONG, DALIAN
YANG Cong-ning, ZHANG Ge, LIU Si-zhao, LIU Xiao, WANG Heng-wei
he LS13320 laser diffraction particle size analyzer is used to analyze the grain size of speleothem in Jinyuandong. The measured data are generated to grain size frequency curves by the Grapher software to calculate the parameters for the study of grain-size characteristics and sedimentary environment of the Pleistocene red cave deposits. The results show that the silt content dominates the size composition, with average value of 50.14%, among which the fine silt is more than coarse silt, followed by clay content, and the sand content is the least. The grain size frequency curves of sediment samples demonstrate multimodal. Based on the calculation of particle size parameters, it is inferred that the sedimentary environment is dominated by wind deposition, which is then transported by running water, yet the compositions of sediments haven't changed significantly, reflecting the weak hydrodynamic force. The material sources are mainly influenced by climate, mostly proximal deposit in dry-cold and far-source deposit in warm-humid environments.
2018 Vol. 27 (6): 508-513 [
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514
FORMATION ENVIRONMENT AND DISTRIBUTION OF ORGANIC-RICH SHALES IN YUNNAN PROVINCE
CHENG Yong, NIE Qi, XIA Jian-bo, GU Hua-yu, WEN Yi-ming, LU Ping, LIU Cong
The geological background, forming ages and characteristics, target strata, forming environment and distribution regularity of shales in Yunnan Province are studied on the basis of a large number of literatures. The results show that the exploration should focus on the Lower Cambrian Qiongzhusi Formation, Lower Silurian Longmaxi Formation, Upper Silurian Yulongsi Formation and Upper Triassic Xujiahe Formation. The potential shales of Qiongzhusi Formation formed in the continental shelf environment are mainly distributed in western, north central, eastern, northeastern and southeastern Yunnan, while those of Longmaxi Formation are only occurred in western, north central and northeastern areas due to large-scale regression. With the continuous large-area regression in the east and northeast, the potential shales of Yulongsi Formation are confined to Qujing-Malong-Kunming-Chengjiang areas, and those of Xujiahe Formation formed in continental environment mainly in the central subarea and Lanping-Simao area.
2018 Vol. 27 (6): 514-521 [
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522
MIDDLE JURASSIC GRANITES IN HUOLONGMEN AREA, NORTHEASTERN DAXINGANLING MOUNTAINS: Zircon U-Pb Age, Geochemistry and Tectonic Implications
XU Wen-xi, LI Cheng-lu
The Huolongmen area, tectonically located at the junction of Songnen and Xing'an blocks in the eastern Daxinganling-Mongolian orogenic belt, is dominated by the Late Paleozoic granite with a certain amount of Mesozoic granite, lithologically composed of monzogranite, granodiorite, quartz monzonite and alkali-feldspar granite. The zircon U-Pb age of 175.2±2.2 Ma of the monzogranite indicates the Middle Jurassic formation. The major elements of the rock are characterized by high K, rich Na, slightly rich Al, low Mg, and poor P and Ca. The trace elements show obvious enrichment of U, Th, Zr, Ta and Rb, and depletion of Ba, Sr, Nb, P and Ti. The REE content is relatively low, enriched in LREEs and depleted in HREEs with weak negative Eu anomaly and high degree of fractionation. The granites generally belong to high-K calc-alkaline series. The R
1
-R
2
and Rb-(Yb+Nb), Rb-(Yb+Ta) diagrams reflect that the Middle Jurassic granite was formed in the tectonic environment from syn-collision to postorogenic stage. Combined with the distribution characteristics and tectonic setting of regional granites, it is thought that the Middle Jurassic granite in the study area was a product of continent-continent collision after the closure of Mongolia-Okhotsk Ocean.
2018 Vol. 27 (6): 522-530 [
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531
LA-ICP-MS ZIRCON U-Pb DATING AND GEOCHEMISTRY OF WOLONGQUAN INTRUSION IN GAIZHOU, SOUTHERN LIAONING PROVINCE
LIU Wen-bin, PENG You-bo, ZHAO Chen, CUI Yu-song, YANG Cheng-hui, WEN Cong
The Wolongquan intrusion, distributed in Wolongquan Town, Gaizhou City of southern Liaoning Province, is lithologically composed of mainly porphyritic biotite monzogranite, with the LA-ICP-MS zircon U-Pb age of 1888.4±5.3 Ma, forming in the Paleoproterozoic. The geochemical characteristics of the rock body show that the average value of Na
2
O/K
2
O is 0.70, belonging to high-K calc-alkaline series. The average Rittmann index σ of 2.18 also indicates calc-alkaline series. The A/CNK ratio is averagely 1.16, representing a peraluminous type. The average of total REE content is 299.04×10
-6
with right-dipping distribution patterns, characterized by moderately negative Eu anomaly with enrichment of LREEs and depletion of HREEs, enriched LILEs and depleted HFSEs, which are the features of active continental margin calc-alkaline series, belonging to the syn-collision I-type Cordillera granite. From the above, it can be inferred that the intrusion should be related to the thickening and melting of the lower crust caused by Paleoproterozoic orogeny.
2018 Vol. 27 (6): 531-539 [
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540
STUDY ON THE FLUID INCLUSIONS OF NANLONGWANGMIAO GOLD DEPOSIT IN QINGYUAN, LIAONING PROVINCE
NIE Xi-tao, ZHANG Ya-jing, HUO Liang
The Nanlongwangmiao gold deposit is occurred in the northeast of Qingyuan Group supracrustal rocks in the northern margin of North China Craton. The main host rock is Neoarchean magnetite quartzite with Hulutougou-Dahanggou ductile shear zone as the ore-controlling structure. The ore is veinlet-disseminated structure dominated with the main alteration types of muscovitization, silicification, chloritization, carbonatization and epidotization. The analysis results on the petrography and microthermometry of fluid inclusions in the veinlet-disseminated quartz ore show that there are two stages of fluid inclusions. The early stage forms the daughter mineral-bearing three phrase inclusions (I); while the later stage involves the gas-liquid inclusions (II), pure CO
2
inclusions (III) and CO
2
-bearing three phase inclusions(IV). The course of fluid evolution is as follows:The early-stage fluids with medium temperature, high salinity and intermediate density extract Au from the supracrustal rocks of Qingyuan Group, and then turn into moderate-low salinity and low density during the transformation of shear zone from ductile to brittle deformation at the later stage. The Au element reaches saturation and precipitates in favorable structural space to form deposit. The mineralization gradually changes from diffusion metasomatism to filling, forming veinlet-disseminated and gold-bearing pyrite quartz-vein orebodies respectively.
2018 Vol. 27 (6): 540-545 [
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546
STUDY ON THE GEOCHEMICAL CHARACTERISTICS AND ORE-FORMING FLUIDS OF HENANZHUANG GOLD DEPOSIT
LI Zhao-yi, CHEN Shou-yu, LI Sheng-li, CHEN Jun-lin, TIAN Guang-li, ZAN Pei
The Henanzhuang Gold Deposit is located on the Qinling tectonic belt in southernmost North China Plate with the host rock of a set of calc-muddy carbonate rock formation. The mineralization is controlled by strata and structure. The sources and metallogenic conditions of ore-forming fluid are studied by analyzing the trace, rare earth elements and C-H-O-S isotopes. The results show that the ore-forming fluid derived from magma is affected by later metamorphism and sedimentary reformation. The C and partial O elements come from the dissolution of marine carbonate, and catalyze the enrichment of Au. The S isotope and trace elements data indicate the deposit was formed in the anoxic reducing environment with the ore-forming fluid derived from deep crust or mantle. The geological and geochemical characteristics of the Henanzhuang Gold Deposit are similar to those of altered rock-type gold deposits, thus it should be classified as the latter.
2018 Vol. 27 (6): 546-553 [
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554
STUDY ON THE MINERALOGICAL DIFFERENCES BETWEEN LAOS STONE AND SHOUSHAN STONE
GU Yang-jian, ZHOU Yao-qi, WANG Cui-zhi, YAN Qi, ZHOU Teng-fei, LI Man-jie
A comparative study on the mineralogical differences of Laos stone and Shoushan stone is conducted on the basis of their petrography. The electron microprobe and X-ray powder diffraction are used to analyze the types and contents of chemical elements in stone samples and mineral compositions respectively. The results show that the mineralogical differences mainly lie in colors and compositions. The colors of Laos stone are mainly red, white, pink, and rarely yellow; while those of Shoushan stone are greatly varied with red, white, pink, purple, yellow, green etc. for different varieties. The change of Fe content could account for the difference. The higher the Fe content is in the stone, the darker the color is. The major mineral compositions of both gemstones are roughly the same, mainly consisting of dickite, kaolinite and nacrite, yet slightly differ in mineral contents and types. The mineral compositions of different varieties of Shoushan stone have a little difference, for example, pyrite and pyrophyllite are occurred in Shoushan Hukou stone, which is not seen in Laos stone.
2018 Vol. 27 (6): 554-565 [
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566
ANALYSIS ON THE RESERVOIR CHARACTERISTICS OF CENOZOIC WATER-GAS RESOURCES IN WEIHE BASIN AND PROBLEMS IN RESEARCH
XIE Qing, ZENG Zhong-cheng, ZHANG Ruo-yu, WANG Tian-yi
The Weihe Basin, located on Ordos block to the north and Qinling orogenic belt to the south, is a typical graben basin with complex tectonic activities, thickly-bedded Cenozoic strata and rich resources. Based on the drilling-logging data, field investigation, experiment analysis and previous research results, the Cenozoic strata in the basin is redivided and the water-gas resource types and reservoir characteristics are analyzed in depth. The results show that the basin is rich in water-gas resources, including mainly geothermal (water), mineral water, ground water, water soluble gas, biogas, helium, radon and hydrogen. The aquifers are of mainly Paleogene and Neogene bedrock fissure-pore and Quaternary gravel pore types with good water-bearing property. The Honghe, Bailuyuan, Koujiacun-Lengshuigou and Lantian-Bahe formations serve as the major geothermal reservoirs, mostly with mesopore and medium permeability, showing generally good properties. As for the gas reservoir, in addition to the thermal reservoirs, there is the Zhangjiapo Formation with good physical property, belonging to high quality reservoir. Finally, the problems existed during the water-gas resources research in the study area are analyzed as well.
2018 Vol. 27 (6): 566-572 [
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573
THERMAL RESPONSE TEST AND RESULT ANALYSIS OF TYPICAL GEOTECHNICAL COMBINATIONS OF SHENYANG CITY
YANG Ze, YU Hui-ming, MA Hong-wei, CUI Jian
Geotechnical thermal parameters, which directly represent the formation thermal response characteristics, are major factors influencing the design of ground source heat pump system. The thermal response test is one of the important means to obtain the parameters. According to the different geomorphic units in Shenyang City, 5 groups of thermal response tests are carried out for 3 typical geotechnical combinations to analyze the comprehensive thermal response characteristics as initial temperature, complex thermal conductivity and ground temperature recovery time of formation. It is suggested that ground source heat pump should be developed first in the western region of the city. The above results will provide references for the planning and utilization of ground-source heat pump system in Shenyang.
2018 Vol. 27 (6): 573-578 [
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579
STUDY ON THE HARM OF DESERT SECTION ON TRANSMISSION PROJECTS AND COUNTERMEASURES
SONG Guo-xin
It is inevitable to cross desert for the transmission line project. Suggestions on route selection in the desert section of one transmission line project in Northwest China are put forward in terms of pole-tower location, foundation form selection, wind break and sand fixation. Some countermeasures for preventing and controlling wind-sand hazards are proposed as well. The methods and measures are proved to be reasonable, and the lines also run well.
2018 Vol. 27 (6): 579-581 [
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582
DETERMINATION OF Pb, Sn, Mo AND V CONTENTS IN THE REGIONAL GEOCHEMICAL SAMPLES BY EMISSION SPECTROMETRY
WU Xiao-meng
To determine the Pb, Sn, Mo and V contents in the regional geochemical samples by emission spectrometry, select a mixture of potassium pyrophosphate, sodium fluoride, aluminum oxide and carbon powder as solid buffer, Ge as the internal standard element, and also appropriate analysis line pairs and national first-level geochemical standard materials (GBW stream sediments and soil) for parallel determination(n=12). The test results show that the accuracy meets the specification and test requirements of regional geochemical samples.
2018 Vol. 27 (6): 582-585 [
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586
EVALUATION ON THE GEOLOGICAL RELIC RESOURCES OF MESOZOIC FOSSILS IN JIANCHANG, LIAONING PROVINCE
WU Zi-jie
Jianchang County of Liaoning Province, an important geological relic concentration of Mesozoic fossil in China, is rich in fossils of Yanliao Biota, Jehol Biota and Fuxin Biota. The qualitative evaluation on the typicality, primitiveness and scarcity determine their value in scientific research, popular science, social and economic aspects. Then the quantitative evaluation further divides the relic sites into Level I, II and III. Finally, the comprehensive evaluation classify the fossil concentrations as National and Local Level, which provides scientific basis for protection planning, reserve division and development and utilization of fossils in Jianchang.
2018 Vol. 27 (6): 586-592 [
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