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2022 Vol.31 Issue.2,Published 2022-04-25
123 THE NEOPROTEROZOIC GRANITIC GNEISS IN CHAOMAN FOREST FARM AREA OF DAXINGANLING MOUNTAINS: Zircon U-Pb Dating, Geochemistry and Tectonic Environment
YU Xi-huan, LI Xin-peng, CHEN Xu-feng, SUN Jiang-jun, YIN Guo-liang, DING Ji-shuang, DU Shi-zhuo
The study on the petrology, geochemistry, genesis and tectonic environment of Neoproterozoic granitic gneiss in Chaoman Forest Farm area of Daxinganling Mountains yields the age of 795.2±4.3 Ma. The granitic gneiss is characterized by high Si, high alkali, rich Ca, Na and K, enrichment of LREEs and depletion of HREEs, with weak negative Eu anomaly and depletion. The magma source area is mainly crust-derived magma, and some mantle-derived magma underplating causes partial melting of rocks in the middle-lower crust, with hybridization of mantle-derived components to form mixed magma. Combined with regional data, the Neoproterozoic granitic gneiss in the study area was formed in a magmatic arc environment related to subduction.
2022 Vol. 31 (2): 123-130 [Abstract] ( 108 ) [HTML 1KB] [ PDF 599KB] ( 209 )
131 CHARACTERISTICS OF THE LATE PERMIAN SPOROPOLLEN ASSEMBLAGES FROM HFD1 WELL IN NORTHERN SONGLIAO BASIN: Geological Implication
ZHANG De-jun, ZHENG Yue-juan, ZHANG Hai-hua, HUANG Xin, ZHANG Jian, CHEN Shu-wang, LI Yu-ke
The sporopollen assemblage of Protohaploxypinus-Piceaepollenites Opimus-Alisporites Communis, collected for the first time in the Upper Permian Sizhanbanyan Formation from HFD1 well in northern Songliao Basin, is dominated by the pollen of gymnosperms, while pteridophytes are characterized by low spore content and poor species. Of the pollen contents of gymnosperms, non-striate bisaccate pollen is the highest, followed by striate bisaccate pollen, with less monosaccate pollen, which are comparable with the sporopollen assemblages of the Late Permian in Junggar and Tarim basins in Xinjiang and the Linxi Formation in Daxinganling Mountains, indicating the age is also Late Permian. As the lithologic characteristics of the strata with sporopollen assemblages are similar to those of Linxi Formation, the Linxi Formation of Daxinganling Mountains on the west of Songliao Basin can be introduced to replace the former Sizhanbanyan Formation.
2022 Vol. 31 (2): 131-140 [Abstract] ( 131 ) [HTML 1KB] [ PDF 646KB] ( 171 )
141 PETROGRAPHY AND GENESIS OF THE EARLY CRETACEOUS DOSEMIC RHYOLITE PORPHYRY IN CHIFENG CITY, INNER MONGOLIA
ZHONG Hui, LIU Xin, ZHANG Yu-jin, WU Yue
The Early Cretaceous dosemic rhyolite porphyry in Shuangsheng area of Chifeng, Inner Mongolia, is characterized by vesicular structure and multi-porphyritic texture, with 70% of phenocryst content, including sanidine(30%), quartz(35%)and plagioclase(5%). The sanidine phenocryst shows subhedral wide tabular structure with comb-like reaction rim, which is composed of Na-orthoclase and contains needle-columnar mineral crystallite. The edge or interior of the quartz phenocryst is strongly corroded, where porphyroclastic texture is developed, with the characteristics of "cracked or dispersed but not separated". Matrix components are filled in between the quartz porphyroclasts. The rock contains vesicles, showing the dual structure of lava and porphyroclastic lava. The structure characteristics of the rock reflect a rapid uplift process with adiabatic-decompression of magma, probably indicating the beginning of regional extensional tectonic setting in diagenetic period.
2022 Vol. 31 (2): 141-147 [Abstract] ( 81 ) [HTML 1KB] [ PDF 693KB] ( 164 )
148 ZIRCON GEOCHRONOLOGY FOR SEDIMENTARY ROCKS OF NANXIONG GROUP IN CHANGTIAN AREA, NORTHEAST GUANGDONG: Geological Implication
TANG Cong, PAN Jia-yong, MIN Zhuang, HUANG Guang-wen
Changtian Basin is one of significant energy basins in Guangdong Province. To learn the geological structure, sedimentary material characteristics and tracer sandstone provenance in detail, microscopic identification, electron probe microanalysis(EPMA)and laser ablation inductively coupled plasma mass spectrometer(LA-ICP-MS)are used to systematically study the typical sandstones of Nanxiong Group in Changtian Basin on the basis of field geological survey. The results show that the Upper Cretaceous Nanxiong Upper Subgroup is mainly composed of(carbonaceous)lithic quartz sandstone, followed by calcareous sandstone, (argillaceous)siltstone, fine sandstone, conglomerate and greywacke, generally developed with obvious secondary changes and metallization. The analysis of detrital zircons from Nanxiong Group reveals that most of the zircons in the samples have perfect oscillatory bands with Th/U values usually greater than 0.4, indicating the zircons are mainly of magmatic crystallization origin, with a few metamorphic zircons of complex origin. The U-Pb concordant ages can be roughly divided into five groups: 2506-1666 Ma, 1815-941 Ma, 510-434 Ma, 308-234 Ma, and 172-99 Ma, which correspond to the known tectonic events in northeast Guangdong, reflecting that the tectono-magmatic activities in the study area are mainly controlled by the magmatic activities in eastern China, with the characteristics of episodic development and evolution. Based on the systematic analysis of lithography, zircon U-Pb age and REE characteristics of clastic rocks from Nanxiong Group, and comparison with the possible provenance, it is concluded that the detrital materials were mainly derived from Mesozoic magmatic intrusions in the western margin of Changtian Basin.
2022 Vol. 31 (2): 148-155 [Abstract] ( 68 ) [HTML 1KB] [ PDF 703KB] ( 216 )
156 THE FIRST-ORDER MATALLOGENIC UNITS IN HEILONGJIANG PROVENCE: New Division of Metallogenic Domain
ZHANG Tie-an, LIU Yu-qi, GAO Hong-yan, DU Bing-ying, LI Cheng-lu, LIU Yu-wei, LIU Ming-wei, WANG Xu-nan, ZHAO Yu-sheng
In view of the demand of geological and mineral resources work and research for the geodynamic background of minerals of various ages in Heilongjiang Province, based on the research progress of basic geology in Heilongjiang in the past 30 years, according to the latest tectonic division plan of the province, the first-order metallogenic units(metallogenic domain)are redivided as follows: Paleo-Asian Ocean metallogenic domain(Pt3-P1), Paleo-Asian Ocean and Paleo-Pacific Ocean superimposed metallogenic domain(D1-P3), Mongolia-Okhotsk Ocean metallogenic domain(P2-early K1), Paleo-Pacific metallogenic domain(D1-K1), and marginal-Pacific metallogenic domain(K2-Q). The discussion on the influence time limit and scope of each first-order metallogenic unit(metallogenic domain)provides new thought for the ore prospecting in Northeast China.
2022 Vol. 31 (2): 156-164 [Abstract] ( 57 ) [HTML 1KB] [ PDF 784KB] ( 213 )
165 THE SOURCE ROCKS OF HONGSHUIZHUANG FORMATION IN LINGYUAN AREA OF LIAOXI DEPRESSION: Petroleum Geology and Hydrocarbon Generation Potential
ZONG Wen-ming, SUN Qiu-shi, GAO Xiao-yong, ZHENG Lei, SHI Lei, LI Yong-fei, SUN Shou-liang, ZHANG Tao
The shale of Hongshuizhuang Formation is the dominant source rock of Yanliao rift belt with good hydrocarbon generation potential. However, the study of Hongshuizhuang Formation in Liaoxi Depression is relatively weak, which restricts the study of Meso-Neoproterozoic oil-gas geological conditions and exploration in this area. To reveal the hydrocarbon generation potential and oil-gas preservation conditions of source rocks in the area, geochemical analysis is carried out for samples from LLD2 well and 3 sections in Lingyuan area. The results show that the source rocks of Mesoproterozoic Hongshuizhuang Formation generally have high organic abundance and good hydrocarbon-generating material basis. The organic matter is mainly Ⅰ-Ⅱ1 type, partly Ⅱ2 and Ⅲ types. The Ro distribution ranges from 1.15% to 2.26%, belonging to mature-high mature stage, and some samples are over-mature, which are comprehensively evaluated as medium-good source rocks with good hydrocarbon generation potential. The Hongshuizhuang Formation in Lingyuan area serves as source bed located in favorable reservoir facies belt and can compose two sets of complete source-reservoir-cap assemblages, showing good oil-gas exploration prospects.
2022 Vol. 31 (2): 165-174,196 [Abstract] ( 79 ) [HTML 1KB] [ PDF 1060KB] ( 161 )
175 REMOTE SENSING GEOLOGICAL INTERPRETATION AND ORE-CONTROLLING REGULARITY OF LINE-RING STRUCTURES IN BEIJING-TIANJIN-HEBEI REGION
LU Ke-xuan, LIU Xin-xing, ZHANG Juan, CHENG Jia-wei, GAO Chun
Linear and ring structures are closely related to the formation of mineral resources. With obtained Landsat 8 OLI remote sensing images, the geological interpretation for linear and ring structures is carried out on the basis of geological background and mineral data collection in Beijing-Tianjin-Hebei region. The ArcGIS is used to analyze the buffer zones of linear and ring structures and their intersections in the study area. According to the image features of linear and ring structures and their relationship with distribution of ore occurrences, the ore-controlling regularities and models of line-ring structure are summarized, which can provide a basis for remote sensing prospecting and delineation of metallogenic prospects.
2022 Vol. 31 (2): 175-182 [Abstract] ( 77 ) [HTML 1KB] [ PDF 785KB] ( 225 )
183 EVALUATION ON THE SOIL QUALITY AND SUITABILITY OF GREEN FOOD PRODUCING AREA IN NEHE CITY OF HEILONGJIANG PROVINCE
ZHANG Zhe-huan, YANG Jia-jia, SONG Yun-hong, HE Peng-fei
Based on the 1∶250 000 land quality geochemical survey data of black land in Northeast China, the soil nutrients, soil environmental quality, comprehensive soil quality and suitability of green food producing area in Nehe City are evaluated according to the Soil Quality Geochemical Evaluation Standard and Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (Trial). The results show that there is fertile land and clean environment in Nehe City, which is suitable for the development of green agriculture. Among the 16 indexes, including N, P, K, organic matter, CaO, MgO, Fe2O3, S, B, Zn, Mn, Cu, Mo, Co, Ge and V, except Cu and Zn are relatively deficient, Ge and B deficient, the others are rich or relatively rich. The comprehensive soil nutrient grades are mainly rich and medium, with distribution areas of 3 666.74 km2 and 2 574.11 km2, accounting for 56.94% and 39.97% of the total area respectively. The soil environmental quality is dominated by Grade Ⅰ(risk free), covering an area of 6 435.78 km2, accounting for 99.94% of the total; while the Grade Ⅱ(risk controllable)area is only 4 km2, occupying 0.06%. The comprehensive soil quality is largely fine-grade soil, covering 3 806.06 km2 and accounting for 59.11% of the total area, with the good-grade of 2 574.11 km2(39.97%)and medium-grade of 59.61 km2(0.92%), no poor- and inferior-grades soil. The soil area conforming to Grade-AA green food production area is 6 461.5 km2, accounting for 97.5% of the total area, that conforming to Grade-A 38.1 km2(0.58%), and that does not meet the requirements is 65.6 km2(0.99%).
2022 Vol. 31 (2): 183-192 [Abstract] ( 71 ) [HTML 1KB] [ PDF 992KB] ( 212 )
193 GEOCHEMICAL EVALUATION OF LAND QUALITY IN GAOQIAO TOWN, CENTRAL YUNNAN
XU Jie, XIANG Jing-wei, WANG Hao-yu
A total of 453 topsoil samples are collected at a density of 1.12 cores per square kilometer in Gaoqiao Town of Wuding County. The heavy metal elements such as As, Cr, Cd, Cu, Hg, Pb, Ni and Zn are evaluated for soil environment geochemistry. The soil quality is assessed as first and second grades, with the first-grade area of 350 km2, accounting for 84.95%, and the second-grade area of 62 km2, making up 15.05%. Cu and Cd in some parts of the area show abnormal but do not reach pollution levels. The contents of nutrient elements such as N, P and K are evaluated for soil nutrient geochemical grading, with about 378 km2 above medium level, occupying 91.74%. The nutrient-deficient parts are close to densely-populated area, therefore it is inferred that the evaluation unit is seriously affected by human activities. From the above, the land quality geochemical evaluation for Gaoqiao Town shows a relative balance, with high-quality area about 101 km2, accounting for 24.51%, good area 224 km2 (54.37%), medium area 80 km2 (19.42%), and no inferior area.
2022 Vol. 31 (2): 193-200 [Abstract] ( 62 ) [HTML 1KB] [ PDF 1015KB] ( 195 )
201 ANALYSIS OF SLOPE STABILITY BASED ON ROCK MASS QUALITY GRADE EVALUATION: A case study of Xiahekou-Lagushao road section in Kuandian area of Liaoning Province
YAN Xiang-jin, HUANG Wei, REN Chuan-tao
The rock mass quality is divided into different grades on the basis of qualitative analysis of rock mass quality and quantitative analysis of related indexes. According to the different quality grades, the slope stability along Xiahekou-Lagushao road section is analyzed by rock mechanical properties. The results show that the joints of intrusive rock group (quartz monzonite, quartz syenite) and metamorphic rock group (migmatite) have minor influence on the slope instability failure. The weathering and poor integrity of metamorphic rock mass (gneiss) reduce the slope stability. The weathering degree, integrity degree, structural characteristics, occurrence and extensibility of structural planes are the major factors affecting the slope stability, with multiple modes of slope failure and degree.
2022 Vol. 31 (2): 201-205,220 [Abstract] ( 56 ) [HTML 1KB] [ PDF 939KB] ( 276 )
206 DAMAGE CAUSES AND STABILITY EVALUATION OF EXTREMELY HIGH REMOTE DANGEROUS ROCK GROUP: A case study of Wufeng Mountain area in northeast Yunnan
HU Jun-chun, PENG Jun, CHEN Zhi-jun, JIAO De-guang
Extremely high remote dangerous rock collapse is characterized by suddenness, fast speed, great potential energy, severe destruction force, strong impact and wide influence range. Five dangerous rock blocks are located on the southern slope of Wufeng Mountain in Zhenxiong County, northeast Yunnan. The strata are near horizontal and the topographic slope of collapse area is above 70°. The bare area of bedrock is 0.07 km2 in collapse and dangerous rock area, with the height difference of 222 m from slope toe to top, the average height difference of 159 m for dangerous rock mass, and the maximum horizontal displacement of rockfall of 216 m, belonging to typical extremely high remote dangerous rock group. The qualitative and quantitative methods are used to comprehensively analyze 10 basic influencing factors of dangerous rocks and evaluate the stability combined with internal and external conditions. The results show that the five dangerous rocks have poor stability with the toppling-type damage mode. The high-speed remote dynamic collapse easily generates debris flows, which impact and flow in high speed as scattered fans. The large bare area and fragile eco-environment are in urgent need of treatment.
2022 Vol. 31 (2): 206-213,242 [Abstract] ( 86 ) [HTML 1KB] [ PDF 1090KB] ( 200 )
214 SPATIAL DISTRIBUTION AND MORPHOLOGICAL CHARACTERISTICS OF LOESS LANDSLIDE IN ZHIDAN COUNTY, SHAANXI PROVINCE
LI De-shen, HE Zhi-yuan, KONG Jia-xu, ZHAO Li, WU Meng, MU Jia-qi, ZHENG Jia
The spatial distribution and morphological characteristics of landslides can reflect their development degree and provide a basis for landslide prevention in the region. Taking the loess landslide in Zhidan County as the study object, the nearest neighbor index (NNI) and kernel density estimation (KDE) are selected based on GIS to analyze the spatial distribution regularity of landslide. The morphological characteristics of landslide are studied through statistical analysis. The results show that the INNI value of the study area is about 0.177, with aggregated distribution of landslide in space. The maximum KDE value distributes in the slopes on both sides of Zhouhe River in belts with multiple high-density areas. The calculated landslide area density and point density are 0.26% and 0.19 per square kilometer respectively. The slope gradients of landslide are generally above 70°, the aspects mainly concentrated in south and southeast, and the slope heights mostly below 40 m. The landslide in the study area can be classified into three different morphological types by angle, height and geological environment characteristics through cluster analysis.
2022 Vol. 31 (2): 214-220 [Abstract] ( 155 ) [HTML 1KB] [ PDF 932KB] ( 191 )
221 ZONING EVALUATION OF MINE GEOLOGICAL ENVIRONMENT IN XUCHANG CITY, HENAN PROVINCE
SONG Gao-ju, HUANG Ji-chao, ZHANG Gong, WANG Shuai
Taking slope unit as evaluation unit, through establishing the evaluation index system of three factors including regional geological environment background, resource damage and geological hazard, the evaluation indexes are quantified and weighted to make the zoning evaluation of mine geological environment in Xuchang City by layer overlapping analysis of GIS technology. The zoning results are consistent with the current survey, which verifies the practicability of the method and provides reference for planning and treatment of mine geological environment in the area.
2022 Vol. 31 (2): 221-227 [Abstract] ( 85 ) [HTML 1KB] [ PDF 984KB] ( 214 )
228 GIS-BASED QUALITY EVALUATION OF UNDERGROUND SPACE RESOURCES IN YANGTZE RIVER DEMONSTRATION DISTRICT OF WUHAN CITY
XIONG Feng, JIANG Dan, WU Pin-lei, PANG She-dian, GUAN Shan-you
The underground space development is a hot spot in urban construction currently. To serve the planning and construction of underground space in Yangtze River Demonstration District of Wuhan City, based on a large number of basic data and results obtained from multi-factor urban geological survey, combined with GIS technology, the paper carries out the underground space resources quality evaluation of the study area, which is shown in the zoning map of underground space resources quality of different depths. The results indicate that the quality of shallow and sub-shallow underground space resources are generally good-excellent, with the southwest side obviously inferior to the east and north sides, mainly affected by the existing underground structures, soft soil and groundwater. The quality of sub-deep and deep underground space resources are generally medium-good, mainly affected by the development depth, karst and rock excavation difficulty.
2022 Vol. 31 (2): 228-234 [Abstract] ( 114 ) [HTML 1KB] [ PDF 987KB] ( 225 )
235 DETERMINATION OF 26 ANTIBIOTICS IN GROUNDWATER BY DIFFUSIVE GRADIENTS IN THIN FILMS TECHNIQUE COMBINED WITH UPLC-MS/MS
ZHANG Ze-yu, WANG Xin, LI Li-jun, MA Jian-sheng
Antibiotic contamination in groundwater has been concerned in recent years. Due to the trace-level concentration of antibiotics, the processes for sampling, extraction and detection are highly required. The diffusive gradients in thin films (DGT) is used to establish the in situ enrichment sampling method of antibiotics in groundwater, and antibiotics such as sulfonamides, quinolones, tetracyclines and macrolides are successfully enriched. Besides, the ultra-high performance liquid chromatogrphy tandem mass spectrometry (UPLC-MS/MS) is applied for the detection method of 26 typical antibiotics in groundwater, with optimized extraction conditions. The results show that the sampling and testing methods have good enrichment effect and detection sensitivity for analysis of antibiotics in groundwater. The appropriate in-situ enrichment sampling time of groundwater is 20-30 d, with instrument detection limit of 0.002-0.074 ng/L, average recovery of 47.7%-94.6% and precision of 4.45%-10.84%. The in situ enrichment sampling method of antibiotics in groundwater through DGT is simple and can be used for trace analysis of antibiotics in groundwater combined with UPLC-MS/MS.
2022 Vol. 31 (2): 235-242 [Abstract] ( 83 ) [HTML 1KB] [ PDF 1012KB] ( 220 )
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