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2023 Vol.42 Issue.4
Published 2023-11-25
595
Petrogenesis of Middle Ordovician intermediate?acidic magmatic rocks in Xihexiu area, northern margin of West Kunlun Mountains and its tectonic setting
LIU Yuan, LI Shangqi, ZHANG Qi, WEI Bo, LI Baohui, CHANG Hao
Based on the 1 ∶ 50 000 scale mineral geological survey in the northern margin of the West Kunlun Mountains, the authors have carried out petrological, petrographic, geochemical and chronological studies on the quartz diorite and granodiorite in the Xihexiu area. The results show that the ages of quartz diorite and granodiorite are (467. 4 ± 3. 3) Ma and (462. 3 ± 2. 6) Ma, respectively, being Middle Ordovician. Quartz diorite and grano? diorite are metaluminous, belonging to high?K calc?alkaline to shoshonitic series of S?type granite, and derived from crustal complex sandstones. Combined with regional geological data and previous research results, it is believed that the formation of intermediate?acidic magmatic rocks in Xihexiu area on the northern margin of West Kunlun Mountains is closely related to the syn?collision tectonic environment after the closure of the Proto??Tethys Ocean.
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2023 Vol. 42 (4): 595-610 [
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REE geochemical characteristics and origin within fluid of Middle Permian Qixia Formation dolomites, SW Sichuan Basin
HAN Xiaotao,BAI Xinran,JIN Huijie,CHEN Jundian,REN Yi,BAO Zhengyu,ZHOU Yongjun
Based on REE geochemical characteristics of the dolomites in Zhangcun profile, Middle Permian Qixia Formation, SW Sichuan Basin were studied by combined application of X??ray diffraction (XRD) and induc? tively coupled plasma?mass spectrometry (ICP??MS). The results show that the dolomites have low non?carbonate minerals including quartzs and feldspar minerals ranging from 0 to 4. 5% . The total REE content of dolomites are low, ranging from 1. 64 to 3. 24 μg / g with the depletion of LREEs and the enrichment of HREEs. The REE pat? terns of saddle?shape dolomites normalized by post?Archean Australian shale and seawater, respectively, show ob? vious positive Eu anomaly, indicating the involvement of hydrothermal fluid.
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2023 Vol. 42 (4): 611-620 [
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621
Effect of mantle plume activity on craton lithospheric mantle:Sr-Nd-Hfisotopic constraints of mantle peridotite xenoliths of Siberian Craton
CHENG Zhe, SUN Jing
TheSr-Nd-Hfisotopic compositions of minerals in peridotite xenoliths from the Obnazhennaya kimberlite are analyzed using solution method, and compared with those from Udachnaya kimberlite. The results show that the clinopyroxenes within peridotite xenolith in the Obnazhennaya kimberlite are depleted in Sr and en? riched in Nd, Hf isotopic compositions. TheSr-Nd-Hfisotopic compositions of garnets from peridotite xenoliths in the Obnazhennaya kimberlite show primitive characteristics and are not affected by metasomatism. By comparing the characteristics of mantle xenoliths in Udachnaya and Obnazhennaya kimberlites and simulating binary mixing of cli? nopyroxenes, it is found that theSr-Nd-Hfisotopic composition of mantle xenoliths in Udachnaya kimberlite is quite similar to the characteristics of the hosting kimberlite, while theSr-Nd-Hfisotopic composition of mantle xen? oliths in Obnazhennaya kimberlite is of the character between kimberlite and basalt related to mantle plume, which is more close to the isotopic characteristics of basalt lava flow. Therefore, the mantle plume activity has an impact on the Siberian Craton lithosphere, changing the isotopic composition of its lithospheric mantle.
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2023 Vol. 42 (4): 621-635 [
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636
Li isotopic geochemical characteristics of Cenozoic alkali?rich magmatic rocks and constraints on magmatic source region in Jianchuan, western Yunnan
LIU Junpeng, WANG Die, DING Zhidan, MA Fei
The petrography, whole rock major and trace elements and Li isotope compositions of Jianchuan, Yuzhaokuai and Laojunshan plutons of Jinshajiang??Honghe alkali?rich magmatic belt in western Yunnan area have been studied. The results show that the three plutons are enriched in light rare earth (LREE) and large ion litho? phile elements (LILE), depleted in high field strength elements (HFSE) such as Nb, Ta and Ti, being of weak Eu anomalies. The δ 7 Li values of Jianchuan, Yuzhaokuai and Laojunshan plutons are 0. 70‰ - 6. 48‰, 0. 50‰ - 5. 89‰ and 3. 73‰ - 4. 28‰, respectively. Combined with previous research results, it is believed that the Yuzhaokuai intrusive has the characteristics of adakitic rocks, which is derived from the partial melting of the thick? ened lower crust and a minor amount of mafic magma is injected during melting process. Meanwhile, the middle and upper crustal materials are mixed during the upward migration of the melts. The Jianchuan and Laojunshan intrusives are the products of the magma formed by the partial melting of metasomatic enriched lithospheric mantle through continuous differentiation.
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2023 Vol. 42 (4): 636-649 [
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Chronostratigraphic time scale of fault depression strata in Songliao Basin and its geological significance
SONG Libin,ZHANG Yongqing,JIANG Hongguan,SUN Kai,WANG Chenglong,WAN Chuanbiao,ZHANG Meisheng
In order to determine the geological age of the fault depression strata in deep Songliao Basin and to solve the difficulty of stratigraphic spatial correlation in different fault depressions, the authors have sorted out the zircon U??Pb dating of volcanic rocks (volcanic ashes) in Songliao Basin and its surrounding outcrops of the faulted strata. The valid age data of the fault depression series were selected, and the chronostratigraphic time scale of fault depression strata in Songliao Basin has been established combined with the limitation by the International Chronos? tratigraphic Table. The preliminary determination on the age of the fault depression series shows that the Denglouku Formation is 105. 5??100. 5 Ma, the Yingcheng Formation is 118. 0??105. 5 Ma, the Shahezi Formation is 124. 0 ?? 118. 0 Ma, and the Huoshiling Formation is 135. 0??124. 0 Ma, respectively. This study can provide temporal crite?ria for studying the stratigraphic correlation of regional systematic layers of fault depression systems, and can be used as reference of other Cretaceous fault basins.
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2023 Vol. 42 (4): 650-661 [
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2023 Vol. 42 (4): 661-661 [
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662
deposition dispersion system: a case study of fine?grained sediments in Cretaceous Qingshankou Formation, Songliao Basin
FANG Shi,RONG Weijiang,CHEN Wei
The component fitting and separation function specifically calculated from the measured fine? grained size data of the Qingshankou Formation in Songliao Basin, showed that the fine?grained sediments are domi? nated by silts, of which 3 / 5 are transported in the form of particles, and the other 2 / 5 are transported in the form of flocculent. The dispersion system of the fine?grained sediments in Q2 sub?layer was reconstructed, and it verifies that the dispersion system is comprehensively controlled by the runoff and wind field, with the runoff dominating first.
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2023 Vol. 42 (4): 662-675 [
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676
Hydrocarbon source in Jurassic and its exploration significance in Hongqi Sag, Hailar Basin
WU Haibo,HOU Yanping,WANG Pujun,CHEN Hongping,SHEN Wenjing,PENG Wei,CHEN Chongyang
To clarify the hydrocarbon source in the Jurassic deposits of the Hailar Basin, the authors have conducted lithological and chronological corrections through borehole core and thin section identification, geochemi? cal analysis, and zircon U??Pb isotopic dating, to determine the stratigraphic age and attribution. Furthermore, an oil?source correlation was carried out using saturated hydrocarbon gas chromatography and gas chromatography?mass spectrometry to identify the hydrocarbon source. The results indicate that the oil?bearing sandy conglomerate layer encountered in the drill holes in Hongqi Sag, formerly attributed to the Lower Cretaceous Tongbomiao Formation is acturally trachytic breccia with an age of (146. 90 ± 0. 93) Ma, belonging to the Late Jurassic. There are two sources for the hydrocarbons in the Jurassic layer. The first is the Jurassic source rock located in the lower part of the hydrocarbon layer, forming a model of lower generation and upper storage. The second is the Cretaceous source rock in a lateral direction migrated to the Jurassic conglomerate layer, forming a model of upper generation, lower storage, and lateral migration. The upper generation with lower storage model indicates that the Cretaceous source rock has the potential to supply hydrocarbons and accumulate them in the underlying Jurassic reservoirs. In addition to the previous exploration focus on Jurassic intra?group and underlying source rocks, new insights for Jurassic hy? drocarbon exploration have been provided on the basis of the matching between overlying Cretaceous source rocks and underlying Jurassic reservoirs.
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2023 Vol. 42 (4): 676-690 [
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691
Development characteristics and main controlling factors of high?quality deep low?permeability sandstone reservoirs in Nanpu Sag, Bohai Bay Basin
YANG Shang, DU Jingxia, WU Linna, WEI Yaqiong, PENG Weisong, WANG Shuqin
Petrological characteristics, diagenesis, micro pore structure and reservoir properties of deep sand? stone reservoirs in Nanpu Sag are comprehensively studied by using conventional thin section, cast thin section and scanning electron microscope analysis, combined with X?ray diffraction, conventional porosity and permeability and mercury injection test data. The results indicate that the deep sandstone reservoirs in the Nanpu Sag are mainly composed of feldspathic lithic sandstone and lithic feldspathic sandstone, with effective pores being mainly com? posed of residual intergranular and intergranular dissolution pores. Type Ⅰ reservoirs are mainly distributed in Sha? 1 Member of the 3rd structure and Dong??3 Member of the 4th structure, while typeⅡreservoirs are mainly developed in Dong?3 submember of the 1st structure and Sha ??1 Member of Gaoshangpu structure. Compaction and cementa? tion of late carbonate rocks are the main causes to reservoirs with low porosity and permeability. The relatively high contents of metamorphic rock debris and quartz debris are conducive to the preservation of primary pores. Early car? bonate cementation, dissolution of feldspar fragments and intermediate?mafic volcanic rock fragments, and fractures within feldspars under compressive stress, are the three favorable factors for the development of secondary pores in deep sandstone reservoirs.
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2023 Vol. 42 (4): 691-700 [
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701
Research on sedimentary characteristics and genetic environment of lacustrine carbonate rocks of Cretaceous Barra Velha Formation in Santos Basin, Brazil
YANG Liu,FAN Guozhang,WANG Hongping,ZUO Guoping,LI Lin,WANG Chaofeng,ZHANG Yonggang,PANG Xu,DING Liangbo,WANG Siwen,LI Weiqiang,SONG Xu,HUANG Xiaojie
The mineral composition and geochemical characteristics of Cretaceous Barra Velha Formation car? bonate rocks in Santos Basin, Brazil have been analyzed by using thin sections and stable isotopes, and the sedi? mentary genetic environment of this lacustrine carbonate rocks has been discussed. The results show that the Barra Velha Formation carbonate rocks have special structural components such as calcite mud, spherulite, and shrub grain, as well as other internal debris grains, which are classified into four rock types, i. e. mud crystal, spheru?lite, shrubby granular, and grain limestones. Combing with the evidence of different viewpoints on microbiology, alkali lakes, and travertine proposed by previous scholars, a new genetic environment perspective has been pro? posed, which integrates paleotopography and fluid characteristics. It is believed that the fluid environment in which spherical and shrub granular deposits occur is characterized by high temperature and high salinity. Grains are formed in high?energy environments above the wave base, while micrite deposits are formed in low?energy environ? ments below the wave base.
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2023 Vol. 42 (4): 701-713 [
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714
Bouguer gravity anomaly inversion method constrained by well physical property and its application
LI Lili, CAO Rui, MA Guoqing, WANG Taihan, MENG Qingfa
The authors propose to increase the range of well constraints in inversion to control the strength of well constraints. By setting multiple geological body conditions and constraint inversion under different well condi? tions, the constraint effects of well data on geological body in gravity density inversion has been analyzed, and high? er resolution inversion results are obtained. This method was used to delineate six iron ore locations in an area of Shandong Province.
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2023 Vol. 42 (4): 714-723 [
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724
Radar logging data processing method and its application effect
HU Mingqi,LIU Sixin,SHI Wei,RAN Limin,LI Jianwei,DU Juan
In order to carry out data processing efficiently, the authors have proposed a set of radar logging data processing method, and a set of three?antenna radar logging data processing software has been independently developed. The radar profile with high signal?to?noise ratio is obtained through a series of processing of the meas? ured radar logging data of a mine in Yulin City, Shaanxi Province, including bad channel rejection, resampling, depth correction, DC elimination, band?pass filtering, background elimination and gain processing, etc. The pro? cessed results by wave speed and wave length show that the effective radial detection distance of the method reaches 11 m as deduced from the information of wave speed and travel time, and the broken zone anomaly can be clearly recognized at the 410??415 m well section of the antenna three radar profile, which illustrates the feasibility of the processing method.
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2023 Vol. 42 (4): 724-730 [
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731
Extraction method of urban core feature elements based on multi?feature information: a case study of Shenzhen City
LUO Xiujie,LIU Ziwei,XU Mengxia,WANG Mingchang
In order to address the issue of low extraction accuracy of urban core feature elements caused by low spatial resolution, the authors have developed convolutional neural networks (CNNs) applicable to the extrac? tion of urban core feature elements. At the same time, multi?feature information such as color, texture, and shape extracted based on remote sensing images have been used to assist the extraction of urban feature elements. The CNNs model fully exploits the high?level semantic information in the image data by combining multi?feature informa? tion, such as color, texture, and shape, with the deep information it has extracted. This combination can signifi? cantly increase the accuracy of the results. According to the experimental findings, the CNNs model decreases the number and complexity of model parameters, converges quickly, and exhibits good extraction accuracy, generaliza? tion ability, and robustness. Its overall accuracy is 97. 49% , and its Kappa coefficient is 0. 957 5. Thus, the re? search can offer technical assistance for urban planning and development.
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2023 Vol. 42 (4): 731-739 [
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740
Numerical simulation of heat transfer performance of spiral vane reinforced medium and deep geothermal coaxial heat exchanger
LUO Ji,ZHANG Yanjun,LIU Qiangbin,LI Xiaoguang,LOU Junqing
To enhance the heat transfer effect of coaxial heat exchanger in medium and deep geothermal de? velopment, a new geothermal coaxial heat exchanger in the form of spiral vane is proposed. By establishing a nu? merical model of the heat exchanger with interpolated spiral blades of different spacing (d = 200, 150, 100 mm), the heat transfer fluid characteristics in the casing are simulated. The results show that under the turbulent flow state of Re = 4 500??11 500, the spiral blades as a disturbing element can effectively strengthen the single?phase convective heat transfer effect of the heat exchanger and improve the ability to extract heat from the rock and soil body by changing the flow pattern of the fluid and the thickness of the thermal boundary layer. As the spacing d de? creases, the enhanced heat exchange effect is further enhanced and the Nusser number (Nu) increases. When the spacing d is 100 mm, the enhanced heat transfer effect is the best and the comprehensive heat transfer capacity is the strongest, with Nu increased by 41. 05%??44. 18% compared with that of smooth tube, and the heat transfer enhancement factor TEF is 1. 16. This work provides a theoretical basis for the optimal design of coaxial casing heat exchanger.
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2023 Vol. 42 (4): 740-748 [
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749
Geochemical characteristics of heavy metals in black soil peri?urban area and its evaluation of ecological risk
GAO Wanying, WANG Dongyan, WANG Xingjia, JIN Xiaotong, LU Jiaxi
The elements of Cu, As, Pb, Zn in the soil?crop system of the peri?urban area of Changchun City has been selected, where is located in the typical black soil region of Northeast China. With Pearson correlation analysis and the influence index of comprehensive quality, the characteristics of geochemistry and ecological risk of soil?crop system have been evaluated. The results indicate that there is obvious accumulation of heavy metals in sur? face soil, and none of the heavy metal contents of crop grains exceeds the risk value. The absorption and accumula? tion of Cu and Zn by crop grains are significantly higher than As and Pb. Different heavy metal transport capacity in different soil?crop system may be related to crop species, pH values, TOM, N, P and K2O contents. The spatial distribution characteristics of the bioaccumulation factor were similar to crop grains, but different from soil. The IICQ ranges from 0. 13 to 4. 44, with a average of 0. 62. The soil environment quality is good in the study area, with only a small circular part in the central area being of ecological risk.
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2023 Vol. 42 (4): 749-760 [
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761
Evaluation of ecological sensitivity in Yanbian area of Jilin Province based on random forset algorithm
JI Dongmei,LI Shujie,SUN Jianhua
Taking the Yanbian area of Jilin Province as the research object, random forest classification was introduced to train data and establish a model for ecological sensitivity evaluation. Among the five factors selected, namely vegetation coverage, slope, water environment, population density, and land use type, water environment factor exhibited the most significant influence on ecological sensitivity in the Yanbian area, followed by vegetation coverage and land use type, with population density and slope demonstrating relatively minimal impact. Subse? quently, the ecological sensitivity in the Yanbian area was divided into five levels: extremely sensitive, highly sen? sitive, moderately sensitive, slightly sensitive, and insensitive, accounting for 40. 13% , 44. 96% , 8. 98% , 4. 99% , and 0. 94% of the total study area, respectively. Based on the evaluation, differential land use manage? ment measures were then proposed for specific ecologically sensitive areas.
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2023 Vol. 42 (4): 761-767 [
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