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2023yearNo.42volumeNo.1phase

  • Analysis of global helium industry chain and China's strategy
    TANG Jinrong, ZHANG Yuxuan, ZHOU Junlin, LI Yuhong, NIU Yazhuo
    As an important strategic rare gas resource related to national security and the development of high-tech industries,helium is irreplaceable in liquid fuel rocket launch,deep diving and other fields,and has a profound impact on the high-quality development of "deep space,deep sea,deep earth,deep blue" and other fields.The integrated development of helium industry and innovation chains plays an important role to improve the security of resource supply.It has a great significance to promote the structural reform of helium supply and build a diversified helium supply system.This paper analyses the development situation of global helium resources industry and innovation chains integrated the resource side,the supply side,the consumption side,the trade side and the technology side.This study proposes the development status and challenges of China's helium industry and the corresponding development path of helium industry based on indicators such as resource conditions,capacity construction,foreign dependence,concentration of importing countries,concentration of importing enterprises,risk of importing countries,substitutability,the recycling rate,future supply and demand trend,industrial technology chain,management mechanisms.The results show that the global helium resource potential is considerable,but most countries remain in low exploration level;The global helium production capacity,supply,demand and trade pattern would be profoundly changing,but the contradiction between supply and demand would persist for a long time;The helium reservoir forming theory and exploration and development technology are underdeveloped,and the helium extraction equipment is continuously improved;The overall trend of global helium production develops well with a "helium heat" tide.The development subjects become diversified,which may change the global helium supply and demand pattern.China's helium development challenges and opportunities coexist considering the global helium resource industry chain pattern and the new trend of industry development.The 2022 is the key year to implement "the 14th Five Year Plan".It is desirable to conduct the work including the integrated chain analysis,the investigation and evaluation of helium resources,technical equipment research,the cultivation of market players,the construction of a diversified supply system.The above work will build an independent and controllable innovation chain,form a stable and resilient industrial chain,and provide helium resources guarantee for the development of high-tech industries.
    2023  .  42(1):    1-13    [摘要](154)    [PDF](264)
  • Detection of carbonate geothermal reservoir in Niudong fault zone of Xiong'an New Area and its geothermal exploration significance
    WANG Xinwei, GUO Shiyan, GAO Nan'an, LIU Huiying, WANG Tinghao, WEI Guangren, LEI Haifei
    In Xiong'an New Area,because of prohibiting the exploitation of sandstone geothermal reservoir,it is of a great significance to find out the distribution position and the resources quality of the karst geothermal reservoir of the Niudong fault zone,as an eastern boundary of the karst geothermal resources,for the compilation of geothermal resources development and utilization planning and the layout of overall energy utilization.Based on the detection data of the D09 borehole,as the first exploration well for karst geothermal reservoir in the high-speed railway area of the Xiong'an New Area,and combined with the interpretation results of seismic sections,the spatial distribution characteristics,physical properties of reservoir and single well productivity parameters of the karst geothermal reservoir in the Niudong fault zone are analyzed,and its guiding significance for geothermal exploration is also summarized.The results show that the karst geothermal reservoir in the Niudong fault zone is mainly siliceous dolomite in the Wumishan Formation of the Jixian System,which is distributed at the top of the broad,gentle anticline of the bedrock on the west side of the fault,and is high quality geothermal heating utilization resource with the stable layers thickness of about 2000 m,the roof buried depth of 1000~1200 m,the geothermal water temperature of about 70℃ and the single well production of about 102 m3/h.There are 122 fractured karst zones in the strata of 678 m from the top of the weathering crust in the D09 borehole,with the total thickness of 251.20 m,the fracture ratio of 37%,and an average porosity of 9.26%.The fracture rate and average porosity are obviously 50% higher than those of the geothermal wells out of the fault zone.A comparative analysis of geothermal gradient of the strata,geochemical characteristics of geothermal water and water-conductivity of reservoir between the D09 hole and the geothermal wells around the Niudong fault zone shows that the Niudong fault zone with a vertical fault distance of 7000 m is a deep fault of water-conducting and thermal-conducting in the basin.The fault zone defines the eastern boundary of the karst water-bearing systems in the Xiong'an New Area,constitutes a water channel for the Niutuozhen uplift and a oil-gas migration barrier for Baxian depression,and results in formatting a complete geothermal field of the Niutuozhen uplift with an area of 1000 km2.
    2023  .  42(1):    14-26    [摘要](145)    [PDF](257)
  • Shallow and submarine identifications of gas hydrate in the Makran accretionary prism,northern Arabian Sea
    ZHANG Zhen, DENG Xiguang, YAO Huiqiang, YU Miao, WANG Haifeng, XIAO Huizhong, CHENG Yuan
    The Makran accretionary prism located in the northern Arabian Sea is formed by the subduction of the Arabian plate beneath the Eurasian plate in a northerly direction at low speed and low angle,and there are abundant gas hydrate resources in the accretionary prism.Based on the high-resolution multi-channel seismic data,sub-bottom profile and multi-beam echo sounding data acquired by China in 2019,combined with the former investigation results,this paper discusses the shallow and submarine identifications of gas hydrate in the Makran accretionary prism.The seismic identifications mainly include bottom simulating reflector(BSR)and acoustic blank zone.The topographic and geomorphic signs include submarine pockmark,submarine slump,mound,mud volcano and cold seeps system.The water body signs mainly is flare.Gas hydrate samples have been drilled at the stations with water depth of 1000 m and 2900 m respectively.The abundant hydrate identifications of Makran accretionary prism may be related to the low velocity and low angle subduction geological background,which makes the hydrate identifications in this area show the characteristics of active continental and passive continental margins.Based on the distribution characteristics of identifications in the study area,the anticlinal ridges and theiradjacent areas in the central and western parts of accretionary prism are the gas hydrates prospective areas.
    2023  .  42(1):    27-40    [摘要](142)    [PDF](262)
  • Genesis of the newly discovered rubidium deposit in Hami,Xinjiang: evidence from deposit geology and geochemistry
    LIU Yanbing, WEN Meilan, WU Yanbin, ZHAO Chen, ZHENG Chaojie
    The newly discovered Zhangbaoshan rubidium deposit,located in Hami,Xinjiang,is a typical super-large,rare metal deposit in the East Tianshan area.Based on geological field surveys,mineralogy petrology,and geochemistry studies were conducted to study the granite mineralization and guide the prospecting of rare metals in this region to reveal the ore genesis.Research around the geochemical analysis of major and trace elements,rare earth elements (REE) shows that the petrochemical composition of rock mass was characterized by high silicon,alkali rich,Na2O>K2O,high F (>2%),high Rb,and ∑REE contents ranging from 21.4×10-6 to 190.4×10-6,with strong negative Eu anomaly.The distribution pattern of lanthanon has an "M" type REE tetrad effect.The trace elements are characterized by rich rare and scattered elements such as Li,Rb,Cs,W,Sn,Nb,Hf,Th,and Ga,which provide a material basis for rare metal mineralization.Element F,hosted in mica,has a high content in different phase bands of the magmatic evolution stage.F and rare metal elements form a series of complex compounds,which will migrate to the rock mass.Electron probe analysis indicates that element Rb presents isomorphism in the rock-forming minerals potassium feldspar and muscovite.The concentration of Rb in the veinis positively connected with the amount of potassium feldspar and muscovite.The rubidium-bearing rock body successively invaded the light granite,amazonite-bearing granite,amazonite granite,topaz-bearing amazonite granite,topaz albite granite,and amazonite-bearing granite pegmatite veins.The comprehensive analysis argues that the Zhangbaoshan rubidium deposit experienced multi-stage evolution and belongs to the magmatic crystallization and differentiation along with the metasomatismgenesis.The deposit type is a magmatic-hydrothermal deposit,whose formation era is in the late Indosinian period.
    2023  .  42(1):    41-54    [摘要](146)    [PDF](270)
  • Zircon U-Pb age of Xuanlong-type iron deposits in North China Craton and its constraints on genesis
    ZHANG Xusheng, YANG Xiuqing, ZHAO Jun, LIANG Ting, YANG Yun, LIANG Yongsheng, YANG Guowei, WANG Xiaoqing
    Xuanlong-type iron deposit is the most important sedimentary-type iron ores in North China,which was deposited during the Mid-Proterozoic era(1800~800 Ma).Here we report the results of zircon U-Pb dating for the Xuanlong-type iron deposit.In this study,we have found abundant detrital zircons in the iron ores in the Dalingbu area,Hebei Province,and we have reported the LA-ICP-MS U-Pb ages of these detrital zircons.In addition,we also dating the granite veins which intruded into the Chuanlinggou Formation in Pangjiabu area.Combing previous studies,two peak detrital zircons ages can be observed,i.e.,the ages of 1873 Ma and 2530 Ma,respectively.These ages effectively record ca.1850 Ma and 2500 Ma tectonic thermal events of North China Craton,which indicated that the iron ores may share a similar zircon sources with the surrounding rocks in Xuanlong area.However,their sources are slightly different from that of the Chuanlinggou Formation in the Ming Tombs District,Beijing.Therefore,we speculate that Xuanlong-type iron ores may be the product of North China Craton in response to the breakup of the Columbia supercontinent.The U-Pb age of zircons from the granite vein was 202.3±1.4 Ma(n=27,MSWD=0.96),which suggests that the occurrence of Indosinian magmatic activity in the studied area.Meanwhile,this indicates that the formation of magnetite ores may not be related to the Yanshanian magmatism,and its genesis needs further study.
    2023  .  42(1):    55-67    [摘要](144)    [PDF](259)
  • Simply discussion on the work of ground substrate survey: taking Hainan Island as an example
    LI Xiang, ZHOU Xiaohua, XIANG Zhenqun, JIANG Ren, TU Bing, ZHOU Dai, LU Min
    Ground substrate survey,a whole new field of natural resources survey and monitoring system in the current situation,has not evolved into an unified guide line on action.In this paper,based on the preliminarily summarization of the current situation of ground substrate survey,we provide the overall thinking about organization and implementation of national ground substrate survey in stages and from national level,reginal level and key areas level.Also,having taken into account of the geological background of breeding ground substrate in Hainan Island,we take a case study on how to carry out the ground substrate survey in the southern strong weathering area.Complying with the principles of combination of survey by different area and stage and supplemental survey,and investigation being of equal importance as survey,we divided the organization of ground substrate survey for Hainan Island into three levels,such as all over the Island level,watershed level,key area level.For the supplemental survey of ground substrate,we proposed basic survey indexes,characteristic indexes and evaluation indexes with emphasizing the control and influence of land-sea interaction and supergene geological effect under tropics strong weathering condition.After unravelling the current situation and evolution law of ground substrate,it is necessary to carry out the comprehensive evaluation and regionalization of ground substrate. Based above,we explored and summarized the technical methods of ground substrate survey in tropics strong weathering area.
    2023  .  42(1):    68-75    [摘要](145)    [PDF](256)
  • The discovery of Early Permian ammonite fossils in Galvan,West Kunlun,Xinjiang and its significance of lithofacies and palaeogeography
    HE Guojian, CHEN Jianzhong, ZHANG Miliang, YAO Jianbin, CHEN Haopeng, HU Weizheng
    It was the firt funded of the Prostacheoceras cf.Kongaraquense,Artinskia sp.,Agathiceras sp.ammonoid fossils in the Early Permian Strata in the Galvan Valley,Southwest Canyon area,Hotan,Xinjiang.The date of these three classes fossils is Cisuralian,which is equal to the date of Qixia Formation in the South China.The Prostacheoceras ammonoid is the main genus of Tethys type,while the Artinskia ammonoid is the special type of the Kungurian and the Agathiceras ammonoid is the global ammonite type in the Middle Carboniferous to Early Permian.Those three types ammonoid fossils which were funded in the Galvan area,enrich new fossil materials to the Jiawendaban Formation,and also provide important fossil evidences for the biostratigraphic correlation research of the West Kunlun.
    2023  .  42(1):    76-83    [摘要](135)    [PDF](267)
  • The development characteristics of surface fracture and secondary hazards at 5·22 Ms 7.4 earthquake in Maduo County Qinghai Province
    ZHOU Bao, LI Wufu, DONG Fuchen, WANG Bingzhang, ZHANG Xinyuan, LIU Jiandong, WANG Chuntao, CAO Jinshan, SONG Taizhong, ZHANG Kun, CHEN Lijuan
    At 2:04 on May 22,2021,an earthquake of magnitude 7.4 occurred in Maduo County,Guoluo Tibetan Autonomous Prefecture,Qinghai Province.In order to find out the characteristics of the surface rupture and associated secondary hazards caused by the earthquake,the survey team conducted surveys in the earthquake-affected area by means of remote sensing interpretation and field survey.The survey results showed that an active fault zone with a width of about 75 km and a length of about 230 km was formed between the Maduo-Gande fault and the Kunlun Mountain Pass-Jiangcuo fault; 653 ground fissures,1237 sand liquefaction and sand emitting,water spraying points,97 earthquake bulges and 2 collapse pits were found on the surface.The surface fractures were generally distributed in the north west -south east direction,with horsetail-like branches from west to east; the eastern section was oblique to the Maduo-Gande fault zone at a certain angle.The overall trend of the ground fractures was highly consistent with that of the Kunlun Mountain Pass-Jiangcuo fault.As indicated by the development characteristics of the earthquake surface fracture,the seismogenic fault of the Maduo Ms7.4 earthquake was Kunlun Mountain Pass-Jiangcuo fault,and the fault surface was generally inclined to the south,which featured left strike slip.As the earthquake broke out amid extrusion towards the Qinghai Tibet Plateau by the Indian Plate,the earthquake resulted from sinistral movement at strike-slip fault in the north under the tectonic action of strong eastward extrusion by Bayan Har block.The survey results provide the local government with first-hand basic information on the earthquake disaster loss assessment and post-disaster reconstruction in the disaster area.
    2023  .  42(1):    84-91    [摘要](124)    [PDF](275)
  • Age and geochemical characteristics of Late Cretaceous leucogranites pluton and dykes in Xieqiong area, Tibet: constraints on the post-collisional setting of Bangong Co-Nujiang belt
    LIANG Xiaoxiao, GAO Rui, LIU Han
    The Late Cretaceous intrusive rocks in the Zuogong Block,eastern Tibet are rarely reported.This article reports on the granitic pluton and dykes invaded in the Neoproterozoic Youxi Group in the Xieqiong area,through petrology,geochemistry and zircon U-Pb chronology,to reveal its petrogenesis and formation environment.The granitic pluton type is tourmaline-bearing muscovite monzonitic granite,and the dike rock type is fine-grained granitic dike.The LA-ICP-MS zircon U-Pb ages of the two are 88.5±0.7 Ma and 85.8±2.3 Ma,respectively,both invaded in the Late Cretaceous.They contains minor muscovite,no hornblende.The granitic pluton and dike are characterized by high SiO2(SiO2=74.17%~78.88%),rich alkali(K2O+Na2O=5.92%~9.00%)and rich Al(Al2O3=12.61%~15.13%),A/CNK =1.11~1.40,Ritman index δ<3.3,indicating that they belongs to the peraluminous calc-alkaline series;all are enriched in Rb,U,K,P and Pb elements and depleted in Nb,Ti and Ba elements;and strong negative Eu anomalies(δEu=0.18~0.56),which are indicative of peraluminous sub-alkaline S-type granite,and characteristics of a tourmaline-type leucogranite.It may be the product of dehydration and partial melting of water-bearing minerals(muscovite)in the upper crustal metamorphic mudstone caused by the transition from shortening and thickening extrusion environment to crustal extension environment.This result provides new constraints for the post-collision evolution process of the Bangong Co -Nujiang suture zone in the east.
    2023  .  42(1):    92-106    [摘要](140)    [PDF](277)
  • Longitudinal profile analysis of rivers draining edges of the Tibetan Plateau and its geomorphology implications
    XING Yukun, LIU Jing, WANG Wei, ZHANG Jinyu, LI Jinyang, ZENG Xianyang
    River systems are the main external driving force to transform the plateau landscape,and their morphological patterns record the growth of orogenic belt.The information of regional tectonics and climate can be obtained by extracting river geomorphology.At present,the study of river profiles around the margins of the Tibetan Plateau is mainly focused on the southern,southeastern and eastern edges.The similarities and differences in the development of rivers at different locations of the plateau edge have not been studied.In this study,we selected the major rivers in northern margin(West Kunlun-Altyn),northeastern margin(Qilian Mountain range),and southeastern margin(Sanjiang),and southern margin(Himalaya Mountain Range)to conduct a comparative study of river geomorphology,and to obtain quantitative regional tectonic and climatic information through longitudinal river profile analysis.The results show that the steepness of the rivers is associated with relief of the region:it increases significantly when they flow through the plateau edges,while the steepness is relatively low on both sides of the plateau edge.The rivers flowing through the northern edge have a steep increase in slope at the plateau edge,while the rivers in the northeastern,southeastern and southern edges are relatively gentle.Taken together,the knickpoints are mainly located at the plateau edge,indicating that the river incision is confined to the plateau edge and the migration of the knickpoints is limited.For a geomorphic unit as large as the Qinghai-Tibet Plateau,it is biased to analyze the timing of plateau uplift by river morphology under the steady-state assumption.The high-elevation,low-relief surfaces on the southeastern edge of the Tibetan Plateau may have formed under the action of gentler in stream flow systems and evolved to their present-day outflow state during subsequent river raids and other processes.
    2023  .  42(1):    107-121    [摘要](145)    [PDF](318)
  • Detrital zircon U-Pb age of Huangyangling Formation in Dujianshan area from West Kunlun,Xinjiang: implications for tectonic evolution of Tethyan Ocean
    TANG Mingying, ZHANG Yu, CUI Xiaofeng, HE Yuliang, DING Zhengjiang, DONG Zhenkun, DING Wenjie
    Huangyangling Formation is developed in the northern part of the Bayankara Basin in the Dujianshan area,western Kunlun,Xinjiang,which is composed of a series of fine clastic rocks such as gray feldspar lithic sandstone,gray-white quartz sandstone and gray-black siltstone, and there are a lot of tuff and carbonate lens in the middle part,which are rich in fossils,indicating the Middle Permian age.In order to further identify the sedimentary age and material source of the Huangyangling Formation in the region, two clastic rock samples were collected from the top and bottom of the first member of the Huangyangling Formation,and the zircon U-Pb age and micronutrient content were analyzed by LA-ICP-MS.The 206Pb / 238U ages of detrital zircon are mainly concentrated in the five ranges of 264~276 Ma,292~317 Ma,369 ~ 373 Ma,500~503 Ma,694~702 Ma.The youngest zircon has a peak age of 266.1 ±0.89 Ma, indicating that the Huangyangling Formation began to deposit in the Middle Permian.Based on the zircon micronutrient diagram,the diagenetic types of zircons and the age data obtained,the tectonic evolution of the Tethys Ocean in the region is compared,and it is considered that the detrital zircon of 264~276 Ma originates from granitic rocks and basic volcanic rocks in the Kunlun orogenic belt during the Hercynian movement,the detrital zircon of 292~317 Ma originates from the volcanic formations in the carboniferous-permian Tuokuzidaban Formation in the Kashitashi area,the 500~503 Ma detrital zircon is derived from magmatic tectonic evolution during the formation of the Paleo-Tethys Ocean body,while the 694~702 Ma detrital zircon is derived from the Tarim Block on the northern side of the Proto-Tethys Ocean or the northern Qiangtang microblock in the ocean,the detrital zircon of 369 ~ 373 Ma is inferred to be from a small-scale volcanic activity during the early cracking of the Paleo-Tethys Ocean in the Late Devonian.
    2023  .  42(1):    122-135    [摘要](129)    [PDF](278)
  • Age and geochemistry of volcanic rocks of Baishan Formation in Yagan tectonic zone,Northern Alxa and their constraints on regional tectonic evolution
    BAI Yuming, BO Haijun, HU Haoyuan, LEI Congcong, LI Chengyuan, YU Yang
    Paleozoic volcanic rocks are developed in Yagan area,northern Alxa,which is of great significance to study their formation age and geological characteristics for the evolution of the North Mountain arc basin system in the southern margin of the Middle Central Asian orogenic belt.In this paper,the isotope chronology and geochemical characterization of the proto-Ordovician volcanic rocks of the Yagan region are studied.The results show that the LA-ICP-MS zircon U-Pb age of the rhyolite is 298.4±1.5 Ma,which belongs to the early Early Permian.It is redetermined to the Upper Carbonifeous-Lower Permian Baishan Formation based on the characteristics of the lithological assemblage.This set of volcanic rocks belong to the calc-alkaline series,which have higher content of SiO2,higher content of K2O and lower content of TiO2.They are relatively enriched in large ion lithophile elements such as Rb,Pb,K,and are obviously depleted high field strength elements such as Ta,Nb,P and Ti.The sample apparent right-leaning distribution patterns of the REE with depletion in LREE and enrichment in HREE and negative Eu anomaly,and they have the geochemistry characteristics of continental arc.The new evidence shows that Baishan Formation in Yagan area formed in the subduction of Paleo-Asian Ocean towards the northern margin of Mingshui-Hanshan block,and it was resulted from magmatism of the active continental margin.
    2023  .  42(1):    136-145    [摘要](143)    [PDF](265)
  • Detrital zircon U-Pb age and geochemistry of sandstone from the Mohe Formation in the Mohe Basin Heilongjiang and their constraints on tectonic setting
    WANG Jiuyi, SUN Yanfeng, ZHOU Chuanfang, QIAO Mudong, XU Liming, WANG Yuanchao, HAN Feng, JIANG Ping, FENG Jia, ZHANG Qipeng
    Mohe Basin is located in the north of Greater Khingan Range and Erguna Massif at the eastern end of theXing’an-Mongolian orogenic belt.Through the study of detrital zircon chronology,petrogeochemistry,modern stratigraphy,paleontology and heavy minerals in the strata of the Mohe Formation,the sedimentary age,material source and geotectonic background are discussed,providing scientific basis for the study of the evolution of the Mohe Basin.Petrogeochemistry,heavy minerals assemblage and ATi (89.51~100.00,average 98.69) and GZi (39.76~100.00,average 64.50) index show that Mohe Formation is mainly under the background of active continental margin and continental island arc,and the provenance are feldspathic rocks of the upper crust,metamorphic rocks and sedimentary rocks,mixed with basic magmatic rocks in the lower crust or mantle.The CIA (50.35~60.37,average 53.22),and ICV index (0.91~1.79,average 1.40),Rb/Sr (0.08~0.67) and Th/U (5.05~5.81,average 5.55) ratios of the rocks indicate that the provenance of Mohe Formation have undergone relatively weak weathering.The ZTR index of heavy minerals reflects that the detrital has the characteristics of proximal transport.Fossils of paleoplants from the Early Jurassic -Early Cretaceousera were found in the Mohe Formation,combined with the detrital zircon LA-ICP-MS U-Pb chronology (the minimum age was 156±3 Ma),it was determined that the Mohe Formation was depositional in the Late Jurassic.The ages of detrital zircons are concentrated in three periods:1841~2462 Ma (n=4,Paleoproterozoic),indicating the existence of Paleoproterozoic crystalline basement in the Erguna Massif. 311~480 Ma (n=56) is a record of granitic magma formation under the extensional setting after the Erguna block and Siberian block were combined.156~242 Ma (n=48) is evidence of magma intrusion under the setting of Mongolia-Okhotsk Ocean subducted into the Erguna Massif.
    2023  .  42(1):    146-167    [摘要](131)    [PDF](289)
  • Near surface stratigraphic structure analysis in Nansha of Guangzhou thick overburden area: based on multi method results of 2D geophysics exploration
    CHEN Song, CHEN Changjing, LUO Shixin, LIU Shengbo, ZHAO Xinwen, ZENG Min, XI Yongzai
    The buried depth of Quaternary overburden,the distribution of concealed structures and the underlying rock characteristics directly affect the major infrastructure construction in Nansha,Guangzhou.Compared with the previous work methods mainly relying on drilling to find out the near surface stratum structure,this paper uses nondestructive geophysical methods to detect the near surface stratum distribution characteristics,which is more environmentally friendly,green and convenient.The applicability of geophysical methods for stratigraphic structure imaging is different,based on the existing work foundation in this area,in this paper,three methods of high density resistivity method,microtremor and audio magnetotelluric sounding(AMT) are optimized to identify the characteristics of stratigraphic distribution.Based on the acquisition parameter test,data processing principle and processing steps of each method,as well as the underground space test in the key development area of Nansha new area,the experience of three geophysical exploration methods suitable for detecting the underground space in this area is summarized.①High density resistivity method can accurately distinguish the interface between overburden and bedrock,and the inversion overburden depth is consistent with the data of many boreholes.Multiple profiles can be used to control the spatial distribution characteristics of the thickness of overburden in the whole survey area.②AMT has a large detection depth,in this paper,the effective detection depth is up to 500 meters and the lateral resolution is high.Inversion of resistivity section can determine the distribution of deep faults and concealed rock mass.③Microtremor detection has strong anti-interference ability,it can be used for nondestructive detection of special site background.The interpreted apparent S-wave velocity layered structure has good layered effect of profile response.Combined with the borehole data in the profile,using high density electrical method,microtremor and AMT detection,the stratigraphic structure characteristics of underground space can be accurately identified from multiple parameters of resistivity and shear wave velocity,so as to provide basic data for the development of urban underground space.
    2023  .  42(1):    168-179    [摘要](143)    [PDF](265)
  • Zircon U-Pb age and geochemistry of the bojite in Dong Ujimqi,Inner Mongolia and its constrains on the Late Paleozoic tectonic evolution
    ZHANG Xiawei, CHENG Yinhang, LI Yingjie, TENG Xuejian, WANG Shaoyi, LI Ying, LIU Haidong
    The research area is located in the east of the Xing’anling-Mongolian Orogenic Belt,Dong Ujimqi of Inner Mongolia.The complex tectonomagmatic activity in this area is the key to solve the tectonic evolution of Xing’anling-Mongolian Orogenic Belt.This study carried out zircon U-Pb dating analyses and petrographical,geochemical for the bojites firstly recognized in the Dong Ujimqi,so as to understand the characteristics of the mantle nature and structure.The bojite generally extends north-east and presents like rock plant.In these rocks,main rock forming minerals are plagioclase,hornblende and pyroxene.The dating results indicate that the bojite was formed in the Late Carboniferous(299±3 Ma).The geochemical data of the samples show that:SiO2(49.88%~51.98%),TiO2(1.2%~1.86%),MgO(4.42%~7.41%),Al2O3(15.55%~16.84%),MnO(0.12%~0.17%),CaO(5.67%~6.52%),Na2O+K2O(3.35%~4.63%),m/f(0.41~0.49),Mg#(52.56~60.82),TFeO(7.12~9.18).The standardized distribution pattern of REE chondrites is right-leaning with relatively enriched LREE.The rocks are enriched in LILE(Rb,Ba,K),and depleted in HFSE(Nb,Ta,Ti),LREE/HREE is stable,with negative Eu anomalies(δEu=0.87~0.98).The εHf(t)values of zircons from the bojite vary between 5.1~11.25,and their Hf one-stage model ages vary from 1039 Ma to 604 Ma.Combined with regional tectonic evolution,it may be due to the subduction of oceanic crust,the thermal dehydration of subducted plate resulted in the partial melting of overlying depleted mantle and the generation of calc alkaline magma.In the process of ascending and emplacement,it was contaminated by crustal materials in a weak degree,which formed in the subduction environment of Paleo Asian Ocean.There was a small amount of basic magmatism in Dong Ujimqi in the Late Carboniferous—Early Permian,which indicated that the tectonic setting changed from subduction orogeny to post orogenic extension.
    2023  .  42(1):    180-192    [摘要](125)    [PDF](255)

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