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  • Orogenic peridotite and its significance
    ZHANG Qi, ZHANG Wei, JIANG Lili, SHI Yuruo, JIAO Shoutao, WANG Cunzhi, WANG Zhen
    Orogenic peridotite and peridotite of ophiolite are mainly composed of mantlerock.Orogenic peridotite represents the mantle beneath the continental crust,and peridotite of ophiolite represents the mantle beneath the oceanic crust.The mantle beneath the oceanic crust is generally close to the mantle beneath the continental crust in terms of material composition,but the tectonic setting is different.This paper briefly introduces the composition of orogenic peridotites,high-pressure and ultrahigh-pressure metamorphism related to orogenic peridotites,mantle fluids,mineralization,and mechanisms of orogenic peridotite emplacement,and also briefly introduces several possible orogenic peridotites in China such as the Songshugou peridotite in the Qinling Mountain,the Raobazhai rock mass in Anhui,several rock masses in the Yidun-type area in western Sichuan,Santai rock mass in western Yunnan,and Dadaoerji rock mass in Gansu.The evolution process of orogenic peridotite and its difference from ophiolite peridotite are discussed.It is pointed out that the difference between ophiolite and orogenic peridotite is not mainly in material composition and geochemistry,but in tectonic setting.Is there no abyssal sediment? Is it mixed up? Yes,it is peridotite of ophiolite;no,it is orogenic peridotite.Is there any UHP metamorphic effect? Is there mantle metasomatism or strong mantle metasomatism? Some are very strong and may be orogenic peridotites;no,they may be peridotites of ophiolite.Cold emplacement is peridotite of ophiolite,and thermal emplacement is orogenic peridotite.It is pointed out in this paper that the formation of orogenic peridotite has generally experienced two stages of tectonic evolution:the initial thinning of the continental crust,the rifting stage,and the late extruding orogenic belt.In some areas,only the rift stage is developed,and the tectonic evolution finished after the rift,also known as orogenic peridotites,such as Zabargad in the Red Sea,Ronda in Spain,Beni Bousera in Morocco,and Yidun peridotite in China.The peridotite of ophiolite appears in the orogenic belt,representing the ocean basin that has disappeared;the orogenic peridotite generally appears in the orogenic belt,but it represents the thinned and torn continental crust.It is necessary to study and demonstrate whether the peridotite that appears in the orogenic belt is ophiolite because their tectonic meanings are different.
    2020  .  39(10):    1489-1506    [摘要](99)    [PDF](108)
  • The discovery and limplications for the India-Eurasia Plate collision of the Nianbo Formation adakitic rocks from Yangyi basin in Middle Gangdise Belt
    HU Lin, TANG Hua, XU Gang, LIU Daming, XIAO Jin
    The Eocene Nianbo Formation Adakitic volcanic rocks were discovered for the first time from the Yangyi basin in the Middle Gangdise Belt.This set of adakitic volcanic rocks consists of dacite,rhyolite,and volcanic lava.In order to determine their formation age,origin and geological tectonic significance,the authors conducted LA-ICP-MS zircon U-Pb geochronologic,petrographic and geochemical studies.The results show that the zircons used for dating are of magmatic origin,and the zircon 206Pb/238U dating yielded 55±0.8 Ma,which suggests that the volcano erupted in Eocene.Geochemical characteristics show that the volcanic rocks belong to a series of weakly peraluminous calc-alkaline rocks,and have rich Si(SiO2 of 67.69%~71.93%),high Al(Al2O3 of 13.13% ~ 16.16%),low Mg(MgO of 0.52%~ 0.76%),higher Sr(Sr of 345×10-6~875×10-6),and lower Y(Y of 4.40×10-6 ~11.30×10-6)and Yb(Yb of 0.81×10-6 ~1.49×10-6).The total rare earth element values vary in the range of 116.86×10-6~352×10-6,exhibiting obvious fractionation between light and heavy REE((La/Yb)N=23.31~43.66),with no obvious δEu anomaly(0.8~1.15).Enrichment of LILE(Rb,U and Th)and depletion of HFSE(Nb,P and Ti)are displayed in the primitive mantle normalized multi-element variation diagram,indicating geochemical characteristics of C-type adakitic volcanic rocks.Based on regional information,the authors hold that adakitic rocks of Nianbo Formation in Yangyi basin were formed by partial melting of thickened lower crust,indicating that some areas of the southern margin of Lhasa were thickened to about 50 km around 55±0.8 Ma.
    2020  .  39(10):    1507-1517    [摘要](83)    [PDF](63)
  • The zircon U-Pb age and geochemical characteristics of ore-bearing granite in the Niuduo graphite deposit eastern Tibet
    ZHOU Xin, FAN Bingliang, YU Jiashu, YI Jinlong, FENG Dexin
    There may be a crystalline graphite ore belt from Chaya to Zuogong in eastern Tibet,which has great potential for prospecting.Three graphite orebodies were discovered from north to south,i.e.,Niuduo,Diguo and Qingguo.The latest geological survey shows that the Niuduo graphite deposit is expected to reach the scale of large-scale deposits,but the theoretical research work remains very insufficient.In this paper,based on the basic geological characteristics of the mining area,the authors studied the petrology,petrogeochemistry and zircon U-Pb chronology of the ore-bearing rock mass.The results show that the ore-bearing granite has the characteristics of K-rich,peraluminium,calc-alkaline S-type granite,and the REE distribution curve is right-inclined LREE enrichment type,with obvious LREE fractionation and obvious negative Eu anomaly.Trace element characteristics show that high field strength elements such as Nb,Ba,Sr,P and Ti are deficient,especially Ti,while large ion lithophile elements such as Rb,K and U are relatively enriched.Zircons in the samples have obvious oscillatory zones with high Th/U ratios(generally higher than 0.4),suggesting typical magmatic zircons.The 206Pb/238U age of zircons determined by LA-ICP-MS is 258.1+1.9 Ma,MSWD=3.5(n=35),and the age of zircons is Late Permian.Geochemistry shows that the Niuduo granite originated from partial melting of continental crustal complex sandstone,and the diagenetic temperature was relatively high.It may have been formed by collisional orogeny resulting in crustal thickening,warming and remelting.
    2020  .  39(10):    1518-1526    [摘要](59)    [PDF](54)
  • The discovery of dinosaurs from the Middle Jurassic Xintiangou Formation in Xinjin Township Yunyang Chongqing and its sedimentary environment
    ZHOU Yuxuan, HU Haiqian, DAI Hui, TAN Chao, YANG Wenguang, ZHANG Hongliang
    Recently,a large number of dinosaur fossils were found in the Middle Jurassic Xintiangou Formation in Xinjin Township,Yunyang County,Chongqing,and the dinosaur fossils were intermixed with fishes,turtles,plesiosaurs and bivalves.This is the first discovery in the Xintiangou Formation.The Xintiangou Formation in the study area is preliminarily determined to be a littoral-shallow lake subfacies and partly a flood-pan subfacies,as shown by field measured section,rock features,sedimentary structure,paleontological features and grain size characteristics.The discovery of the fossil assemblage of Xintiangou Formation in Chongqing area provides more evidence for the study of Mesozoic fossil and paleoenvironment in the Sichuan basin.
    2020  .  39(10):    1527-1537    [摘要](128)    [PDF](235)
  • Geochemical characteristics and formation environment of metamorphic rocks in Etouchang Formation of Middle Proterozoic Lower Kunyang Group in northeastern Yunnan
    MIAO Yu, WEI Shaogang, Lü Xiaochun, SONG Wenting, WAN Liwen
    As an important part of the metamorphic fold basement on the western margin of the Yangtze block,the light metamorphic rock series of Kunyang Group has attracted much attention from experts for its formation and evolution mechanism.Taking the metamorphic rocks of Etouchang Formation,the representative stratum of Kunyang Group,as an example,this paper constrains the protolith type,provenance,sedimentation and tectonic environment background of the metamorphic rocks in the aspects of rock symbiotic association,petrographic markers and petrogeochemical.The micropaleontology and isotopic age of the metamorphic rocks indicate that the diagenetic age of the metamorphic rocks belongs to Late Mesoproterozoic,and the sedimentary facies and petrographic shows the characteristics of normal marine sedimentary.Comprehensive petrogeochemical analysis shows that the original rocks of metamorphic rocks were composed of graywacke and subgraywacke with some mudstone components,which were formed in the oxidative sedimentary environment of the shallow-littoral facies.The rocks experienced moderate weathering and leaching with lower rock maturity and leaching with lower rock maturity.The sediments mainly came from the tectonic active area of the upper crust,with the characteristics of single cycle sedimentary products in the active structural belt and experienced a certain degree of intracrustal geochemical differentiation.The main source of the sediments was the continental island arc type low aluminum TTG series volcanic rocks,with the intervention of part of the upper crust terrigenous materials.Furthermore,petrogeochemical characteristics also show that the metamorphic protolith mainly deposited in the passive continental margin tectonic environment.The authors hold that the metamorphic protoliths were probably formed in the residual basin in the late closure stage of Kunyang marine rift basin.
    2020  .  39(10):    1538-1548    [摘要](52)    [PDF](43)
  • An analysis of sedimentary environment and prototype basin of Lueyang Group in the Mian-Lue-Ning triangle area Shaanxi Province
    YANG Yunjun, HAN Xu, BIAN Xiaowei, ZHANG Manshe, ZHANG Mingyun
    Lueyang Group sedimentary rock of the Late Paleozoic is located in the Mian-Lue-Ning triangle area, Shaanxi Province. It is mainly distributed in the east of Motianling block and Mian-Lue suture of South Qinling Mountain. According to field survey, there are differences in sedimentary environment and Prototype basin. Lueyang Group. is characterized by wide distribution, complex rock assemblage and diverse sedimentary environment. The rhythm-cyclic sedimentary sequence composed of coarse to fine clastic rocks developed in Tapo Formation can be divided into three sections. The lower section includes the coarse clastic rocks from alluvial fan of different source areas, and the ancient water direction is from south to north; the middle-upper section is characterized by the sedimentary deposits of the middle-high grained clastic rocks, which represent the delta environment. Lueyang Formation consists of carbonate platform facies and slope facies. The sedimentary action and material records represented by the Tapo Group marked the deposition events of late Paleozoic rifting and confined stabilization basin background on the east margin of the Motianling block and Mian-Lue suture. The research has great significance in the study of tectonic evolution in Mian-Lue-Ning triangle area.
    2020  .  39(10):    1549-1560    [摘要](49)    [PDF](56)
  • The gravel characteristics of Pliocene conglomerates in Zhangxian area on the northern margin of the West Qinling and its geological significance
    XU Hehongxin, GUO Jinjing, LIU Chongqing, ZHAO Haitao, DU Zhirui
    There are two sets of Cenozoic sedimentary stratigraphic units separated by angular unconformity in Zhangxian area on the northern margin of the West Qinling,namely,the Lower Oligocene-Miocene salt-bearing sedimentary sequence and Pliocene coarse conglomerates.Based on the observation and statistical analysis for sedimentary cycle,gravel size,roundness,arrangement,composition and its vertical changes of Pliocene coarse conglomerates in this area,the authors have summarized the main characteristics of this set of conglomerates and its gravels as follows:①This set of conglomerates is mainly composed of thick,coarse conglomerates with a thickness of 480m,which covers unconformably the underlying Oligocene-Miocene salt-bearing sedimentary sequence and,from the bottom to the top,it can be divided into five lithologic beds,i.e.,alluvial,fluvial,alluvial-fluvial,fluvial,alluvial-fluvial conglomerate beds;②the gravels of the conglomerates are characterized by poor sorting with wide grain size distribution range in which the maximum size is 120-240 mm with the major size being 10-80 mm,gritty cementation,matrix supported texture with a little grain supported texture,being mainly sub-angular and sub-roundness with a little roundness;③the gravels of the conglomerates mainly are grayish green feldspar sandstones,feldspar quartz sandstone,gray or grayish red limestone and porphyry granite,granodiorite or diorite porphyrite.In addition,the gravel compositions in different lithologic beds are obviously different.Generally,gravels in the alluvial conglomerate section mainly are various granitic rocks and sandstones,while those in fluvial conglomerate section are dominated by limestone gravel with some roundness;④the gravel southward imbrication orientation indicates the paleocurrent direction from south to north.Based upon the above mentioned conglomerates’ and gravels’ characteristics,the spatial distribution controlled by south dip F2 thrust faulting,and consistency of the gravel compositions with the rock composition of the West Qinling orogenic belt,it is suggested that the Pliocene conglomerates should be the rapid accumulation,near-source,alluvial fan deposits in front of the mountain with the boundary of the fault on the north margin of the West Qinling with the nature of regenerated foreland coarse molasse basin.Furthermore,a series of conglomerates are similar to the Pliocene Hanjiagou conglomerates in lithic characteristics,age and tectonic setting,such as Ganjia conglomerates in Xunhua basin and Jishishan conglomerates in Linxia Basin on the northeastern margin of the Tibetan Plateau,and hence it is proposed that the development of Pliocene conglomerates in Zhangxian area on the northern margin of the West Qinling was related to the northward growth and expanding of the Tibetan Plateau to the northern margin of the West Qinling Mountain under the India-Europe collision dynamic background.This northward growth and expanding not only triggered the rapid uplift of the Qinling orogenic belt but also led to the reactivation of the northern margin fault and strong northward thrusting,which resulted in the formation of the regeneration foreland molasse basin.
    2020  .  39(10):    1561-1572    [摘要](46)    [PDF](58)
  • Pollen and spore assemblages ages and climate of Tuchengzi Formation in Qianjiadian Basin Beijing
    HE Jinrui, NAN Yun, HAO Chunyan, SONG Qingwei, JIAO Runcheng, LI Liangjing, RAN Shuhong, CHENG Suzhen, WU Jiayue
    In this paper,pollen and spore assemblages of the first and second members of Tuchengzi Formation in Qianjiadian Basin,Yanqing,Beijing,were studied an discussed.There are 12 genera,8 species and 6 undetermined species of pollen and spore in the strata.The dominant pollen and spore assemblage isClassopollis spp.(over 90%),and secondary pollen is riblessbicapsular pollen of some conifers.Fern spores are very few,whose genus and species differentiation and content are much lower than those of gymnosperm pollen,accounting for only 2.13% of pollen and spore assemblage.The current pollen and spore assemblage is peak-time Classopollis assemblage.It is inferred that its age is early stage of late Jurassic.Based on the analysis of other fossils in the area,it is considered that,under the wholly arid or semi-arid climate conditions of Tuchengzi Period,there at least existed local lake climate.
    2020  .  39(10):    1573-1579    [摘要](36)    [PDF](39)
  • A discussion on a simple method for sequence delimitation of loose strata in complex sedimentary environment
    ZHANG Yun, Lü Dunyu, LIU Changli, LIU Songbo, ZHANG Jianyu, WANG Cuiling, MENG Shuran, XIE Zhifeng
    Quaternary loose strata play an important role in engineering construction and urban development.The complex sedimentary environment in some areas makes it difficult to divide and understand the stratigraphic sequence changes.With the help of limited dating data,the methodspreviously used can only reflect the situation near the sample points and is expensive.Taking the north of Zhengzhou Airport Area as an example,this paper discusses and improves a stratigraphic sequence delineation method,which is composed of a series of key division steps to focus on reflecting the formation genesis,lithological characteristics and sedimentary rotation changes of the strata,also including geological tectonic movement climate rotation changes and stratigraphic age information.The method was applied to the division of loose stratigraphic sequence in this area.This method can solve the existent problems very well.In addition,the delimitation results are in line with the evolution characteristics of geological environment in the working area.Some strata with obvious characteristics can be found in the adjacent areas and,in combination with other information indicators,the method can meet the accuracy requirements of stratigraphic sequence division in geological scale.
    2020  .  39(10):    1580-1588    [摘要](41)    [PDF](52)
  • The physical and chemical characteristics of crude oil and oil-source of Juyanhai depression in Yingen-Ejina Basin
    LU Jincai, WEI Jianshe, JIANG Ting, XU Haihong, WANG Baowen
    An analysis of physical and chemical characteristics of crude oil of Jigeda,Tiancao and Lujing sag in Juyanhai depression shows that the crude oil is mainly light- volatile oil,condensate is produced in individual wells,and the physical characteristics of the crude oil are low viscosity and medium freezing point.The chemical characteristics of crude oil are highly saturated hydrocarbon(78.06%~92.95%),light isotope of the whole oil(δ13CPDB from-33.7‰ to -32.0‰)and the ratio significantly greater than 1 of light hydrocarbon to heavy hydrocarbon(∑nC21-/∑nC22+ from 1.28 to 2.94).The physical and chemical characteristics show that the parent material is mainly low aquatic organism,and the thermal evolution degree is mature-high mature.Based on an analysis of the source rocks of the surface profile of the adjacent area and the source rocks revealed by wells,the authors made a comparative study of the biomarkers of oil and source rocks as well as carbon isotope,represented by two oil production zones of late Carboniferous intrusive rocks and middle-lower Permian of Mengecan 3 well in Jigeda sag.The results indicate that the crude oil has good relationship with Carboniferous-Permian hydrocarbon source rocks,but it is not related to Cretaceous source rocks,and hence the parent rocks of crude oil are surely Carboniferous-Permian source rocks.Then according to the fact that the evolution degree of the parent rocks indicated by crude oil is significantly higher than that of the source rocks revealed by wells,it is believed that there is the contribution of the source rocks in the deep layer(lower Ganquan Formation).The comprehensive analysis shows that the revealed oil and gas reservoir is a Carboniferous-Permian petroliferous system in Juyanhai depression,which should be taken as the main exploration target.
    2020  .  39(10):    1589-1599    [摘要](40)    [PDF](45)
  • Maihanhada Formation Reservoir sensitivity of Permian inBabei sag Yin'E Basin
    XU Kaitong, WANG Nashen, SHEN Biao, Lü Rui, MA Kai, WANG Guan, HUANG Yujia, JIA Chunzi, ZHANG Chaoyang, LI Guifang, WANG Xuemei
    Reservoir sensitivity is the degree of sensitivity to various factors that cause damage to the reservoir. The main purpose of reservoir susceptibility analysis is to study the damage degree of various sensitive factors to reservoirs and to propose preventive measures to improve the final recovery rate of crude oil. In order to study the damage to the reservoirs in the Permian reservoirs in the Babei depression of the Yingen-Ejinaqi basin, the authors carried out a large number of laboratory experiments on the core of the reservoir. The reservoir sensitivity test was used to evaluate the reservoir sensitivity. The standard was evaluated for the sensitivity of the area. The results show that the reservoirs of the Permian buried Khan Formation are intermediately strong, sensitive, weakly alkaline, moderate to strong, and slightly weak and medium weak. In the future exploration and development, the protection of oil and gas as well as the increase in the choice of measures can be used to respond to the corresponding measures.
    2020  .  39(10):    1600-1607    [摘要](35)    [PDF](46)
  • Research progresses on marine sandstone copper deposit and some existent problems A comparative study of the Katanga copper mine in Central Africa and the Dongchuan copper mine in Yunnan
    ZENG Ruiyin, ZHU Xinyou, ZHANG Xiong, ZHAN Yong, XIAO Jian, TAN Kangyu, HUANG Jianye, ZHANG Hua, ZENG Baocheng, YANG Fengjun
    Marine sandstone-hosted copper deposits constitute one of the most important copper deposits in the world,and most of them occur in giant Neoproterozoic and Permian sedimentary basins.The orebodies are usually stratified and stratoid in clastic or marine carbonate rock formations with multi-layered metallogenic characteristics.Based on the research status of marine sandstone-hosted copper deposits,the authors reviewed the research results of the Katanga copper belt and the Dongchuan copper belt discovered in recent years in the aspects of metallogenic material source,metallogenic fluid property,source,transportation and metal element precipitation mechanism,and found that the basin-brine-metallogenic model of epigenetic mineralization has gradually replaced the original sedimentary-transform model.Two copper deposit belts belong to the Proterozoic sand shales-dolomitic carbonate-black carbonaceous shales.The orebody has obvious stratigraphic characteristics,and is controlled by fold,fault and breccia.A comparison of the two copper belts in the aspects of ore-bearing structure and mineralization characteristics reveals that the Dongchuan copper deposit has a high degree of similarity to the Katanga copper deposit in that they both have the characteristics of basin-brine-metallogenic model.Then,the existing problems in the study of genetic type,metallogenic mechanism and fluid source from marine sandstone copper deposit and the Dongchuan copper deposit are discussed.
    2020  .  39(10):    1608-1624    [摘要](38)    [PDF](50)
  • Characteristics and genesis of the Ahangaran Pb Cu deposit Iran
    HAN Chaohui, SONG Yucai, LIU Yingchao, HOU Zengqian, CHENG Yang, ZHAI Zhongbao
    The Ahangaran Pb(Cu) deposit is located in the Sanandaj-Sirjan metamorphic zone of the Zagros orogenic belt, a Cenozoic continental collisional zone between Arabian(south) and Iran(north) blocks. The deposit is hosted in Lower Cretaceous dolomitic limestone and has conformable and lenticular orebodies and bed-crosscutting ore veins. Pre-ore stage of minerals are fine-grained quartz, and ore stage of minerals are composed of dolomite, barite, calcite, coarse-grained quartz, galena, chalcopyrite, pyrite, and tetrahedrite. The study of the fluid inclusions shows that the ore fluids are a Cl--Na+-Ca2+-Mg2+ system, with homogenization temperatures from 108℃ to 210℃ and the salinities from 7%NaCl eq to 29%NaCl eq. Combined with data of C-H-O isotopes from ore stage hydrothermal gangue minerals and associated fluid inclusions, the authors hold that the ore fluids were mainly derived from basinal brine, with or without contribution from magmatic fluids. The mineralization process led to the dissolution of the host carbonate. The δ34S values of barite range from 18.7‰ to 22.7‰, and sulfides range from -3.1‰ to 9.7‰, suggesting that the reduced sulfur was probably the result of biological sulfate reduction(BSR). But this does not exclude the probable contribution of reduced sulfur from thermochemical sulfate reduction(TSR). The 206Pb/204Pb,207Pb/204Pb, and 208Pb/204Pb ratios of galena are 18.4083~18.454, 15.6512~15.6548, and 38.5628~38.5515, respectively, which are similar to those of the other Pb-Zn deposits in this region, i.e., the Malayer-Esfahan carbonated-hosted Pb-Zn metallogenic belt. It is suggested that their metals were derived from the same upper crustal rocks. Although the Ahangaran deposit shares some similarities with Mississippi Valley-type(MVT) deposits, the enrichment of ore stage quartz and copper sulfides suggests that the deposit may be classified as a magmatic-related carbonate-replacement-type deposit.
    2020  .  39(10):    1625-1638    [摘要](48)    [PDF](45)
  • Mineral chemistry characteristic and enlightenment to diamond prospecting of spinelite in kimberlite from Shizhuang area Henan Province
    LI Jishan, TANG Xiangwei, GUO Yueshan, ZHANG Yang, LIU Wei
    Kimberlite in Shizhuang area of southern Henan Province lies in the south of North China plate and in the north of Luanchuan-Minggang deep-large fault zone.Indicative minerals of diamond,such as spinel,are found in Kimberley rocks.The indicative minerals of spinel and other diamonds have been obtained from kimberlite in Shizhuang area by artificial heavy sand identification.The chemical composition of spinel was studied by means of electron microprobe analysis in this paper.The results show that the spinel group minerals in kimberlite in Shizhuang area are mainly composed of magnesia chromite(MgCr2O4)-chromite(FeCr2O4)-magnesia spinel(MgAl2O4)-spinel(FeAl2O4),in which magnesia chromite(Fe,Mg)Cr2O4 is dominant.The content of Cr2O3 and Al2O3 in chromite varies widely,MgO content is high(5.57%~15.8%),TiO2 content is low,and there exists a chromite with low titanium,rich magnesium and high aluminum content(S5 type).Among the cations of chromite,Mg2+ > Fe2+,while Cr3+ and Al3+,Mg2+ and Fe2+ have experienced extensive substitution.A preliminary analysis shows that chromite in kimberlite in Shizhuang area is mantle xenocryst,while in situ mantle is peridotite.The chemical characteristics of spinel minerals show that the kimberlite in Shizhuang area has the capability of carrying diamond,which is of great significance for the exploration of kimberlite type diamond deposits.
    2020  .  39(10):    1639-1649    [摘要](57)    [PDF](51)
  • The evaluation of ecosystem service value and its spatial change in the Yellow River Basin and suggestions from the ecological geology perspectives
    WANG Yao, CHEN Ruishan, XIA Zilong, GUO Chihui
    Yellow River basin has significant ecological value for China, and hence the ecosystem service within the basin is very important. In this paper, the authors chose the municipalities through which the Yellow River is flowing as the study areas, assessed the value of ecosystem services in the basin, and detected the hotspot of the ecosystem services and resilience of the ecosystem. This is a fundamental issue for ecological environment protection and high-quality development of the Yellow River basin. Based on ARCGIS software and Google Earth Engine platform, the authors quantitatively evaluated the changing value of ecosystem services in Yellow river basin and its spatial dynamics, then put forward several suggestions for eco-geological arrangement. The results show that the dominant ecosystem services in the Yellow River basin are hydrological regulation, climate regulation, and soil conservation. For the whole basin, the ecosystem services value in the Yellow River basin increased 33.4% from 2000 to 2015, within which that of the upper stream areas like Yushu-Aba mountain areas decreased significantly, that of the loess plateau increased significantly, and that of the lower river basin decreased slightly. The ecological environment and economic development have low coordination state. There is a spatial mismatch between the ecosystem services supply and demand in the lower river basin. To restore and maintain the ecosystem services and function in the Yellow River basin, the authors put forward several suggestions from the ecological geology perspectives: carrying out ecological geological survey, monitoring and evaluation based on earth system science theory; creating a systematic ecological geology survey institution for the whole basin; developing a system of survey, monitoring and management to achieve the "smart river basin"; evaluating the carrying capacity of the river basin through the time; focusing on critical process, focal regions, key factors and then deploying the ecological geologic survey. The authors' aim is to improve the ecosystem services value, and optimize the land use configuration of the whole river basin.
    2020  .  39(10):    1650-1662    [摘要](52)    [PDF](53)
  • Geological data information management and service system construction based on “internet + government service”
    WU Xiaoping, WANG Qianju, JIANG Tianyang, LI Yulong, WU Jianjia, PENG Yingping
    This paper focuses on the need for geological data management and public services, with the goal of improving the efficiency and service capacity of geological data management. The authors analyzed the status and problems of geological data information management services, put forward the overall construction idea of "user-oriented, resource integration, business collaboration, shared services", and constructed the application model of "Internet + government services". The construction of geological data information management service system is driven by business requirements to integrate applications. The core of the overall system architecture is geological data information management and public services,achieves "one-stop collaboration, one-net communication, one-yard pass management" for national geological data management and service information, promotes national geological data management and service information sharing,and forms "national unified, dynamic update, multi-level linkage, authoritative release" geological data management and service system, so as to provide better services for geological data senders and the public.
    2020  .  39(10):    1663-1668    [摘要](33)    [PDF](49)

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