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Attenuation of arsenic in a karst subterranean stream and correlation with geochemical factors: A case study at Lihu,South China

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Journal of Environmental Sciences 2014年第11期26卷 2222-2230页

作者： Liankai Zhang Hui Yang Jiansheng Tang Xiaoqun Qin Au Yik Yu institute of Karst Geology Chinese Academy of Geological Sciences Karst Dynamics Laboratory Ministry of Land and Resources and Guangxi Zhuang Autonomous Region

Arsenic （As） pollutants generated by human activities in karst areas flow into subterranean streams and contaminate groundwater easily because of the unique hydrogeological characteristics of karst areas. To elucidate the reaction mechanisms of arsenic in karst subterranean streams, physical-chemical analysis was conducted by an inductively coupled plasma mass spectrometer and an X-ray fluorescence spectrometer. The results show that inorganic species account for most of the total arsenic, whereas organic arsenic is not detected or occurs in infinitesimal amounts. As（III） accounts for 51.0% ± 9.9% of the total inorganic arsenic. Arsenic attenuation occurs and the attenuation rates of total As, As（III） and As（V） in the Lihu subterranean stream are 51%, 36% and 59%, respectively. To fully explain the main geochemical factors influencing arsenic attenuation, SPSS 13.0 and CANOCO 4.5 bundled with CanoDraw for Windows were used for simple statistical analysis and redundancy analysis （RDA）. Eight main factors, i.e., sediment iron （SFe）, sediment aluminum （SAI）, sediment calcium （SCa）, sediment organic matter （SOM）, sediment manganese （SMn）, water calcium （WCa^2＋）, water magnesium （WMg^2＋）, and water bicarbonate ion （WILCOX） were extracted from thirteen indicators. Their impacts on arsenic content rank as： SFe〉SCa〉WCa^2＋〉SAl〉wHCO3^-〉SMn〉SOM〉WMg^2＋. Of these factors, SFe, SAl, SCa, SOM, SMn, WMg^2＋ and WCa＆2＋ promote arsenic attenuation, whereas WHCO3^- inhibits it. Further investigation revealed that the redox potential （Eh） and pH are adverse to arsenic removal. The dramatic distinction between karst and non-karst terrain is that calcium and bicarbonate are the primary factors influencing arsenic migration in karst areas due to the high calcium concentration and alkalinity of karst water.

关键词： Karst subterranean stream Sediment Arsenic Geochemical factors Redundancy analysis

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Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China： Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes

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Journal of Earth Science 2018年第4期29卷 939-959页

作者： Xinyu Wang Zhen Yang Nengsong Chen Rui Liu School of Earth Sciences China University of Geosciences Wuhan 430074 China geological prospecting institute of guangxi zhuang autonomous region Nanning 530023 China Faculty of Earth Resources China University of Geosciences Wuhan 430074 China

There are a wide range of magmatism and mineralization in the Yunkai area of South China during the Late Yanshanian Period, including the newly discovered Michang, Youmapo, Sanchaehong and Songwang porphyry-skarn W-Mo deposits. In this study, we obtained zircon U-Pb ages of the ore-bearing biotite granites and their mafic enclaves from 884-1 to 1104-1 Ma. Zircons from the granites show Hf isotopic compositions with negative C-Hf（t） values of -5.9 to -0.6 and calculated Hf model ages （TvM2） of 1.5-1.2 Ga; indicating that the Middle Proterozoic crustal materials may have provided an important source for the magmatic rocks in this district during the Late Yanshanian Period, whereas zircons from the mafic enclaves show positive era（t） values of 1.3 to 10.1 with younger Hf model ages （TDM2） of 0.5-1.1 Ga, suggesting a mantle component may have involved in the granitic magma generation. Sulfur isotope study of the sulfide minerals from the W-Mo deposits show a narrow 834S distribution with most data ranging from -4.2%0 to 5.2‰. In addition, this study reports the first Fe isotopic compositions of pyrite in the W-Mo deposits, which show a uniform distribution range with the values near zero （656Fe=0.16‰-0.58‰, average 0.35‰; 657Fe=0.02‰-0.54‰, average 0.48‰）. These data indicate that the ore-forming materials may come from the deep-sourced granitic magma, and the mineralizations show a close relationship with the granitic magmatism during the Late Yanshanian Period. Combining with previous results, we suggest that there is a widespread porphyry-skarn W-Mo mineralization in the Yunkai area during the Late Cretaceous （80-110 Ma）, which has a close relationship with the Late Yanshanian magmatism that may have formed during the rollback of the subducted Pacific Plate.

关键词： zircon U-Pb age Hf isotopes S-Fe isotopes granitic magmatism Late Yanshanian Yunkai area.

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Deep electrical structures of Qinzhou-Fangcheng Junction Zone in guangxi and seismogenic environment of the 1936 Lingshan M6^(3/4)earthquake

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Science China Earth Sciences 2024年第2期67卷 584-603页

作者： Bin ZHOU Chunheng YAN Yan ZHAN Xiangyu SUN Sha LI Xiang WEN Yajun MO Yongdong YUAN Yuan YUAN Meili HUANG Earthquake Agency of guangxi zhuang autonomous region Nanning530022China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing100029China guangxi Geophysical Survey institute Liuzhou545005China

The tectonic position of the southwest section of the Qinzhou Bay-Hangzhou Bay Tectonic Junction Zone(QHTJZ)can be determined by examining the Qinzhou-Fangcheng Junction Zone(QFJZ)in *** zone is significant because it was the location of the largest earthquake ever recorded in the inland region of South China,specifically the 1936 Lingshan M6^(3/4)earthquake in ***,this region serves as an optimal location for researching the origins of intraplate earthquakes in South *** study presents a display of a broadband magnetotelluric(MT)prospecting profile that traverses the guangxi QFJZ and the Lingshan earthquake zone,extending from the northwest(NW)to the southeast(SE).A resistivity structure model was generated using three-dimensional(3D)inversion technology along the *** main faults in QFJZ were analyzed in terms of their deep extension forms and tectonic *** analysis was performed by integrating the results obtained from geology,gravity,wave velocity ratio,Global Position System(GPS),and geothermal *** results showed that(1)the Dongzhong-Xiaodong fault(DXf),the eastern Fangcheng-Lingshan fault(FLf2),and the eastern Hepu-Beiliu fault(HBf2)were all trans-crustal deep faults,and crust-mantle ductile shear zones developed in the deep *** electrical boundary zones,DXf and HBf2,were *** inclined towards the northwest,while HBf2 inclined towards the *** FangchengLingshan fault(FLf)exhibits a tectonic style resembling a“flower”shape in the upper *** the deeper section,it is characterized by an electrical boundary zone that gradually slopes towards the southeast direction.(2)The Hunan-guangxi Passive Continental Margin(HGPCM)on the NW side of DXf had a stratified resistivity structure and relatively stable Bouguer gravity anomalies,which conformed to the quasi-craton tectonic attribute of the local failure at the southeastern margin of the Yangtze Block(YB).The southeastern side of this bloc

关键词： South China Block Qinzhou-Fangcheng Junction Zone Magnetotelluric 1936 Lingshan M6^(3/4)earthquake Deep seismogenic environment

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First report of theropod materials enriches the dinosaur assemblages in guangxi and expands the dinosaur distribution to the southernmost China

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China Geology 2025年第1期8卷 233-234页

作者： Xu-ri Wang Shu-bin Ju Yan-nan Ji Zhen Guo Qiang Ji Key Laboratory of Stratigraphy and Paleontology of the Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Hebei GEO University Shijiazhuang 050031China Dalian Natural History Museum Dalian 116023China Chinese Academy of geological Sciences Beijing 100037China

*** Dinosaur fossils were first discovered from guangxi zhuang autonomous region in 1960s,mainly including fossil bones and teeth from the *** one dorsal vertebra and one ischium were reported from the Late Jurassic a... 详细信息

关键词： Island Cretaceous Jurassic

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Landslide integrated characteristics and susceptibility assessment in Rongxian county of guangxi,China

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Journal of Mountain Science 2019年第3期16卷 657-676页

作者： LIAO Li-ping ZHU Ying-yan ZHAO Yan-lin WEN Hai-tao YANG Yun-chuan CHEN Li-hua MA Shao-kun XU Ying-zi College of Civil Engineering and Architecture Guangxi University Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education Guangxi University guangxi Key Laboratory of Disaster Prevention and Engineering Safety Guangxi University Key Laboratory of Mountain Hazards and Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences guangxi zhuang autonomous region geological Environmental Monitoring Station

Landslides distribute extensively in Rongxian county, the southeast of guangxi province, China and pose great threats to this county. At present, hazard management strategy is facing an unprecedented challenge due to lack of a landslide susceptibility map. Therefore, the purpose of this paper was to construct a landslide susceptibility map by adopting three widely used models based on an integrated understanding of landslide’s *** models include a semi-quantitative method(SQM), information value model(IVM) and logistical regression model(LRM).The primary results show that(1) the county is classified into four susceptive regions, named as very low, low, moderate and high, which covered an area of 13.43%, 32.40%, 31.19% and 22.99% in SQM, 0.86%, 26.82%, 44.11%, and 28.21% in IVM, 9.88%, 17.73%, 46.36% and 26.03% in LRM;(2) landslides are likely to occur within the areas characterized by following obvious aspects: high intensity of human activities, slope angles of 25°～35°, the thickness of weathered soil is larger than 15 m; the lithology is granite, shale and mud rock;(3) the area under the curve of SQM, IVM and LRM is 0.7151, 0.7688 and 0.7362 respectively, and the corresponding success rate is 71.51%, 76.88% and 73.62%. It is concluded that these three models are acceptable because they have an effective capability of susceptibility assessment and can achieve an expected accuracy. In addition, the susceptibility outcome obtained from IVM provides a slightly higher quality than that from SQM, LRM.

关键词： Landslide characteristic Susceptibility zonation Prevention regionalization Rongxian county

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Ecological risk assessment of Cd and other heavy metals in soil-rice system in the karst areas with high geochemical background of guangxi,China

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Science China Earth Sciences 2021年第7期64卷 1126-1139页

作者： Qiong YANG Zhongfang YANG Qizuan ZHANG Xu LIU Xiaoxiong ZHUO Tiansheng WU Lei WANG Xueji WEI Junfeng JI School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China guangxi Bureau of Geology&Mineral prospecting&Exploitation Nanning 530023China guangxi institute of geological Survey Nanning 530023China Geology Team No.4 of guangxi zhuang Autonomic region Nanning 530031China guangxi Geophysical Investigation institute Liuzhou 545005China Key Laboratory of Surficial Geochemistry Ministry of EducationSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China

Karst areas are widely distributed in China,and the soil derived in these areas is enriched with trace elements and has the typical characteristics of high geochemical ***,soil ecological risk has gradually attracted extensive *** this study,1090 sets of rice grains and paired rhizosphere soils were collected as research objects from the outcropped karst areas of carbonate rocks in guangxi,and the concentration characteristics and influencing factors of heavy metals,such as Cd and As,in rice grains and the corresponding soils were *** to the Chinese Soil Environmental Quality Standard(GB 15618-2018),the proportion of karstic soil samples in guangxi with heavy metal(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)concentrations that exceed the standard risk screening values was generally greater than that of surface soils in China or non-karstic soils in ***,Cd and As were the most prominently enriched heavy metals in *** to the Chinese Food Safety Standard(GB 2762-2017),Pb in rice grains from the studied area did not exceed the standard;the exceedance rates of Cr,Hg,and inorganic As were only about 1%;and the exceedance rate of Cd was 12.5%.Soil Cd concentration increased gradually whereas the concentration and exceedance rate of Cd in rice grains decreased gradually with the increase of soil ***,the exceedance rate of Cd in rice grains was only 4%when soil pH>*** results indicated that the risk screening values of Cd element in the Chinese Soil Environmental Quality Standard are not satisfactorily applicable to the ecological risk assessment of Cd in karstic ***,the recommended threshold values for the safe utilization and risk control of Cd in karstic soils was proposed so as to provide a basis for soil environmental quality hierarchization,pollution risk control and land safety zoning of agricultural land in karst areas in China.

关键词： Heavy metals Soil Rice grain Ecological risk assessment Karst area in guangxi High geochemical background

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What Controls the Distribution of Ore Veins in Quartz Vein-type Tungsten Deposits: Constrains from Fan-shaped Mineralization in SE China

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Journal of Earth Science 2024年

作者： Gui-Cong Fang Deng-Hong Wang Fu-Qiang Yang Zhan-Xu Ni Chang-Shuai Huang Ping Wang Meng Feng Zuo-Hai Feng guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration， College of Earth Science， Guilin University of Technology Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources By the Province and Ministry，Guilin University of Technology institute of Mineral Resources， Chinese Academy of geological Sciences guangxi zhuang autonomous region institute of Geophysical Exploration geological Team No.271 of guangxi zhuang autonomous region China Nonferrous Metal Guilin Research institute of Geology for Mineral Resources Co.， Ltd Guangdong Geologic Survey institute

Quartz vein-type tungsten deposits are a common W deposit type. Their ore vein distribution was previously considered to be controlled by regional horizontal tectonic stress. In this paper， 14 tungsten deposits with fan-shaped mineralization in SE China are summarized， and the relations between their ore veins and granite and the ore-forming structural stress field are analyzed. These deposits have a post-magmatic hydrothermal genesis and involve the formation of two sets of veins with similar strike and opposite dips at the top of the ore-causative granite bodies， forming a vertical fan-shaped profile. Their ore veins were coeval with the underlying granite bodies， and generally extend along the long axis of the granite. In such fan-shaped ore formation， the stress is highly focused at the top of the granite and gradually weakens outward. The maximum principal stress (σ1) is perpendicular to the granite contact surface， and radiates outward from the pluton. Meanwhile， the minimum principal stress (σ3) forms an arc-shaped band parallel to the contact surface. Our findings， together with published numerical modeling indicate that the emplacement dynamics of granitic magma (rather than regional horizontal tectonic stress) are essential controls on the distribution of ore veins in quartz vein-type tungsten deposits.

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Ecosystem-driven karst carbon cycle and carbon sink effects

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Journal of Groundwater Science and Engineering 2022年第2期10卷 99-112页

作者： Cheng Zhang Qiong Xiao Ze-yan Wu Knez Martin Karst Dynamics Key Laboratory of Ministry of Natural Resources/guangxi zhuang autonomous region Institute of Karst GeologyChinese Academy of Geological Sciences/International Research Center on Karst Under the Auspices of UNESCOGuilin 541004GuangxiChina Karst Research institute Slovenian Academy of Sciences and ArtsPostonja弘6230Slovenia

It is recognized that karst processes are actively involved in the current global carbon cycle based on twenty years research,and the carbon sink occurred in karst processes is possibly an important part of“missing sink”in global carbon *** this paper,an overview is given on karst carbon cycle research,and influence factors,formed carbon pools(background carbon sink)and sink increase potentials of current karst carbon cycle are *** weathering could contribute to the imbalance item(BIM)and land use change item(ELUC)in the global carbon cycle model,owing to its uptake of both atmospheric CO_(2)(carbon sink effect)and CO_(2) produced by soil respiration(carbon source reduction effect).Karst carbon sink includes inorganic carbon sink resulted from hydrogeochemical process and organic carbon sink generated by aquatic photosynthetic DIC conversion,forming relatively stable river(reservoir)water body or sediment carbon *** sizes of both sinks are controlled by terrestrial ecosystems and aquatic ecosystems,*** rehabilitation and carbon sequestration by aquatic plants are two effective ways to increase the carbon sink in karst *** is estimated that the rate of carbon sink is at least 381000 t CO_(2)/a with vegetation restoration and afforestation in southwest China karst area,while the annual organic carbon sink generated by aquatic photosynthesis is about 84200 t C in the Pearl River *** development of a soil CO_(2) based model for assessment of regional dissolution intensity will help to improve the estimation accuracy of carbon sink increase and potential,thus provide a more clear and efficient karst sink increase scheme and pathway to achieve the goals of“double carbon”.With the deep investigation on karst carbon cycle,mechanism and carbon sink effect,and the improvement of watershed carbon sink measurement methods and regional sink increase evaluation *** carbon sink is expected to be included in t

关键词： Karst carbon sink Ecosystem Sink-increase way Carbon pool Rock desertification rehabilitation Aquatic photosynthetic carbon sequestration

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Comparative study of carbonic anhydrase activity in waters among different geological eco-environments of Yangtze River basin and its ecological significance

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Journal of Environmental Sciences 2018年第4期30卷 173-181页

作者： Sila Onesmus Nzung'a Weizhi Pan Taiming Shen Wei Li Xiaoqun Qin Chenwei Wang Liankai Zhang Longjiang Yu institute of Resource Biology and Biotechnology Department of Biotechnology College of Life Science & Technology Huazhong Universityof Science & Technology Wuhan 430074 China institute of Karst Geology Chinese Academy of Geological Sciences Guilin 541004 China Key Laboratory of Karst Dynamics Ministry of Land and Resources/Guangxi Zhuang Autonomous Region Guilin 541004 China Teachers Searvice Commission-Kenya P.O. Box Private Bag 00100 Nairobi Kenya

This study provides the presence of carbonic anhydrase（CA） activity in waters of the Yangtze River basin, China, as well as the correlation of CA activity with HCO-3 concentration and CO2 sink flux. Different degrees of CA activity could be detected in almost all of the water samples from different geological eco-environments in all four seasons. The CA activity of water samples from karst areas was significantly higher than from non-karst areas（PP3-concentration（r = 0.672, P2 sink flux（r = 0.602, P = 0.076） in karst areas. This suggests that CA in waters might have a promoting effect on carbon sinks for atmospheric CO2 in karst river basins. In conditions of similar geological type, higher CA activity was generally detected in water samples taken from areas that exhibited better eco-environments, implying that the CA activity index of waters could be used as an indicator for monitoring ecological environments and protection of river basins. These findings suggest that the role of CA in waters in the karst carbon sink potential of river basins is worthy of further in-depth studies.

关键词： Yangtze River basin Carbon sink Eco-environments Water body Carbonic anhydrase(CA)

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Groundwater resources in karst area in Southern China and sustainable utilization pattern

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Journal of Groundwater Science and Engineering 2016年第4期4卷 301-309页

作者： XIA Ri-yuan institute of Karst Geology Chinese Academy of Geological SciencesMinistry of Land and ResourcesGuangxi Zhuang Autonomous Region Karst Dynamics Key Laboratory

Occurrence conditions of groundwater in southern karst area are complicated. The water-bearing media in the karst have multiplicity, and the groundwater is hosted in holes, gaps, seams, pipes and caves. The karst water shows heterogeneity where fast and slow flow coexist, and the Darcy and non-Darcy flow coexist, and the liquid flow, the gas flow and solid flow coexist. The evaluation and investigation indicates that the mineable resource of karst groundwater is about 53.44 billion m^3/y, and the current exploitation quantity is merely 6.565 billion m^3/year. The exploitation and utilization potential is gigantic. In the region there are altogether 2 763 karst subterranean rivers with a total length of 12 687 km. The dry season runoff volume equals to 47 billion m^3/year. At present the exploitation is only 10%. Four effective utilization models of karst groundwater resources have been put forward.(1) The karst hills-depression zone formed the surface-underground united reservoir. By digging tunnels, water diversion irrigation and generating electricity, the ecological economy is developed.(2) In the deep-cut peak cluster depression area, by using the high-part Epikarst spring and constructing the regulation and storage water tank, the stereo ecological agriculture is developed.(3) In the karst peak forest plain and hilly-gully area, the pump-type underground regulating reservoir is constructed and the water-saving ecological agriculture is strengthened.(4) In the fault basin region with the surrounding groundwater runoff belting beam backwater, the water resources are jointly controlled to develop a fruit crop base within the basin.

关键词： Karst area Subterranean river Water resources Sustainable utilization

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