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Origin of the Yueguang gold deposit in Xinhua, hunan province, South China: insights from fl uid inclusion and hydrogen–oxygen stable isotope analysis

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Acta Geochimica 2024年第2期43卷 235-254页

作者： Hongxin Fan Qiang Wang Yulong Yang Yao Tang Hao Zou College of Earth Sciences Chengdu University of TechnologyChengdu 610059China College of Earth Sciences Jilin UniversityJilin 130061China

The Yueguang gold deposit is located in Fengjia,Xinhua County,hunan province,South *** represents a recently discovered small-scale gold deposit situated in the southwestern region of the Jiangnan Orogenic Belt,west of the Baimashan granitic *** order to discern the characteristics of the ore-formingﬂuids,the underlying mineralization processes,and establish a foundation for the origin of the Yueguang gold depositﬂuid inclusion micro-thermometry,as well as quartz hydrogen and oxygen isotope analysis,have been carried out on samples obtained from various stages of *** hydrothermal miner-alization stages within the Yueguang gold deposit can be categorized into three stages:(i)the barren,pre-ore quartz-pyrite stage(Stage Ⅰ),the quartz-pyrite-gold stage(Stage Ⅱ),and the post-ore quartz-carbonate stage(Stage Ⅲ),with the second stage being the main mineralization ***ﬂuid inclusions identiﬁed in samples from the main min-eralization stage can predominantly be described with the NaCl–H_(2)O and CO_(2)–NaCl–H_(2)O *** inclusions display homogenization temperatures ranging from 158.8 to 334.9℃,and theﬂuid salinity ranges from 0.3%to 4.0%(wt.%NaCl equiv.).Laser Raman spectroscopy analysis of individual inclusions further reveals the presence of gas-phases such as CO_(2),CH_(4),and N_(2).Isotopic analysis indicatesδ^(18)Oﬂuid values ranging from 3.95 to 6.7‰ and δDH_(2)O values ranging from-71.9 to-55.7‰.These results indi-cate that the ore-formingﬂuid of the Yueguang gold deposit belongs to metamorphic hydrothermalﬂuids of middle-low temperature and low *** the process of ore formation,gold is transported in the form of Au(HS)2-complexes,with gold deposition being driven byﬂuid ***,the Yueguang gold deposit is categorized as an orogenic gold deposit dominated by metamorphic hydrother-malﬂ*** may become a new target for gold exploration in the Baimashan region,central hunan province.

关键词： hunan province Yueguang gold deposit Fluid inclusions Hydrogen–oxygen isotopes Laser Raman Fluid immiscibility Orogenic gold deposit

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Estimating health damage cost from secondary sulfate particles—a case study of hunan province,China

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Journal of Environmental Sciences 2003年第5期15卷 611-617页

作者： HAO Ji ming, LI Ji, YE Xue mei, ZHU Tian le (Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. ) Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

China's coal dominated energy pattern has resulted in large amount of SO 2 emissions. Estimate of the sulfur related health damage cost is necessary to help perform systematic cost benefit analysis and set national energy and emissions control priorities. Current researches were confined to gaseous SO 2 in urban areas; however, secondary sulfate (SO 2- 4) particles can exert serious impact in a wider region. Based on the concept of “intake fraction', CALPUFF long range dispersion model and 180 sample emission sources, multiple regression equation was obtained with good correlation( r =0 85), which illustrates that populations were key parameters to determine intake fraction but source characteristics were insignificant. Based on the formula and the population distribution data, county level intake fractions were mapped for hunan province(range: 1 1×10 -6 -3 2×10 -6 ) of China. A combination of county level SO 2 emissions with the intake fractions yields a total 1 98 tons of sulfate(SO 2- 4) inhalation, and resulting total health damage cost to be 0 76(willingness to pay approach, WTP) or 0 16(human capital approach, HC) billion USD in 1997, about 2.1% or 0 45% of GDP in hunan in 1997. Average health damage cost per ton of SO 2 emission is 930(WTP) or 200 USD(HC). The results demonstrated that more stringent regulation should be forced.

关键词： intake fraction health impact hunan province sulfate regression analysis

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Fixed Ammonium in Major Types of Paddy Soils in hunan province, China

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Pedosphere 2003年第3期13卷 199-208页

作者： ZHANG YANGZHU, LIAO JIPEI, SUN YUHUAN, FENG YUEHUA and HUANG YUNXIANGCollege of Resources and Environment, hunan Agricultural University, Changsha 410128 (China) College of Resources and Environment Hunan Agricultural University Changsha 410128

The contents, affecting factors, seasonal changes and availability of fixed ammonium in major types ofpaddy soils derived from different parent materials in hunan province, China, were studied using the Silva-Bremner method by laboratory and pot experiments. Results showed that the content of fixed ammoniumin the plough horizons ranged from 88.3 mg kg-1 to 388.1 mg kg-1, with 273.2 ± 77.7 mg kg-1 on average,accounting for 11.2% of total soil N on average. Content of fixed ammonium decreased in the order of newlylacustrine clayey paddy soil ＞ alluvial sandy paddy soil ＞ purple clayey paddy soil ＞ newly alluvial sandypaddy soil ＞ yellow clayey paddy soil ＞ reddish-yellow clayey paddy soil ＞ granitic sandy paddy soil. Therewere four distribution patterns of fixed ammonium in the profiles to 1-m depth, i.e., increase with the depth,decrease with increasing depth, no distinct change with the depth, and abrupt increase or decrease in somehorizon. Percentage of fixed ammonium in total N increased with the depth in most of the soils. Fixationof NH4+ by soil was higher at 30 ℃ than at 20 ℃ and 40 ℃, and continuous submergence benefited thefixation of NH4+ in newly alluvial sandy paddy soil, purple clayey paddy soil and alluvial sandy paddy soil,while alternating wetting and drying contributed to the fixation of NH4+ in yellow clayey paddy soil *** ammonium content in the test paddy soils was significantly correlated with ＜ 0.01 mm clay content(P ＜ 0.05), but not with ＜ 0.001 mm clay content, total N, organic N and organic matter. Fixed ammoniumcontent varied with rice growth stages. Application of N fertilizer promoted fixation of NH4+ by soil, and Nuptake by rice plant promoted release of fixed ammonium from the soil. Recently fixed ammonium in paddysoil after N fertilizer application was nearly 100% available to rice plant, while native fixed ammonium wasonly partly available, varying with the soil type and rice type.

关键词： affecting factors bioavailability fixed ammonium hunan province paddysoil

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Assessment on the component pattern of mountain vacation potential suitability in hunan province, China

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Journal of Mountain Science 2022年第3期19卷 892-908页

作者： DU Ting-ting LI Da-li ZHONG Yong-de Forestry College Central South University of Forestry and TechnologyChangsha 410004China Dean's Office Hunan Network Engineering Vocational CollegeChangsha 410004China National Forestry and Grassland Administration State Forestry Administration Engineering Research Center for Forest tourism Changsha 410004China

In China,mountain destinations offer more opportunities for vacation than beaches and springs,with a larger national coverage,richer landscapes and various diverse folk *** province,for example,serves as a typical mountain tourism *** research aims to assess the potential suitability and component pattern of holidaymaking in hunan province to support for scientific endeavors and sustainable use of mountain resources in *** approach for mapping potential suitability was constructed based on Weighted Linear Combination(WLC)of six primary factors including terrain,climate suitability period,biology and environment,human activity culture,hydrological landscape,and road infrastructure,which is calculated on the base of eleven secondary factors used as suitability *** hierarchy process(AHP)and geographic information system(GIS)were also integrated into the evaluation models to prepare six single and complex factor suitability maps for mountain *** clustering was used to clarify the component pattern of single factor combinations in each mountain vacation suitability index(MVSI)*** results have shown that:1)Regions with high suitability are distributed with characteristics of significant dispersion and limited aggregation;2)15.89%of the sample mountains are highly suitable,30.78%are moderately suitable,42.61%are marginally suitable and 10.72%are poorly suitable;3)The complexity of index combination corresponding to each level is different;4)Different combinations emphasize different destination *** study reveals the suitability class,characteristics,and limiting factors of mountain vacation in different geographical locations on the provincial *** elements play an instructive role in scientific decision-making and orderly exploitation of resources among hunan’s Mountain ***,the study can also be used as a basis for the suitability evaluation of mountain vacation in other ar

关键词： Mountain vacation Suitability evaluation Component pattern Analytic hierarchy process Geographic information system hunan province

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Forest height mapping using inventory and multi-source satellite data over hunan province in southern China

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Forest Ecosystems 2022年第1期9卷 57-70页

作者： Wenli Huang Wankun Min Jiaqi Ding Yingchun Liu Yang Hu Wenjian Ni Huanfeng Shen School of Resource and Environmental Sciences Wuhan UniversityHubei430079China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing100101China College of Urban and Environmental Sciences Peking UniversityBeijing100871China Academy of Inventory and Planning National Forestry and Grassland AdministrationBeijing100714China School of Ecology and Environment Ningxia UniversityYinchuan750021China Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China Ningxia UniversityYinchuan750021China Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education Ningxia UniversityYinchuan750021China

Background:Accurate mapping of forest canopy heights at a fine spatial resolution over large geographical areas is *** is essential for the estimation of forest aboveground biomass and the evaluation of forest *** current regional to national scale forest height maps were mainly produced at *** maps lack spatial details for decision-making at local *** advances in remote sensing provide great opportunities to fill this ***:In this study,we evaluated the utility of multi-source satellite data for mapping forest heights over hunan province in China.A total of 523 plot data collected from 2017 to 2018 were utilized for calibration and validation of forest height ***,the relationships between three types of in-situ measured tree heights(maximum-,averaged-,and basal area-weighted-tree heights)and plot-level remote sensing metrics(multispectral,radar,and topo variables from Landsat,Sentinel-1/PALSAR-2,and SRTM)were *** types of models(multilinear regression,random forest,and support vector regression)were *** variables were selected by two types of variable selection approaches(stepwise regression and random forest).Model parameters and model performances for different models were tuned and evaluated via a 10-fold cross-validation ***,tuned models were applied to generate wall-to-wall forest height maps for hunan ***:The best estimation of plot-level tree heights(R2 ranged from 0.47 to 0.52,RMSE ranged from 3.8 to 5.3 m,and rRMSE ranged from 28%to 31%)was achieved using the random forest model.A comparison with existing forest height maps showed similar estimates of mean height,however,the ranges varied under different definitions of forest and types of tree ***:Primary results indicate that there are small biases in estimated heights at the province *** study provides a framework toward establishing regional to national scale maps of

关键词： Forest canopy height hunan province Landsat ARD PALSAR-2 Sentinel-1

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Tin partition behavior and implications for the Furong tin ore formation associated with peralkaline intrusive granite in hunan province,China

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Acta Geochimica 2016年第2期35卷 138-147页

作者： Xiaoyan Hu Xianwu Bi Ruizhong Hu Guosheng Cai Youwei Chen State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guizhou Bureau of Nonferrous Metal and Nuclear Industry Geological Exploration

Tin deposits are often closely associated with granitic intrusions. In this study, we analyzed tin partition coefficients between different fluids and melts(D)as well as various crystals and melts D(D)from the Furong tin deposit associated with the Qitianling A-type granite. Our experimental results indicate that tin partition behavior is affected by the chemical compositions of fluids, melts, and minerals. Tin is prone to partitioning into the residual magma in fractional crystallization or other differential magmatic processes if the magma originated from crustal sources with high alkali content, high volatile content, and low oxygen fugacity. Highly evolved residual peralkaline granitic magma enriched in tin can lead to tin mineralization in a later stage. Furthermore, the volatiles F and Cl in the magma play important roles in tin partitioning behavior. Low F contents in the melt phase and high Cl content in the aqueous fluid phase are favorable factors for tin partitioning in the aqueous fluid phase. High Cl content in the aqueous fluid catalyzes water–rock interaction and leads to the extraction of tin from tinbearing minerals. All these findings support a hydrothermal origin for the tin deposits. In light of the geotectonic setting, petrochemical characteristics, and mineralizing physicochemical conditions of the Furong tin deposit, it is inferred that the ore-forming fluid of the Furong tin ore deposit could have derived from the Qitianling peralkaline intrusion.

关键词： Tin Partition Peralkaline granite hunan province

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Spatial Differentiation and Influencing Factors of Poverty Alleviation Performance Under the Background of Sustainable Development:A Case Study of Contiguous Destitute Areas in hunan province,China

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Chinese Geographical Science 2021年第6期31卷 1029-1044页

作者： TAN Xuelan YU Hangling AN Yue WANG Zhenkai JIANG Lingxiao REN Hui College of Resources and Environment Hunan Agricultural UniversityChangsha410128China

Poverty eradication is a realistic requirement for the addressing of the urban-rural development *** consolidates the achievements of the poverty alleviation,and accelerates the realization of the United Nations Sustainable Development *** research that deals with poverty,qualitative analysis is often used to study the connection between a single influencing factor and poverty reduction,and to solve regional poverty through government ***,these studies usually ignore the multidimensional nature of poverty,and the fact that poverty alleviation also needs to be approached from multiple *** constructing a theoretical framework of poverty alleviation performance from the perspective of sustainable development,this study selects contiguous poverty-stricken areas in the hunan province,China as the empirical study area,constructs an evaluation index system from the three dimensions of economic development,infrastructure and people’s livelihood security,and selects influencing factors from three aspects of‘population’,‘land’and‘industry’.The spatial differentiation characteristics and influencing factors of poverty alleviation performance in poverty-stricken areas were studied by using the methods of entropy weight method and *** results show:firstly,in the concentrated and contiguous poverty-stricken areas of the hunan province,the performance of poverty alleviation in the economic development makes little difference,showing a‘high-medium-low’cross-distribution *** poverty alleviation performance of the infrastructure presents a distribution pattern of‘low in the middle and high on both *** poverty alleviation performance of people’s livelihood security has significant spatial differentiation characteristics,which all present a reunion *** overall poverty alleviation performance varies greatly,showing a funnel-shaped distribution in ***,the spatial differentiation of poverty alleviatio

关键词： poverty alleviation performance space differentiation geodetector influencing factors hunan province

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SPATIAL DISTRIBUTION AND VARIATION TENDENCY OF DROUGHTS AND FLOODS IN hunan province DURING THE PAST 36 YEARS

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Journal of Tropical Meteorology 2011年第4期17卷 385-391页

作者：张剑明章新平黎祖贤张健肖艳刘燚周伟 Zhuzhou Meteorological Bureau College of Resources and Environment Sciences Hunan Normal University hunan Meteorological Observatory Liling Meteorological Bureau

Using the 1970-2005 annual precipitation and evaporation data at 80 gauge stations across hunan province,this work analyzes the spatial distribution and variation tendency of the local droughts and floods using linear regression,wavelet analysis,abrupt change,clusters,Empirical Orthogonal Function (EOF) and rotated EOF (REOF).Results show that there are four dry areas and three wet areas in *** whole province exhibits a moistening trend except some small areas in western,eastern and southern *** most prominent feature of annual precipitation is that the whole province basically displays a consistent variation tendency,as far as the dominant EOF mode is *** addition,the spatial features of the other EOF modes include dry-wet differences,*** (or dry) in the north versus dry (or wet) in the south,wet (or dry) in the center and dry (or wet) in the surrounding *** distribution of the ratios of evaporation to precipitation exhibits both common features as well as spatial differences,which can be classified into four types:South hunan,North hunan,Northeast hunan,and Central *** is an abrupt change from dry to wet patterns in the early ***,the drought-flood distribution presents variations of three *** the late 2000s,hunan province will be in a period of drought,followed by a period of flood.

关键词： spatiotemporal characteristics REOF Morlet analysis hunan province drought and flood

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Types of uranium deposits in central Zhuguang Mountains in hunan province,South China and their metallogenic regularity and prospecting directions

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China Geology 2020年第3期3卷 411-424页

作者： Zhen-hua Xiao Shen-bang Xiong Chun-hua Li Ying Liu Zhong-ding Yang Xiao-xi Feng Xue-wen Liu No.302 Brigade of hunan Nuclear Geology Chenzhou 432000China East China University of Technology Nanchang 330013China Tianjin Center China Geological SurveyMinistry of Natural ResourcesTianjin 300170China

The central Zhuguang Mountains in hunan province is located at the junction of the three provinces,namely hunan,Jiangxi,and Guangdong,where the famous Lujing uranium ore field *** uranium deposits occurring in this area are all granite-related and they can be divided into three types,namely endogranitic ones,perigranitic ones,and contact zone *** endogranitic uranium deposits are mainly controlled by the structural alteration zones developing within granites,with fragmentation,hematitization,and alkali metasomatism as their main mineralization *** perigranitic uranium deposits are mainly produced in the carbonaceous,siliceous,and argillaceous composite layers of epimetamorphic rocks and are controlled by fractured zones formed due to interlayer *** contact zone type uranium deposits mainly occur in the contact parts between the granites and favorable *** have developed in favorable sections where multiple sets of structures are combined and *** main metallogenic regularities of uranium in the central Zhuguang Mountains are as *** basic conditions for the uranium mineralization in this area include the framework consisting of regional deep large faults and their associated multi-set multi-direction favorable metallogenic structures,multi-cycle and multi-stage uranium-rich rock masses,and uranium-rich folded ***,the uranium deposits in this area are closely related to granites in terms of genesis and space and they are formed in different structural parts subject to the same ***,based on the summary of the characteristics and regularities of uranium mineralization in this area,the controlling factors of different types of uranium deposits in the area were explored and six metallogenic target areas were *** these will provide references for the exploration of uranium deposits in this area.

关键词： Uranium deposits Magmatic hydrothermal type Metallogenic regularity Mineral exploration engineering Prospecting direction Zhuguang Mountain hunan province South China

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Fixed Ammonium Content and Maximum Capacity of Ammonium Fixation in Major Types of Tillage Soils in hunan province,China

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Agricultural Sciences in China 2007年第4期6卷 466-474页

作者： ZHANG Yang-zhu HUANG Shun-hong WAN Da-juan HUANG Yun-xiang ZHOU Wei-jun ZOU Ying-bin College of Resources and Environment Hunan Agricultural University Changsha 410128 P.R.China College of Metallurgical Science and Technology Central South University Changsha 410083 P.R.China College of Resources and Environment Sciences Hunan Normal University Changsha 410081 P.R.China Institute of Rice Hunan Agricultural University Changsha 410128 P.R.China

In order to understand the status of fixed ammonium, fixed ammonium content, maximum capacity of ammonium fixation, and their influencing factors in major types of tillage soils of hunan province, China, were studied with sampling on fields, and laboratory incubation and determination. The main results are summarized as follows：（1） Content of fixed ammonium in the tested soils varies greatly with soil use pattern and the nature of parent material. For the paddy soils, it ranges from 135.4 ± 57.4 to 412.8±32,4 mg kg^-1, with 304.7±96.7 mg kg^-1 in average; while it ranges from 59.4 to 435.7 mg kg^-1, with 230.1 ± 89.2 mg kg^-1 in average for the upland soils. The soils developed from limnic material and slate had higher fixed ammonium content than the soils developed from granite. The percentage of fixed ammonium to total N in the upland soils is always higher than that in the paddy soils. It ranges from 6.1 ±3.6% to 16.6±4.6%, with 14.0% ±5.1% in average for the paddy soils and it amounted to 5.8±2.0% to 40.1 ± 17.8%, with 23.5 ± 14.2% in average for upland soils. （2） The maximum capacity of ammonium fixation has the same trend with the fixed ammonium content in the tested soils. For all the tested soils, the percentage of recently fixed ammonium to maximum capacity of ammonium fixation is always bellow 20% and it may be due to the fact that the soils have high fertility and high saturation of ammonium-fixing site. （3） The clay content and clay composition in the tested soils are the two important factors influencing their fixed ammonium content and maximum capacity of ammonium fixation. The results showed that hydrous mica is the main 2：1 type clay mineral in 〈 0.02 mm clay of the paddy soils, and its content in 0.02-0.002 mm clay is much higher than that in 〈 0.002 mm clay of the soils. The statistical analysis showed that both the fixed ammonium content and the maximum capacity of ammonium fixation of the paddy soils were positively correlated with the total 2：1

关键词： hunan province tillage soils paddy soil upland soil fixed ammonium maximum capacity of ammonium fixation

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