Geochemical Indication of Sinian Bedded Siliceous Rocks in the Hunan-Guizhou-Guangxi Area and Their Environmental Significance

: In the Hunan-Guizhou-Guangxi area there have developed very thick bedded siliceous rocks of the late Sinian. The rocks have a fairly pure composition, with an average content of siliceous minerals exceeding 95%. They are relatively rich in Fe and Mn, and poor in Al, Ti and Mg. The Fe/Ti, (Fe+Mn)/Ti, Al/(Al+Fe+Mn) and U/Th ratios and the Al-Fe-Mn and Fe-Mn-(Ni+Co+Cu)×10 triangle diagrams all show that they are hydrothermal sedimentary siliceous rocks. In the rocks the total amount of REEs is low, the δCe shows an obvious negative anomaly and the δEu a weak anomaly, and LREE>HREE, all indicating that they are products of hydrothermal processes. The δ30Si and δ18O values, as well as the formation temperature of the rocks all clearly show that the silica forming the rocks comes from hot water. Besides, analyses of the depositional environment of the rocks using the MnO/TiO2 ratio and the δCe and δ30Si values yield the same conclusion that they are formed in environments from continental marginal slopes of a bathyal environment to oceanic basins of a deep-sea environment.

Facies-succession and architecture of the third-order sequences and their stratigraphic framework of the Devonian in Yunnan-Guizhou-Guangxi area,South China

The Caledonian orogeny at the end of the Silurian resulted in great changes in the palaeogeography in the Yunnan-Guizhou-Guangxi area of South China; the continental area of the Early Paleozoic evolved into the extensive Dian-Qian-Gui Sea in the Late Paleo-zoic. Early in the Devonian, as a result of a major transgression, seawater encroached gradually from the south to the north and clastic facies were deposited. Carbonate deposition was then established in the Yunnan-Guizhou-Guangxi area, with a palaeogeography marked by attached platforms, isolated platforms and narrow basins. As a result of the Ziyun movement towards the end of the Devonian, the Upper Devonian strata are regressive and thin out from the open-sea to the land areas. A study of the nature and distribution of sedimentary facies in space and time recognises 13 third-order sequences in the Devonian strata in Yunnan-Guizhou-Guangxi area, and these form two second-order sequences. The strata of the Lower Devonian comprise 5 third-order sequences (SQ1 to SQ5 ), which are dominated by transgressive clastics. 4 third-order sequences (SQ6 to SQ9 ) in the Middle Devonian are characterized by alternations of transgressive clastics and highstand carbonates. In the Upper Devonian, carbonates constitute 4 third-order sequences (SQ10 to SQ13 ), which are generally marked by the transgressive limestones and highstand dolomites. On the basis of earlier biostratigraphic studies, sea-level changes represented by the third-order sequences with their different facies successions are explored, and the sequence stratigraphic framework is established. There-fore, the Devonian strata in the study area provide an example for further understanding of depositional trends within the sequence-stratigraphic framework.

Detrital Zircon U-Pb Geochronologyof Sinian–Cambrian Strata in the Eastern Guangxi Area, China

The Eastern Guangxi area locates in the southwestern part of the transition zone between Yangtze and Cathaysia blocks, which is an important region because the boundary between two blocks probablycrosses there. We determined LA-ICPMS U-Pb ages for detrital zircons extracted from three sandstone samples in the Sinian-Cambrian strata in this region. The resulting ages are in the range of the Archeozoic and Neoproterozoic, with three notable concentrates at 991 Ma, 974 Ma, and 964 Ma, all of which are coeval to the Grenvillian magmatic activity. The new age distribution is similar to the data reported in the Precambrian strata of the adjacent southwestern Cathaysia Block, suggesting that most of our detrital zircons are likely derived from the Cathaysia Block. Combined with others＇ research, we are more inclined to accept the opinion that there was not an ocean basin between the two blocks during the Sinian-Cambrian period in Eastern Guangxi area if the timing of collision is the Early Neoproterzoic. But if the timing of collision is the Early Paleozoic, we conclude that Luzhai uplift（i.e., the uplift between Guilin-Yongfu faultand Lipu fault） beyond the west of Dayaoshan regoin might be one part of southwestern sedimentation boundary of Cathaysia Block and Yangtze Block. We also get a few of detrital zircons with ages of ~590 Ma which probably sourced from northeastern Gondwana and 13 detrital zircons with over 3 000 Ma U-Pb ages which record the early formation of the earth.

Relation between Atmospheric Deposition and Accumulation of Heavy Metals in Rice in Mining Areas of Guangxi

Firstly, the concept, sources and damage of atmospheric deposition were introduced, and then the relation between atmospheric deposition and accumulation of heavy metals in rice in Guangxi was analyzed to provide reference for the implementation of effective risk early warning of pollution from heavy metal deposition and safe production of rice in mining areas of Guangxi.

Geochemical Tracing of Ore-forming Material Sources of Carlin-type Gold Deposits in the Yunnan-Guizhou-Guangxi Triangle Area --A Case Study of the Application of the Combined Silicon Isotopes Geochemistry and Siliceous Cathodoluminescence Analysis

Abstract This paper deals with characteristics of silicon isotope compositions and siliceous cathodoluminescence of host rocks, ores and hydrothermal silicified quartz of the Carlin-type ore deposits in the Yunnan-Guizhou-Guangxi triangle area. The study shows that primary silicified quartz is nonluminescent but quartz in host rocks and secondary silicified quartz are luminescent by the action of cathode rays. Correspondingly, silicon isotope compositions of host rocks, ores and hydro6thermal quartz veins are clearly distinguished. In strata from the Middle Triassic to the “Dachang” host bed, δ30Si of the host rocks ranges from 0.0% ?0.3%, while that of primary ore-forming silicified fluids from ?0.1% to ?0.4%; in the Upper Permian and Lower Carboniferous strata and Indosinian diabase host beds, δ30Si of the host rocks is from ?0.1% to ?0.2% and that of the primary silicified quartz veins from 0.3 % ?0.5 %. This pattern demonstrates the following geochemical mineralization process, primary ore-forming siliceous fluids migrated upwards quickly along the main passages of deep-seated faults from mantle to crust and entered secondary faults where gold deposits were eventually formed as a result of permeation and replacement of the siliceous ore-forming fluids into different ore-bearing strata. This gives important evidence for the fact that ore-forming fluids of this type of gold deposits were mainly derived from upper mantle differentiation and shows good prospects for deep gold deposits and geochemical background for large and superlarge gold deposits.

The comprehensive evaluation of sustainabledevelopment in karst regions-Taking Shishanareas in Guangxi of China as an example

This paper works out a practical evaluation method of sustainable development for theundeveloped the regions and take Shishan areas of Guangxi Zhuang Autonomous Region of Chinaas an example. First of all, according to the actual conditions of the karst regions in Guangxi and thetheory of regional sustainable development this paper estabishes an index system of comprehensiveevaluation, then takes twenty-eight representative cities and counties within the karst regions ofGuangxi as research objects to evaluate the level of sustainable development. It basically illustratesthe state of regional sustainable development of the karst regions in Guangxi.

Study on Investing and Financing Development in Rural Area:A Case Study of Guangxi Zhuang Autonomous Region

"Surplus income" of farmers has been increasing steadily with the marked improvement of rural economy. However,development of rural financing market in China is rather backward. To satisfy the financing requirement of farmers and meet the demand of the construction of new countryside as well as harmonious society,development of financing market in rural area is eager to be quickened. Taking Guangxi Autonomous Region as an example,there are problems in rural investing and financing development. Firstly,farmers are in lacking of accurate understanding of investing and financing. Secondly,investors in rural area lack professional knowledge about financing generally. Thirdly,rural area has underdeveloped information degree as well as imperfect investing and financing environment. Fourthly,there are no financial products developed for rural area. Fifthly,economic development is unbalanced and relatively underdeveloped in rural area. Lastly,rural financial market has long been neglected by financial intermediaries. In order to cope with these problems,firstly,farmers should be assisted to establish accurate financial awareness and master necessary financial knowledge. Secondly,local intermediaries like securities firms and banks should be encouraged to exert impact on rural financial market. Thirdly,financial products suitable for Guangxi rural area are to be developed. Fourthly, construction and perfection of rural financial market should be quickened. Lastly,rural economic development should be quickened to enlarge capital source of financing.

Study on the Development and Protection of the Historical Figures Resources in China＇s Guangxi Border Areas -- Mrs. WA Cultural Resource Is Taken for Example

Guangxi is in the southwest border of China, and Guilin landscape and ethnic customs as the two ＂trump cards＂ have been widely utilized in the communication between Guaaagxi and the outside world. In fact, Guangxi owns many cultural resources such as humanity history, characteristic diet, and local operas to be further promoted, among which historical figures resources are especially abundant. However, the development and protection of the historical figures resources are inconsistent with the current economic and social development, and feature obviously certain hysteresis. In this paper, by taking Mrs. WA who was a heroine of the Zhuang nationality to resist foreign invasions in the Ming Dynasty, the necessary development road of the historical figures resources is explored based on analyzing the current development and protection of the historical figures resources in China＇ s Guangxi border areas, and then innovative concepts and new ideas are proposed with great efforts.

Let Education Play a More Role in Rural Revitalization—Taking Guangxi Border Ethnic Areas as an Example

The development of education and the implementation of the strategy of rural revitalization are both decisions made by the Chinese government according to the needs of the country.The article first elaborates the relationship between education and rural revitalization.Second,it takes Guangxi border ethnic areas as an example to analyze the current problems and deficiencies in the development of education.Finally,it puts forward targeted suggestions,including a hundredyear plan and education-oriented.Education is the cornerstone of national revitalization.With a view to enabling education to play a more effective role in rural revitalization.

Study on security and protection of original ecotourism resources in the mountain areas of western Guangxi

Original ecotourism resources mainly refer to natural and human original ecotourism resources, and it＇s of fragility, rarity and irreversibility. As a valuable historic heritage and hnportant tourism resources, it plays a significant role in developing tourism and economy in such areas as the underdeveloped areas, the mountain areas and mimority areas. The tourism resources in the western mountain areas of Guangxi owe ,superiorities and characteristics ＇o their original ecology, Yet, western Guangxi is an ethnic region with fragile karst eco-environment, so it is specialto exploit the tourism resources. The paper defines original eeotourism and analyses the specialties and advantages of the original ecotourism resources as well as thefrailty of the ecotourism resources of the region. The ways of thinking are put forward for safe preservation and sustainable development of the original ecotourism resources, i.e. carrying out measures for the multi-grade protection of heritage resources, setting up a ethnic eco-museum/ ethnic culture eco-park and a gene pool of ethnic cultures, etc.

Content Determination of Total Flavonoids in Tetracera asiatica from 10 Different Production Areas in Guangxi

[Objectives] To determine the content of total flavonoids in Tetracera asiatica from different production areas in Guangxi and provide a basis for improving the quality standards of crude drug. [Methods] Using 50% ethanol as extractor,NaNO_2-Al(NO_3)_3-NaOH as chromogenic system and rutin as the reference substance,the content of total flavonoids from the crude drug was determined. [Results] A method for determining the content of total flavonoids was established,the content of total flavonoids was 11.35-21.35 mg·g^(-1),and the average content was 17.64 mg·g^(-1). [Conclusions] The method had high repeatability and stability,and the method was simple,rapid and sensitive and suitable for quantitative analysis.

Study of the Seismogenic Structure of the October 12^(th),2019 MS5.2 Beiliu Earthquake,Guangxi,China

On October 12th,2019,a MS5.2 earthquake occurred in Beiliu City,Guangxi Zhuang Autonomous Region,China,with a focal depth of 10 km. The epicenter is located in the junction of Guangxi and Guangdong where the moderate-strong earthquakes are relatively active. The highest intensity of this earthquake is estimated up to Ⅵ besides the isoseismic line showed an ellipse shape with a long axis trend in the NW direction.The aftershocks are not evenly distributed. The parameters of the focal mechanism solutions are: strike 346°,dip 85°,rake 19° for the nodal planeⅠ,and strike 254°,dip 71°,rake 175° for the nodal planeⅡ. The type of the coseismic fault is strikeslip. After analyzing these results above and the active faults near the epicenter,we get that the nodal planeⅠ is interpreted as the coseismic rupture plane and the BamaBobai Fault is a seismogenic structure of MS5.2 Beiliu earthquake.

广西边境地区县域卫生资源配置状况研究

目的分析广西边境地区县域卫生资源配置现状及其公平性,为优化县域卫生资源配置提供参考。方法收集广西边境地区8个县域2015—2021年的卫生资源数据,从人口、地理两个维度评价县域卫生资源配置的公平性。结果2015—2021年,广西边境地区8个县域的卫生资源总体呈逐年增加的趋势,但大部分县域千人口床位数、执业(助理)医师数、注册护士数低于广西平均水平;按人口配置的各类卫生资源公平性的基尼系数优于按地理配置的。结论应强化政府在卫生资源配置中的宏观调控功能,进一步提高广西边境地区卫生资源配置水平;加大边境地区县域卫生人力资源投入力度,持续提升卫生人力资源供给能力;多措并举,稳定边境地区村卫生室人员队伍;优化边境地区县域卫生资源空间布局,保障卫生资源配置的公平性。

广西甘蔗主产区土壤酸化特征分析

【目的】分析广西甘蔗主产区土壤pH现状和分布特点及土壤pH与交换性盐基离子含量、土壤交换性铝含量的关系,为探明广西蔗区土壤酸化机制及土壤酸化治理提供科学依据。【方法】2023年春季在广西15个甘蔗种植面积较大的县(区、市)共采集515个地块的0~20 cm土壤样品,分别采用去离子水、0.01 mol/L CaCl_(2)溶液和1 mol/L KCl溶液测定土壤pH[分别标记为pH(H_(2)O)、pH(CaCl_(2))和pH(KCl)],同时测定交换性盐基离子、交换性酸和交换性铝含量,分析土壤pH与交换性盐基离子和盐基饱和度的关系,以及交换性铝积累对土壤p H的响应。【结果】广西甘蔗主产区土壤p H(H_(2)O)平均值为4.52,其中pH(H_(2)O)<4.5的强酸性土壤占63.9%;pH(CaCl_(2))和p H(KCl)平均值分别为4.06和3.71,与pH(H_(2)O)相比分别低0.46和0.81。土壤交换性酸平均含量为4.59 cmol/kg,且>6.0 cmol/kg的土壤占比32.8%。交换性铝是交换性酸的主要组分,在交换性酸含量>4.0 cmol/kg的土壤中,交换性铝占比超过80.0%。交换性铝含量与pH(KCl)的拟合优度最高(R^(2)=0.9005),当土壤交换性铝含量为2.0cmol/kg时,其所对应的pH(H_(2)O)、pH(CaCl_(2))和pH(KCl)的平均值分别为4.67、4.07和3.66。土壤交换性钙、交换性镁和交换性钾的平均含量分别为4.67、0.42和0.49cmol/kg,土壤交换性钙含量<1.5 cmol/kg的土壤占比31.1%,交换性镁含量<0.25 cmol/kg的土壤占比31.7%,交换性钾含量以介于0.2~0.6 cmol/kg的土壤占多数,约为46.8%。土壤盐基饱和度平均为49.5%,且有15.3%的土壤盐基饱和度在20%以下。盐基饱和度、交换性钙和交换性镁含量与土壤pH(H_(2)O)、pH(CaCl_(2))和pH(KCl)均呈极显著正相关(P<0.01)。【结论】广西甘蔗主产区出现严重的土壤酸化现象,pH≤4.5的土壤占大多数。钙镁缺乏、盐基饱和度偏低和铝毒危害风险较高已成为广西甘蔗主产区土壤酸化的主要特征。

欠发达地区农文旅融合效率测度与提升路径——基于广西14地市的实证分析

随着市场竞争加剧和消费需求的升级,农文旅融合发展已成为推动产业结构优化和区域经济发展的重要途径。基于产业融合和组态理论,利用DEA交叉效率模型对广西14个欠发达地市的农旅、文旅以及农文融合效率进行测算,并运用fsQCA方法探索两两融合的高效发展路径。结果表明:①广西农文旅融合效率总体呈现上升趋势,其中农文融合效率高于农旅和文旅融合效率;②各地市农文旅融合效率普遍偏低,高效率地区较少,发展存在不均衡性;③经济发展、交通建设、政府支持、对外开放和技术创新等5个因素构成实现高融合效率的7种路径,且技术创新是提高农文旅融合效率的核心因素。因此,欠发达地区应该明确发展路径,加强政府主导,强化科技创,坚持农业为本,通过多产融合高质量助力乡村振兴。

广西沿边壮族色彩文化的数智化建构研究

本文在全球化和数字化背景下,探讨了广西沿边壮族色彩文化的独特性、重要性及其传承发展的挑战与机遇。采用文献研究、田野调查、人证考察以及技术实验等方法,旨在通过数智化手段探索壮族色彩文化的创新传承路径。研究分析了数智化对壮族色彩文化保护、传承、推广及文化创意产业发展的价值,揭示了数智化技术在民族文化传承中的潜力。展示了数智化手段在促进民族文化传承与发展中的有效性,为学术界提供了新视角,同时也为实践领域中的沿边壮族色彩文化保护与创新提供了有力支持。

广西典型沙生红树林总初级生产力变化特征及其对气象因子的响应

红树林是海岸带生态系统中单位面积总初级生产力最高的植被生态系统。广西红树林总面积位居全国第二位,研究红树林GPP变化特征,深入探究其对气象因子的敏感性,以期为全面了解红树林碳循环动态和制定相应气候变化适应策略提供科学依据,为红树林的保育管理和生态修复提供参考。目前,尚未见有基于涡度相关技术开展广西红树林GPP研究的相关成果。以广西北海市沙生红树林为研究对象,研究区同时也是红树林生态修复区,采用涡度相关技术结合冠层实景观测技术,系统分析红树林GPP的月平均日变化特征、季平均日变化特征、月累积变化特征及年累积变化特征,并利用单因子相关分析和多因子通径分析,研究光合有效辐射、气温、地表5 cm温度、饱和水汽压差和降雨量在日、月尺度与GPP的响应模型。结果表明,GPP的平均日变化曲线在月和季尺度上呈倒“U”型分布,月累积年内呈现“双峰一谷”的变化趋势,春季和秋季为波峰,夏季为波谷;红树林冠层植被指数的分析表明,夏季波谷是由于虫害爆发导致GPP下降。2019-2022年GPP年累积分别为1.28×10^(3)、1.29×10^(3)、1.36×10^(3)、1.38×10^(3)g∙m^(-2)∙a^(-1)(以C计,下同),年累积量均值为1.33×10^(3)g∙m^(-2)∙a^(-1),GPP呈缓慢增加的趋势,但GPP显著小于东南沿海观测站点,这与研究区的土壤类型、群落结构以及观测站区域外部扰动有关。对红树林GPP产生直接影响最大的气象因子为光合有效辐射和气温,产生间接影响最大的因子为地表5 cm温度。综上,北海沙生红树林GPP与东南沿海相比较弱,随着生态修复工作的实施,GPP缓慢递增,但病虫害对红树林GPP影响较大,应及时开展病虫害防治工作,有利于红树林碳汇功能的提升。

广西中南部语法化区域的两个共享特征

广西中南部汉、壮语共享两个特征,即量词重叠(CL+CL)表任指、“对”有存在动词、处所/时间介词的功能,模式语都是壮语,汉语复制了其语法功能。前一共享特征在如下结构的演变中获得,即:V_(1)+CL+哪,CL+那+V_(2)>V_(1)+CL,CL+V_(2)>V_(1)+CL+CL+V_(2),触发演变的语境是五言壮语歌谣。后一共享特征的来源是:壮族人意识到壮语的“V+te:■^(1)”与汉语官话的“V+对”是相对应的,推测出壮语的te:■^(1)就是官话的“对”,他们将壮语“te:■^(1)+N”结构类推为壮式官话的“对+N”。随着壮式官话“对+N”在宜州官话中的扩展,导致“对”获得存在动词、处所/时间介词的功能。

广西横州市岩溶与非岩溶区耕层土壤Zn通量特征

以广西横州市岩溶区和非岩溶区为研究区,针对耕层土壤Zn的输送途径和年输送通量密度进行对比研究.结果表明,受成土母质影响,岩溶区表层土壤Zn含量明显高于非岩溶区,岩溶区和非岩溶区土壤Zn的输入量受人类活动影响较大,主要输入途径均为大气沉降,年输入通量密度均值分别为494.15和484.99g/(hm^(2)·a);主要输出途径为农作物收割,年输出通量密度分别为490.63和580.12g/(hm^(2)·a),受铁锰结核和灌溉水影响,非岩溶区年输出通量密度略高;研究区年净输入通量整体表现为Zn累积状态.

桂西北岩溶地质高背景和矿业活动叠加区土壤剖面镉分布特征及生物有效性

桂西北岩溶地质高背景与矿业活动叠加,导致土壤污染风险增大,对粮食和生态安全构成了潜在威胁。以广西河池地区典型岩溶地质高背景与矿业活动叠加区作为研究区域,采集了3条水稻田土壤剖面(0~100 cm)样品,分析镉(Cd)的空间分布特征和生物有效性,结合富集因子法、风险评价指数等对土壤剖面Cd污染状况与生态风险进行了评估。结果表明:3条剖面土壤Cd在表层(0~20 cm)均显著富集,表明在土壤表层有明显人为来源的重金属Cd积累。根据国家标准《土壤环境质量:农用地土壤污染风险管控标准(试行)》(GB 15618—2018),距离矿区较远的两条剖面土壤Cd含量有个别样品超过农用地土壤污染风险筛选值,而靠近矿区的剖面则有90%的土壤样品超过农用地土壤风险管控值。研究区土壤剖面Cd含量主要受控于地质背景、农业耕作和矿业活动等多因素相互叠加,不同剖面含量差异主要取决于距离矿区的远近,同一剖面则与土壤pH值和有机质含量有关。土壤剖面Cd主要以铁锰结合态、离子交换态和残渣态存在,其生物有效性主要受控于土壤Cd总含量、pH值、有机质含量以及铁锰氧化物的固定作用,表现出远离矿区的土壤剖面以及土壤表层的生物有效性相对较高的特点。