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.

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.

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.

Geological characterization and exploration potential of shale gas in the Carboniferous Jiusi Formation,northern Guizhou and Yunnan provinces,SW China

Dark mudstones and shales of the Carboniferous Jiusi Formation are widely developed in northern Guizhou and Yunnan provinces, SW China. However, the distribution, reservoir characterization, and exploration potential of organic-rich shales in this area are yet to be quantified, thus limiting the prospect of shale gas in this area. This study investigates the basic geological conditions of Jiusi shale gas, using core data, well-logs, and some other test data, obtaining the following results. The organic-rich shales are mainly composed of deltaic-to-shallow-shelf deposits, with thickness ranging from 0 to 450 m, and above 350 m around the subsidence center. The organic matter is mainly type Ⅱ kerogen with TOC content of mostly 1%–2%, indicating a moderate maturity. The argillaceous shale reservoirs are indicative of strong heterogeneity, high clay minerals content, low porosity, low permeability, high specific surface area, and relatively developed secondary porosity. The gas-log anomaly intervals obtained from the survey wells have a cumulative thickness that is apparently greater than 200 m, and a few shale intervals showing high desorbed and adsorbed gas contents. Due to complex structures in the study area, conditions responsible for shale gas occurrence and trapping are generally moderate. However, areas having wide and gentle folds with moderate depth of burial reveals relatively favorable conditions of hydrocarbon traps. In contrast with typical marine-continental transitional shales, the Jiusi shale have better geological conditions for shale gas preservation. The analysis of the geological framework and hydrocarbon potential of Carboniferous Jiusi Formation provide more insight for the exploration of Carboniferous shale gas in southern China.

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 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.

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.

滇桂黔石漠化片区植被净初级生产力时空分异研究

植被净初级生产力(net primary production,NPP)作为陆地生态系统碳循环的关键参数,其提升对于改善植被覆盖度、促进生态系统碳循环、推动区域可持续发展等具有重要意义.文章以重点生态功能区、特殊生态脆弱区——滇桂黔石漠化片区为研究区域,运用空间自相关和地理探测器等方法,分析NPP时空分异特征及其驱动因子,结果表明:①滇桂黔石漠化片区石漠化治理取得初步成效,但植被改善仍有较大提升空间.2000—2020年片区NPP均值由2000年的878.99 gC/(m^(2)·a)缓慢波动上升至2020年的908.60 gC/(m^(2)·a),年均仅提升1.486 gC/(m^(2)·a);②滇桂黔石漠化片区NPP均值空间格局相对稳定,但内部差异明显.总体维持西南较高、南部次之、北部较低的空间分异特征,整体依次对应云南片区、广西片区以及贵州片区;③滇桂黔石漠化片区NPP在空间分布上具有显著的正相关性,且相关性呈强化趋势.局域空间格局以高−高集聚型(HH)和低−低集聚型(LL)为主,高值区趋于集聚,低值区趋于相邻;④滇桂黔石漠化片区NPP时空分异格局是自然地理要素和社会经济要素共同作用的结果,其中降雨、气温和人口密度是主要影响因子.

湘黔交界区苗族传统民居平面类型及其影响因子研究

文章以湘黔交界区内苗族传统民居为研究对象,通过系统性调查和实地测绘,以堂屋空间形态及堂室组合关系为依据进行平面类型划分,揭示苗族传统民居对地域自然与人文环境的适应性表达。进一步分析了苗族传统民居的接地方式、祭祀空间、火塘间等造成民居平面类型差异的因子特征及作用机制,以期维持民族建筑文化生态的多样性,为乡村新民居的建设集聚能量。

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。

黔湘桂边区旅游促进各民族交往交流交融活态实践与推进路径

文章阐述黔湘桂边区在空间、文化、经济、社会、心理五个实践维度推动旅游产业发展促进各民族全方位互嵌,且呈现出交往交流交融的频率更快、波及范围更广、变化更多、主动性和互鉴性更强、关系更复杂、内涵更丰富、发展趋势更好、国家认同更突出等特征。通过探析该区域存在的现实问题,从宏观、中观、微观层面提出推进路径,为民族地区中国式现代化提供鲜活的范本。

湘黔桂毗邻地区南华纪岩相古地理特征及地质意义

为了寻找连续完整且有研究价值的南华系剖面、推进南华系建系工作。本文依据对湘黔桂交界地区南华系主要剖面观察研究所获资料,以沉积岩相类型分析、分布特点为线索,划分出了12种沉积岩相类型,在此基础上反演南华纪各主要阶段古地理环境。得出:南华纪湘黔桂交界地区北西侧为古陆、南东侧为南华裂谷盆地,南华纪早晚两个冰期仅在古陆与盆地过渡的浅海地带,也就是现今的湘黔桂交界地区存在连续完整的沉积,连续完整的具研究价值的南华系剖面应在该区域寻找这一结论。

边疆民族地区女性就业群体的劳动力市场表现:桂西地区实证研究

本文系桂西劳动经济学系列研究成果之一。研究依托自有数据库,运用“劳动-闲暇”模型、“推-拉”模型等经典理论分析了桂西地区女性就业者在劳动力市场的一般表现,运用回归分析解释了该群体劳动回报的主要影响因素,旨在通过研究,为管理部门制定政策推动女性就业提供实证依据,同时,通过研究亦能反映桂西地区女性就业群体的特殊性事实。

边疆民族地区高校民族团结教育优化研究——以广西壮族自治区为例

优化边疆民族地区高校民族团结教育是落实“立德树人”根本任务,助推边疆民族地区稳定发展,筑牢国家意识形态安全的重要方式,具有十分重要的意义。广西壮族自治区属于边疆民族地区,该地的高校民族团结教育虽取得了一定的成效,但仍存在一些不足:部分高校民族团结教育体制机制有待加强、师资力量有待加强,教学方式具有单一性。优化边疆民族地区高校民族团结教育必须以加强高校民族团结教育体制机制建设为保障,以加强高校师资队伍建设为抓手,以高校民族团结教育课程改革创新为关键,增强边疆民族地区高校民族团结教育的功能性,进而实现边疆民族地区高校民族团结教育的创新性发展。

边境地区疫情防控与铸牢中华民族共同体意识研究——基于对2022年广西百色“2·4”疫情事件的考察

无论是疫情防控,还是铸牢中华民族共同体意识,边境地区都是重要一环。2022年2月广西百色疫情突发事件的解决充分展现了边境地区疫情防控与铸牢中华民族共同体意识的双向互动,其中,中华民族共同体意识是边境地区顺利开展疫情防控的思想保障,做好边境地区疫情防控是有效铸牢中华民族共同体意识的具体实践,边境地区的疫情防控与铸牢中华民族共同体意识工作相辅相成,统一于中国式现代化的发展进程之中。但同时也暴露出制约边境地区疫情防控及铸牢中华民族共同体意识工作的不利因素,具体包括特殊的地理位置与周边环境、相对滞后的经济社会发展水平、屡见不鲜的网络谣言与污名化现象等。目前中国防疫进入新阶段,为实现边境地区疫情防控与铸牢中华民族共同体意识的共同推进,今后仍需持续深入推进新时代兴边富民行动,加快边境地区的现代化进程;促进边境地区与其他地区民众的交往交流交融,共同构筑中华民族共有精神家园;掌握疫情防控舆论话语权,从共同体建设高度讲好边境地区的防疫故事。

滇桂黔石漠化片区生态系统碳储量时空演变及其驱动因子

[目的]探究特殊生态脆弱区——滇桂黔石漠化片区的生态系统碳储量时空演变规律及其驱动因子,为科学评估其生态治理效果、优化土地利用格局、提高生态系统碳储量、提升生态系统碳汇能力等提供理论参考。[方法]综合运用土地利用转移矩阵、InVEST模型和地理探测器等方法,分析滇桂黔石漠化片区1990—2018年土地利用变化特征、生态系统碳储量时空演变规律及空间分异驱动因子。[结果]滇桂黔石漠化片区城市建设蓬勃发展,石漠化治理效果良好。研究期内,建设用地和水域面积分别增加116.38%和76.40%,以石漠化裸岩石质地为主的未利用地则减少47.45%并主要转化为草地和林地;滇桂黔石漠化片区生态系统碳储量呈波动下降趋势,2018年降至30.61亿t,较1990年减少了0.52%。建设用地扩张对耕地和林地的侵占是碳储量减少的主要原因;滇桂黔石漠化片区生态系统碳储量空间分布差异明显,始终维持西南较高、南部次之、北部较低的空间分异特征,整体依次对应云南片区、广西片区以及贵州片区;滇桂黔石漠化片区生态系统碳储量空间分布差异受自然地理要素和社会经济要素共同作用,但人类活动影响最为显著。“距离县中心”始终是影响力最强的单因子,且所有具备较强影响力的交互因子均包含“距离县中心”因子。[结论]滇桂黔石漠化片区的生态系统碳储量呈波动下降趋势,受自然地理、社会经济多重因素影响,其空间分布呈西南较高、南部次之、北部较低的特征。

基于社会网络分析的广西边境突发公共卫生事件防控问题探讨

目的对广西边境地区突发公共卫生事件防控发展中存在的问题进行梳理和探讨,为广西边境地区突发公共卫生事件防控建设提供借鉴。方法采用文献分析法并结合社会网络分析法对文献进行分析,运用TOPSIS对基于社会网络分析法计算得出广西边境突发公共卫生事件防控建设问题的点度中心度、中间中心度和接近中心度3个维度进行综合排名。结果广西边境地区突发公共卫生事件防控建设发展中存在边境地区卫生人力资源不足、突发公共卫生监测预警能力有限及应急资源储备能力不足等问题;通过TOPSIS综合评价,排名前三位是边境地区卫生人力资源不足(Ci=0.30)、突发公共卫生监测预警能力有限(Ci=0.11)及应急资源储备能力不足(Ci=0.09)。结论加强边境卫生应急人才队伍建设,提升突发公共卫生事件预警监测能力,提高应急资源储备能力以及加大财政投入力度是广西边境突发公共卫生事件防控建设的必要举措。

滇桂黔石漠化片区土地生态系统服务价值时空演变研究

土地生态系统服务价值评价对于优化土地利用格局、改善地表覆被、实现区域可持续发展,具有重要的指导意义。以特殊生态脆弱区——滇桂黔石漠化片区为研究区域,综合运用土地利用转移矩阵、价值当量法和地理探测器等方法,探究片区1990—2018年土地生态系统服务价值的时空演变特征及其驱动因子。结果表明:研究期内,滇桂黔石漠化片区城市建设成效显著,石漠化治理效果良好。建设用地和水域面积分别增加116.38%和76.40%,以石漠化裸岩石质地为主的未利用地则减少47.45%并主要转化为草地和林地。但耕地和林地面积的减少态势应引起警惕;滇桂黔石漠化片区生态系统服务价值呈逐年增加态势,生态系统服务价值由1990年的10423.82亿元逐年提高至2018年的10631.62亿元,但增长幅度较小且内部差异明显,总体维持西南较高、南部次之、北部较低的空间分异特征,生态系统功能改善仍任重道远;滇桂黔石漠化片区生态系统服务价值的空间分布差异受自然地理要素和社会经济要素共同作用,其中人类活动程度影响深刻。距离县中心、人口密度和年均气温始终是解释力排前三的单因子,且所有具备较强解释力的交互因子均包含距离县中心。

破译结核中的沉积环境和同沉积构造活动信息——以黔湘边界地区黑色岩系为例

黑色岩系赋存油气、煤、页岩气等能源资源和铁、锰、磷、钡等多种固体资源,沉积成藏和沉积成矿条件的恢复是资源预测的基石,古沉积环境和同沉积构造的恢复因而受到额外重视。在黔湘边界地区的黑色岩系中有大量结核,而结核对原始记录有封存特性,因此,在对野外露头剖面观察和室内显微分析的基础上,通过沉积作用—构造作用的一体化分析,发现不同层位的结核在矿物成分和结构类型上差别很大:(1)上震旦统—寒武系纽芬兰统留茶坡组(Z-C l)的结核是重晶石、钙质、磷质和硅质等多成分的集合体,砾屑或砂屑结构;两层结核的胶结温度不同,直接覆盖重晶石矿的结核层温度较高;(2)寒武系第二统杷榔组(-C_2p)的结核以黄铁矿为主要成分,发育三期生长构造:核心层呈草莓状结构,外面两层呈肾状结构;(3)寒武系第二统乌训组(-C_2w)结核的矿物成分为钙质和黄铁矿,并以钙质为主,黄铁矿呈星点状散布其中,有四期生长构造,第一和第三期黄铁矿含量较高。从不同层位的结核中分别破译出不同的古沉积环境条件和同沉积构造的活动信息:(1)留茶坡组含重晶石结核属低温热液成因,还原环境局限在断裂带附近;(2)杷榔组黄铁矿结核形成于氧化还原界面附近,环境具备高浓度活性铁的介质条件;(3)乌训组钙质—黄铁矿结核形成于低浓度铁的周期性还原环境,推测为基底的幕式陷落引发频繁的相对海平面变化,从而导致水介质氧化还原性的频繁变化。因此,结核研究有助于重建黑色岩系的介质条件,对资源预测有重要意义。

广西边境地区土地利用“三生”功能协调关系及分区优化

为探究边境地区土地利用多功能之间的交互关系,基于生态位宽度、耦合协调度和权衡强度模型分析广西边境地区2000—2018年土地利用“三生”功能的时空演变及协调/权衡关系特征,并分区提出优化建议。结果表明:(1)广西边境地区“三生”功能时空分异特征显著,生产功能生态位宽度以扩张状态为主,呈“东南高、西北低”的梯度变化格局;生活功能生态位呈萎缩后扩大趋势;生态功能生态位宽度呈现萎缩态势,呈“双高多平”空间布局。(2)土地利用功能耦合协调类型区分为濒临失调型及勉强协调区,总体由濒临失调型向勉强协调型演变,勉强协调区主要为经济相对繁荣区,濒临失调型集聚在西部生态环境脆弱山区;两两功能权衡强度较低为防城区,权衡强度较高为那坡县、龙州县。(3)全区可划分为低协调区、生产—生活功能优势区、生产—生态功能优势区、生态—生活功能优势区、生产功能优势区、生态功能优势区、生活功能优势区并提出针对性措施。广西边境地区土地利用“三生”功能之间相互作用关系整体往协调态势发展,后续发展应注重以生态优先为导向。