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.

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。

基于边疆红色文化的城乡导视系统数智化设计研究——以广西崇左景观导视设计为例

城乡导视系统作为公众感知空间的重要媒介,其与文化元素、旅游产业的融合,对传承红色文化、提升城乡形象、促进边疆地区发展具有重要意义。本文运用系统理论,从多个维度出发,着眼广西崇左城乡导视系统定位与特点,作者通过分析崇左地区景观导视设计案例,梳理导视系统数智化设计思路以及创新数智化设计路径,全方位提升城市与乡村导视系统的实用属性。

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。

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。

黔桂地区泥盆系层序地层格架及相对海平面变化

志留纪末期的加里东运动 ,使黔桂地区的古地理格局发生了重大变化 ,早古生代的滇黔桂古陆演变为晚古生代的滇黔桂海。泥盆纪初期 ,海水由南而北逐渐海侵超覆 ,在泥盆系的底部形成一套海侵碎屑岩系地层 ;早泥盆世晚期的大规模海侵事件造成了明显的相分异 ,在习称的滇黔桂盆地中发育了若干孤立碳酸盐台地 ,这种“台—盆—丘—槽”的格局一直延续到晚泥盆世早期 ;而泥盆纪末期的紫云运动所造成的地壳抬升 ,又使晚泥盆世地层产生海退尖灭。因此 ,该地区的泥盆系构成一个二级构造层序 ,其中包含 13个三级沉积层序。在前人大量生物地层学研究的基础上 ,追索和对比不同沉积背景中的三级沉积层序的相序组构特征以及由其所代表的相对海平面变化 ,即可建立黔桂地区泥盆系的层序地层格架。层序地层格架较为充分地表现出三级沉积层序的两大特征——空间上相序的有序性和时间上环境变化的同步性 ,同时也明显地显示出地层记录中的两种相变面和两种穿时性。

滇黔交界地区峨眉山玄武岩铜矿化蚀变特征

滇黔交界地区峨眉山玄武岩铜矿化具层控特征 ,主要发育于上二叠统峨眉山玄武岩组第四岩性段下部。矿化主岩为玄武岩流顶部的淬碎玄武质角砾岩和玄武岩流之间的含炭沉积岩 ;矿石矿物主要为自然铜及其表生氧化产物黑铜矿、赤铜矿、孔雀石等 ;脉石矿物主要有沥青、炭质物、石英、沸石、方解石、绿帘石等 ,此外还有少量绿泥石、钠长石、铁阳起石、榍石、辉铜矿、硅孔雀石、铜蓝、褐铁矿等。以玄武岩为主岩的铜矿石典型矿物组合为自然铜 +沥青 +石英及不含沥青等有机质的自然铜 +石英 +绿帘石 ,以含炭沉积岩为主岩的铜矿石典型矿物组合为自然铜 +炭质物 +沸石 +石英 (+辉铜矿 ) ;原生铜矿化有 2个期次 :早期铜矿化发生于有机质流体贯入之前 ,晚期铜矿化发生于有机质流体贯入之后。该类铜矿化的同生火山热液特征不明显 ,以后生热液矿化为主。淬碎玄武质角砾岩不仅是有机流体的良好储层 ,也为成矿流体提供了就位空间 ,是铜矿化层控特征的主要控制因素。有机流体及含碳沉积岩中碳质为成矿物质以自然铜形式沉淀提供了还原条件。

黔桂地区石炭纪层序地层格架及古地理演化

黔桂地区的石炭系可划分为下统和上统,其中下统又划分为岩关阶、大塘阶和德坞阶,上统划分为罗苏阶、滑石板阶、达拉阶和逍遥阶。多年来一直作为石炭系的马平组则成为一个跨系的岩石地层单位,因此石炭系最顶部的地层与下二叠统一起构成1个三级层序。从石炭系到下二叠统构成1个二级层序,其底面为紫云运动主幕产生的不整合面,顶界面为黔桂运动产生的不整合面,包含6个三级沉积层序,分别简称为SQ14,SQ15,SQ16,SQ17,SQ18,SQ19。研究区范围内从连陆台地到孤立台地乃至台沟背景,沉积特征明显不同,连陆台地上发育煤系地层并且发育较多的白云岩地层,孤立台地上则以大套碳酸盐岩地层为特征,台沟背景中以暗色细粒沉积为主。所以,尽管三级层序的相序特征在空间上变化较大,但它们所代表的相对海平面变化过程基本上是同步的。在前人大量的古生物学研究成果的基础上,系列层序地层格架栅状图以及相应的古地理图较为清楚地反映了研究区石炭纪至二叠纪船山世复杂而有序的时间相变与空间相变。

滇桂交界处古特提斯的洋岛和岛弧火山岩

基于详细的野外调查和系统的岩石化学工作 ,探讨了滇桂交界处二叠纪—中三叠世火山岩的大地构造背景。洋岛玄武岩以弄槐枕状熔岩为代表性火山岩 ,原为古特提斯洋盆中的夏威夷型洋岛 ,现保存在印支期前陆褶皱冲断带的一个外来岩席中。采自鱼塘—那塘、羊加山和甫听河的安山岩—玄武岩指示洋盆从二叠纪至中三叠世一直处于消减中 ,反映了与滇西南古特提斯演化不同的地球动力学背景。以上认识为中、越交界地区构造上属古特提斯造山带提供了新证据 ,为重塑该地的古特提斯演化提供了重要资料。