Geological and geochemical characteristics of the Baogudi Carlintype gold district(Southwest Guizhou,China) and their geological implications     

Songtao Li  Yong Xia  Jianzhong Liu  Zhuojun Xie  Qinping Tan  Yimeng Zhao  Minghua Meng  Lijin Tan  Rong Nie  Zepeng Wang  Guanghong Zhou  Haiyan Guo 《Acta Geochimica》2019,(4):587-609

The newly discovered Baogudi gold district is located in the southwestern Guizhou Province,China,where there are numerous Carlin-type gold deposits.To better understand the geological and geochemical characteristics of the Baogudi gold district,we carried out petrographic observations,elemental analyses,and fluid inclusion and isotopic composition studies.We also compared the results with those of typical Carlin-type gold deposits in southwestern Guizhou.Three mineralization stages,namely,the sedimentation diagenesis,hydrothermal(main-ore and late-ore substages),and supergene stages,were identified based on field and petrographic observations.The main-ore and late-ore stages correspond to Au and Sb mineralization,respectively,which are similar to typical Carlin-type mineralization.The mass transfer associated with alteration and mineralization shows that a significant amount of Au,As,Sb,Hg,Tl,Mo,and S were added to mineralized rocks during the main-ore stage.Remarkably,arsenic,Sb,and S were added to the mineralized rocks during the late-ore stage.Element migration indicates that the sulfidation process was responsible for ore formation.Four types of fluid inclusions were identified in ore-related quartz and fluorite.The main-ore stage fluids are characterized by an H2O–NaCl–CO2–CH4±N2system,with medium to low temperatures(180–260℃)and low salinity(0–9.08%NaCl equivalent).The late-ore stage fluids featured H2O–NaCl±CO2±CH4,with low temperature(120–200℃)and low salinity(0–7.48%Na Cl equivalent).The temperature,salinity,and CO2and CH4concentrations of ore-forming fluids decreased from the main-ore stage to the late-ore stage.The calculated δ^13C,d D,and δ^18O values of the ore-forming fluids range from-14.3 to-7.0%,-76 to-55.7%,and 4.5–15.0%,respectively.Late-ore-stage stibnite had δ^34S values ranging from-0.6 to 1.9%.These stable isotopic compositions indicate that the ore-forming fluids originated mainly from deep magmatic hydrothermal fluids,with minor contributions from strata.Collectively,the Baogudi metallogenic district has geological and geochemical characteristics that are typical of Carlin-type gold deposits in southwest Guizhou.It is likely that the Baogudi gold district,together with other Carlin-type gold deposits in southwestern Guizhou,was formed in response to a single widespread metallogenic event.  相似文献   

Volume and Surface Distribution Heterogeneity of Nano-pore in Coal Samples by CO2 and N2 Adsorption Experiments     

ZHANG Junjian  WEI Chongtao  LUO Jinhui  LU Guanwen  QUAN Fangkai  ZHENG Kai  PENG Yujie 《《地质学报》英文版》2020,94(5):1662-1675

In this paper, the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal theory. The following results were achieved. 1) According to the results of volume and surface fractal dimension, meso-pores can be classified into Mep-1, Mep-2, and Mep-3, respectively. Micro-pore can be classified into Mip-1, Mip-2, and Mip-3, respectively. 2) Pore types play an important role in affecting the heterogeneity of meso-pores. The volume heterogeneity (VHY) of Mep-1 is simpler than that of Mep-2 and Mep-3 in type A samples. However, the VHY of Mep-1 becomes gradually larger than that of Mep-2 and Mep-3 from type A to type B and C. The VHY of open pore in the same diameter is higher than that of semi-open or closed pore. Meanwhile, the surface heterogeneity (SHY) of types A and B samples is significantly larger than that of type C, the SHY of semi-open or closed pores is more complicated than that of open pores. 3) Coal rank mainly affects the heterogeneity of micro-pores. The heterogeneity of type A is always smaller than that of type B and C. The VHY of Mip-1 is more complicated than that of Mip-2 and Mip-3 in the same samples, and the sensitivity of the VHY of Mip-1 and Mip-2 to the degree of coal rank is smaller than that of Mip-3. Meanwhile, the SHY of Mip-1 and Mip-2 is simpler than that of Mip-3 in the same sample, the SHY of micro-pores remains stable as the pore size decreases, and the affect of coalification level on SHY decreases with the decrease in pore diameter. Full-scale fractal characterization has enabled quantitative characterization of adsorption pore properties and provided useful information with regards to the similarity of pore features in different coal reservoirs.  相似文献   

黔中地区浅覆盖型岩溶塌陷成因机制与防治对策--以紫云县白云小学为例     

杨元丽  孟凡涛  李明惠 《中国岩溶》2020,39(1):80-87

黔中地区处于贵州省第二阶梯,平均海拔800~1600 m。具有可溶岩分布面积广、岩溶极其发育、第四系土层覆盖薄、地下水埋深浅、地下水动力条件强等特点。岩溶地面塌陷是该区主要地质灾害之一。为了查明贵州省紫云县白云小学岩溶塌陷的成因及发育机制,在塌陷区开展了水文地质调查、地球物理勘探、水文地质工程地质钻探、岩土样测试等多项工作。综合研究表明,白云小学岩溶塌陷是特殊的"水-土-岩"不良因素共同作用的产物。根据塌陷区的岩土组构特征,建议在黔中岩溶地区进行工程选址前,采用"监测预防+控水+工程治理"综合防治措施。  相似文献   

黔南独山砂岩地貌特征及形成演化          下载免费PDF全文

刘凌云  唐佐其  田文明  唐婷婷  龙建喜 《贵州地质》2020,37(1):74-79

黔南独山北东—东部一带广泛出露下泥盆统砂岩,形成了类型丰富的砂岩地貌景观。本文以野外调查为基础,对地貌景观类型及其成因演化机理作了主要分析,认为该区地貌为省内可与张家界媲美的砂岩地貌分布区,具有砂体时代老、演化属幼年期的特征。  相似文献   

贵州梵净山地区主要地质遗迹资源及其开发保护建议          下载免费PDF全文

马义波  谯文浪  陈武  刘凌云  唐佐其 《贵州地质》2020,37(1):80-87

梵净山地区新元代地层发育良好,地质构造复杂,形成了丰富的地质遗迹资源,具有非常重要的地质意义和旅游价值。本文以1∶5万梵净山等四幅区调为基础,通过资料收集、实地调查等方法对研究区地质遗迹资源进行了系统分类,划分了10个大类、15个亚类,其主要地质遗迹资源有沉积地质遗迹资源等六大类。同时,采用综合评价方法对区内地质遗迹资源进行了评价,发现研究区主要以国家级和省级地质遗迹资源为主,还有少数世界级地质遗迹资源,总体质量较好。本文对研究区六大类主要地质遗迹资源的科学内涵进行了介绍,并从地质遗迹资源保护、研究和开发三个方面提出了合理的建议。  相似文献   

贵州威宁鱼坝稀土含矿岩系的锆石U-Pb年龄          下载免费PDF全文

王常微  张克信  何卫红  杨忠琴  杨廷禄  胡从亮  张扬  邓毅  于志松 《贵州地质》2020,37(1):14-23

黔西北地区晚二叠世稀土矿产于峨眉山玄武岩与上伏宣威组假整合面附近,在威宁地区稀土矿分为上、下两层,下含矿层为浅灰白色高岭石粘土岩,上含矿层为浅灰色高岭石粘土岩与铝质高岭石粘土岩,含矿岩系厚度在区域上变化较大,在威宁鱼坝剖面含矿岩系完整且厚度较大。在含矿岩系底部凝灰质粘土岩中取样测得锆石U-Pb平均年龄为254. 11 Ma±0. 98 Ma,含矿岩系顶部熔结凝灰岩锆石U-Pb年龄为252. 0 Ma±0. 82 Ma(谐和年龄)和251. 9 Ma±1. 86 Ma(平均年龄)。证实黔西北晚二叠世稀土含矿岩系下矿层产于峨眉山玄武岩第三段上部、上矿层产于宣威组下段,整个稀土含矿岩系形成时间约为2 Ma。  相似文献   

贵州锦屏地区金矿地球化学特征与成矿物源分析          下载免费PDF全文

牟军  覃永军  王安华  罗香建  强希润 《贵州地质》2020,37(1):31-39

对贵州锦屏石英脉型金矿赋矿地层岩石地球化学分析结果表明,该区金矿赋矿层位新元古代下江群再瓦组—隆里组地层中Au元素含量一般低于上地壳背景值,并随地层由老到新其含量大致具有逐渐减少的特点,但Au及其共伴生元素的富集对地层、岩性并无明显的选择性。金矿石中黄铁矿及毒砂硫同位素分析结果显示:δ~(34)S介于-0. 79‰～5. 93‰之间,大部分与上地幔基性—超基性岩δ~(34)S值相近,少量与中酸性岩相近,表明成矿物质主要来源于上地幔。  相似文献   

贵州1∶5万耕地质量地球化学调查评价方法技术          下载免费PDF全文

任明强  冷洋洋  周尔春  蔡大为  李龙波  张美雪 《贵州地质》2020,37(3):227-232

利用矩阵的分块及矩阵的奇异值分解,探讨了矩阵及其扰动后的矩阵阶数不同时特征值的扰动界,得到了Hermite矩阵特征值的Wielandt-Hoffman-残差型扰动界。进一步将所得结果推广到可对称化矩阵,给出了可对称化矩阵特征值新的Wielandt-Hoffman-残差型扰动界,且所得结论推广了原有结果。  相似文献   

贵州山区降水集中度和降水集中期的时空变化特征   总被引：2，自引：0，他引：2  

张波  谷晓平  古书鸿 《水文》2017,37(6):63-67

利用1961~2015年贵州省81个气象观测站的逐日降雨资料,计算了降水集中度(PCD)和集中期(PCP),并采用线性趋势、空间分析、M-K突变检验和R/S分析等方法 ,对贵州山区复杂地形下的降水集中度和降水集中期进行了分析。结果表明:贵州1961~2015年PCD波动幅度介于0.30~0.59之间,空间分布上由东向西逐渐增加的趋势,PCP的波动范围在16.5~21.0旬之间,空间呈现出由东南向西北逐渐增加的趋势;PCD与降水量的相关性高于PCP与降水量的相关性,表明贵州地区的降水量越多,降水越趋于集中;R/S分析表明贵州地区PCD可能隐含着周期规律,PCP会保持提前的趋势。  相似文献   

黔中开阳地区南华系澄江组古环境演化及意义     

吴文明  徐世林  杨瑞东  王泽鹏  刘建中  刘松  王大福  吴小红  万大学  潘启权  张丞 《地质论评》2020,66(2):276-288

为查明贵州开阳极乐南华系澄江组的沉积环境演化过程、物质来源。对开阳磷矿极乐矿段南华系澄江组剖面进行详细的野外考察,并开展沉积学、矿物学、主量、微量和稀土元素地球化学特征研究。结果表明:澄江组岩样SiO_2含量为65.56%～78.45%,结合岩矿鉴定结果认为岩性主要为石英岩屑砂岩;其Al_2O_3/SiO_2值和TiO_2含量自下而上呈逐渐减小趋势;其Sr/Cu值平均为13.15,显示为干旱炎热气候;其沉积环境参数主要指标Th/U2,V/Cr2,δCe1,δEu1,均显示澄江组水体为氧化环境。∑REE为152.28～266.23μg/g,呈轻稀土富集,重稀土亏损,其配分模式与青白口系清水江组一致。综合认为:澄江组整套岩层水平层理发育,表明沉积区水体相对安静,总体为湖相沉积。其早至中—晚期水体深度由深变浅,至末期为浅滩环境。沉积物质可能来源于青白口系清水江组。沉积期间的古气候环境为干旱炎热,水体盐度自早到晚期持续上升,总体为氧化环境。澄江时期沉积的厚大泥沙建造,为后期陡山沱期形成无障壁浅滩缓坡相环境提供了物质基础。  相似文献