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边家大院铅锌银多金属矿床为大兴安岭中南段新发现的一个典型的热液脉型矿床,矿体呈脉群状产出。文章通过对矿区5个钻孔岩心进行系统采样和光谱测试分析,运用格里戈良分带指数法和数理统计方法(相关分析、聚类分析、因子分析)对矿区A—A′勘探线矿脉群的原生晕特征进行了详细系统的研究。认为矿脉群原生晕分带明显,前缘晕元素为Sb、Hg、As,尾晕元素为Mo、W、Sn、Bi,近矿晕元素为Pb、Zn、Ag、Cd、Cu、Au;垂向分带序列为Sb-Co-Zn-As-Mo-W-Bi-CdPb-Hg-Sn-Ag-Cu-Ni-Au,出现了Mo、W、Bi的"反向分带"现象,具有两个阶段成矿作用;成矿元素(Pb、Zn、Ag)和前缘晕元素(Hg、As)在矿脉群下部异常值较高,且异常向深部延伸,推测矿区深部可能存在隐伏矿脉群。综合上述特征,初步建立了矿区的成矿成晕理想模型。 相似文献
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五龙金矿是辽东地区大型岩浆热液型金矿床,163矿脉是矿区内目前发现的最大含矿构造。为进一步探测深部找矿潜力,近几年矿山对163矿脉进行了大量的探采工程,其中在-762 m坑道实施了600 m钻孔。本文在详细编录该钻孔的基础上,对全孔样品进行成矿元素测试工作,利用SPSS软件对所得测试数据进行元素相关性、聚类、因子分析。相关性分析显示,具有显著正相关的元素主要为Bi、W、Cu、Ag、Au和As、Sb、Sn、Zn两组;Mo元素与Sn、Ag、Cu、Bi、W、Sb地素具有显著正相关性,而Pb元素与Cu、Mo、Au、W元素呈显著负相关性,Hg元素与其它元素相关性不明显。聚类分析结果表明,R型聚类在类的距离为5的水平上,这些元素明显可分为3组：Hg、Cu、Pb、Zn、Sn、Mo、As、W;Ag、Au、Sb、Bi。因子分析结果表明,提取3个因子可以反映出12个元素变量64.42%的地球化学信息,F1的主要载荷因子组成为Sn、Ag、As、Zn、Sb, F2的主要载荷因子组成为Au、W、Bi、-Pb, F3的主要载荷因子组成为Hg。根据成矿元素随深度变化特征,结合前人构造叠加晕研究成果,推测该钻孔深部还... 相似文献
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山东招远前孙家金矿床地质和元素地球化学研究 总被引：6，自引：1，他引：5
对矿区地表和井下四个中段共采集地层、岩体、蚀变岩、石英脉和矿体样品503件,测试了Au、Ag、As、Sb、Cu、Pb、Zn、Sn、Bi、Mo、Co、Ni、Mn、Cr、V、Ti、Ba、Rb和Sr等19种元素的含量,运用Suffer软件编制了19种元素的矿脉地球化学纵剖面图,根据格里戈良分带指数法计算了元素的地球化学分带,建立了原生晕地球化学立体分带模式。综合地质地球化学资料分析得出以下认识：由花岗岩→钾长石化花岗岩→绢英岩化花岗岩→绢英岩→石英脉或硅化带→金矿石,随着蚀变作用增强,成矿元素Au、Ag、As、Cu、Pb、Bi、Mo、Sb增加,然而成矿作用主要发生在绢英岩化后的硅化阶段。矿区成矿元素Au、Ag、As、Cu、Pb、Sn、Bi、Mo、Co．Ni含量呈多峰分布,分布范围大,离散度大,其中Au、Ag高含量峰值区峰型突出,成矿富集趋势强烈。矿区成矿阶段可分为：石英-金-黄铁矿阶段、石英-金-多金属硫化物阶段和石英-碳酸盐阶段。F1因子（Au、Ag、As、Co、Ni、Sn、Bi）为主成矿阶段的元素组合,F3因子（Mo、Sb）和F5因子（Cu、Zn）反映了成矿热液活动的多期叠加。F4因子Rb、Sr、Ba组合在本区最具典型意义,Rb与Sr、Ba为对抗性元素,Sr、Ba、Ca低值带,Rb、K高值带恰好与Au、矩高值带吻合,显示花岗岩长石类矿物的钾长石化和绢云母化与成矿关系密切。与矿体的侧伏方向一致,总体上矿脉纵剖面地球化学高值带均向SW侧伏。其中Au、Ag高值带宽且比较连续,上下均未封闭,结合金矿体虽已出露地表但规模不大和原生晕分带特征,推测为一浅剥蚀矿床,向SW深部仍有一定延深。矿区原生晕分带序列自上而下为（Hg2、Sr、Ba、Rb）→（矩、Au、Sn、Mo、Cu→（Zn、Pb）→（Sb、Mn）→（Ni、V、Co、As、Hg1、Bi）。As、Sb、Hg高值带偏于中下部,可能指示下部隐伏矿体的存在。 相似文献
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也金嘎波金矿位于冈底斯成矿带上,是对区域化探发现的Au、As多元素组合异常进行追踪发现的,属于热液型金矿床。矿区各类岩石Au、As、Sb、W、Hg、Ag、Bi、Pb元素平均值高于中国丰度值数倍以上,表明矿区具有丰富的物质来源基础。岩石地球化学研究证明,矿床地表发育Au、As、Sb等10多个元素组合异常。其中Au是成矿指示元素,As、Sb、W是密切伴生元素,Bi、Ag、Pb、Hg是一般的伴生元素。多元素组合异常浓度带发育,浓集中心互相套合叠置部位指示金矿(化)体位置。矿体指示元素(Au、As、Sb、W、Hg、Bi、Ag、Pb)异常分布在岩体、地层接触带和构造交汇处,显示金矿与岩浆活动、热液作用和断裂构造相关,属多次构造作用、岩浆热液叠加富集而成。该金矿床处在冈底斯成矿带内,此研究对该成矿带金异常的识别和查证,寻找新的金矿具有借鉴意义。 相似文献
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该文以山东招远大尹格庄金矿床中微量元素为研究对象,通过对矿床围岩、矿石等微量元素的研究,表明大尹格庄金矿围岩中微量元素以富含 Bi,Au,Pb,W,Ag,Sn 为特点,矿体和矿化体中元素组合为 Au,Ag,As,Sb,Hg,B, Cu,Zn,Bi,Mo,Mn,Co,Ni,W。在5个成矿阶段中,第二阶段与第三阶段微量元素的富集程度较明显,表现为 Au, Ag,As,Co,Bi,Cu,Pb,Zn 等的富集,成矿元素可分为2个分带序列,主成矿元素为 Au Ag Cu Pb Zn Bi 组合、头晕元素 As Sb Hg 组合和尾晕元素 Co Ni 组合。 相似文献
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胶东山后金矿床地质体微量元素特征及找矿意义 总被引：3，自引：0，他引：3
对胶东招平断裂上的山后金矿34个钻孔进行了原生晕测量,分析了Au、Ag、cu、Pb、zn、As、Sb、Bi、Mo、Hg等10种元素,统计了胶东岩群、荆山群、玲珑花岗岩及招平断裂蚀变带中微量元素含量及变化.变质岩、花岗岩均富Bi、Ag,而贫Hg、Sb、Au、Cu、zn、As;胶东岩群、荆山群中金的丰度值相近,它们均为金矿的矿源岩;在招平断裂蚀变带中Au、Ag、Pb、Mo、Bi等元素出现了明显富集,而Cu、zn、Sb、Hg等元素没有富集,矿床多金属硫化物阶段不发育;根据聚类分析结果,Au与Ag、Cu、Pb、zn生成于不同的成矿期,招平断裂中的Au矿体形成于金成矿期,招平断裂上盘荆山群地层中的Au、Ag、cu、Pb、Zn多金属矿体形成于金银多金属成矿期;招平断裂北段的成矿条件要比南段好;根据As、Mo元素含量的变化,确定出山后金矿深部矿体预测的简单准则,并对金矿深部进行了简单成矿预测. 相似文献
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《矿产与地质》2017,(2)
针对矿区地表及井下四个中段共采集地层和构造蚀变岩样品194件,分析Ti、V、Cr、Mn、Co、Ni、Au、Ag、Cu、Pb、Zn、W、Sn、Mo、Bi、As、Sb、Hg等18种微量元素含量,编制各元素地球化学0号勘探线横剖面图,综合利用地球化学图件分析法与格里戈良分带指数法,确定元素的轴向分带序列。通过地质地球化学资料可知,石英闪长岩、构造蚀变岩中Cu、Ag、As、Au、Mo、Sn元素含量高,变异系数大,表明这些元素参与成矿蚀变作用。矿区原生晕轴向分带序列为:(Zn、Cr1、Hg1、Ni、As)→(Pb、V、Mn、W、Cr_2、Ti)→(Hg_2、Sb、Co、Bi、Sn、Ag、Au、Mo、Cu),根据元素地球化学横剖面图中主成矿元素异常高值带向下延伸未封闭、矿体向下未尖灭、特征前缘晕元素Hg、成矿晕元素Cu出现矿尾晕等特征,说明矿体向下仍有一定的延伸,预示着深部具有一定的找矿潜力。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献