花牛山喷流沉积型银铅锌矿床综合找矿方法

花牛山银铅锌矿床是上世纪50年代发现、勘查和确立的一处中型银铅锌矿床①.自矿床发现以来,诸多单位先后在矿区与外围开展以金银铅锌为主的找矿工作,但由于受"岩浆热液夕卡岩型矿床"成因认识的局限,地质找矿主要围绕印支期花岗岩体外接触带开展工作,铅、锌储量一直未有显著增长.     

湖南蛇形坪—横山岭矿区银的成矿条件分析

蛇形坪—横山岭矿床原为—中型铅锌矿床,由于其含银平均达160×10~(-6)左右,且在矿石中的银也主要以独立银矿物产出.因此,构成了铅锌银矿床.在综合分析矿区银的成矿条件后,认为该矿区具有良好的银成矿远景,特别是在横山岭矿区及其外围可能有独立银矿体的存在.因此,今后应注意寻找贫铅锌型或斑岩脉型银矿床.     

冀北银矿床类型、矿床地质地球化学、地史-演化模式及找矿方向

对冀北１７个银矿床地质调查和５个大一中型银矿床地质、地球化学剖析研究基础上,从银矿床产出的区域地质、矿床地质、控制地质条件、围岩蚀变、矿石类型、成矿机理、成矿时代和成矿物质演化上,确定了冀北银矿床有３个成矿系列,８种矿床类型。提出牛圈子为火山喷气－热泉型银矿床;蔡家营为古喷气－热水沉积变质－热液叠加型铅锌银矿床;银冶岭为层控－热液叠加型铅锌银矿床的新认识,建立了冀北银矿床成矿模式和地史演化的区域成     

内蒙古扎兰屯市二道河铅锌银矿床地质特征及成因探讨

<正>二道河铅锌银矿床位于内蒙古扎兰屯市柴河镇西北部,是一个新近发现的铅锌银多金属矿床。据该矿床2012年详查结果,已探明的铅锌储量达到中型规模,具有较大的开发利用价值。由于该矿床发现较晚,加之该区植被覆盖严重,对该矿床成矿理论研究十分薄弱(王忠等,2012),笔者在对该矿床区域地质背景、矿床地质特征研究的基础上,探讨其矿床成因,以期为今后对该矿床的勘探及外围预测提供理论依据。     

新书简介

《滇东北铅锌银矿床规律研究》柳贺昌　林文达　编著滇东北是云南省古代产银、现代产铅锌银的重要地区 ,它西接四川省南部 ,东邻贵州省西北部 ,构成滇、川、黔铅锌银成矿区。区内成矿作用强烈 ,矿床、矿点、矿化点多 ,分布密集 ,是我国铅锌银资源基地之一 :已探明铅锌银矿床 78处 ,其中大型矿床 6处 ,大型银矿床 1处 ,中型铅锌银矿床 1 8处 ,小型铅锌银矿床 5 3处 ;还有数以百计的矿点、矿化点。各矿床大多伴生有银、锗、镉等多种伴生元素 ,并能综合回收利用。本书依据滇东北、川南、黔西北大量区域地质、古地理、矿床地质、地球化学等实际…     

新疆乌拉根铅锌矿床成因探讨

通过对乌拉根铅锌矿床的地质特征与金顶超大型铅锌矿床特征详细对比研究 ,确认乌拉根铅锌矿床是海底喷流沉积型铅锌矿床 ,指出矿床及其外围具有大型 -超大型规模找矿潜力     

西大明山银铅锌金钨铋矿地质特征、成矿规律及成矿模式

文章简要介绍了广西西大明山地区的地质背景及银矿床、铅锌矿床、钨铋矿床、银铅锌金矿床地质特征,初步分析、总结和探讨了该区银铅锌金钨铋矿床的成矿规律,认为该区赋矿层位主要为寒武系,次为下泥盆统莲花山组,成矿物质来源于寒武系、下泥盆统岩层及深部岩浆岩,银铅锌等矿床导矿控矿主要为EW向、NE向断裂,EW向、NE向及其次级断裂为主要控矿容矿断裂,层控蚀变岩型钨铋矿受层位、岩性及褶皱构造控制明显,成矿与含钙层位关系密切,具多期成矿作用,成矿时代主要为燕山期,并提出该区银铅锌金钨铋矿成矿模式,指出银铅锌金钨铋矿的找矿方向,对该区今后的地质找矿工作具有一定的指导意义。     

四川巴塘砂西银铅锌矿床特征与找矿远景

砂西银铅锌矿床产于燕山晚期黑云母二长花岗岩俸外接触带上，矿体赋存于上三叠统图姆沟组变质砂岩、板岩中的北北西向顺层破碎带内．矿石矿物以铅锌硫化物为主，主成矿元素银铅逛锌的资源量达大型以上规模，属中低温热液型富银铅锌矿床。矿床本身及其外围均具有很大的找矿潜力。     

安徽省铜陵县荷花山铅锌银多金属矿地质特征及成矿规律

铜陵县荷花山铅锌银多金属矿区位于扬子陆块,下扬子地块,沿江褶皱带的中部,是近年来实施安徽省地勘基金项目新发现的矿床,为一中型隐伏矿床,属中低温岩浆热液矿床,具有较高的科研和经济价值。现已探明铅金属量12×10~4t,锌金属量28×10~4t,银金属量112t,在其深部和外围仍显示有良好的找矿前景。本文深入总结了该矿的矿床地质特征,初步理清了该矿的矿床成因,将对下部地质找矿及区域地质找矿起到指导和借鉴作用。     

江西潭坑铅锌(银)矿床特征及成因分析

江西省潭坑铅锌(银)矿区位于北武夷铅锌银成矿带内,本文系统阐述了矿区地质和矿床特征,并对矿床的成因进行了探讨.认为本区铅锌(银)矿床,经历了火山喷发沉积和后期热液充填两大成矿期,与次火山岩体(流纹斑岩)有密切的关系,属次火山热液矿床.     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

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GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)     

GEOCHEMISTRY

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