陕西省山阳县夏家店金矿地质特征及其矿床成因

<正>0前言夏家店金矿床位于陕西省山阳县东南部,矿体产于南秦岭陡岭古隆起边缘寒武系—震旦系碳-泥-硅质板岩及白云岩中[1],属于卡林型金矿床。1含矿岩系特征夏家店金矿床产于山阳—柞水—修石崖断裂下盘—镇安断裂次级断裂系统中。整体构造线方向为近东西向,矿区内未见岩浆岩出露。震旦系地层有陡山沱组(Z2d)和灯影组(Z2dn),陡山沱组分布于矿区北     

宁强县铜厂湾金矿成矿地质特征及控矿条件浅析

陕西省宁强县铜厂湾金矿位于"勉略宁"三角地带内的勉县—阳平关断裂带上,金矿(化)体主要赋存于震旦系灯影组(Z_2dn~2)层内压扭型逆断层破碎蚀变带中,其含矿岩性为震旦系灯影组第一岩性段(Z_2dn~(2-1))和第二岩性段(Z_2dn~(2-2))构造接触部位的构造角砾状硅质白云岩中,矿床成因类型属地下热卤水渗滤型金矿床,为碳酸盐岩石中的微细粒浸染型金矿床。     

湘西辰溪-沅陵黄铁、铅锌矿集中区成矿地质特征、控矿因素及找矿标志

湘西辰溪-沅陵黄铁、铅锌矿集中区在大地构造区划上处于扬子克拉通的东南缘江南造山带西段的雪峰弧型隆起区.矿层赋存于震旦系陡山沱阶底部(Z1bd)微晶白云岩中,其严格受岩性、岩相古地理、顶底板围岩、褶皱构造的控制.其成矿过程可分为两个阶段:第一阶段为同生-成岩阶段,大部分黄铁矿在此阶段形成,铅锌在同生沉积期仅形成矿胚;第二阶段为成岩-后生阶段,在循环热液的作用下,上覆、下伏地层及围岩地层中的Pb、Zn经萃取、活化形成成矿流体,运移至储盖层条件好的陡山沱阶底部的白云岩层中富集成矿.其成矿期后的改造是多期次的,并与雪峰隆起区经受的构造地质事件有关.震旦系陡山沱阶(Z1bd)为该区的找矿层位标志,潮下-泻湖白云岩相的背斜为该区找矿的构造标志;此外,找矿标志还有地表金属氧化物、物化探异常、地貌标志、民采痕迹等.     

新晃贡溪重晶石矿地质简介

新晃贡溪重晶石矿是我国目前发现的规模最大的一个沉积型重晶石矿。矿区位于湘黔两省接壤处。大地构造位置属扬子地台江南古陆的雪峰古陆湘黔桂隆起带。含矿岩系为震旦系上统陡山沱组白云岩、留茶坡组硅质岩及寒武系下统牛蹄塘组下段碳质页岩。其中后者是主要含矿层,由碳质页岩、重晶石、钙质磷块岩、硅质岩组成,厚10.8—     

川西地区震旦纪地层新发现

川西绵竹清平地区震旦纪地层齐全,出露有震旦系陡山沱组和灯影组,灯影组包含灯一段至灯四段的全部地层。陡山沱组为一套滨岸至浅水陆棚相砂泥岩夹浊流相白云岩。灯一段和灯二段为大套典型的局限台地相凝块白云岩、藻纹层白云岩和叠层石白云岩,富含葡萄状、花边状构造,残余厚度500～600m;灯三段为一套灰黑色页岩夹黑色硅质岩,夹少量薄层白云岩,残余厚度12～88m;灯四段主要为一套浅灰色、灰白色厚层凝块白云岩、藻纹层白云岩,夹少量砂质白云岩,含黑色和白色硅质条带,残余厚度115～869 m,沉积相为典型的局限台地相。     

云南省东川矿区白沙包铜矿地质特征及找矿方向

白沙包铜矿赋存于震旦系陡山沱组地层中、下部,为陆源沉积建造型铜矿。文章从矿床地质特征、成矿地质背景、成矿物质来源、,成矿环境条件和成矿作用等进行了分析研究,提出该区存在二个局限沉积盆地赋存含矿地层陡山沱组,且分布面积大,具有较大找矿潜力,并指出了找矿方向。     

湖南古丈凉亭坳重晶石矿地质特征与找矿潜力分析

湖南古丈凉亭坳重晶石矿床产于古丈逆断层南东侧之北东向次级断裂破碎带中,赋矿围岩主要为上震旦统陡山沱组黑色页岩、泥质白云岩.矿体呈脉状、透镜状产出,主矿体延伸稳定,矿石质量好.围岩蚀变主要为重晶石化、硅化、碳酸盐化和黄铁矿化.通过对本区矿床地质特征、矿床成因的分析,认为本区重晶石矿为低温热液型矿床,Ⅰ号矿体深部及南东桐木...     

贵州省丹寨老东寨铅锌矿床地质特征及控矿条件分析

对贵州省丹寨县老东寨铅锌矿床地质特征、含矿地层以及构造进行分析,矿体主要赋存于陡山沱组一段碳酸盐岩地层中,层控特征明显。矿体主要受矿区北东向F21断层破碎带控制,产状与破碎带产状基本一致,该断层为含矿热液导矿构造,同时也是容矿构造。有益组分以Pb、Zn为主,并伴生有Ag、Ge、Ga。矿体厚度变化为较稳定,品位变化均匀,估算铅锌金属资源量逾40万吨,达中型矿床规模,为该区域震旦系陡山沱组地层中首次发现的单矿体规模达中型的矿床规模。     

山东栖霞杨家夼金矿地质特征及控矿条件分析

杨家夼金矿产于粉子山群张格庄组、蓬莱群豹山口组地层中,从其控矿岩性及矿化特征来看应为类卡林型金矿床。地层主要以大理岩、透闪大理岩、透闪片岩、钙质板岩、千枚状板岩、黑云变粒岩、二云片岩为主。金矿主要赋存于岩性变化复杂的薄层状大理岩、透闪大理岩、板岩、透闪片岩中,除岩性控矿外,构造也具有明显的控矿性,当断裂构造切穿或与这些成矿有利岩性叠加时,金矿化更为明显,而岩性分界线或层间破碎带也是该类金矿的有利赋存部位。     

湖南铲子坪金矿的成矿规律及找矿标志

铲子坪金矿位于雪峰山构造岩带的白民山花风岩外接触带附近，是产于震旦系中的构造破碎带蚀变型金矿床，断裂和岩浆活动联合控矿，金矿化与硅化密切相关。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

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).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with     

PALEOZOOLOGY

正20141609 Chen Guiying(College of Earth Sciences,Guilin University of Technology,Guilin 541004,China);Han Nairen New Materials of Stylophora from the Upper Cambrian of the Jingxi Area,Guangxi,South China(Acta Palaeontologica Sinica,ISSN0001-6616,CN32-1188Q,52(3),2013,p.288-293,2 illus.,12 refs.)Key words:Stylophora,Guangxi     

GEOPHYSICS

正20140634 Cao Lingmin(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China);Xu Yi Finite Difference Tomography of the Crustal Velocity Structure in Tengchong,Yunnan Province(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(4),2013,p.1159-1167,6illus.,35refs.,with English abstract)