安徽省枞阳县牛头山铜矿床地质特征、矿床成因、找矿标志及找矿方向分析

通过对矿床的地质特征、矿体赋存规律、矿化蚀变,矿石类型、结构构造,围岩蚀变等分析,初步认为本矿床应与双庙旋回晚期火山、次火山岩有关的中-低温热液充填交代型矿床;初步认为下步找矿方向应继续在龙门院组底部的第一岩性段的矿化蚀变带中沿矿体倾向方向深部和沿走向方向寻找深部矿体.     

安徽庐枞盆地硫铁矿床地质特征及控矿因素

庐枞盆地为一陆相火山岩盆地，成硫与中—中基性富碱打质火山—次火山岩活动有关，受岩侵型火山隆起、断裂及接触带构造控制，矿体主要产于粗安玢岩顶部及侏罗系上统龙门院组和砖桥组火山岩中，次为前火山岩系碳酸盐岩和钙质碎屑岩中。硫铁矿常与铁、铜、硬石膏等矿产共生或伴生，形成综合型矿床。硅化等热液蚀变与矿化关系密切，为找矿的重要标志。     

云南澜沧县南现铜铅矿特征及找矿标志

云南澜沧县南现铜铅矿矿体呈似层状、脉状主要赋存于断层破碎带中,矿体近矿围岩为中侏罗统花开左组(J2h)碎屑岩系。及其。矿床成因属断裂构造控制的热液型铜铅锌多金属矿床。具矿化蚀变的构造破碎带及地球化探异常高值区是重要的找矿标志。     

云南云县栗树街铜矿地质特征及找矿方向

栗树街铜多金属矿矿体呈脉状、透镜体状,主要赋存于断层构造破碎带中,矿体围岩均为三叠系上统小定西组富钾的中基性火山岩,区域上该火山岩系为重要的含铜多金属矿赋矿层位。矿床受构造控制明显,蚀变矿化类型有黄铁矿化、硅化、碳酸盐化、褐铁矿化、绿泥石化、绿帘石化等。     

河北省麻子沟铅银矿床地质特征及理想成矿模式探讨

麻子沟铅银矿床为次火岩—中低温热液矿床。次火山岩侵入活动过程中的热液,是成矿的主要热液来源。热液沿断裂破碎带溶解地层中的成矿物,使其在热液中富集,在成矿有利部充填、交代围岩形成矿体或矿化。通过对成矿条件、地质特征、控矿因素、矿化蚀变特征及矿体赋存位置分析,建立理想成矿模式,明确区内的找矿方向。     

云南会泽县小江铅锌矿特征及找矿标志

云南会泽县小江铅锌矿矿体呈似层状、脉状、透镜状赋存于断层构造破碎带中,构造控矿明显,矿体围岩均为灯影组(Z_2dn)白云岩矿床成因为热液交代-充填型原铅锌矿床。断裂构造加上硅化、黄铁矿化、萤石化、斑马状白云岩化、重晶石化、等矿化蚀变是主要的找矿标志。     

内蒙古喀喇沁旗大西沟萤石矿矿床地质特征及找矿方向

内蒙古喀喇沁旗大西沟萤石矿为20世纪40年代发现的一处大型萤石矿床。矿区内共有9条矿体，均赋存于断裂破碎带内，其形态、产状受构造严格控制。通过对该矿地质特征、矿体特征、围岩蚀变以及矿石的稀土元素地球化学特征进行分析，认为大西沟萤石矿属于比较典型的热液裂隙充填型矿床。在综合研究的基础上，提出应该在萤石矿化带、硅化蚀变带以及构造破碎带发育位置开展找矿勘查工作。     

云南广南县老寨湾金矿地质特征及找矿标志

广南县老寨湾金矿位于滇、黔、桂“金三角”重要成矿区带上,金矿体矿体呈似层状赋存于断层构造破碎带或层间构造破碎带中,构造控矿明显。矿体围岩均为下泥盆统坡松冲组第一段(D1ps1)硅化石英砂岩;矿床成因属中-低温热液叠加改造型金矿床,断层构造、硅化等矿化蚀变及地球化学异常是重要的找矿标志。     

辽西石洞沟金矿地质特征及找矿方向探讨

石洞沟金矿位于华北地台北缘的冀东-辽西金多金属成矿带东段,属产于元古宙隆起带内碳酸盐岩中的微细浸染型金矿。据矿体赋存围岩的不同,可分为两种矿石类型:赋存于雾迷山组上部燧石条带白云质灰岩碎裂岩带中的硅质角砾岩型和赋存于铁岭组二段含锰灰岩蚀变破碎带中的破碎蚀变岩型。通过对矿床地质特征的分析,认为矿体产出严格受老马家推覆构造控制,该推覆构造既是导矿构造,又是储矿构造。两种不同类型的金矿化应是该推覆构造所形成的同一成矿系统、同一成矿机制作用的产物。结合矿区地质环境、矿体产出特征与微量元素特征以及矿床成因机制分析,初步认为该矿床成因与深部岩浆或与火山隐爆作用有关,属浅成低温-超低温热液充填型矿床,并具有多期矿化叠加的特征。同时,总结矿体赋存规律,进一步指出该区勘查工作方向,认为该区找矿前景广阔。     

滇西大平掌铜矿成矿地质条件及找矿前景

大平掌铜矿位于滇西澜沧江火山岩带的中南段,矿体呈层状、似层状赋存于泥盆纪-石炭纪的一套细碧-石英角斑岩系中,矿体具明显的"上层下脉"双层结构特征,即上部为块状矿体,下部为细脉-浸染状矿体。矿床为火山岩型块状硫化物(VHMS)特征矿床。矿石的金属矿物为铜-铅-锌-金-银矿物组合为主,矿化及蚀变具明显的分带性。沿矿区北西向控岩控矿构造带南北两端及西侧具有较好的找矿前景。     

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)