河北省牛圈银(金)矿床成因初探

通过对牛圈银(金)矿床的细粒花岗岩、隐爆角砾岩、同位素特征等方面研究,笔者认为与矿床关系密切的隐爆角砾岩(次火山岩)由基底岩石的部分重熔形成,而成矿物质来源于下地壳-上地幔重熔岩浆;成矿热液为重熔岩浆分异演化形成的富气相流体。这些热液与次火山岩浆相伴或滞后上升,经多次隐爆作用在破碎带中形成矿床。银矿体呈脉状产出于粗粒花岗岩之破碎带中,含矿岩石为隐爆角砾岩。熔浆物质既成角砾又呈胶结物,成矿带发育中低温热液蚀变。矿床为含矿凝灰岩(英安质)熔浆经隐爆作用形成的浅成中低温热液矿床。     

黑龙江东安金矿床成矿机理

东安金矿床是与中生代火山．潜火山岩有关的浅成低温热液型，产于乌底河断陷盆地中的库尔滨凹陷与宝山隆起带衔接部位，靠近隆起带一侧。成矿初始深度为0．2-1．0km，属浅-超浅成环境。成矿的最佳温度为260～300℃，矿石Rb-Sr等时线年龄为108Ma，成矿物质主要来源于新元古代变质中酸性火山-沉积建造，成矿流体来源于岩浆水，后期有大气降水不断加入。成矿流体在向浅部运移过程中，从基底新元古界一面坡群额头山组变质中酸性火山．沉积建造中萃取成矿物质和介质，由于大气降水的不断加入，流体混合和浅部减压作用使含矿流体沸腾，导致温度下降和隐爆作用发生，Au与大量的SiO2一起沉淀。     

赣南印支期中硫化型浅成低温热液银矿床的发现和意义

近年,在中国赣南的会昌县年坑地区新发现一浅成低温热液银矿床,其矿体赋存在隐爆角砾岩筒内,隐爆角砾岩的胶结物由富锰碳酸盐类矿物(含锰白云石-锰白云石-菱锰矿-含锰方解石)-石英-白云母-含银硫盐(黝铜矿-硫银锗矿)-硫化物(辉银矿、方铅矿、半透明闪锌矿和黄铁矿)-自然银组成,成矿具有中硫化型特征.年代学研究表明,年坑银矿床形成于三叠纪(印支期),是华南地区首例印支期中硫化型的浅成低温热液矿床.对该矿的成矿时代和成矿特征的详细研究,指示华南地区具有寻找印支期同类型浅成低温热液银矿及相关斑岩钼或锡矿床的潜力.     

内蒙古翁牛特旗二把伙银多金属矿区地质特征及找矿前景分析

文章通过对内蒙古翁牛特旗二把伙银多金属矿区地质特征综合分析,认为矿区成矿作用类型为与火山穹窿构造形成有关的隐爆角砾岩成矿,成矿作用受断裂构造和火山机构双重控制;从浅表至深部,矿床类型依次为浅成低温热液型、裂隙充填隐爆角砾岩型和斑岩型（隐爆角砾岩筒型）。为二把伙银多金属矿区深部找矿提供了理论依据。     

河北丰宁牛圈银金矿床构造地质特征

牛圈银金多金属矿,华北地洼北缘。成矿条件明显受燕山晚期地洼活动－陆壳伸展运动所形成的断裂构造和火山机构控制,矿床呈隐爆角砾岩筒状,具浅成低温热液型矿床特征。     

黑龙江金厂金矿床地质特征及成因探讨

通过对矿体围岩花岗闪长岩、花岗斑岩类和隐爆角砾岩筒控矿-容矿构造及矿石组分的研究,将金厂矿床金矿化类型分为破碎蚀变岩型、裂隙充填型和角砾岩型;对矿物学和同位素地球化学的研究结果表明,成矿物质主要来源于深部(岩浆源),在成矿作用早期阶段成矿流体主要为岩浆水,晚期阶段有部分大气水的加入.金厂金矿床是中生代火山-次火山活动的产物,矿床属浅成低温岩浆期后热液型金矿床.     

新疆哈尔里克双峰山浅成低温热液金矿床的地质特征与成矿模式

对新疆东准噶尔哈尔里克构造带上双峰山金矿床的地质特征、矿床蚀变分带进行了初步研究，表明潜火山热液与火山热泉参与了成矿。这两个成矿阶段同源同位的蚀变矿物晕(带)叠套，造成双峰山矿床蚀变分带从上至下为隐爆硅质角砾岩化带、低金品位硅质岩带、石英(冰长石)网脉带(矿体)、黄铁矿蒙脱石化带和青磐岩化带。该矿床的成矿流体与晚古生代造山初期深成流纹质熔浆的陆相喷发有关。火山热泉循环形成蚀变晕，此阶段有大气降水的参与；潜火山热液成矿阶段发育的低温微细石英网脉中含冰长石和绢云母。双峰山矿床是晚古生代火山地区典型的冰长石-绢云母型浅成低温热液金矿床。     

满洲里地区银铅锌矿床成矿流体特征及矿床成因

满洲里地区是得尔布干成矿带最重要的银铅锌矿床产出地区。文中以额仁陶勒盖银矿床和查干布拉根银铅锌矿床为例,系统研究了该区银铅锌矿床成矿流体特征,探讨了矿床成因类型。研究表明,额仁陶勒盖银矿床以气液两相水溶液包裹体为主,流体包裹体均一温度为242～334℃,平均265℃,盐度(质量分数)为1.73%～4.48%NaCl_(eqv),平均2.70%NaCl_(eqv),流体密度为0.72～0.84 g/cm~3,平均0.80 g/cm~3,流体压力为13～26 MPa,平均18 MPa,对应的成矿深度为0.5～1.0 km,平均0.7 km,成矿流体总体上属于H_2O-NaCl体系。查干布拉根银铅锌矿床发育气液两相水溶液包裹体、含CO_2包裹体和纯CO_2包裹体,流体包裹体均一温度为179～367℃,平均261℃,盐度(质量分数)为2.23%～6.87%NaCl_(eqv),平均4.35%NaCl_(eqv),流体密度为0.65～0.91 g/cm~3,平均0.82 g/cm~3,成矿压力为15～46 MPa,平均25 MPa,对应的成矿深度为0.6～1.7km,平均0.9 km,成矿流体总体上属于H_2O-CO_2-CH_4-NaCl体系。两个矿床的成矿流体均属于中低温、低盐度、中等密度流体。额仁陶勒盖银矿床成矿流体主要来自大气降水,大气水的混入是银沉淀的主要机制,其矿床成因属于浅成低温热液型;查干布拉根银铅锌矿床成矿流体属于岩浆水与大气降水的混合水,流体不混溶作用或沸腾作用是查干布拉根矿床银铅锌沉积的主要机制,其矿床成因属于中低温热液脉型。满洲里地区银铅锌矿床的成矿时代为早白垩世,成矿与晚侏罗世—早白垩世火山-侵入岩浆活动晚期的火山-次火山热液密切相关,矿床产出于伸展背景下的中生代陆相火山断陷盆地中。     

吉林东部地区与火山岩-斑岩有关的金(铜银)矿成矿地质特征及其成矿模式

吉林东部地区与火山岩-斑岩有关的金(铜银)矿床可分为浅成低温热液型金(银)矿和浅成中温斑岩。热液型金(铜)矿两个亚类。浅成低温热液型矿床的特征矿物组合为黄铁矿、石英、方解石、冰长石和重晶石,成因上与高钾的钙碱性火山岩。斑岩(137～177Ma)有关,成矿流体属浅成低温氧化流体,在成矿过程中大气降水混入的程度大。浅成中温斑岩,热液型矿床的特征矿物组合为黄铁矿、黄铜矿、磁黄铁矿和石英,成因上与钙碱性火山岩。斑岩(130～140Ma)有关,成矿流体属浅成中温还原流体,在成矿过程中大气降水混入的程度相对较小。由于火山岩,斑岩的来源深度不同,斑岩体在矿床的形成中所起的作用不同,成矿流体的性质不同,造成金矿床的类型不尽相同。     

山东邹平火山岩地区铜矿床成矿流体的形成、演化及成矿

邹平地区与火山岩浆热液作用有关的铜矿床主要可划分为2种类型：一类为斑岩-火山角砾岩型,另一类为浅成低温热液型;代表性矿床分别为王家庄斑岩一火山角砾岩型铜（钼）矿床和南洞子浅成低温热液型铜（金）矿床。流体包裹体研究表明：王家庄铜（钼）矿床成矿流体的均一化温度和盐度偏高,出现了富气相的两相水溶液包裹体、富液相的两相水溶液包裹体和含子晶的三相水溶液包裹体共存现象,加温后,富气相包裹体均一到气相,同期富液相包裹体均一到液相的特征,这表明成矿流体在形成和演化过程中曾发生过沸腾作用。南洞子铜（金）矿床成矿流体均一温度和盐度偏低,以上3种包裹体共存的现象不明显,说明成矿流体在形成和演化过程中沸腾作用不强。上述2类矿床矿化脉石英中的δ^18OH2O-δD投影点飘离岩浆水范围,参照流体包裹体研究结果,证明邹平地区与火山岩浆热8液作用有关的铜矿成矿流体主要来源于岩浆水,后期混人大气降水。相比之下,浅成低温热液铜矿成矿流体中的大气降水混入量多。     

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)