东秦岭钼矿床及其深部构造制约

在东秦岭地区分布14个大型、中、小型的钼矿床,构成了长200 km、宽20 km的巨量钼矿化集中区.根据对钼矿床特征分析,矿床形成在燕山期活动的中酸性小岩体内部、接触带和外围,岩石类型主要有花岗斑岩和石英二长岩,它们具有较高的酸、碱和钾含量特征.主要的矿床类型有:①斑岩型钼矿;②斑岩-夕卡岩型钼矿;③夕卡岩型钼矿;④爆破角砾岩型钼矿;⑤热液脉型钼矿.尽管这些矿床类型不同,但是他们都与花岗斑岩的活动有关,深部格子状构造控制了一系列中酸性花岗岩浆的侵位和构造-岩浆-流体成矿作用.     

辽西杨家杖子-八家子钼多金属成矿带——典型钼矿床特征及找矿远景预测

辽西杨家杖子-八家子钼多金属矿成矿带钼矿床与燕山期中酸性岩体关系密切.产于花岗质岩类与碳酸盐岩地层接触带的钼矿床为夕卡岩型或斑岩-夕卡岩型钼矿床.产于花岗斑岩、长英质或中性火山岩内的钼矿床多为斑岩型钼矿床.不同类型钼矿床在成因、分布规律以及成矿元素的分带性上有着密切的时空关系.钼矿床的成矿物质来源于花岗岩,细粒花岗斑岩是主要成矿母岩.从成矿条件分析可确定,该钼多金属成矿带的找矿远景可观.     

西藏冈底斯中东段夕卡岩铅锌矿控矿构造特征及模式初探

冈底斯成矿带东段夕卡岩型铅锌矿的控矿条件包括:①地层条件:主要呈层状、似层状产于黑色碎屑岩系与碳酸盐岩的层间构造带内,或呈透镜状产于碳酸盐岩中;②岩浆岩条件:夕卡岩铅锌矿通常与斑岩型铜钼矿在时间上、空间上以及矿床成因上有紧密联系,与成矿有关的岩体主要为二长花岗斑岩、花岗闪长斑岩、石英闪长玢     

东秦岭大别山段斑岩型钼(钨、铜)矿床地质特征

东秦岭大别山段矿化中酸性小岩体集中分布在东秦岭钼(钨、铜)矿带东段,呈带状沿深大断裂两侧分布,受构造控制明显.已发现主要钼矿床属斑岩型,成因多与中生代中酸性花岗质斑岩有关.根据斑岩型钼(钨、铜)矿床地质特征,通过控岩控矿构造、围岩蚀变、矿体特征、矿石物质组份及其成矿机制等方面的研究,把东秦岭大别山段斑岩钼(鸽、铜)矿划分为浅成-超浅成斑岩钼(铜)矿床,中-深成斑岩-夕卡岩钼(钨、铜)矿床两种类型.     

就若干矿床的类型、成矿物质来源及辉钼矿含铼量的地质意义等与毛景文研究员商榷

毛景文研究员等多年来将陕西洛南黄龙铺碳酸岩脉型钼(铅)矿床分别更改为碳酸盐(岩)型、热液碳酸盐脉型或脉型,把河南栾川南泥湖斑岩体形成复合的南泥湖—三道庄斑岩—夕卡岩型钼(钨)矿床,分解为南泥湖斑岩钼钨矿床和三道庄夕卡岩型钼钨矿床,和把长江中下游地区的绝大多数夕卡岩型铜(铝)矿床和少数斑岩—夕卡岩型铜(钼)矿床更改为斑岩—夕卡岩—层控铜—金—钼矿床等。本文对毛景文等更改这些矿床的矿床类型,以及毛景文等认为"辉钼矿的Re含量可指示成矿物质来源","大水沟热液型碲(金)矿床的成矿流体及其他物质主要来自于地幔"和"温泉钼矿是与S-型花岗岩有关的斑岩钼矿床是一种新类型和新发现"等所存在的问题进行探讨。希能理清某些矿床学问题,进一步促进矿床学的发展。     

论辽宁锦西杨家杖子杂岩体的岩浆成因演化及成矿作用

杨家杖子杂岩体中的二长闪长岩代表一种母岩浆,它是燕山早期库拉板块向欧亚板块下俯冲所产生的,并汇聚上升的安山质岩浆。粗粒似斑状二长花岗岩、细粒似斑状二长花岗岩和(碱长)花岗斑岩是二长闪长岩浆在7km深、弱还原环境、氧逸度为10~(-8)～10~(-10)Pa、1200°～1250℃的岩浆房中经结晶分异作用的派生物。以后,这些岩浆相继上侵,定位于2.5km深处。由这些岩浆岩侵入体所引起的镁夕卡岩、钙夕卡岩和岩浆期后酸性热液淋滤蚀变非常发育。只有来自细粒似斑状二长花岗岩和(碱长)花岗斑岩岩浆、富含Mo的酸性热液沿着裂隙侵入夕卡岩中,在240～330℃时,才形成Mo矿床。此种酸性热液也沿着裂隙侵入细粒似斑状二长花岗岩和(碱长)花岗斑岩中,而形成细脉浸染Mo矿床。因此,杨家杖子Mo矿床属于斑岩-夕卡岩型。     

云南澜沧老厂多金属矿床矿石类型及其成因探讨

云南澜沧老厂是三江成矿带南段最重要的铅锌铜钼多金属矿床之一.根据不同的赋矿特征、含矿岩性、矿石构造及成矿元素将澜沧老厂多金属矿床矿石类型系统地划分为铅锌硫化矿石、铅锌氧化矿石、颗粒状含铜黄铁矿石、块状含铜黄铁矿石、夕卡岩型矿石及斑岩型钼矿石6种类型.矿体产状、微量元素地球化学、年代学证据均表明铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石为火山喷流沉积型成因（VMS型），而铅锌氧化矿石、夕卡岩型矿石及斑岩型钼矿石为斑岩热液型成因.其中，铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石的主控矿因素为地层；铅锌氧化矿石为构造；夕卡岩型矿石为岩性；斑岩型钼矿石为岩体.     

冈底斯东段南部第三纪夕卡岩型Cu-Au±Mo矿床地质特征、矿物组合及其深部找矿意义

在冈底斯Cu-Au成矿带东南部的山南地区分布有克鲁、劣布、冲木达和陈坝等中到大型Cu-Au±Mo矿床。与含铜夕卡岩有关的侵入岩形成于20~30Ma之间,为高钾钙碱性中酸性浅成岩,形成于印-亚大陆碰撞晚期构造背景。矿化赋存于岩体外接触带下白垩统比马组的碳酸盐岩和其他钙质岩石内。主要矿化类型为夕卡岩型、热液脉型和斑岩型,构成完整的斑岩-夕卡岩、热液脉状铜-金(钼)多金属成矿体系,矿化组合主要为Cu-Mo、Cu-Au和Cu。外接触带的蚀变以夕卡岩化、角岩化为主,而内接触带上主要为岩体的绢云母化、硅化、绿泥石化等,内夕卡岩不发育。夕卡岩化可分为早期夕卡岩和晚期含水硅酸盐阶段。早期夕卡岩主要为钙铁、钙铝石榴石夕卡岩,含少量透辉石、磁铁矿等,晚期的含水硅酸盐阶段主要是绿泥石-绿帘石、方解石、石英交代石榴石夕卡岩,并伴随含铜硫化物的沉淀,为本区夕卡岩型铜矿形成的主要阶段。含铜硫化物以富含斑铜矿为特征,Au、Ag主要赋存于斑铜矿、硫铋铜矿及黄铜矿等矿物中。山南地区的夕卡岩型铜-金矿床均为浅部夕卡岩,在某些夕卡岩型铜金矿床中显示了斑岩型矿化的存在,可能暗示该区的夕卡岩型矿化与北带相似,具有统一的斑岩型-夕卡岩型成矿系统。因此本区具有在深部寻找斑岩型金矿的可能性,而且找矿潜力较大。     

东秦岭斑岩型钼矿研究的几点新进展

东秦岭位于华北板块与扬子板块的邻接边缘以及它们之间的拼合带-秦岭造山带的东段,有着30多亿年的构造演化历史,由于板块的俯冲、碰撞作用,其构造运动复杂,岩浆活动强烈,不同类型、不同成因的花岗岩十分发育,形成了仅次于美国西部Climax-Henderson斑岩钼矿带的全球第二大钼矿带,其中钼多金属矿床以斑岩型或与斑岩型有关的夕卡岩型为主,斑岩型钼矿占全国已探明储量的56.3%,斑岩型+夕卡岩型占39%,二者共占95.3%.     

青海祁漫塔格卡尔却卡铜多金属矿区矿床地质特征及控矿因素

卡尔却卡地区是青海省重要的铁、铜、铅、锌、金多金属矿集区,具有特征明显的构造-岩浆岩带。在分析区内地层、构造、岩浆岩及接触带等控矿因素与成矿的关系的基础上,建立了找矿标志;根据区内的成矿特征,初步认为卡尔却卡多金属矿床为斑岩型矿床成矿系列,有斑岩型、夕卡岩型和蚀变岩型3种成因类型,形成斑岩-夕卡岩-热液成矿系统,成矿作用均与中-晚三叠世底侵事件有关。     

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).     

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     

ENGINEERING GEOLOGY

正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.)