甘肃北山某黑钨矿床地质特征及成矿规律的初步认识

前言北山某黑钨矿区,位于天山—内蒙地槽褶皱系,北山华力西褶皱带,白山—狼娃山复背斜西段南缘。单脉型石英脉黑钨矿床和云英岩型浸染状黑钨矿床(简称脉钨矿和云英岩型矿床)的生成,在构造上严格受矿区南北两侧近东西向区域性白山—狼娃山压扭性深大断裂所派生的北东向扭张性断裂所制约。北东向断裂为主要容矿空间,近东西向和北西向断裂充填有少数矿脉(图1)。     

柞-山矿集区侵入岩与成矿

柞-山矿集区处于商丹断裂与凤镇-山阳断裂之间,构造位置属南秦岭华力西褶皱带,为西秦岭泥盆系主要热水沉积盆地之一(图1).在华力西期发育近东西向断裂带内,沉积了泥盆—石炭系.柞(水)-山(阳)沉积盆地控制了该矿集区的形成,次级近东西向顺层断裂和含矿层复合控制了矿带的分布.     

云南富宁冒街金矿东矿段成矿地质条件

冒街金矿属构造角砾岩、碎裂岩(卡林)微细粒浸染型.受富宁大断裂和里达大断裂影响,近东西向组及北西西向组断裂为基性岩体的侵入和矿液的运移提供通道.矿床成因类型为地下热(卤)水溶滤型金矿床.     

四川攀西螺髻山第四纪冰川作用遗迹与冰期系列

螺髻山是我国最东一个有多次古冰川作用而无现代冰川作用的山地,是研究我国东部第四纪冰期历史的理想场所。 螺髻山位于川西山地南部,凉山州首府西昌以南10km处,是一个南北长约80km,东西宽约30km的山脉单一的山地,主峰海拔4359m,比邻近山地如贡嘎山、玉龙山、牦牛山山地的现代雪线高度(4900—5000m)要低近500—600m。 螺髻山西临安宁河断陷谷地(海拔1200m),相对高差3150m左右;东邻邛海普格断裂谷地(海拔1500m左右),相对高差2800m左右。组成螺髻山的岩石主要是震旦系列古六砂岩、白云质灰岩、凝灰岩等,走向多近南北向和北西向,主要断裂方向也大致如此。     

内蒙东七一山花岗岩型铷矿床地质特征

(一)区域地质特征 1.岩体产出的地质条件: 岩体位于阴山—天山纬向构造带,北山地区的旱山—凤尾山—小尘包山字型构造前弧东侧。在这里,近东西向展布的向西倾伏的背斜及切断背斜南翼的北东东向弧形大断裂与次一级北西向断裂交汇构成复杂的构造带。构造带内岩浆岩发育,含铷花岗岩位于北东东向弧形大断裂北侧,即北东东向弧形大断裂与次一级北西向断裂交汇处。区内发育有北西向压扭性和北东向张扭性两组小断裂,以及一组近南北向追踪断裂。前两组小断裂构成棋盘格子构造。小断裂中均充填有萤石矿脉和髓石—萤石矿脉,形成萤     

西藏拉琼锑金矿床流体包裹体特征及地质意义

正拉琼锑金矿床位于措美县西约17 km,大地构造位于青藏高原南部的特提斯喜马拉雅构造带东段,地处于印度河—雅鲁藏布江缝合带(IYZS)与藏南拆离系(STDS)大断裂之间。由于印度板块与欧亚板块碰撞之后,导致印度洋持续扩张,造成印度大陆不断向北挤压,形成喜马拉雅造山带(尹安,2000),该地区近东西向的断裂自北而南依次     

四川石棉县草科乡大热水温泉成因探讨

四川省石棉县以北的磨西断裂两侧温泉出露较多,温泉直接或间接受摩西断裂控制。在综合分析前人资料的基础上,从区域构造的角度进行研究,认为草科乡温泉属于间接受磨西断裂控制。草科乡大热水温泉的补给区位于温泉出露位置南侧山区,补给区海拔高程2673m。大热水温泉的补给区位于南侧山区,受到侵入岩接触带与SN向的断层或节理裂隙密集带的影响,地下水向南运移,并在排泄区受控于草科断裂而出露于地表;其中SN向的断层或节理裂隙密集带受摩西断裂控制。本次研究的成果的意义在于摸清草科乡温泉的成因模式,对于后期温泉的开发提供理论支撑。     

内蒙古自治区阿巴嘎旗必鲁甘干铜钼矿地质特征及成因探讨

必鲁甘干矿区位于天山—阴山内蒙地槽华力西晚期褶皱带阿巴嘎旗复向斜中段,查干敖包(必鲁甘干)倒转背斜核部。区内NE向断裂构造控制了印支期花岗斑岩体及特大型斑岩型铜钼矿床的分布。通过勘探查明主矿体延长2 300m,延深1 850m,平均厚度46.24m。铜钼矿赋存于花岗斑岩与硅质角岩内外接触带,赋矿岩石主要为花岗斑岩和硅质角岩。矿体形态以透镜状—似层状为主,属斑岩型铜钼矿。     

苏南东部及上海地区的北西向断层

笔者对苏南东部及上海地区的北西向断层作了系统的野外观察,并对断裂带内构造岩作了详细地研究;对北西向断层的力学性质、构造地质特征及地质意义作了初步探讨。现介绍如下,如有不当,敬请指正。一、北西向断层的野外观察 (一)太湖大东岛,石炭系灰岩中发育了三条北西向压性断裂(图1、2),间隔40～50m。其中断层A走向北30°西,倾向北东,倾角75°;断裂带宽度为7m。断层B走向北35°西,倾向南西,倾角70°;断裂带宽度为8m。断裂C走向北35°西,断面近直立;断裂     

鄂东南徐家山金矿田成因研究

鄂东南徐家山金矿田产于志留系(含碳)碎屑岩地层中。矿田内断裂构造发育，可分为近东西向、北东向、北西向和近南北向4组。近东西向断裂是区域构造的基础，是主要的导矿构造；北东向和北西向断裂控制了晚期岩脉及金矿体的分布，也是主要的储矿构造。主成矿期的流体为低—中等盐度、低密度流体，属酸性、弱还原环境，成矿压力为44．270一47．948MPa，属地壳浅层次成矿。矿区内与成矿有关的石英包裹体中的水均属大气降水(地下水)，岩浆活动提供了部分矿质和热源。矿田内的金矿床为中低温热液型金矿床。     

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.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)