湘黔汞矿带相关成矿问题的讨论

湘黔汞矿带的含汞建造与生油层系的特征相似,汞矿床的形成和油气的聚集一样具有“生、储、盖”的成矿地质条件。中寒武统敖溪组及下寒武统清虚洞组既是汞矿的容矿层,也是汞矿的矿源层。汞的成矿流体是一种以地下水为主、包括油气在内的混合热液,成矿作用是在低温低压高盐度的还原环境中进行的,属于沉积成岩－地下水热液的成因类型。     

黔东地区金属成矿与油气成藏关系

黔东地区下古生界清虚洞组、熬溪组、杨家湾组和红花园组,既是Hg、Sb、Au、Pb、Zn金属矿床的容矿层位,也是中国南方著名的古油藏或残余油气藏的储集层,两者间存在着密切的空间关系和成因联系。金属矿床和古油藏的产状基本一致,均赋存于灰岩和白云岩的缝隙、孔洞和晶间。垂向上,普遍存在上油下矿的规律,即从层位上讲,古油藏(现今为沥青)储集层位于古油水界面之上,金属矿床位于古油水界面之下。牛角塘观家坡矿段清虚洞组闪锌矿见到黄棕色有机质包体。三丹汞矿带天银场汞矿中,既可见到沥青呈薄膜状镶边,内见辰砂分布,又可见到沥青再次被辰砂…     

陕西公馆汞锑矿床地球化学特征

本文通过对公馆汞锑矿床的矿体赋存状态，沉积作用的地球化学特征，变质作用的地球化学特征的论述，阐明了该矿床为一特大型层控汞锑矿床，对在本地区碳酸岩地层中建筑汞锑矿产提出了较可靠的依据，同时也论述了本地区地层不仅是汞锑金属的富集地段，也是铜、铅、锌等多金属的富集地段。     

构造改造成矿机制：——四川羊石坑汞矿成矿作用探讨

羊石坑汞矿床是位于四川省秀山县境内的大型汞矿床，产于下寒武统清虚洞组碳酸盐岩中，受地层和构造双重控制，并以细脉浸染型为特征而区别于我国其他大型汞矿床。概括了该矿产出的区域地质背景、物质来源和构造控矿特征，通过对不同构造部位矿物、元素及同位素等的分布、分配特征和矿床地质地球化学研究，揭示了成矿物质来自沉积地层，矿源层的形成与同生断裂活动和深部物质加入有关，构造－热液活动对矿源层的改造导致了矿床形成，     

辽东地区铅锌铜矿床中几种少见金属矿物的初步研究

笔者在研究辽东地区铅锌铜隐伏矿床过程中,发现了几种少见的金属矿物(硫铋铜矿,银锑黝铜矿,硫铜钴矿)。经初步研究现简述如下: 1 矿物空间分布几种少见金属矿物在区内分布较普遍,限于工作程度关系,初步查定这些矿物产出于石湖沟、正沟门、盘岭等地(表l)。银锑黝铜矿比云南的含银量高155倍,为国内少见的含银高的银锑黝铜矿。表3银锑黝铜矿电子探针分析     

我国一些铜镍硫化物矿床主要金属矿物的特征

镍、铜共生的铜镍硫化物矿床是镍矿也是铜矿的重要矿床类型。磁黄铁矿，镍黄铁矿、黄铜矿是这类矿床的主要金属矿物。它们的某些矿物学特征，特别是微量元素Ｃｏ／Ｎｉ比值，与其他铜矿类型明显不同，这三种矿物组成不同于任何其他铜矿类型的典型矿物共生组合， 形成特殊的海绵损铁状、球滴状构造。     

云南昌宁县耈街锑多金属矿地质特征及找矿远景

昌宁县耈街锑多金属矿矿体赋存于三叠系上统三合洞组(T₃sh)与麦初箐组(T₃m)构造接触带,呈似层状、透镜状顺层产出。矿床受地层、岩性、构造控制,属中低温构造热液成矿。矿区内铜、金、锑土壤地球化学异常明显,赋矿层位三合洞组(T₃sh)分布较广,已发现了一定规模的铜、锑矿(化)体,显示了较好的找矿远景。     

西藏亚贵拉多金属矿床地质特征

近年来,重要的斑岩铜矿--冈底斯大型斑岩铜矿带被发现(侯增谦等,2001;李光明等,2004;芮宗瑶等,2006)以来,在其北部的念青唐古拉成矿带相继发现了多处大型铅-锌多金属矿床,代表性矿床有拉屋铜多金属矿、勒青拉铜多金属矿、尤卡朗银多金属矿、亚贵拉多金属矿和洞中松多银多金属矿等.其中亚贵拉多金属矿是河南地质调查院新发现的一个超大型矿床.     

瞬变电磁法在云南的应用效果

本文介绍了瞬变电磁法在云南找矿上的应用效果，在锡多金属矿，铜矿，铅锌矿上的应用结果，说明瞬变电磁法对锡多金属矿、砂岩铜矿、昆阳群落雪组白云岩型铜矿，越南生权式铜矿，铅锌矿的寻找是有效的，对平缓产状地层，可解决地层分层问题，该方法亦可确定和追索断层。     

贵州白马洞铀矿床深断裂、层间滑脱构造体系对铀成矿控制及找矿潜力分析

白马洞铀汞钼多金属矿床位于黔北隆起区之凤冈南北向隔槽式褶皱变形区西南部部断裂构造与热点复合部位。东西向白马洞深大断裂带控制黔中地区热液铀多金属矿分布。白马洞断裂上盘发育多层次层间构造滑脱体系。铀多金属矿带分布在北东向犀牛洞断裂与东西向白马洞断裂斜接复合部位。铀汞钼矿体赋存于寒武系高台组页岩上下盘层间构造破碎带中。矿床内热液活动明显,蚀变强烈,蚀变种类多,以硅化、黑色蚀变为主,矿物成分复杂。预测深部震旦系灯影组底部与顶部及南沱组与清水江组之间发育层间构造破碎带,可能有铀、汞、钼多金属矿体赋存与富集。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

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