刚果(金)科卢韦齐铜矿地质特征及成矿机理浅析

刚果(金)科卢韦齐铜矿位于世界第三大铜矿带中非刚果(金)-赞比亚巨型铜钴成矿带的北西部.矿体赋存在加丹加岩系的罗安群R2矿山组石英质白云岩、白云质片岩及硅质页岩中.通过对区域地质背景、矿床地质特征等分析,认为矿床形成于新元古代,产于裂陷地槽中,矿床早期受地层控制,中期受区域变质及岩浆期后热液改造,晚期受构造热液叠加及次...     

赞比亚罗恩(ROAN)铜矿床地质特征及找矿标志

罗恩铜矿床产于中南部非洲赞比亚-刚果(金)铜钴成矿带南东端卢安夏盆地的东端,为该成矿带内一个典型的铜矿床,其矿床分布和产状严格受区域构造、地层、岩相古地理条件控制。本文旨在通过对该矿床勘查、开采历史地质资料整理,研究其成矿规律、总结找矿标志,指导卢安夏盆地深边部找矿。经对罗恩铜矿床矿体就位空间、容矿岩石、控矿构造、矿化富集规律、矿化分带等特征的研究总结,建立了罗恩-穆利亚希盆地地质矿体模型,指出矿床位于盆地东南部紧窄部位,矿体定位于沉积建造盆内的下罗恩亚群RL6地层泥质板岩和白云质片岩中,明显受后期构造变形作用影响,含矿地层与褶皱同步褶曲、折叠形成厚大矿体,"盆"、"层"、"相"、"位"、"带"为该矿床的找矿标志。     

滇西北烂泥塘斑岩铜矿床原生晕异常结构研究

烂泥塘矿床是云南香格里拉地区典型的斑岩型铜矿床,主矿体产于在地表以下300～500米,地表矿化带仅见脉状铜矿体和铜矿化体.为研究云南香格里拉烂泥塘斑岩铜矿床的原生晕异常结构,本文以异常结构模式理论和方法为基础,对矿床地表和坑道岩矿石样品开展了元素组合、异常特征和水平分带规律研究.结果表明,烂泥塘铜矿床地球化学系统的结构...     

广东省新兴县都斛铜矿床地质特征与找矿潜力

广东省新兴县都斛铜矿床处于吴川—四会深大断裂的中部边缘带,其铜成矿活动主要受本区燕山期斑岩体和NE向断裂构造双重控制,已发现的脉状铜矿体产状各异,在空间上整体形成一个不规则的环状,单个矿体呈细脉分布在黑云母二长花岗岩中,并具有浸染状矿化分布在花岗闪长斑岩等斑岩型矿床的矿化特征。通过对该矿床成矿地质特征的综合研究,对比粤西地区及国内类似斑岩型矿床的找矿经验,认为都斛铜矿床具有斑岩型矿床地质特征,处于斑岩矿床外围或顶部的脉状矿体带,具有寻找斑岩铜矿的潜力。     

新疆卡拉玛铜矿床成矿特征及找矿预测

通过对矿床矿化特征及控矿因素的研究，表明瞳拉玛铜矿床属沉积热液改造型层控矿床。本文在总结成矿规律的基础上，对找矿靶位进行了预测。     

云南老新街铜矿床地质特征及成因探讨

龙脖河铜矿带老新街铜矿床位于红河断裂与阿龙古－龙山断裂夹持的红河裂陷槽中。矿体呈层状、似太产出,受层位、岩性和构造控制。 蚀变发育,硅化、黄铁矿化、绿泥石化与矿化关系密切,根据老新街铜矿床的地质特征,探讨了成矿物质来 成矿机制,指出了矿床属于火山沉积－热液叠加改造型层控矿床。     

安徽大团山层状铜矿床地质特征及成因探讨

大团山层状铜矿床位于铜陵狮子山矿田内,矿体主要呈透镜状、似层状赋存于三叠系殷坑组地层中,与矿化有关的岩浆岩为燕山中晚期石英闪长岩。在前人研究工作的基础上,试图通过大团山层状矿床的矿床地质特征、矿石矿物稀土元素组成和硫同位素示踪研究,深入探讨大团山层状铜矿的成因。     

山西省刁泉银铜矿床地质特征及成因机制

刁泉大型银铜矿床产于由黑云母石英二长岩、花岗斑岩、石英斑岩等组成的复式岩体的夕卡岩带中,矿化呈环带状展布。矿体严格受火山口构造控制。由银铜矿的地质特征、矿物组成、微量元素、稳定同位素、包裹体地球化学特征等研究表明刁泉银铜矿是与次火山岩体有关的夕卡岩型银铜矿床。     

俄罗斯乌多坎砂岩型铜矿的成矿特征与找矿标志

乌多坎砂岩型铜矿是世界知名的超大型砂岩型铜矿之一。总结了该矿床形成的区域地质背景和矿床地质特征,建立了乌多坎砂岩型铜矿的找矿模型与找矿标志,对比了乌多坎砂岩型铜矿床与世界主要著名砂岩型铜矿床的特征,分析了它们之间成矿及赋矿的共同点。结果表明,世界著名的大型-超大型砂岩型铜矿均形成于后造山盆地或地台边缘的盆地(坳陷)中;矿体的规模与形态取决于岩性-岩相条件;矿化类型均具有Cu-Ag矿化特征;均具有干旱的古气候条件及滨海相、三角洲相、海湾-泻湖相的岩相-古地理环境。     

吉林大横路钴铜矿床钴元素地球化学特征及矿床成因

吉林大横路钴铜矿床是90年代初发现的大型钴铜矿床，矿体受大横路复式向斜控制，呈层状似层状或鞍状产出，通过研究钴元素的地球化学特征及赋存状态，表明矿床中的钴元素主要分布在矿区大粟子组岩层中，并以独立矿物，类质同象等形式存在，结合矿床地质特征，研究了钴铜矿床中钴元素的地球化学行为，对探讨矿床成因和指导找矿有重要意义。     

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.     

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.     

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.     

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