紫金山矿床露采铜矿石贮存原因初探

紫金山矿床露采高品位铜矿石揭露区位于F1-4断裂构造与隐爆角砾岩和英安玢岩呈脉状出露地表交会部位的东北部高山区域,通过对紫金山铜金矿床氧化特征及其氧化带发育影响因素、F1-4断裂构造富(导)水特征、隐爆角砾岩和英安玢岩出露地表形态特征等的调查分析研究,提出不均一氧化是矿区露采东北部高山区域仍保留有大量高品位铜矿石的主要原因。     

黑龙江金厂J-1号金矿体地质特征及深部预测

黑龙江东宁金厂金矿床是与印支-燕山期中酸性火山-次火山岩有关的大型金矿床，矿化类型主要有隐爆角砾岩型，多金属硫化物细脉充填型及破碎蚀变岩型，矿体主要受隐爆角砾岩筒，环状，放射状构造控制，筒状角砾岩型金矿的资源量占全区的80%以上。矿区内最主要的J-1号金矿体矿化类型为隐爆角砾岩型。品位高且稳定，在系统总结该矿体地质特征的基础上，对其深部远景进行了预测。     

东准噶尔成矿带岩浆隐蔽爆破作用与成矿

新疆东准噶尔地区乌伦布拉克铜矿、老山口铜—铁—金矿两地皆存在花岗质岩浆隐蔽爆破作用。前者形成了与潜火山英安玢岩侵入体密切伴生的英安玢岩质隐爆角砾岩,后者形成了与潜火山闪长玢岩侵入体相伴生的闪长玢岩质隐爆角砾岩和闪斜煌斑岩质隐爆角砾岩。岩浆隐蔽爆破作用是伴随该区华力西中晚期—晚期地槽褶皱造山运动而发生的一种超浅成岩浆作用,其与铜、金等金属成矿的关系密切;与其有关形成了隐爆角砾岩筒型铜(金)矿和破碎带蚀变岩型金矿。两种类型的矿床都显示出广阔的找矿前景。     

下坂金矿床地质特征及找矿预测

下坂金矿床位于闽中金矿带,是产于侏罗系火山岩展布区,与次火山岩有关的浅成低温热液型金矿床。金矿体主要产于流纹斑岩的边缘条带相及与之毗邻的隐爆角砾岩中。矿石的矿物组成简单,属少硫化物型矿石,黄铁矿为主要载金矿物,与金矿化有关的热液蚀变作用是硅化、绢云母化和黄铁矿化。矿化富集与流纹斑岩的边缘条带相隐爆角砾岩、硅帽及裂隙发育程度关系密切。     

福建上杭紫金山次火山热液铜金矿床地质特征初探

紫金山铜金矿床是福建新发现的一个新的矿床类型。矿区主要为—燕山期复式花岗岩体分布,其中燕山晚期的英安玢岩及其相伴的隐爆角砾岩含铜金矿,目前已圈出四个矿化带。矿石矿物以蓝辉铜矿、硫砷铜矿为主。矿化具垂直分带,上部以蓝辉铜矿为主,标高580—400米间以硫砷铜矿为主。400米以下以黄铜矿为主。在潜水面之上及其附近,因铜硫矿物经氧化流失使金相对富集成矿。作者认为。该矿床的形成与燕山晚期次火山热液活动有关。成矿物质主要来源于深部,并提出成矿模式。     

东准噶尔成矿岩岩浆隐蔽爆破作用与成矿

新疆东准噶尔地区乌伦布拉克铜矿、老山口铜－铁－金矿两地皆存在花岗质岩浆隐蔽爆破作用。前者形成了与潜火山英分玢岩侵入体密切伴生的英安玢岩质隐爆角砾岩,后者形成了与潜火山闪长玢岩侵入体相伴生的闪长玢岩质隐爆角夺和闪斜煌斑岩质隐爆角砾岩。岩浆隐蔽爆破作用是伴随该区华力西中晚期－晚期地槽褶皱造山运动而发生的一种超浅成岩浆作用,基与铜、金等金属成矿的关系密切;与其有关形成了隐爆角筒型铜（金）矿和破碎带蚀变岩     

黑龙江金厂金矿区火山构造及其控矿特征

金厂矿区化类型主要有隐爆角砾岩型、构造蚀变岩型和黄铁矿及多金属硫化物细脉充填型，与其相对应的容矿构造分别为隐爆角砾岩筒，断裂和环状、放射状断裂。其中隐爆角砾岩筒和环状、放射状断裂是印支期花岗岩和燕山中－晚期闪长玢岩岩浆活动时伴生的火山－次火山构造,岩浆期后含矿热液充填其中并发生蚀变交代，形成了隐爆角砾岩型矿体及由黄铁矿－石英脉和多金属硫化物－石英脉充填的环状、放射状矿体。     

山东平邑归来庄金矿床岩浆演化与成矿物理化学条件

介绍了归来庄金矿床次火山岩的岩浆演化特征,并对隐爆角砾岩带的特征和隐爆机制以及碲金型金矿形成的物理化学条件进行了探讨,研究表明归来庄金矿床是与碱性次火山岩有关,并受隐爆角砾岩控制的碲金型浅成热液金矿床。     

紫金山矿田二庙沟铜多金属矿点隐爆角砾岩活动中心的厘定及意义

紫金山矿田隐爆角砾岩发育,矿床与隐爆角砾岩有着紧密的关系。二庙沟矿区位于紫金山矿田西部,区内隐爆角砾岩零星出露。本文以二庙沟金子湖旁的隐爆震碎角砾岩为主要研究对象,通过隐爆角砾岩的分布特征、二庙沟金子湖旁周边的矿物蚀变组合特征及金子湖周边裂隙的特征分析,提出二庙沟矿区内金子湖附近为火山机构及隐爆角砾岩活动中心。该隐爆角砾岩中心的厘定,对该矿找矿勘查有一定的指导意义。     

江西洋鸡山金矿矿相学研究

江西洋鸡山金矿矿相学研究楼亚儿（中国地质大学，北京１０００８３）关键词洋鸡山金矿，矿相学，矿物标型特征，隐爆角砾岩江西瑞昌洋鸡山金矿为长江中下游钢－金矿田中一个典型的独立金矿床。矿体赋存在燕山早期石英闪长玢岩与五通组地层接触带附近的隐爆角砾岩筒中，矿...     

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