云南普朗斑岩铜矿床地质特征

普朗斑岩铜矿地处甘孜-理塘结合带西侧德格-中甸陆块东缘,印支期义敦-中甸岛弧带南段。矿区地层为上三叠统图姆沟组,主要出露普朗印支期复式中酸性斑(玢)岩体,构造裂隙发育,岩石蚀变强烈,具典型的“斑岩型”蚀变分带:由中心向外依次为强硅化带→硅化钾化带→绢英岩化带→青磐岩化带。岩浆岩、岩浆侵位的地层、热液蚀变作用、热液运移和矿质沉淀的构造空间控制了本矿床的产出。其成矿作用发生于普朗复式斑岩体内,矿化与蚀变相伴进行,在岩体中心形成由细脉浸染状矿石组成的筒状矿体,岩体边部产出脉状矿体。成矿元素以铜为主,伴有金、银、钼、钯、硫等多种有用组分。矿床规模达到超大型。     

江西省马塘地区找矿方向分析

江西马塘地区的花岗岩质硅化破碎带中发育孔雀石化黄铜矿化蚀变石英闪长玢岩、黄铜黄铁矿化次生石英岩,构造带两侧见有多处脉状花岗岩、花岗斑岩出露。推测铜矿化与深部的隐伏斑岩体关系密切;地表显示为花岗岩质硅化破碎带中的裂隙充填型细脉浸染状矿化,深部可能赋存有斑岩型工业铜矿体。本区是寻找隐伏斑岩型铜矿床的有利地区。     

青海小赛什腾铜矿地质特征及找矿前景

小赛什腾铜矿受控于加里东期花岗闪长斑岩及细粒闪长岩体,在岩体内部的构造裂隙系统中发育钾长石化、硅化、绢云母化、绿泥石化、碳酸盐化等围岩蚀变,矿体主要赋存在钾长石硅化带内;共有3个铜矿体,矿化以铜为主,伴有金钼矿化;矿石类型主要为细脉状、细脉浸染状及浸染状.矿床具有斑岩型矿床的特征,预测可达中型规模.     

青海小赛什腾铜矿地质特征及找矿前景

小赛什腾铜矿受控于加里东期花岗闪长斑岩及细粒闪长岩体，在岩体内部的构造裂隙系统中发育钾长石化、硅化、绢云母化、绿泥石化、碳酸盐化等围岩蚀变，矿体主要赋存在钾长石硅化带内；共有3个铜矿体，矿化以铜为主，伴有金钼矿化；矿石类型主要为细脉状、细脉浸染状及浸染状。矿床具有斑岩型矿床的特征，预测可达中型规模。     

大别山北麓姚冲钼矿床地质特征及找矿标志

河南省新县姚冲钼矿床是大别山北麓新发现的又一典型的斑岩型钼矿床,目前控制规模为中型。矿体主要赋存于花岗斑岩体(脉)外接触带(中元古界蚀变片麻岩),受隐伏岩体和构造控制。辉钼矿化呈浸染状、细脉-网脉状、薄膜状和角砾状产出。围岩蚀变主要有硅化、钾长石化、黄铁矿化、绢云母化、绿泥石化、绿帘石化、方解石化、萤石化和高岭土化等,具典型斑岩型钼矿床的矿化和围岩蚀变特征。其中硅化和钾长石化与钼成矿关系密切。矿床蚀变分带明显,由中心向外侧依次为钾长石化-硅化带(强蚀变带)、硅化-绢英岩化带(弱蚀变带)、硅化-青磐岩化带,由中心向外围蚀变强度逐渐变弱。蚀变作用的强弱与钼矿体的品位高低相对应,硅化和钾化为该区最直接的找矿标志之一。     

香格里拉陆家村银金多金属矿围岩蚀变及矿床成因

矿床具斑岩型铜矿化蚀变特征,从岩体中心向外,蚀变呈环带状分带发育,依次为强硅化带→钾硅化带→绢英岩化带→青磐岩化带。矿化在浅部表现为断裂破碎带控制的热液脉型Cu、Au、Pb、Ag矿床,深部则为斑岩型Cu、Mo矿床。     

云南香格里拉春都斑岩铜矿区围岩蚀变及矿化特征

春都斑岩铜矿床地处著名的印支期中甸-义敦岛弧成矿带南端。矿区出露闪长玢岩-花岗闪长斑岩复式岩体,成矿岩体为印支晚期的花岗闪长斑岩。围绕成矿岩体,围岩蚀变强烈,蚀变分带明显,由中心向外,依次出现硅化钾化带→绢英岩化带→硅化带→硅化黑云母化带→青磐岩化带→绢云母化及泥化带。区内蚀变与矿化关系密切,蚀变类型决定矿化程度,蚀变...     

初论云南易门地区凤山铜矿床刺穿构造岩-岩相分带模式

以云南易门式凤山铜矿床为例,应用刺穿构造岩-岩相学填图方法,解剖了控矿刺穿体的识别标志、物质组成、类型、内部结构、构造岩分带等特征。通过控矿刺穿体与非控矿刺穿体的对比研究,建立了控矿刺穿体的构造岩-岩相分带模式：从构造刺穿体→灰白色硅化白云岩→青灰色白云岩,依次出现刺穿体岩相带和构造蚀变岩相带,即火山角砾岩相带→含火山岩、板岩角砾岩相带→强铜矿化灰白色硅化白云质碎裂岩相带→铜矿化碎裂白云岩相带→弱硅化白云岩相带。其中强铜矿化硅化白云质碎裂岩相带、铜矿化硅化碎裂白云岩相带是矿体的主要赋存部位。金属硫化物矿物组合与矿石构造亦呈现水平分带规律：黄铜矿+斑铜矿(少)组合,块状、网脉状构造→黄铜矿+斑铜矿+辉铜矿(少)组合,稠密浸染状、脉状构造→黄铜矿+黄铁矿+斑铜矿(少)组合,细脉状、稀疏浸染状、星点状构造。     

青海小赛什腾斑岩型铜矿地质特征及成因探讨

小赛什腾铜矿赋存于华里西期闪长岩、闪长斑岩中,全岩矿化,岩体普遍含铜,岩体中w(Cu)平均值＞500×10-6;铜矿体主要由含铜闪长斑岩、闪长岩等组成,矿石呈中细粒状、斑状结构,细脉浸染状、块状构造;矿体、矿化体与围岩逐渐过渡,界线不清,整个岩体中普遍可见弱孔雀石化.化探异常在平面上由岩体中心到围岩存在明显的元素分带现象,即,W,Mo,(Bi)→Cu,Au→As,(Hg),表现出与典型斑岩型铜矿相似的地球化学特征.岩体蚀变有硅化、碳酸盐化、绿帘石化、绿泥石化、绢云母化、黄铁矿化,少量钾化,在与大理岩的接触带附近发育夕卡岩化.     

西准包古图呼的合铜矿地质特征、成因及成矿规律研究

新疆西准包古图矿区呼的合铜矿位于巴尔喀什华力西期斑岩成矿带.大地构造位置属哈萨克斯坦-准噶尔板块,唐巴勒-卡拉麦里古生代复合沟孤带,包古图岛弧区.矿床处于达尔布特和克乌深大断裂间,次级NS向与NE向断裂交汇处.Ⅴ号岩体属深源、浅成中酸性复合相岩体.含矿岩石以中粗粒、斑状、似斑状结构的石英闪长岩、花岗闪长斑岩为主,次有花岗闪长岩、花岗斑岩、黑云母花岗闪长岩等,形成时间为320~300 Ma,岩石蚀变强烈,蚀变分带自岩体中心向外构成钾长石和粒状石英核-钾化带-绢英化带-青盤岩化带.金属矿物组合自岩体中心向外变化规律为:(黄铁矿-辉钼矿-黄铜矿)→(黄铁矿-黄铜矿-闪锌矿-辉钼矿)→(黄铁矿-黄铜矿-毒砂-Te-Bi-Ag-Au的矿物).有益元素主要为铜、钼、金、银等元素,矿石类型自岩体中心向外的变化规律为:Mo(Cu)→Cu(Mo)→Cu(Au)→Au.矿石构造为细粒浸染状和细脉浸染状.矿石品位低、矿化均匀,成矿物质主要来自与其共生的岩浆岩,属典型斑岩型铜矿.构造、岩石、蚀变、矿物、及成矿元素在空间、时间上变化规律较强,与矿化富集有密切联系.     

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