加拿大拉布拉多铁矿类型与勘查模型

对拉布拉多铁矿的产出地质环境、铁矿类型及特征、矿床分布和勘查等情况进行研究,认为拉布拉多铁矿勘查和开采主要集中在"拉布拉多地槽"的拉布拉多城—Wabush和Schefferville两个区域。矿床赋存于下元古界Kaniapiskau群Sokoman组内,铁矿类型有高品位表生矿型、变质的粗粒的含铁建造型和弱变质的含铁建造或铁燧岩型,Julienne湖铁矿床为区域上Superior型含铁建造的典型代表,据其成矿条件和成矿特征建立区域上的同种类型铁矿床的勘查找矿模型。     

新疆西昆仑塔什库尔干地区“帕米尔式”磁铁矿床地质特征及成因分析

通过对"帕米尔式"铁矿床的野外地质调查及成矿地质背景、矿床地质特征、矿床地球化学特征、成矿机制和找矿标志进行研究分析,发现该类型铁矿床的铁矿体矿体主要呈层状、似层状、透镜状赋存于下古生界马尔洋组的含铁岩系中,与围岩呈整合接触、互层产出,原生沉积层理清晰,沉积构造特征明显,矿石局部具热液、变质作用改造特征;并具有较为独特的膏铁建造特征,同时稀土元素分析结果表明,"帕米尔式"铁矿床具有海洋化学沉积特征,且与海底中基型火山活动密切相关,为一种新型的铁矿床。     

山西省狐姑山BIF铁矿三维空间分布规律及深部预测

狐姑山铁矿是吕梁地区一个大型BIF铁矿床,该矿床成矿经历多期次构造-变形-岩浆活动,矿体形态极其复杂且空间分布不清,阻碍了深边部找矿效果。在系统的野外地质调查、矿石显微组构分析的基础上,进一步采用三维建模软件构建了狐姑山地层、矿体、断裂、岩浆岩等控矿要素的三维空间模型,结果显示：(1)铁矿主要受袁家村组地层与区域变质作用控制;(2)矿体形成后主要经历了EW向与近SN向的挤压构造应力作用,产生了褶皱变形,形成了连续平行分布的凹凸体,其垂向变形最大幅度达220 m;(3)成矿后的断裂错断矿体且断距较小,基性岩脉对矿体具有明显的破坏作用;(4)深部矿体倾角逐渐变缓,典型勘探线剖面高精度磁测与大地电磁测深结果显示深部异常体连续且有稳定延伸。综合矿床地质特征、三维空间分布、磁化率及电阻率异常特征认为,狐姑山矿床深边部均具有较大的找矿前景,并圈定了3个找矿靶区。     

冀东沉积变质型铁矿成矿规律及找矿方向北大核心CSCD

铁矿是重要的大宗金属矿产资源,冀东地区作为我国重要的钢铁基地面临着后备资源不足的问题,亟待深入开展冀东地区铁矿成矿规律和找矿方向研究。本文在近年来冀东地区找矿实践的基础上,利用勘查区找矿预测理论方法体系,系统归纳冀东铁矿床特征,共划分5个成矿区带,分析了本区鞍山式沉积变质型铁矿含铁建造、变质变形空间分带规律及控矿构造特征,并总结该地区矿床成矿规律。提出滦县滦南铁矿成矿区带成矿构造受背形和断裂构造共同控制的观点,指出冀东地区“就矿找矿”预测要素可简化为矿体控制程度和地球物理标志两大类。认为冀东铁矿地质工作程度高,进一步找矿的2个主要方向:一是已有大中型矿山深部和外围“就矿找矿”,预测其仍有较大资源潜力;二是迁安铁矿成矿区带第三层硅铁建造,属新发现的成矿空间,具有重要的找矿意义。     

宁夏卫宁北山地区照壁山铁矿床地质特征及成矿规律探讨

卫宁北山地区铁矿床主要赋存于泥盆—石炭系碎屑岩建造中,矿床产出主要受地层建造和构造控制。根据成矿地质背景、矿物组合及围岩蚀变等特征分析,该区铁矿床成因类型应属于中-低温热液型。照壁山铁矿床在该区域的铁矿床中,储量较大,矿体数量较多,成矿背景、矿床成因均具有代表性,其研究对揭示该区铁矿床成矿地质特征、进行铁矿床综合研究、建立成矿模型及总结成矿规律具有十分重要的意义。     

鄂东鸡笼山金铜矿床成矿地质特征及找矿前景分析

鸡笼山金铜矿是长江中下游成矿带上一个具有代表性的大型全铜共生矿床,其成矿受地层、岩浆岩和构造联合控制,成矿过程中北北西向张扭性断裂构造多次活动,为矿床叠加富集成矿作用提供了条件,热液叠加富集成矿特征明显.工业矿体主要赋存在岩体与大冶群第五、第六岩性段组成的接触带中及其附近.文章在分析总结矿床成矿控制因素基础上,对矿区深部及外围进行了找矿预测,为下步接替资源勘查提出了有利找矿靶区.     

云南景洪国防前寒武纪变质含铁建造及铁矿床成因

云南景洪自治州国防地区前寒武纪变质含铁建造位于滇藏地槽区澜沧江变质带的东南部。该建造属于前寒武系澜沧群“国防组”。该组由一套变质的泥砂质沉积岩夹变质的中基性海底火山喷发岩系组成,在区域呈北东方向分布。国防铁矿床产于该组变质火山岩段内。矿床形成与火山喷发作用密切相关,受火山机制控制。矿床具有多种成因类型且呈组合形式出现,在经受区域变质作用后,又有变质热液和混合岩化热液脉状铁矿床迭加其上。因此对这一矿床组合进行综合研究,不论是对成矿理论研究,还是对指导找矿勘探实践都有重要意义。本文从含矿原岩建造和矿床特征出发,对各类矿床形成条件及多种成矿作用相互关系进行讨论。     

新疆塔什库尔干陆块乔普卡里莫磁铁矿床地质特征及成因浅析

通过综合分析区域地质、遥感、物化探等多源信息背景,结合乔普卡里莫磁铁矿床地质特征、磁异常特征、矿体形态特征、矿石结构构造、矿物组合分析,表明该区内含铁建造布伦阔勒岩群的形成时代为早古生代;铁矿床主要赋存于布伦阔勒岩群黑云石英片岩岩性段内,矿床成因类型为海相火山沉积型磁铁矿矿床,后期受到一定的区域变质作用的叠加改造。提出应加强该区基础地质成矿问题及成矿规律研究,对于指导该区域内同类型磁铁矿床的找矿工作都具有重要的参考意义。     

甘肃银硐梁锑矿床地质特征及控矿因素分析

近些年来,在西秦岭锑成矿带中发现了中型规模的甘肃银硐梁锑矿床。通过论述该锑矿床的地质特征,分析并讨论该矿床的控矿因素及找矿标志。结果表明: 该锑矿床主要赋存于三叠纪官亭群中部建造层第二岩性段、钙质硅化石英砂岩夹泥质粉砂岩的断层破碎带和层间破碎带中; 锑矿化明显受地层和断裂破碎带控制,为成矿提供成矿物质、热液条件和赋存空间,较早形成的NW向断裂是导矿构造,较晚形成的NE向次级断裂是赋矿构造; 成矿物质主要来源于地层,成矿热动力主要来源于构造运动,成矿作用以热液充填为主; 银硐梁锑矿床属于低温热液裂隙充填型层控矿床。     

新疆西天山松湖铁矿床叠加成矿过程——来自矿床地质和矿物地球化学的约束

松湖铁矿床是新疆西天山阿吾拉勒铁成矿带中的典型中型铁矿床,该矿床铁矿石资源量5506万吨,矿体品位22%~54%,平均品位42%。本文对松湖铁矿床进行了矿床地质和矿物地球化学特征研究,查明了蚀变和矿化特征,划分了矿石类型以及成矿期和成矿阶段,探讨了矿床的形成过程。对松湖铁矿区围岩蚀变分带特征进行了仔细的划分,根据矿物相互穿插关系以及矿物组合和结构构造特征,将成矿过程分为3个成矿期6个成矿阶段。矿浆期成矿温度500~650℃,而热液期成矿温度为接近400℃,蚀变矿物绿泥石的形成温度平均为312℃。两种成因类型磁铁矿稀土元素特征具有专属性,矿浆期磁铁矿ΣREE值明显高于火山热液期磁铁矿,表明热液演化过程中稀土元素分馏程度较高。耦合矿床地质和矿物地球化学特征,初步判断新疆松湖铁矿为矿浆-火山热液叠加型铁矿床。     

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