西藏蒙亚啊铅锌矿床成矿地质特征

<正>蒙亚啊铅锌矿床是念青唐古拉-冈底斯成矿带门巴-金达铅锌矿铜银钼多金属矿集区之中的典型矿床,构造上隶属于西藏特提斯构造域冈底斯-念青唐古拉地块中南部,冈底斯弧背断裂垄中段中东部。行政区域上隶属西藏自治区嘉黎县绒多乡。唐菊兴等(2009)提到,西藏冈底斯成矿带的成矿地质背景、矿床地质研究和资源潜力评     

冈底斯成矿带斑岩-矽卡岩矿化之耦合关系——以邦铺矿床为例

<正>随着冈底斯成矿带上亚贵拉、甲玛、努日等一系列矿床岩浆成因类型的最终定位(高一鸣等,2009;唐菊兴等,2010;李光明等,2011),冈底斯斑岩-矽卡岩复合型成矿带的轮廓已然开始显现。这其中包括努日-明则斑岩-矽卡岩铜钼钨矿、驱龙斑岩铜(钼)矿及外围知不拉-绒木错拉-朗姆家果矽卡岩铜矿、甲玛隐伏斑岩钼(铜)     

西藏谢通门县斯弄多银多金属矿床中新世花岗斑岩地球化学特征及地质意义

正冈底斯成矿带是青藏高原重要的多金属成矿带,矿产资源丰富,近年来,冈底斯造山带矿产勘查评价工作取得了重大进展,在冈底斯南缘发现了长达350 km,宽40 km的斑岩铜矿带(曲晓明等,2001)。随后,在冈底斯成矿带的北缘发现了较多的以银铅锌矿化为主的矿床,构成了一条与南缘的斑岩铜矿带平行分布的银铅锌多金属成矿带。斯弄多银多金属矿区位于冈底斯成矿带东段,是近年来在冈底斯北缘铅锌成矿带首次发现并确立的典型浅     

西藏邦铺钼(铜)矿床地质特征及年代学研究

西藏邦铺钼(铜)多金属矿床位于西藏特提斯构造域冈底斯—念青唐古拉(地体)板片中南部,是冈底斯斑岩铜矿带东段典型的大型斑岩钼(铜)矿床,共生铅、锌,是继沙让斑岩型钼矿床(秦克章等,2008;唐菊兴等,2009;高一鸣等,2010)之后,冈底斯成矿带发现的又一大型斑岩钼(铜)矿床,与南边驱龙、甲玛构成了青藏高原     

西藏双布结热矽卡岩型铜矿床花岗闪长岩锆石U-Pb年龄及其意义

<正>克鲁-冲木达矽卡岩成矿亚带位于冈底斯—念青唐古拉板片次级构造单元冈底斯火山—岩浆弧的东段南缘,属冈底斯铜多金属成矿带的重要组成部分,双布结热矿区位于冈底斯成矿带东段泽当矿田,地处西藏自治区山南地区乃东县境内,雅鲁藏布江北侧,是典型的矽卡岩型矿床。本文通过野外地质调研、岩相分带以及LA-ICP-MS锆石U-Pb年代学研究,探讨其产出的构造背景,不仅可以深入研究南亚带的成矿机制,同时为研究冈底斯成矿带各亚带的时空关系、冈底斯成矿带与板块俯冲-碰撞构造     

西藏冈底斯南缘构造格架与成矿系统

近年来我国的地质勘查评价工作在西藏冈底斯地区取得了重要的进展，除了初步证实其中的甲马、冲江、厅宫、驱龙等多个斑岩型铜矿床具有大型或超大型矿床的找矿前景外，富铁、富银多金属等矿产在冈底斯也具较大的资源远景，显示出西藏冈底斯成矿带有望成为具有世界级规模的铜、富铁、多金属成矿带。笔者综合近年来在西藏冈底斯地区地质勘查评价工作所取得的新成果，在对西藏冈底斯成矿带的成矿地质背景、成矿条件进行初步分析的基础上，对南冈底斯成矿带成矿系统的主要类型及其特征进行了初步研究，并根据成矿地质条件和已知矿床特征，在冈底斯成矿带中划分出5个铜、富铁、多金属成矿远景区，指出驱龙铜矿、厅宫铜矿、白容铜矿以及恰功富铁矿、洞中松多银多金属矿是冈底斯成矿带进一步勘查评价工作的首选目标。     

西藏蒙亚啊铅锌矿床矿区地质特征及围岩蚀变

<正>蒙亚啊铅锌矿床是西藏巨型冈底斯成矿带东段境内一个重要的铅锌(银)矿床,位于西藏嘉黎县绒多乡南东18 km处。近些年,在西藏冈底斯地区开展的地质调查评价及研究工作中,发现了一批铅锌多金属矿床,显示了冈底斯成矿带优越的成矿地质条件。根据冈底斯成矿带铅锌多金属矿床的地质特征,总结出该区铅锌矿床主要     

西藏措勤县诺仓地区铅锌矿成矿远景初步探讨

<正>西藏冈底斯成矿带作为我国最重要的成矿带之一,一直以来备受地质学者关注,期间取得了丰硕成果。到目前为止找矿取得的成果多数位于冈底斯成矿带东段,矿种丰富,但西段找矿工作进展缓慢,仅发现少量铁矿床,未发现铅锌矿及其他矿床。本文研究区位于西藏措勤县诺仓地区,隶属于冈底斯成矿带西段,海拔平均在5000米以上,到目前为止基础地质及找矿勘察工作仍     

西藏冈底斯西段地区成矿地质条件及找矿方向——以西藏措勤县罗仓地区赤马村为例

<正>西藏冈底斯成矿带是青藏高原腹地内一条与玉龙斑岩铜矿带斜交的重要成矿带。但是目前的找矿进展主要集中于冈底斯中东段,先后发现和评价了多个大中型斑岩型、矽卡岩型、热液型铜(金)、钼、铅锌银多金属矿床(曲晓明等,2001;Fei Guangchun et al.,2013)。但是在冈底斯西部措勤地区,除了发现尼雄铁矿外,目前尚未有其它的找矿新突破。     

西藏诺仓地区锌元素水系沉积物地球化学弱异常信息提取

<正>冈底斯成矿带位于西藏中部,带内地质构造复杂多样,造就了良好的成矿条件,其中铜、金、铅锌、银等优势资源潜力巨大。通过开展化探异常查证,在西藏冈底斯带中东部发现了数十个大型、超大型矿床,而化探异常信息的提取,是进一步勘查工作部署与找矿突破的关键。诺仓地区位于冈底斯成矿带西部,大地构造位置属冈底斯岩浆弧,地球化学景观分区属于高寒湖沼区。研究区内出露的地层主要为下石炭统永珠组(C1y):主要分布在区内北部、北西部,为一套浅海相碎     

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