地球化学勘查快速圈定找矿靶区——以黑龙江省黑河市大新屯锑-金矿床的发现为例

黑河市大新屯锑-金矿床位于大兴安岭成矿带东北部,区内构造、岩浆活动频繁.1∶5万水系沉积物Sb、Au、Hg异常强度较高,规模较大,是金及多金属成矿有利部位.为了对区内1∶5万水系沉积物异常进行评价,选定了规模最大的新07Hs-35异常,利用土壤地球化学测量工作方法对异常进一步查证.经土壤地球化学测量工作后圈定Sb、Au、Hg、Ag、As、W土壤地球化学异常多处,以Sb、Hg、Au异常为主,各元素异常浓集中心吻合较好.因此利用槽探工程对圈定的土壤地球化学异常进行了验证,发现了锑-金矿体,从而确定了大新屯锑-金矿找矿靶区,说明地球化学勘查快速确定找矿靶区是成功的.     

甘肃省夏河县完洛合—科才一带水系沉积物地球化学特征及找矿意义

夏河县完洛合—科才一带的水系沉积物地球化学异常特征显示该区金矿具有良好的金矿成矿远景,通过1∶1万水系沉积物测量,发现该区具有Ag、Au、Hg、As、Sb等元素低背景高富集异常特征,结合成矿元素地球化学特征,提出了该地区的找矿标志,指出了找矿方向。     

黑龙江省呼玛县大砬子地区水系沉积物地球化学特征及找矿远景预测

基于大砬子地区1∶50 000水系沉积物测量成果,统计计算了元素地球化学参数,分析研究了元素分布特征、元素组合特征、元素异常特征,认为研究区Au、As、Sb、Hg异常规模较大,相对离散程度大,具有较大的成矿潜力。根据成矿地质条件、地球化学异常特征,优选出王福店金矿成矿远景区和余庆老沟金矿成矿远景区2个远景区为找矿靶区。     

甘肃迭部县尖尼—桑坝一带金地球化学特征及找矿意义

尖尼—桑坝一带自开展1∶20万区域化探以来,先后进行了异常查证,发现了众多的金矿床点。本文探讨了该区金地球化学特征,特别是1∶5万水系沉积物测量、1∶1万土壤地球化学测量,显示出Au异常规模大、峰值高、浓度分带好,Au、As、Ag、Hg、Sb等组合异常套合好的特征。采用土壤测量浓缩异常源、缩小找矿靶区,发现了金矿体,找...     

赛木隆地区水系沉积物地球化学特征及找矿

为了研究青海省赛木隆地区找矿远景,基于工作区最新1∶5万水系沉积物地球化学测量数据,总结分析了元素丰度特征、元素的离散特征、元素的共生关系特征,并对主要异常进行评序,认为工作区主要成矿元素是Au、W、As、Hg、Sb、Mo。结合区域成矿地质条件,优选了3处成矿远景区,为工作区以后的地质勘查提供了重要的指导作用。     

赛木隆地区水系沉积物地球化学特征及找矿

为了研究青海省赛木隆地区找矿远景,基于工作区最新1∶5万水系沉积物地球化学测量数据,总结分析了元素丰度特征、元素的离散特征、元素的共生关系特征,并对主要异常进行评序,认为工作区主要成矿元素是Au、W、As、Hg、Sb、Mo。结合区域成矿地质条件,优选了3处成矿远景区,为工作区以后的地质勘查提供了重要的指导作用。     

青海拉脊山东段水系沉积物地球化学异常特征

青海拉脊山东段水系沉积物地球化学测量,发现金源、喇嘛庙、七里寺峡Au、As、Ag、Bi、Sb、Hg等元素的水系沉积物组合异常.Au、Ag、As相对高浓度带发育形态、分布范围、异常浓集中心吻合,与区内已知尼旦沟金矿床地球化学异常特征可以类比,发现有金、铜矿体和金矿化,显示铜金成矿的有望远景地段.     

勘查地球化学在西藏色岗地区铅锌找矿中的应用

在西藏色岗扎西康铅锌整装勘查区内开展地球化学勘查。利用1∶5万水系沉积物测量编制异常图,发现区内Ag、Pb、Zn、Sb、Au、As、Bi、Mn等元素有不同规模的明显异常,且Ag、Pb、Sb、Au异常规模较大。通过土壤测量可以看出Ag、Pb、Zn、Sb、Au、As异常更显著。通过高精度遥感结果显示,化探异常位于线性构造附近;且已知矿化点位于断裂附近。通过土壤测量数据研究元素间组合关系,推断区内可能的矿床类型为为受构造控制的热液脉型铅锌矿,并对区内已发现的铅锌矿化点做着重介绍。研究表明区内寻找受构造控制的热液脉型铅锌矿有较好的找矿前景。     

勘查地球化学在西藏色岗地区铅锌找矿中的应用

在西藏色岗扎西康铅锌整装勘查区内开展地球化学勘查。利用1∶5万水系沉积物测量编制异常图,发现区内Ag、Pb、Zn、Sb、Au、As、Bi、Mn等元素有不同规模的明显异常,且Ag、Pb、Sb、Au异常规模较大。通过土壤测量可以看出Ag、Pb、Zn、Sb、Au、As异常更显著。通过高精度遥感结果显示,化探异常位于线性构造附近;且已知矿化点位于断裂附近。通过土壤测量数据研究元素间组合关系,推断区内可能的矿床类型为为受构造控制的热液脉型铅锌矿,并对区内已发现的铅锌矿化点做着重介绍。研究表明区内寻找受构造控制的热液脉型铅锌矿有较好的找矿前景。     

用化探方法在黑龙江砂宝斯金矿区找矿的效果

通过1：5万水系沉积物测量工作，圈定金异常。结合1：2．5万和1：1万土壤测量工作追索金异常源；根据岩石地球化学工作分析成果，查明砂宝斯金矿区Au、As、Sb、Tl、Sn、Cu地球化学特征有其分布和分配规律；运用元素相关性分析确定Au与As、Sb密切相关；利用As、Sb岩石异常可指导矿区深部找矿工作。通过探矿工程揭露，在砂岩、大理岩中发现2条矿化带，圈定4条金矿体和5条金矿化体。     

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