莫坝-希拉沟地区水系沉积物地球化学特征及找矿

莫坝-希拉沟地区16个元素水系沉积物测量地球化学特征研究表明,贫乏元素有Au、Hg、Mo;正常元素有Cu、Pb、Zn、Co、Mn、W、Sn、Bi;富集元素有As、Sb、Ag、Fe、Ni;无强富集的元素。通过各元素空间分布研究,对主要地球化学异常进行推断解释,指出三叠系地层、尤其与喷出岩有关的地区是寻找Cu、Pb、Zn、Au、Ag等多金属矿的有利地区。     

奔都-汤满地区水系沉积物地球化学特征及找矿

对奔都-汤满地区16个元素水系沉积物测量地球化学特征研究,贫乏元素有Sn、Bi、Mo、W;正常元素有Pb、Ag、Hg、Au;富集元素有Zn、Cr、Sb、As;强富集的元素有Cu、Ni、Co、Cd。通过各元素时空分布研究,对主要地球化学异常进行推断解释,指出区内蛇绿混杂岩带、冈达概组二段是寻找Cu、Pb、Zn、Au、Ag等多金属矿的有利层位。     

冀北小梨树沟地区土壤地球化学异常特征及其找矿预测

冀北地区矿产资源丰富,但第四系覆盖严重.为优选冀北小梨树沟地区的找矿靶区,在此地区开展了1:1万土壤地球化学测量工作,运用富集系数、变异系数等理论和方法,对研究区内Au、Ag、Bi、As、Cu、Pb、Zn、Mo、Mn共9种元素的测量数据进行统计分析,显示出Ag、Pb、Zn、Bi元素为研究区内有利成矿元素.运用SPSS软...     

青海北祁连冷龙岭地区水系沉积物元素地球化学特征及异常圈定

青海冷龙岭地区位于北祁连成矿段的东段,是形成与海相火山岩有关的块状硫化物矿床及岩浆热液型矿床的有利地区,具有良好的找矿潜力。在1∶5万水系沉积物测量成果的基础上,对青海冷龙岭地区Au、Cu、Pb、Zn等17种元素的地球化学特征进行了初步分析,发现本区Ag、Pb、Zn、W、Sn、Bi、Mo、Ba、Cd等元素丰度明显高于青海省及祁连地区水系沉积物的平均丰度值;元素分布特征显示下奥陶统阴沟群除Hg、La、Ce相对贫化外,各元素都呈现不同程度的浓集,加里东期侵入岩中Ag、Cu、Pb、Zn、W、Au、Sn、Bi等元素富集程度较高,海西期正长岩内Ba、La、Ce等元素富集程度较为显著;R型聚类分析和因子分析显示区内的主要成矿元素组合为Cu Pb Ag Mo Ba La Ce,Au具有独立成矿的潜力。结合元素地球化学参数及富集离散特征,认为本区Au、Ag、Cu、Pb、Zn、Mo、La、Ce等元素具有一定的找矿潜力。本次工作共圈定8个综合异常。根据研究区成矿地质背景、异常特征及查证成果,与该区域内浪力克铜矿床和青分岭金矿床的地质地球化学特征对比研究后,优选出干沙河和三道路圈—倒阳河2个成矿远景区。     

吉林省小西南岔金铜矿床地球化学特征

小西南岔金铜矿床为浅成金铜共生大型矿床,受岩体-地层-构造联合控制,以叠加富集为主.矿区分为南山和北山两个矿段.矿化主要发育在闪长岩和斜长花岗岩中的北北西向断裂带及岩体接触带中,矿化以含金铜石英硫化物脉型及密集细脉为主.矿区水系沉积物异常元素为Au、Cu、Ag、Bi、Zn、Mo（W、Sb、As）;土壤异常元素为Cu、Mo、Au、Ag、Bi;岩石地球化学异常为Au、Cu、Ag、Bi、Ta、Ba、Sr（As、Sb、Zn、Co、Ni、W、Mo）.原生晕中轴向分带序列为（Bs、Sr）-As-Ag-Pb-Sn-W-Au-Bi-Cu-Sb-CoTe-Ni-Zn-Mo.南山矿段水平分带序列为Au-Cu-Bi-Te-Ag-Pb-Zn-As-Co-Ni-W-Sb-Mo-Sn;北山矿段为Au-Cu-Bi-Te-AgAs-Sb-Mo-Pb-Zn-Co-W-Ni-Sn.矿床地球化学异常特征及其分带性显示北山矿段矿体剥蚀程度大于南山矿段,矿区北西部矿体剥蚀强度大于南东部,表明向矿区南部仍有较大找矿远景.     

大兴安岭北段西呼和楚鲁地区地球化学特征与找矿方向

西呼和楚鲁地区位于大兴安岭北段,由于森林沼泽覆盖和自然保护等原因,地质调查工作程度低,尚未取得找矿突破。近期开展的地球化学调查成果显示,与陆壳克拉克值相比,区域Ag、Pb、W、As、Sb、Bi元素富集,尤其是在石炭系莫尔根河组和早石炭世闪长岩、晚泥盆世石英闪长岩中含量很高,Cu、Au、Sn相对贫化;大多数成矿元素在区域内分布不均匀,尤其是Au、Ag、Mo、Bi在侏罗系满克头鄂博组、石炭世二长花岗岩和闪长岩体出露区分异极强,Cu在泥盆系大民山组、早白垩世花岗岩中,Au在石炭系莫尔根河组、晚泥盆世石英闪长岩中呈强分异型分布,在局部区域存在富集甚至强烈富集,较为利于成矿。区域主要成矿元素为Au、Pb、Ag、Mo、Cu,伴生成矿元素为W、As、Sb、Sn、Mn、Bi、Zn,主要成矿类型为热液型、火山岩型。根据区域地球化学特征,预测区域成矿潜力较大的地区为锡尼河-那日斯毛德、大架子山、一支沟-小孤山等地。     

江苏新沂高流地区土壤地球化学特征及找矿预测

在总结江苏新沂高流地区地质特征的基础上,结合区内1∶10 000土壤地球化学调查工作,系统研究该区元素含量及组合特征,并进行找矿预测。异常结果显示该区Au、Ag、Cu、Mo、Pb、Zn、As、Sn等单元素地球化学异常明显,其中Au、Ag、Mo 3个元素的异常强度和分带性均好,其形态分布受NNE向构造破碎和碱长花岗岩体等因素制约。在研究区共圈定了14处综合异常,通过异常评价,位于同一断裂带附近的3处异常成矿地质条件优越;对综合异常开展地球化学剖面查证工作,结果显示其中1处Au、Cu等元素峰值均位于NNE向断裂带中心位置。结合该区成矿地质条件和土壤地球化学异常特征,初步总结了研究区金、多金属矿找矿标志,为该区进一步找矿提供间接依据。     

地球化学测量找矿成功案例——黑河市北大沟金矿床的发现

黑河市北大沟金矿位于大兴安岭燕山期成矿带东南部,是在三道湾子金矿外围利用地球化学测量发现的石英脉型金矿床.通过与三道湾子金矿地球化学特征对比,选定了该区为找矿靶区进行土壤地球化学测量工作.圈定Au、Ag、As、Sb、Cu、Pb、Zn、Mo异常多处,以Au、Ag、As、Sb、Mo异常为主,各元素异常浓集中心吻合较好.经过对异常验证,发现了北大沟金矿,说明该靶区的选定是比较成功的,地球化学测量在该区找矿效果是显著的.     

黑龙江省某地区地球化学异常、地质特征及成矿预测

在黑龙江某地区1:5万水系沉积物测量的基础上,对测区内可能富集成矿的Bi、Cu、Hg、W、As、Au、Mo、Zn、Sb、Ag、Pb等元素地球化学特征进行了系统阐述,其中极有可能成矿的元素是Bi、Hg、Cu、Zn、W、Mo。     

辽宁虎山-永甸地区水系沉积物测量异常特征及成矿预测

对虎山-永甸地区1：5万水系沉积物资料处理结果显示：元素富集程度较高,Au、As、Bi变异系数较大.根据各元素的地球化学特征圈定了Au、Ag、Cu、Pb、Zn、Mo、As、Sb、Bi等单元素异常及7处多元素综合异常,揭示了区内异常的分布特征,评价了异常的找矿意义.进一步依据综合异常特征和地质信息划分出最佳成矿预测区4处,即太平湾-长甸河口预测区、古楼子-金坑预测区、车道岭-南碑沟预测区和长甸-李家沟预测区.     

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with