秩相关权法及其在资源靶区定位预测中的应用

提出了一种矿产资源靶区定位预测的统计方法－秩相关权法。该方法以评价目标变量（矿床的资源量，矿床规模等）与成矿和控矿地质变量（定量地质变量，半定量地质变量和定性地质变量）之间的秩相关性研究为基础，用地质变量与目标定量之间的τ秩相关系数来衡量地质变量的重要程度，用矿床统计单元之间的联系度来评价资源靶区的优劣。     

秩特征分析方法在矿产资源预测中的应用

提出了一种新的矿产资源靶区定位预测的统计方法—秩特征分析方法。该方法以地质变量之间秩相关分析为基础,根据地质变量集合中某一地质变量与其余地质变量之间总的秩相关程度来度量该变量的重要性大小,根据每个地质变量在统计单元（万能的资源靶区）上的取值情况计算单元成矿联系度,,再根据单元成矿联系度相对大小评价优选矿产资源靶区。该统计方法可以同时使用定性、定量和半定量三种地质变量,减少了由于数据离散化而造成的地质信息丢失,可以最大限度地利用各种类型地质变量所提供的有用信息。     

定向独立权模型及其在矿产资源预测中的应用

提出了一种矿产资源靶区定位预测统计方法－定向独立权法。该方法将统计单元关联度定义为诸地质变量的线性组合,即Ｙ＝Ｘｄ．通过研究地质变量作用于评价目标参考变量（例如,矿化强度、矿床和矿点数目或规模等）的方向和相对大小来确定诸地质变量的权系数ｄ;用统计单元之间的关联度（Ｙ）评价资源靶区的优劣。     

矿产资源定量评价中待发现矿床数目的估算—以委内瑞拉和波多黎各为例

美国地质调查所广泛应用的矿产资源定量评价方法建立在矿床模型之上，包括三部分工作内容：（１）选择合适的矿床模型并在地质因上圈出相应矿床的可能成矿区；（２）建立每类矿床的品位一吨位模型；（３）估算每类矿床的待发现数目。本文着重讨论如何用矿床密度法和靶区计算法对待发现矿床数目进行估算。矿床密度法是通过类比进行的，也就是把评价区与地质情况类似、勘探程度高的地区的矿床密度相比。此法适用于资料很少或没有的地区，本文给出了怎样用此法估算低硫化物石英脉型金矿（本文中委内瑞拉）的数目。靶区计算法是一种通过统计矿点，地球物理、地球化学异常或勘探基地的数目，并对每个靶区给定一个发现符合品位一吨位分布模型的矿床产出概率，最后获取某地区矿床数目的方法。此法适用于具有详尽地质、地球物理、地球化学和矿床、矿点资料的地区。本文运用这个方法对波多黎各岛斑岩金—铜矿床数目进行了估算。     

基于熵权法的新疆阿尔泰成矿区金矿床定位预测研究

      本文通过结合信息熵和灰色关联度来分析地质变量和矿床单元之间的关系,以达到圈定成矿靶区的目的。在地质、 物探、化探、重砂等资料研究的基础上提取了87个综合信息地质变量。在综合信息矿产预测理论与方法的指导下,将研究 区域划分为16个金矿床密集单元和14个金异常密集区为单元,引入熵权法对定性变量和定量变量分别计算信息熵和变量权 值,然后采用灰色关联分析法来定量解析单元之间的关联程度。结果表明：重力梯度、航磁、重磁吻合以及汇水盆地异常 等地质变量可以作为研究区域寻找金矿的有效地质标志,6号、 22 号、 18号和19号等单元可以作为一级远景成矿靶区,这与 很多相关研究结果基本一致,从而表明该方法能被有效应用于圈定找矿靶区。     

“证据权”法在西南“三江”南段矿产资源评价中的应用

证据权法本身是一种离散的多元统计方法。阐述了矿物资源潜力区的概念,简述证据权法的基本原理。以西南“三江”南段为例,首先在地质、地球物理、地球化学以及遥感地质等致矿信息提取的基础上,运用证据权法定量分析各类致矿信息(控矿因素)与矿产资源空间分布的关系;进而选择最佳控矿因素作为资源评价变量,据其变量计算每个单元的后验成矿概率;最终根据后验成矿概率定量圈定和评价找矿靶区。实践证明:在GIS环境下“,证据权”与找矿信息结合能够有效区分矿化有利地段和不利地段,从而达到定量快速圈定和评价找矿靶区之目的。整个过程是借助于MOPAS3.0评价系统实现的。     

锑矿地球化学定量预测在贵州榕江-雷山地区的示范

在全国矿产资源潜力预测评价项目的基础上,以区域化探资料二次开发为前提,通过总结已知典型锑矿床的成矿成晕地质、地球化学特征,在贵州榕江-雷山地区,对不同地质单元（盖层和基底）开展锑矿的地球化学定量预测示范工作。以相似度、成矿地质条件、矿床点分布特征、元素组合特征、Sb异常强度为预测变量,对榕江-雷山地区锑矿进行了预测靶区的圈定,从地球化学角度,通过类比法、面金属量法对圈定预测靶区的资源量进行估算,为矿产资源潜力预测评价提供地球化学预测资料。     

江西省武山铜金矿床（体）立体定量预测及靶区优选

文中概述了江西九瑞武山铜金矿床（体）地质特征，建立了块状硫化物型、矽卡岩型，斑岩型铜金矿床（体）综合信息找矿模式；运用数学地质方法着重分析研究了武山铜金矿床不同类型矿体的空间变化规律，介绍了矿床（体）立体定量预测及靶区优选的找矿预测效果     

有利因素相关法在松潘地区“东北寨式”金矿资源评估中的应用

据“东北寨式”金矿的成矿模式,结合松潘地区的成矿条件、地球化学异常评价以及资料水平和工作程度等,选择“有利因素相关法”对本区内334资源量进行了远景预测,取得了很好的结果。该方法实际上可归入“矿床模拟估计法”中,其主要原理是：通过对已知对象的研究,阐明控矿因素(地质变量)与矿产资源量之间的关系,建立一定矿床类型的矿产储量与地质条件之间的定量关系(定量预测模型)。将其移植到地质条件类似的预测区应用时,只要预测区上获得预测模型中相同的地质变量及其相同的数据类型值,代入模型,就可估算预测区内的矿产资源量。预测结果,在松潘地区,“东北寨式”金矿可望增长的3341外资源量约为81吨,3342资源量约65．9吨,为下步在该区部署地质工作提供了依据。     

基于数字模型的居隆庵铀矿床三维成矿预测

文章基于三维地质建模与地学统计分析相关理论,在江西相山铀矿田主要矿床成矿地质背景、矿床地质特征及成矿规律的研究认识基础上,运用地质建模软件SKUA-GOCAD,建立了居隆庵铀矿床的地形地貌、构造、地层和矿体三维数字模型,并开展了成矿有利信息定量提取分析。运用三维证据权法和三维信息量法对居隆庵铀矿床开展了“定位-定量-定概率”的隐伏矿体三维定量预测研究工作。通过对矿床定量预测获得了成矿高值区,圈定了5个靶区（3个A级靶区和2个B级靶区）,并开展了资源量估算,计算出总资源量为10 983 t。预测结果表明居隆庵矿床找矿潜力巨大,研究成果为该矿区的后续矿产勘查工作提供了重要参考依据,同时也为相山盆地铀矿床的勘探开发提供了技术支持和找矿思路。     

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