云南镇沅外樟盆金成矿地质及地球化学特征     

李高良  曹良琨  李小宽  马晓萍  文杰 《云南地质》2010,29(1):19-24

金矿受北西—南东向构造破碎蚀变带控制的中低温热液型。提出岩石、构造、蚀变、化探找矿标志。  相似文献   

墨江大平掌岩体岩石地球化学与成因     

杨洪伟  邓江红  王道永 《云南地质》2010,29(4):475-479

大平掌岩体为碱性高钠质基性辉绿岩,印支期浅成侵入,大陆环境玄武岩低度部分熔融的产物。  相似文献   

腾冲勐蚌铌钽锡矿矿床成矿地质条件     

白平  陈海军  李建洪  田燕红 《云南地质》2010,29(3):295-298

矿床含两条脉状物,分别赋存于燕山晚期第一阶段(V1)和第二阶段(V2)花岗岩云英岩化带中,V1为半风化、全风化铌钽矿,V2则为原生锡矿。共生黑钨矿、白钨矿。成因与构造、中酸性侵入岩密切相关。  相似文献   

高速远程滑坡-碎屑流运动机理研究发展现状与展望   总被引：6，自引：0，他引：6  

张明  殷跃平  吴树仁  张永双 《工程地质学报》2010,18(6):805-817

高速远程滑坡-碎屑流具有极高的运动速度和超远距离的位移,往往能够引发灾难性事故,造成严重的生命财产损失,因此,它的运动机理,即高速远程效应机理一直是国内外学者研究的热点。目前国外主要存在四种观点:空气润滑模型、颗粒流模型、能量传递模型和底部超孔隙水压力模型。但是,由于高速远程滑坡-碎屑流自身的复杂性,到目前为止,研究还没有取得公认的成果。中国是高速远程滑坡-碎屑流的频发区,因其研究才刚刚起步,研究成果还处于定性阶段。本文在查阅大量文献的基础上,从理论和技术两方面分别阐述了国内外高速远程滑坡-碎屑流运动机理研究的发展现状,对目前纵多的理论和模型进行了归纳与总结,点评了目前研究的难点,并在此基础上提出了今后的研究重点。本文是国内外首次对该领域的研究进行系统的归纳和总结,对今后类似的研究具较高的参考价值。  相似文献   

锦屏一级左岸垫座以下坝基地质缺陷初步评价     

刘明  黄润秋  严明  林锋  霍俊杰 《工程地质学报》2010,18(6):933-939

锦屏一级左岸垫座以下发育的不良地质单元,不仅破坏其岩体的完整性,而且可能导致建基面抗变形能力的不均匀性,以致对坝基岩体带来不良影响,危及拱坝安全。立足于坝基岩体质量环境,将垫座以下不良地质体划分为内倾顺层构造带,陡倾切层构造带,溶蚀裂隙带等三大综合缺陷类型,并阐述了各类缺陷的性状及其对坝基完整性、均匀性、变形性等方面的控制作用,分析了其典型声波曲线的波速量值及衰减特征。由此,按"轻度"、"中等"、"强烈"三个等级,定性的分区评价了各部位缺陷对坝基岩体的影响程度。着重认为f2断层附近,规模较大、间距较小、波速值低(2500-3500m·s-1)的内倾顺层构造带,不仅控制着岩体的抗剪性能,而且对坝基变形分异和基地应力分布存在"强烈"影响,应对其进行单独处理。  相似文献   

利用目标向量空间变换方法提取含矿岩层的研究——以新疆卡特里西地区为例   总被引：1，自引：0，他引：1       下载免费PDF全文

刘素红  马建文  燕守勋  蔺启忠  王元龙 《地质科学》2000,35(3):370-375

多因子线性变换是处理多波段遥感数据的数学方法,应用该方法对于图象主要特征的分离和提取具有很好的效果.但是,遥感图象数据中的岩性信息光谱分布复杂多样,在信息强度和分布方面较弱,使用现有的变换很难将岩性信息提取出来.为了完成遥感岩性填图的任务,本文提出利用目标向量空间线性变换的方法,简化所要提取的目标信息的光谱结构,提取目标信息.根据研究区内岩性目标地物的图象灰度光谱分布选择空间域坐标轴的位置,使需要分离的岩性信息只在一个轴上的投影不为0,从而将岩性目标信息分离出来.该方法在新疆且末卡特里西地区提取铜矿带岩性取得了较好的结果.  相似文献   

塔里木盆地巴参1井石灰系顶界的商榷     

周永昌  王良俊  袁先智 《新疆地质》2000,18(1):18-27

前人将巴参１井井学１８８２￣１９９７ｍ划归下二叠统南闸组,将井深１９７７￣２０９４．５ｍ划归上石炭统小海子组,经“七五”、“八五”科技攻关研究,从Ｔｉｎｇ化石资料,巴参１井井深１９１０￣２０７５ｍ,自上而下含有Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａ,Ｔｒｉｔｉｃｉｔｅｓ事,但与之相当的巴探２井地层包括Ｔｒｉｔｉｃｉｔｅｓ,Ｆｕｓｕｌｉｎｅｌｌａ带,结合岩石地层、测井地层、地震地层、接触关系及与邻区对比  相似文献   

Rock glacier dynamics in a marginal periglacial high mountain environment: Flow, movement (1991–2000) and structure of the Argualas rock glacier, the Pyrenees     

E. Serrano  J.J. San Jos  C. Agudo 《Geomorphology》2006,74(1-4):285-296

The Argualas rock glacier is located on the southern side of the Central Pyrenees (Argualas massif). Vertical electric sounding, debris surface analysis and a topographic survey were performed on this rock glacier between 1991 and 2000. High precision measurement records were obtained using a total station. Horizontal and vertical movements of the rock glacier were measured by means of sixteen steel rods. Horizontal and vertical angles and distances to each rod were measured from three stations on a bedrock ridge. Total and annual average displacements were derived from the emergence value and the horizontal displacement of each rod. Then the horizontal and vertical displacement rates in different sectors of the rock glacier were compared. The inferred surface deformation was characterized by both extensional and compressive flows as well as thinning of the frozen body. The displacement rates showed temporal variations related to atmospheric thermal changes, pointing to a high sensibility of the rock glacier.  相似文献   

Quaternary tectonics and large-scale gravitational deformations with evidence of rock-slide displacements in the Central Apennines (central Italy)   总被引：1，自引：1，他引：1  

Fabrizio Galadini   《Geomorphology》2006,82(3-4):201-228

Eight cases of large-scale gravitational movements (with evidence of rock-slide type displacements) evolving close to Quaternary faults have been analysed in the Central Apennines. Geomorphological and structural surveys have defined the relationship between the gravitational displacements and the tectonically-controlled modifications of the landscape. The evolution of all the investigated cases has been conditioned by the presence of fault planes located along the mountain slopes. In most cases (Mt. Cefalone, Cima della Fossa, Villavallelonga, Casali d'Aschi, Gioia dei Marsi), the faults played or are playing a primary role in increasing the local relief and their activity represents the main geomorphic factor conditioning the gravitational movements. This kind of relationship has been observed along mountain slopes bordering depressions which have not been drained for most of their geomorphic history or have been characterised by an evolution of the hydrographic network that has been conditioned only by the local tectonic subsidence. In such cases, the gravitational movements develop in the footwalls of the faults. In other cases (Fiamignano, Pescasseroli) the faults have played a passive role, since they only bound the sliding masses and coincide with the surficial expressions of the sliding planes. Therefore, the gravitational displacements develop in the hangingwall of the faults. The evolution is conditioned by the incision of the hydrographic network in response to regional Quaternary uplift. The illustrated case studies provide a wide range of examples of the gravitational response of slopes to the modifications of the landscape due to linear and areal tectonics. The identification of the geomorphic traces of the large-scale gravitational movements along fault-controlled mountain fronts has implications for hazard, particularly for the evolution of the displacement. The quantitative analysis of the vertical displacements and data on the characteristics of the surface breaking during historical earthquakes demonstrate that along-fault offsets strongly increases where the unstable large-scale rock masses are located. Therefore, the large coseismic vertical offset may represent a major problem for the displacement of utilities and may represent a potential cause for the sudden and catastrophic evolution of the gravitational movement.  相似文献   

基于专家证据权重法的成矿远景区划与评价--以东昆仑地区金矿为例   总被引：7，自引：0，他引：7  

丁清峰  孙丰月 《地质科技情报》2006,25(1):41-46

在介绍专家证据权重法的基础上,将东昆仑地区的基础地质、区域成矿规律及典型矿床研究等方面取得的认识(知识系统)与证据权重法结合,提出并建立了一个基于专家证据权重法的矿产资源定量预测评价系统,该系统在根据知识系统对各证据因子赋权重的过程中体现了地质专家的思想.应用专家证据权重法对东昆仑地区金矿的成矿概率进行了定量计算,并进行了金矿成矿远景区划.研究结果表明远景区内预测含矿单元的后验概率二重积分的大小可代表远景区的总体成矿潜力,据此将各远景区进行分级排队,由高到低划分为A、B、C 3级.  相似文献