井中三分量磁测在青海尕林格铁多金属矿的应用     

王永国  汪钟莲  李暖  吴小波 《地质与资源》2016,25(1):92-96

尕林格铁多金属矿区为戈壁荒漠,第四系覆盖层厚度在120~200 m之间,钻探工程后进行三分量井中磁测是最为直接的寻找井底、井旁等盲矿体的方法.通过对尕林格矿区钻孔的三分量井中磁测资料分析,深入研究ΔZ、ΔH'曲线及ΔT'矢量的变化规律,在寻找钻井四周和深部隐伏的矿体,科学指导布设钻孔减少钻探工作量,以及指导钻孔施工进度,提高见矿命中率,取得了良好的效果.三分量井中磁测在矿区已经成为必不可少的方法之一.  相似文献   

基于盲源分离理论的地球化学矿致异常识别研究     

陈聆  郭科  柳柄利 《现代地质》2013,27(3):629-636

尝试将盲源分离技术用于地球化学领域中,应用盲源分离理论中的FastICA算法对西藏洞嘎普铜矿勘查区1∶10 000土壤地球化学测量数据进行了矿致异常识别研究。首先根据盲源分离算法建立反演化探数据元素组合模型,以此确定地球化学成矿元素组合;然后,利用分形方法确定地球化学单元素及元素组合的异常下限,圈定异常浓集中心,进而确定异常分带性;最后,将元素分带特性研究与研究区地质特征相结合,对比单元素异常图及组合异常图,对研究区的地球化学元素作出异常分类和异常评价解释,划分的4个异常区域在后期的工程验证中取得了很好的效果。  相似文献   

基于归一化的矢量空间数据盲水印算法     

张黎明  闫浩文  齐建勋  张永忠 《地球信息科学学报》2015,17(7):816-821

对于鲁棒矢量空间数据水印技术而言,几何变换攻击是难以对付的一种攻击。现有的抗几何变换攻击算法难以抵抗顶点攻击,因此,借用数据归一化的思想,本文提出了一种归一化的矢量空间数据盲水印算法。该算法在嵌入水印前将空间数据的坐标值进行归一化处理,以实现对平移和缩放的不变性,并通过修改顶点坐标数据的归一化值来嵌入水印。水印被多次嵌入,实现了水印的盲提取。实验结果表明,该方法对平移、缩放、増删点、裁剪、压缩、要素排序、数据格式转换等攻击具有较好的鲁棒性,同时能控制水印嵌入引起空间数据误差的大小。  相似文献   

城市犯罪空间盲区的综合治理研究   总被引：4，自引：0，他引：4  

王发曾 《地理研究》2010,29(1):57-67

综合治理城市犯罪的空间盲区,是解决城市犯罪问题的有效途径,其研究为城市规划、建设和管理有利于预防和控制犯罪,提供了新的理念与方法,为犯罪地理学和城市地理学开辟了一个新的研究领域。根据空间盲区的形态、性质和对犯罪的影响,将城市犯罪的空间盲区划分为公共、非公共、边际、移动和虚拟空间等5种类型。在述评国外城市犯罪空间研究进展的基础上,构建了城市犯罪空间盲区综合治理的理论平台,论证了空间盲区综合治理的不可替代性,提出了综合治理的基础理论要点和应用理论要点。空间盲区的形成有一系列深刻的空间区位因素,其综合治理研究应有明确的研究目标和方向,核心研究内容为5类空间盲区综合治理的途径、实施方案和措施。还提出了综合治理研究的思路、方法和关键技术。  相似文献   

足尺钢框架振动台试验及动力弹塑性数值模拟   总被引：4，自引：1，他引：3  

韩小雷  陈学伟  郑宜  彭樵斌 《地震工程与工程振动》2008,28(6)

本文通过有限元分析程序OpenSees对一足尺四层钢框架结构进行静力及动力弹塑性分析,结构构件采用自由度较少的纤维模型模拟。在振动台试验之前,预测足尺钢框架结构连续在小震、中震及大震作用下的响应,将预测分析结果与振动台试验结果进行对比,结果显示该数值模拟方法能很好地反映结构的弹塑性行为及破坏机制,准确预测结构的地震响应及大震下结构倒塌时间。这进一步说明基于纤维模型的整体结构弹塑性分析方法,由于自由度数少,适用于整体结构抗震分析。  相似文献   

THREE-DIMENSIONAL STRUCTURAL FEATURES OF THE PENGXIAN ACTIVE BLIND FAULT IN THE CENTRAL LONGMEN SHAN FRONT BELT          下载免费PDF全文

WANG Zhen-nan  LU Ren-qi  XU Xi-wei  HE Deng-fa  CAI Ming-gang  LI Ying-qiang  LUO Jia-hong 《地震地质》2019,41(4):944-959

The Pengxian blind fault is a typical active fault in the central Longmen Shan front belt. It has important reference value for understanding the growth mode and process of the eastern Tibetan plateau. Because the fault is covered by the thick Upper Cenozoic strata in the western Sichuan Basin, its three-dimensional spatial distribution, structural style and formation mechanism remain unclear. In this paper, based on several high-resolution 3-D seismic reflection profiles, together with near-surface geological data and borehole data, we investigate the structural geometry of the Pengxian blind fault and build a 3-D model based on the results. We analyze the shape and scale of underground spatial distribution of the fault through a three-dimensional fault model. According to the theory of fault-related fold and fold-accommodation fault, this paper discusses the forming mechanism of the Pengxian buried structures. The shallow tectonic deformation in front of Longmen Shan is closely related to the detachment layer of the Middle and Lower Triassic, and this detachment layer f1 horizontally propagates into the Longquanshan anticline in the western Sichuan Basin. The Pengxian buried fault is a typical fault-bend fold and the f1 horizontally propagates into the western Sichuan Basin with a fault slip of 3.5km. The Pengxian blind fault is a high angle(50°~60°)thrust fault developed in the front wing of the kink-band zone, striking NE-SW, with a total length of~50km; But the fault is not connected with the Dayi buried fault in the south section of Longmen Shan. They are two different faults, and this defines the scale of the Pengxian blind fault. This limitation makes sense for analyzing and evaluating the magnitudes of potential earthquake. All above study provides research basis for further analysis of the potential seismic risk in this area. The Pengxian blind fault is parallel to the anticlinal axis with small amount of offset as a fold-accommodation fault. We believe that the fault formation is related to the fold deformation of the fold front limb. The study reveals the geometry, kinematics and formation mechanism of the Pengxian active fault, and provides a basis for further analysis of fault activity and hazard. Therefore, there is little possibility of strong earthquakes at the Pengxian blind fault due to its formation mechanism of the fault which is generally characterized by fold deformation and shortening deformation. In this paper, we discuss the location of Pengxian blind fault in the middle of Longmen Shan and Sichuan Basin. Because the Pengxian buried structures are in the transition area, the shortening amount in Pengxian indicates that the absorption in the basin is quite limited. It reflects the blocking effect of Sichuan Basin. In the study, we find that the relationship between folds, faults and sediments is an important part of tectonic interpretation; the theory of fault-related fold and fold-accommodation fault is well used for analysis. This would have great significance for the study of structural deformation, which can help to build a three-dimensional model of fault.  相似文献   

大型金矿盲矿的原生叠加晕和包裹体气晕、离子晕预测准则     

李惠 《地质与资源》1996,5(4):241

本文论述了热液型金矿床大矿、富矿的不同成矿阶段形成的矿体(晕)和石英包裹体气晕、离子晕的垂直分带及其叠加特点,建立了金矿原生叠加晕理想模式和包裹体气晕、离子晕理想模式,总结出了应用叠加晕预测盲矿的准则。  相似文献   

辽宁五龙金矿构造叠加晕研究   总被引：4，自引：0，他引：4  

俞炳 《地质与勘探》2020,56(5):898-914

五龙金矿是辽东矿集区的大型石英脉型金矿床,累计黄金储量超过80吨,平均品位为5.35g/t。随着开采量的增加,目前该矿床开采深度达近千米,保有储量不断减少,步入危机矿山行列,急需开展矿区深部找矿预测研究,实现寻找深部盲矿的有效突破。本次研究在前人研究工作的基础上,分析五龙金矿床矿石微量元素地球化学特征,运用相关分析、聚类分析、因子分析等多元统计方法,对五龙金矿构造叠加晕进行了系统研究。结果显示,五龙金矿成矿过程具有多期次和多阶段的特征,各指示元素在矿体轴向上具有前缘晕、近矿晕、与尾晕相互叠加的现象,该现象是深部盲矿预测的重要依据,反映了深部有盲矿存在的可能性。  相似文献   

Quantitative prediction of gold lodes in gold mineralization series based on large-scale mineralization information measurement     

Anzhou Liu  Shaohua Liu  Xujun Li 《Mathematical Geology》1992,24(6):631-644

The ability to quantitatively predict Au lodes in Au mineralization series with data from large-scale mineralization information is greatly needed. This paper discusses how to (1) classify the oreforming information, (2) set up the mineralization information model, (3) divide the statistical units within the minimum area of the mineralization anomalies, (4) select the comprehensive ore-forming (controlling) information variables, and (5) carry out the quantitative prediction using some newly proposed statistical models. Finally, the quantitative prediction results for Au lodes in a Au deposit, the Aohan Banner in Mongolia, are provided. Among the three first-grade prediction targets, two were tested and have been found to have industrial significance.  相似文献   

柴达木北缘达肯大坂群与滩间山群的接触关系   总被引：3，自引：0，他引：3  

夏元祁 《地层学杂志》1996,20(2):123-127

柴达木北缘古元古界达肯大坂群片麻岩系与上奥陶统滩间山群绿片岩系之间先存的角度不整合已经受到后期滑脱构造变形的强烈改造,是一种变质岩区特有的构造接触关系——隐蔽不整合,从而明确"过渡带"片岩系实质上是一条变质滑脱带,是伸展体制下低角度正断层沿不整合面滑脱拆离的产物,其主体应划归达肯大坂群。  相似文献