桂北雪峰期含锡黑云母花岗岩成因的见证

作者对桂北地区进行了野外地质工作，重点观察和研究了雪峰期含锡黑云母花岗岩和四堡群变质岩的产状和特征，并采集了它们的标本，进行了系统的岩矿鉴定、人工重砂分析和岩石化学成分对比，从宏观到微观总结出四堡群中、下部的变质岩与雪峰期的含锡黑云母花岗岩有成因关系的１０个方面的证据，并被高温高压成岩实验所证实。这些证据和分析方法对于研究华南古老变质岩地区的同类花岗岩有其重要意义。     

Expert system for earthquake prediction（ESEP）（2）－Knowledge representation and evidence combination

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GIS矿产资源预测中的证据权重法

地理信息系统(GIS)技术的应用已成为提高矿产资源预测水平的重要途径。矿产资源预测的方法很多，证据权重法是其中的一种重要方法，它是基于二值图象的地学统计方法。基于GIS的证据权重法矿产资源预测是通过对与矿产资源相关的地学信息的叠加分析进行预测，其中每一种地学信息都作为预测的一个证据因子，而每一个证据因子对矿产资源预测的贡献由其权重值确定。基于GIS的证据权重法矿产资源预测的优点是数据驱动、易于编程实现，在金矿资源预测中已有很多成功的应用。     

GIS Predictive Model for Producing Hydrothermal Gold Potential Map Using Weights of Evidence Approach in Gengma Region, Sanjiang District, China

Gengma region, Sanjiang district is known to have some large-scale gold deposits. GIS predictive model for hydroghermal gold potential was carried out in this region using weights of evidence modeling technique. Datasets used include large-scale hydroghermal gold deposit records, geological, geophysical and remote sensing imagery. Based on the geological and mineral characteristics of areas with known gold occurrences in Sanjiang, several geological features were thought to be indicative of areas with potential for the occurrence of hydroghtermal gold deposits. Indicative features were extracted from geoexploration datasets for use as input in the predictive model. The features include host rock lithology, geologic structures, wallrock alteration and associated (volcanic-plutonic) igneous rocks. To determine which of the indicative geological features are important spatial predictors of area with potential for gold deposits, spatial analysis was done through the modeling method. The input maps were buffered and the optimum distance of spatial association for each geological feature was determined by calculating the contrast and studentized contrast. Five feature maps were converted to binary predictor patterns and used as evidential layers for predictive modeling. The binary patterns were integrated in two combinations, each of which consists of four patterns in order to avoid over prediction due to the effect of duplicate features in the two structural evidences. The two produced potential maps define almost similar favorable zones. Areas of intersections between these zones in the two potential maps placed the highest predictive favorable zones in the region.     

Spatial Association of Mineral Occurrences and Curvilinear Geological Features

Qualitative and quantitative knowledge about the spatial association between mineral occurrences and geological features are important in mineral potential mapping. Two existing methods for quantifying spatial association between mineral occurrences and curvilinear geological features are applied to the Baguio district of the Philippines. An experimental method is described and applied to the study area as well. The results of the three methods are highly similar, which demonstrates the effectiveness of the experimental method presented here for quantifying spatial association between mineral occurrences and curvilinear geological features. It is shown that gold occurrence in the Baguio district are strongly spatially associated with northeasterly trending faults/fractures rather than with northwesterly trending faults/fractures. It is also shown that the spatial association between the gold occurrence and older batholithic intrusives is stronger than the spatial association between gold occurrence and younger porphyry intrusives. These spatial geoinformation characteristics can be used as evidential data layers in GIS-based mineral potential mapping.     

胶东金矿形成期间地幔流体参与成矿过程的碳氧氢同位素证据

胶东地区发育有两种类型的金矿床，以玲珑，焦家，三山岛，乳山为代表的石英脉型-破碎蚀变岩型和以大庄子，蓬家夼为代表的胶莱盆地北缘滑脱破碎带内的角砾岩型金矿，本文选择了两种类型中的玲珑，三山岛和大庄子金矿床进行碳氧氢同位素测定。初步认为两类金矿属于同一成矿系统，它们形成于120Ma左右的华北克拉通岩石圈减薄和软流圈上涌期间，岩浆流体和地幔脱气与胶东世界级金矿的形成密切相关，在石英脉型-破碎蚀变岩型矿石中可见深刻的地幔流体和岩浆流体的“烙印”。形成于滑脱破碎带中的角砾岩金矿流体与中生代大气降水和海相碳酸盐岩发生了强烈的交换作用。     

基于ArcView3.2的证据权重法在层间氧化带型砂岩铀矿定量评价中的应用

介绍了证据权重法及其理论基础,根据层间氧化带型砂岩铀矿成矿理论,应用由ArcView3.2二次开发形成的砂岩铀矿勘查信息系统软件在克鲁伦盆地内提取控矿信息,最后通过证据权重分析综合证据因子,完成盆地内层间氧化带型砂岩铀矿的远景预测。     

华南及其相邻边缘海域一些重要断裂的地球物理证据

通过对华南及其相邻的边缘海域的布格重力异常和磁力数据的处理和分析，利用水平方向导数、小波变换及典型剖面反演的共同结果，在研究区中分辨出方向各异的主要断裂共39条，根据重磁异常特征并结合层析成像结果分析了研究区内断裂的分布与延伸，特别对红河断裂带等重要断裂进行了重点讨论，并探讨了它们的延伸及与周边各地质单元之间的关系。     

基于证据理论的水稻遥感信息提取方法研究

水稻播种面积是农业管理部门关心的重要问题之一。本文介绍了证据理论在遥感图像分类上的应用,并以汉川市为示范区,采用2002年TM遥感影像,在GIS技术支持下,通过建模运算,剔除不可能是水稻的像元。然后将证据理论用于影像分类,将影像初次分类结果,与参考图对照,将不满足要求的区域提取出来,再次进行第二次分类。将第二次分类结果与参考图对照,显示分类效果满足要求;若不满足要求,可继续进行再次分类,直到分类效果满意为止。将两次分类结果中的水稻信息进行叠加,提取出水稻遥感信息,经检验精度达到91.39%。     

基于GIS的多元信息成矿预测研究——以赤峰地区为例

由于找矿难度越来越大,应用地质、地球物理、地球化学、遥感等资料进行综合信息成矿预测是目前找矿工作发展的一个重要趋势。GIS技术已成为多元信息深层次提取与综合,实施综合信息成矿预测的有效工具。文中以赤峰地区有色金属资源成矿预测研究为例,在总结区域成矿规律的基础上,以地质异常致矿理论为指导,利用GIS平台提取地质、地球物理、地球化学、遥感多元地质找矿信息,并利用航磁、重力资料进行隐伏构造、岩体等相关地质找矿信息的推断与解释,进一步丰富和深化成矿地质背景与深部找矿信息。在此基础上,建立多元地质异常信息找矿模型,采用证据权模型进行多元找矿信息的综合,对有利成矿区进行圈定。预测结果显示,在赤峰地区北部有三条北东-南西向的有利成矿区带,在南部有一条北西-南东向有利成矿区带,已知的86%的矿床或矿点位于这些有利区内,显示出良好的预测效果。本文的研究思路、方法为多元信息成矿预测研究提供了参考,其成果为赤峰地区的有色金属资源勘探开发提供了科学依据。