Research and application of mineral resources assessment by weights of evidence model based on SIG     

Yuanyuan Chuai  Keyan Xiao  Yihua Xuan  Shaobin Zhan 《世界地质(英文版)》2006,9(1)

Geological data are usually of the characteristics of multi-source, large amount and multi-scale. The construction of Spatial Information Grid overcomes the shortages of personal computers when dealing with geological data. The authors introduce the definition, architecture and flow of mineral resources assessment by weights of evidence model based on Spatial Information Grid (SIG). Meanwhile, a case study on the prediction of copper mineral occurrence in the Middle-Lower Yangtze metallogenic belt is given. The results show that mineral resources assessement based on SIG is an effective new method which provides a way of sharing and integrating distributed geospatial information and improves the efficiency greatly.  相似文献   

四川大岩子铂-钯矿床(点)热液成矿的地球化学证据   总被引：4，自引：0，他引：4  

成杭新  赵传冬  庄广民  刘英汉  张勤  赵支岗 《地球学报》2005,26(4):337-342

大岩子铂-钯矿区的岩石有白云岩、辉石岩脉、辉绿岩脉,矿体赋存在构造蚀变破碎带中,以外接触带的白云岩一侧为主,次为内接触带的辉石岩,矿石类型有矿化白云岩和矿化辉石岩两种类型。通过对含矿白云岩、含矿辉石岩、断层泥及辉绿岩的地球化学特征研究,认为大岩子矿床先后经历超基性岩浆的侵入,即形成辉石岩脉;基性岩浆的侵入,即形成辉绿岩脉;富含Pt、Pd的岩浆期后热液活动,即形成以Pt、Pd为丰、富含As、Cu、Sb、Ag、Cd的热液矿床,其中Pt、Pd的富集成矿主要与热液活动有关。  相似文献   

成矿过程奇异性与矿产预测定量化的新理论与新方法   总被引：5，自引：0，他引：5  

成秋明 《地学前缘》2007,14(5):42-53

在分析地震、滑坡、洪水、暴雨、森林火灾等一系列非线性地球系统过程共同特征的基础上,笔者提出了成矿过程作为奇异性过程的命题。探讨了成矿过程奇异性、广义自相似性、自组织临界性等基本非线性特征的内在联系。从多重分形理论出发给出了:(1)度量成矿域空间结构不均匀性的局部奇异性分析模型;(2)度量成矿多样性与自相似性关系的系列广义自相似性度量模型;(3)首次给出了奇异性指标作为度量控矿要素与矿床分布相关关系的非线性模型,提出了从奇异性出发计算成矿后验概率的新的对数概率模型;(4)介绍了成矿奇异性的动力学模拟过程。详细介绍了非线性矿产资源预测理论和方法的基本内容和模型。  相似文献   

食物景观对地方社会记忆的表征和塑造 ——以《舌尖上的中国》为例     

于雯静  郭永锐  侯欣宜 《热带地理》2021,41(3):495-504

以纪录片《舌尖上的中国》为数据来源,借助情感挖掘、语义网络分析以及扎根理论等方法探究食物景观对社会记忆的表征内容和塑造过程.研究结果表明:1)从情感分析结果来看,个体对食物景观的情感倾向总体呈现积极趋势,不同年龄、复杂的社会经历以及多元的社会角色是影响个体情感变化的重要因素,人们的情感认同形成了社会主流意识形态,并框定...  相似文献   

运用证据权重法进行阳性钉螺-地理因子的空间关系研究(英文)     

赵安  鲍曙明  宫鹏 《地球空间信息科学学报》2009,12(3):217-224

Schistosomiasis is a serious public health problem in the middle-lower Yangtze River Basin in China. Study of spatial variation of snail distribution that is related to microgeographic factors can help to choose pertinent measures for snail extinguishment and environment rebuilding. This paper studied the theoretical architecture of weights-of-evidence approach. The case study was made for spatial relation between the occurrence of infected snails and geographic factor combinations in Waijiazhou marshland of Poyang Lake region in China. The multievidence data came from the geographical factor combinations by crossing operation of vegetation coverage grade layer, cattle route distance grade layer, and special environment layer (181 combinations in total) in GIS. The calculation of weight contrast index shows that high vegetation coverage, cattle route distance of <45 meters, and special geographic factor “ground depression” had direct spatial relation with the occurrence of infected snails. The verification by crossing operation in GIS indicated 72.45% of the infected snails concentrated on the areas of positive weight contrast index (sequenced in an order of weight contrast index from high to low), demonstrating the high efficiency of the model established in finding infected snails according to the geographic factor combinations that can be explicitly discerned in the study area. Supported by a the National Natural Science Fundation of China (No. 30590370), the Research Project “Spatial Simulation of Schistosomiasis Susceptible Areas in the Poyang Lake Region” Sponsored by Science Research Plan 2007 of Jiangxi Normal University (Natural Science Category).  相似文献   

龙门山断裂带走滑方向的反转及其沉积与地貌标志   总被引：11，自引：0，他引：11  

李勇  周荣军  A L Densmore  M A Ellis 《矿物岩石》2006,26(4):26-34

根据龙门山前陆盆地西缘沉降中心、冲积扇侧向迁移、活动构造地貌和古地磁等标志及龙门山在中生代以来的走滑作用和走滑方向的标定研究,结果表明:龙门山断裂带具有走滑性质,走滑方向曾发生过反转,在反转之前以左行走滑作用为特征,在反转之后以右行走滑作用为特征。根据地层记录和古地磁证据,认为龙门山走滑方向反转的时间应介于43 M a~3.6 M a之间,即由中生代至早新生代时期的左行走滑作用反转为晚新生代时期的右行走滑作用。然对龙门山断裂带走滑方向反转的成因初步分析认为晚新生代龙门山右行走滑作用是印-亚碰撞后构造作用的产物,晚三叠世至早新生代左行走滑作用是青藏高原自晚三叠世以来大陆碰撞作用导致松潘-甘孜褶皱带北东-南西向缩短的产物。  相似文献