一种基于图层综合的矿产资源潜力制图模型   总被引：2，自引：0，他引：2  

赵文吉  陈永良  宫辉力 《地质科学》2003,38(2):267-274,262

提出了一种基于图层综合的矿产资源潜力自动制图模型。应用该模型生成矿产资源潜力分布图分三步完成:第一步,以每一种找矿标志的空间分布图为依据,生成相应的基本概率分配函数栅格图;第二步,统计综合基本概率分配函数栅格图;第三步,生成研究区矿产资源潜力分布图。利用新疆北部多拉纳萨依—阿舍勒地区的地质资料,比较了该模型与合成有矿可信度模型的找矿靶区圈定结果。两种模型的靶区圈定结果基本相同,证明证据理论模型是有效的和实用的。  相似文献   

Application of Data-Driven Evidential Belief Functions to Prospectivity Mapping for Aquamarine-Bearing Pegmatites,Lundazi District,Zambia   总被引：6，自引：0，他引：6  

Carranza  E. J. M.  Woldai  T.  Chikambwe  E. M. 《Natural Resources Research》2005,14(1):47-63

A case application of data-driven estimation of evidential belief functions (EBFs) is demonstrated to prospectivity mapping in Lundazi district (eastern Zambia). Spatial data used to represent recognition criteria of prospectivity for aquamarine-bearing pegmatites include mapped granites, mapped faults/fractures, mapped shear zones, and radioelement concentration ratios derived from gridded airborne radiometric data. Data-driven estimates EBFs take into account not only (a) spatial association between an evidential map layer and target deposits but also (b) spatial relationships between classes of evidences in an evidential map layer. Data-driven estimates of EBFs can indicate which spatial data provide positive or negative evidence of prospectivity. Data-driven estimates of EBFs of only spatial data providing positive evidence of prospectivity were integrated according to Dempster’s rule of combination. Map of integrated degrees of belief was used to delineate zones of relative degress of prospectivity for aquamarine-bearing pegmatites. The predictive map has at least 85% prediction rate and at least 79% success rate of delineating training and validation deposits, respectively. The results illustrate usefulness of data-driven estimation of EBFs in GIS-based predictive mapping of mineral prospectivity. The results also show usefulness of EBFs in managing uncertainties associated with evidential maps.  相似文献   

赣江断裂带的活动特征   总被引：1，自引：0，他引：1  

马逸麟  梅丽辉  何伟相 《安徽地质》2002,12(2):104-109

通过野外实地调查和综合分析前人资料,对长江中游鄱阳湖及江西江段水患区内的赣江断裂带的活动特征进行了详细介绍,并就其活动证据进行了探讨.  相似文献   

Where Are Porphyry Copper Deposits Spatially Localized? A Case Study in Benguet Province,Philippines   总被引：10，自引：0，他引：10  

Carranza  Emmanuel John M.  Hale  Martin 《Natural Resources Research》2002,11(1):45-59

To provide guides for exploration of porphyry copper mineralization at a district scale, we examine the spatial association between known porphyry copper deposits and geologic features in Benguet, Philippines. The spatial associations between the porphyry copper deposits and strike-slip fault discontinuities, batholithic pluton margins and porphyry plutons are quantified using weights of evidence modeling. In the training and testing district, the porphyry copper occurrences are associated spatially with strike-slip fault discontinuities, batholithic pluton margins and contacts of porphyry plutons within distances of 3 km, 2.25 km, and 1 km, respectively. In addition, the porphyry plutons are associated spatially with strike-slip fault discontinuities and contacts of batholithic plutons within a distance of 2.25 km and 3 km, respectively. Based on these significant spatial associations, predictive maps are generated to delineate zones favorable for porphyry copper mineralization and zones favorable for emplacement of porphyry plutons in Benguet province, Philippines. Validations of the predictive models demonstrate their efficacy in pointing to zones for subsequent follow-up exploration work.  相似文献   

Integration of Structural,Gravity, and Magnetic Data Using the Weights of Evidence Method as a Tool for Kimberlite Exploration in the Buffalo Head Hills,Northern Central Alberta,Canada     

Paganelli  F.  Richards  J. P.  Grunsky  E. C. 《Natural Resources Research》2002,11(3):219-236

In the Buffalo Head Hills area a weights of evidence statistical approach was used to determine the spatial relationship of NNE-, NE-, NW-, and ENE-trending lineaments to known kimberlite locations. This method outlined different degrees of spatial correlation between and lineaments, with higher correlations defined for the NNE, NE, and ENE lineament data sets. A weights of evidence model then was constructed using the structural lineament maps, the Buffalo High and Buffalo Utikuma terrane boundary, Bouguer gravity data, and magnetic characteristics of the Buffalo High and Buffalo Utikuma terranes. The model reveals maximum favorability for kimberlite exploration along the Buffalo High and Utikuma terrane boundary in correspondence with NNE-trending lineaments and their intersections with NE and ENE lineaments. The relationship of the kimberlite occurrences along the Buffalo High-Buffalo Utikuma terrane boundary and structural lineaments seems to favor an hypothesis of kimberlite emplacement through a major zone of weakness in the basement, here characterized by the boundary between the Buffalo High and Buffalo Utikumaterranes.  相似文献   

东天山白山铼钼矿区燕山期成岩成矿作用同位素年代学证据   总被引：17，自引：2，他引：15  

李华芹  吴华  陈富文  邓刚  杨红梅  杨再峰  梅玉萍  郭敬 《地质学报》2005,79(2):249-255

近年来对东天山地区有色、贵金属矿床成矿年代学研究表明,成矿作用主要发生于海西期—印支期,成矿作用高峰期为晚石炭世—早二叠世。笔者最近对白山铼钼矿区南西1.2 km处出露的黑云母斜长花岗岩和含矿石英脉作了系统的年代学研究,分别获得岩体SHRIMP锆石微区原位U - Pb和谐年龄为181±3Ma(n=13,MSWD=1.10 ) ,含矿石英脉石英的Rb- Sr等时线年龄为187±7Ma(95 %可信度;MSWD=3.5 2 ) ,4 0 Ar- 39Ar坪年龄为182±1.6 Ma,三种不同定年方法所获得的年龄值基本一致,表明东天山地区存在燕山期成岩成矿事件,矿化作用可能与矿区内出露的黑云母斜长花岗岩岩浆活动有关。  相似文献   

江陵地区全新世早期人类活动的孢粉记录   总被引：6，自引：3，他引：3  

谢远云  李长安  王秋良  殷鸿福 《地理科学》2008,28(2):276-281

江陵剖面沉积物孢粉提供全新世早期人类活动的证据。早期人类活动始于6 200 a B.P.,人类大规模活动始于3 400 a B.P.。随着定居点扩大和人类活动加强,地表土壤侵蚀严重,入湖的陆源粗颗粒物质和营养物质增多。湖泊沉积物表现为粗颗粒含量迅速增加,各粒径波动频繁,TOC、TN和C/N的高值以及有机质δ¹³C的低值。2 500 a B.P.以后,沉积环境发生了显著变化,由湖泊及湖沼堆积转化为洪水漫滩堆积,气候变干,人类逐渐撤离该地区。  相似文献   

基于D-S理论的卫星遥感海表面温度和同化数据融合方法     

石绥祥  夏登文  于戈 《海洋学报》2005,27(4):31-37

利用卫星遥感获取海表面温度实时性强,但其数据质量随大气环境而波动;利用同化技术求解的海表面温度局部精度高,但覆盖面与实时性差.鉴于两种技术适应不同情况,拟使用信息融合技术实现两者优势互补,即根据各自的优势和局限性对数据点进行一致性评价和加权融合计算,在提高精度的同时对结果的不确定性进行量化和评价.以我国东部海域海表温度为例的采样试验结果表明,融合法更适应复杂的环境.  相似文献   

影响广西东南部的热带气旋统计特征及登陆地段预报判据   总被引：1，自引：0，他引：1  

彭武坚 《海洋预报》2005,22(2):15-21

通过对1960年～1999年热带气旋影响广西东南部所产生的降水进行天气气候分析,在分析的基础上提出热带气旋登陆地段的预报判据。  相似文献   

毛乌素沙地历史沙漠化过程与人地关系   总被引：4，自引：0，他引：4  

黄银洲  王乃昂  何彤慧  程弘毅  赵力强 《地理科学》2009,29(2)

通过对毛乌素沙地东南缘的一处沉积剖面的粒度分析,揭示该区历史时期的环境变化过程.结果表明:毛乌素沙地历史时期环境一直处于退化之中,主要经历唐中后期和明后期的两次沙漠活化过程.剖面记录的这两次沙漠化与历史文献及考古发现可以相互印证,因此剖面结果对阐释历史文献的记载具有很好的补充作用,同时历史文献也验证了剖面结果的可信性.这两次沙漠活化使毛乌素沙地环境严重退化,尤其是明代后期发生的沙漠化是形成现代地表景观的主要原因.由于此次沙漠化过程与气候过程不一致,因此明末至今的沙漠化与人类活动相关.  相似文献