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矿床预测中的模糊优选法 总被引：1，自引：0，他引：1
模糊优选法是一个模型单元为对象，分别求出各个预测单元与该模型单元的相似度，可得到在成矿环境方面与模型单元最为相似的单元，从而达到划分有利找矿靶区的目的。 相似文献
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浙江土壤矿物组成特征 总被引：5，自引：0，他引：5
对浙江省29种母质和16种土类或亚类构成的69个母质一土类单元共194个土壤样品中的矿物成分进行测定，分析得出矿物种类及矿物百分含量。在此基础上分析了浙江省土壤矿物组成特征。不同土类或亚类土壤中矿物组成存在明显差异，矿物种数和含量变化较大。突出的特征是，相同母质类型土壤含有相似的矿物种类，而且相同母质不同样品中同一矿物含量变化也较小，表现出同母质土壤矿物组成与含量具有相似性。在69个土壤剖面中，由A层到C层矿物种类和含量变化较小，土壤矿物组成明显受基岩影响和控制。宜把地质背景相同、矿物组成相近、土壤环境相似的成土母质作为划分土壤重金属污染评价单元，土壤类型只能作为评价单元的辅助划分依据。 相似文献
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采用复合单元法建立了模拟裂隙多孔介质变饱和流动的数值模型。该模型具有以下特点：裂隙不需要离散成特定单元，而是根据几何位置插入到孔隙基质单元中形成复合单元；在复合单元中，分别建立裂隙流和孔隙基质流的计算方程，二者通过裂隙?基质界面产生联系并整合成复合单元方程；复合单元方程具有和常规有限单元方程相同的格式，因此，可以使用常规有限单元方程的求解技术。采用欠松弛迭代、集中质量矩阵以及自适应时步调节等技术，开发了裂隙多孔介质变饱和流动计算程序。通过模拟一维干土入渗和复杂裂隙含水层内的流动问题，验证了该模型的合理性和适用性。模拟结果为进一步认识非饱和裂隙含水层地下水流动特性提供了理论依据。 相似文献
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为了弄清选沙相似律对动床模型沙波相似性的影响,开展基于起动相似等3种不同相似律选择模型沙的沙波水槽试验。基于试验观测的沙波波高、波长以及沙波不同部位的水深、流速,对比分析了沙波尺度及其随水流强度变化过程的相似性。结果表明:当模型沙重率、形状与原型沙相同时,满足起动相似的模型沙沙波尺度与原型相似性最高,满足悬浮相似模型沙的沙波整体偏高、偏长,兼顾起动与悬浮相似的模型沙介于两者之间;不同选沙相似律不影响沙波波高、波长随相对水流强度的变化规律,满足不同相似律的模型沙沙波波高均在相同的相对水流强度达到最大值,波长随相对水流强度增大而增大。说明偏离起动相似越少,沙波相似程度越高。 相似文献
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提出水文计算中相似流域选择的模糊集模型与方法,以改进水文计算中选择相似流域的经验性方法.原则上模型也可用于其他水文相似问题. 相似文献
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在MapGIS的基础上对矿产资源评价系统进行系统需求研究,总结出矿产资源评价信息系统的总体结构,给出了矿产资源评价中经常用来解决资源量的定位问题的数学模型——矿床定位预测特征分析模型,并对矿产资源评价系统进行了结构设计。 相似文献
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给出了综合信息矿产预测的层次结构模型。本模型对不同工区的研究可提供一种良好的结构。层次分析法的使用，不仅对不同类型、不同层次的各种控矿因素和找矿标志进行了定性和定量分析，促进对找矿规律的认识，而且还对工区的矿产资源量大小做出评价，从而指导有效的矿产勘查。该方法在浙江火山岩区资源总量预测中，取得了满意的效果。 相似文献
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断层运动是复杂多变的, 其运动在一条巨大的断裂带上经常以区段为活动单位, 为服务于工程建设和强震的预测, 划分出活断层运动区段的必要性越来越迫切。本文通过对香山天景山断裂带断层泥的微观特征研究, 结合断裂的几何特征综合分析, 认为该断裂的中段以粘滑活动为主, 东西两段主要是蠕滑。 相似文献
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Fuzzy logic mineral prospectivity modelling was performed to identify camp-scale areas in western Victoria with an elevated potential for hydrothermal-remobilised nickel mineralisation. This prospectivity analysis was based on a conceptual mineral system model defined for a group of hydrothermal nickel deposits geologically similar to the Avebury deposit in Tasmania. The critical components of the conceptual model were translated into regional spatial predictor maps combined using a fuzzy inference system. Applying additional criteria of land use restrictions and depth of post-mineralisation cover, downgrading the exploration potential of the areas within national parks or with thick barren cover, allowed the identification of just a few potentially viable exploration targets, in the south of the Grampians-Stavely and Glenelg zones. Uncertainties of geological interpretations and parameters of the conceptual mineral system model were explicitly defined and propagated to the final prospectivity model by applying Monte Carlo simulations to the fuzzy inference system. Modelling uncertainty provides additional information which can assist in a further risk analysis for exploration decision making. 相似文献
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介绍了用地理信息系统进行综合信息矿产资源预测的方法，以及一些特殊问题的处理“定量数据库”的建立等。 相似文献
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针对人们对矿产资源管理要求的不断提高,而传统矿产资源管理系统只局限于矿政管理而不能很好地为地质科研工作服务的问题,利用MapInfo 8.0为GIS平台,Visual Basic为开发语言进行二次开发,研制了以地质科研为目的、基于GIS的矿产资源管理系统,它从地质科研人员的工作角度出发,为矿产资源预测、开采及其他各方面科研工作提供信息。 相似文献
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Although crucial for the construction of tectonic models of the Alps the timing of high pressure metamorphism is still poorly determined and controversial. It is likely to vary from one tectonic unit to another depending on when each became involved in subduction. This in turn relates to palaeogeographic position with respect to the active ocean basin. Well defined, reliable geochronological data are too few to test this hypothesis. This paper extends the database by determining Sm–Nd mineral isochrons on two samples from the Monviso Ophiolite in the Piemonte Zone, carefully selected to minimize the problems of Sm–Nd dating of eclogites encountered elsewhere in the Alps. The dated samples have eclogite facies mineral assemblages typical of the Lago Superiore unit of the ophiolite; mineral compositions are similar to previously reported samples and indicate pressures of around 2 GPa and temperatures of 400–500 °C. Sm–Nd isochron ages of 60±12 and 62±9 Ma are defined by garnet and clinopyroxene, while the Rb–Sr age on phengite which is part of the high- P assemblage is 40±1 Ma. The new data fit an emerging pattern of ages in which high- P metamorphism in the oceanic realm is Early Tertiary, with slightly older ages in the overlying Sesia Zone and younger, Oligocene ages in the underlying internal basement massifs which only became involved in subduction when closure of the Piemont ocean was complete. 相似文献
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Hu Wangliang Lu RuiyingDepartment of Mathematical Geology China University of Geosciences Beijing Gao Huaizhong Zhang WangshengInstitute of Geology Mineral Resources of Xinjiang China University of Geosciences Wuhan 《中国地质大学学报(英文版)》1995,(2)
The system of mineral deposit statistical prediction methods, based on the similarity-analogy theory, searching anomaly theory and the theory of ore-controlling by quantitative assemblage of metallotects, can he summarized into the following aspects: (1)concluding main ore-controlling conditions and ore-hunting indicators from typical deposits; (2)establishing geological concept model of deposits; (3)selecting geological variable and dividing study units and granting specific value for each variable; (4)by the use of geological and mathematical geology method, building predication model , delineating prospective area for exploration and estimating the total resources; (5)evaluating the prospecting work . It is good practice to use this system for metallogenic prognosis and regional prospecting of gold deposit in East Junggar, Xinjiang and has achieved great success . As a result, we discovered the Kubusu gold mineralized belt , delineated prospective area , estimated total resources of gold in the belt a 相似文献