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复电阻率法在国外已有三十多年的历史。首先是“变频法”,接着是“相位激电法”,现今已综合发展成以测量振幅和相位谱为主的“频谱激电法”。目前,国外在实验室和野外研究的基础上,正致力于把频谱激电法推进到野外实际调查中去。加拿大凤凰物探公司新近制造的商售IPV-3系统就是专为推进频谱激电法而设计的。 相似文献
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本文提出激发极化差异效应和激电差的概念并给出定义,首次使用“差异激电法”这一述语。通过在平原和山区的贫水及富水区的应用以及室内金属板、石墨板和金属矿物、炭质岩石标本的水槽模拟实验,说明基于激发极化差异效应的差异激电法在探查地下水以及找矿、区分矿种方面的有效性,初步探索了异常反映规律。 相似文献
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为了定量地探讨激发极化法在水平地层上出现的激电负效应和超正(或峰值增强)效应,本文以三层断面为例,采用“临界电阻率法”和“稀释系数法”对其产生条件、作用范围、作用强度等内容及各种影响因素进行了较全面、系统的研究,给出了有意义的判断准则和若干有价值的规律.为了证明激电负效应的客观性和理论分析的正确性,文中还给出了有关模型实验结果. 相似文献
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本文主要论述复杂条件下垂向电测探工作中的一些问题,尤其是在“非无限水平展状均匀介质”,例如在金属矿、岩溶地区等“有限电性体”上开展垂向电测深时的一些解释方法。还介绍了一些“有限电性体”在ρ0断面等值线图上的异常特征和野外实验。对ρ0断面等值线图的编绘方法也进行了讨论。 相似文献
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我国勘查地球物理的若干进展——1991年 总被引:1,自引:0,他引:1
1991年是我国“八五”计划第一年。一批新的勘查地球物理科研项目通过论证立项开始实施。相对于“七五”末期的前两年。1991年完成的科技成果较少。航空和海洋地球物理勘查、油气地震、区域重力的队伍规模和1990年相近,完成的工作量略有增加。地面电法和浅层地震有较多新仪器推出,它们大多是近年投产仪器的改进提高,显示了加速更新的良好趋势。大型地震、测井仪器系统1990年刚有较多新品投产,1991年尚少新的成果。地球物理方法在油气和煤田开发阶段的应用受到更大重视,在工程勘查和环境调查领域中的应用继续发展,“陆地声纳”等新方法开始在工程勘查中使用。各种新的处理解释方法、软件及系统不断形成,并进一步向多种方法资料联合处理解释方向发展。 相似文献
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电法勘探中“双极-偶极”装置的某些特点 总被引:1,自引:0,他引:1
本文通过对球体上ρs与ηs异常及观测信号的理论计算,阐明了“双极-偶极”装置的异常特征以及“双极- 偶极”较“偶极-偶极”装置在增大观测信号、节约电源方面的主要优点.并由计算提出“临界AB/MN值”的概念,为实际工作中双极距AB的选择提供了理论依据. 相似文献
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本文的基本观点是:地质矿产部的固体矿产电法勘探既要搞矿产的普、详查,又要搞远景区的中比例尺区域地质调查。因此既要使用所谓常规的金属矿电法,又要采用某些所谓构造电法。在实际应用中既要积极采用新方法,又要灵活运用各种现成的“老”方法,在立足我国国情和吸收国外先进技术经验的前提下,分两步发展我国自己的固体矿产电法技术。 相似文献
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研究了土壤地球化学、土壤电导率和土壤元素活动态测量在内蒙古新巴尔虎右旗干旱-半干旱草原覆盖区的应用效果,圈出3处土壤地球化学综合异常,3处土壤电导率异常和1处土壤元素活动态综合异常,各异常在研究区对应的位置均有不同程度的套和。通过对比研究得出,利用土壤地球化学、土壤电导率和土壤元素活动态测量相结合的集成方法可以取得更好、更快的找矿效果;三种方法可以相互印证异常;土壤元素活动态测量,能够进一步强化异常。文中所用的方法和取得的一些认识,对内蒙古新巴尔虎右旗地区乃至其它草原覆盖区的地质找矿工作,具有一定的指导意义。 相似文献
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金矿化作用伴围岩蚀变,且多受断裂控制,反映在地球化学上出现某些元素的异常。在已发现一害矿化体并掌握一般控制矿特征的地区,利用已有工程在蚀变带内连续捡块采样,分析有关批示元素,总结有关的地球化学指标,建立地球化学预测模式,对已知矿体及外围异常进行了地球化学评价。 相似文献
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内蒙古东珺铅锌银 矿床的发现——地物化综合找矿勘查方法的运用 总被引:4,自引:0,他引:4
文章介绍了运用以地质为基础、地物化相结合的综合找矿勘查方法,发现内蒙古东珺铅锌银矿床的过程.通过地质、地球化学和地球物理方法进行找矿勘查,总结出适用于草原和森林景观区浅覆盖-隐伏矿床(体)的勘查流程为:路线地质→大比例尺地质测量和地球化学测量→大比例尺地球物理测量→工程验证;提出基本吻合的1:1万物化探异常可以定位预测隐伏铅锌银矿(化)体,甚低频电磁法和激发极化法对受断裂构造控制的浅覆盖和隐伏脉状铅锌银矿的定位预测是行之有效的地球物理勘查技术方法.根据大比例尺地、物、化示矿信息特征,给出了产于中牛代火山岩中的热液脉状铅锌银矿的找矿标志. 相似文献
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吉林省敦化尔站矿区位于吉黑东部多金属成矿带中南部,以往资料表明有Mo、Cu等元素地球化学异常和斑岩体存在。为查明该区成矿条件,明确勘探思路,开展了水系沉积物、土壤元素地球化学和地物化综合剖面测量工作。通过对各元素分布、相关性和异常特征研究,发现水系和土壤地球化学异常具有较好重现性,R型聚类分析表明Mo与As、W元素相关性较好,主成矿元素为Mo元素,在地球化学高异常和低阻高极化率区域进行异常查证,发现钼矿体6条。钼矿体产于晚二叠世蚀变似斑状二长花岗岩体及其与围岩接触带,主要受北东向构造带控制,Mo和As等元素地球化学异常与矿体和蚀变带的辉钼矿、黄铁矿等关系密切。综合分析尔站矿区成矿地质条件,在已发现矿体北东和南东圈定靶区2个,区域上含前寒武系残片呈北东向展布的晚古生代花岗岩区是重点找矿地段。 相似文献
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Three periods in the development of geochemical methods for ore prospecting in Bulgaria may be distinguished — initial (1954–1960), middle (1961–1969) and contemporary (since 1970) — which are characterized by successively increasing numbers of samples and improving methods of geochemical data evaluation. Geochemical methods have been recognized as effective, rapid and relatively cheap methods for prospecting for ore deposits (Cu, Pb, Zn, Au, W, Mo, etc.), some nonmetalliferrous raw materials (fluorite, barite, phosphorites) and hydrocarbons. They are used in all stages of exploration at scales from 1:200,000 to 1:200. They have contributed to the elucidation of the ore perspectives in many regions, and a number of new ore bodies and deposits have been discovered.Basic geochemical methods applied to ore prospecting in the country utilize soil and rock to detect secondary and primary aureoles. Stream-sediment surveys, hydrochemical and atmochemical methods are of more restricted use. Samples are analyzed by emission spectrometry, atomic absorption and other methods. A united system of computerized processing of geochemical data has been developed, including automatic drawing of geochemical maps.Interpretation of the data consists in selection of prospective geochemical anomalies and prognostication of the composition, morphology, depth and industrial significance of hidden ore bodies. The main problem in the mathematical processing of data is the presentation of polydimensional results from analyses in the form of generalized quantities — multiplicative or additive geochemical indicator ratios for the type of mineralization, coefficients of zoning, intensity, etc. The geochemical indices for evaluation of the newly found anomalies are derived through studies of the primary geochemical aureoles of typical standard ore deposits.Residual secondary soil aureoles in most cases are well correlated in composition and structure with the ore bodies and primary aureoles which have generated them. Their successful use is related to the landscape-geochemical conditions in the ore regions. Micro- and macro-chemical zoning of ground waters and different concentration of soluble components in different elevation belts are used for evaluation of hydrochemical anomalies. 相似文献
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《Chemie der Erde / Geochemistry》2021,81(4):125829
The Yunnan-Guizhou-Guangxi region is well known for its abundant mineral resources, and low-temperature hydrothermal mineralization represented by the elemental association of gold, arsenic, antimony and mercury is widely developed there. Many studies on the geological-geochemical characteristics of gold have been conducted, but a comprehensive understanding of the antimony geochemical pattern is still lacking. This paper studied the Sb distribution characteristics and the cause of geochemical anomalies based on the geochemical data of stream sediments and rocks in the study area. In addition, the geochemical data of Au, As, Sb and Hg were centered and log-ratio transformed to eliminate the closure effect, and then random forest regression (RFR) with Au, As and Hg as the characteristic variables was used to investigate the ore-related geochemical anomalies of Sb. Seven geochemical provinces were delineated from the original geochemical data, and they are not entirely consistent with the known deposits. Sb moves from the rocks to the stream sediments during weathering. The variation trend in the Sb background values in stream sediments in each tectonic unit is consistent with that in the rocks themselves, implying that Sb in the stream sediments is inherited from the background rocks. The distributions of Sb predicted by RFR are similar to the distribution pattern of Sb in stream sediments. Of the three elements considered, the influence of As on the variations in the Sb geochemical background is the greatest, followed by Au and then Hg. The geochemical anomalies extracted by the residuals produced in this algorithm are consistent with where the known Sb metallogenic district is located, indicating that this method of recognizing geochemical anomalies is feasible and effective and has theoretical and practical significance. 相似文献