瞬变电磁法、时间域激电法在勐兴铅锌矿的应用   总被引：2，自引：0，他引：2  

罗鉴凡  廖忠 《云南地质》2002,21(4):421-427

勐兴铅锌矿矿石品位低，埋深大，且面临资源匮竭。采用瞬变电磁法（TEM）和激电法（IP），合理布线展网，反复印证，得到多个物探组合异常。异常源位于下志留统下仁和桥组。经钻孔验证，获得相当于原保有储量3倍的新储量，找矿效果突出。  相似文献   

瞬变电磁法在腾冲寻找地热中的应用   总被引：4，自引：0，他引：4  

李文尧  廖忠 《物探与化探》2002,26(5):368-371

腾冲地热资源丰富,但热储深度大,为寻找并开发地热,选择瞬变电磁法线源装置开展工作,工作结果获得明显TEM异常,经钻探验证,在1000多m深处发现热储层。  相似文献   

利用TEM测深校正MT静态偏移的技术问题   总被引：4，自引：0，他引：4       下载免费PDF全文

姚治龙  王庆乙  胡玉平  刘俊昌 《地震地质》2001,23(2):257-263

由近地表电性不均匀体引起的静态偏移严重地影响了MT资料解释的质量。研究表明 ,利用时间域电磁测深 (TEM )可以有效地解决这个问题。重点讨论了利用TEM做MT静改时需要解决的 3个技术问题 ,并以实例说明了应用效果  相似文献   

瞬变电磁法衰减电压曲线编辑程序简介     

张保祥  刘春华 《物探化探计算技术》2001,23(1):77-80

瞬变电磁法蝗测量资料在整理前通常先进行滤波处理，一般采用三点自相关滤波公式进行，但效果往往不理想。我们利用VB语言编制了手动滤波程序，操作简便，应用效果很好。  相似文献   

圣水峪辉绿泥石中多型的体衍生     

罗谷风  王玉华  薛纪越  张富生 《矿物学报》2001,21(3):295-298

根据透射电镜观察 ,在采自山东省泗水县圣水峪并作为镁普通角闪石之蚀变产物的辉绿泥石(K0 .0 1Na0 .0 1Ca0 .0 2 Mn0 .0 1Fe1.82 Mg2 .6 1Cr0 .0 4Al1.30 ) [Al0 .88Si3.12 O10 ](OH) 8中 ,发现了由两种不同的绿泥石规则一层多型所构成的体衍生现象。确认其中一种为α =12 0°的Ⅰb 3或Ⅱab 4多型 ,另一种为未确定的某种多型 (α =90°)。两者间的三维相互取向关系为 ,彼此的c 轴完全一致 ,a轴和b轴也都对应地两两相互平行 ;同时还有它们的 ( 0 0 1)面网间距d(0 0 1) 彼此相等。  相似文献   

N型氮化镓的结构和光电导特性     

艾子萍  刘云燕等 《岩矿测试》2001,20(3):195-198

采用透射电镜高分辨反射电子衍射，扫描电镜形貌观察，X射线衍射等不同方法测试了不同Mg含量的N型氮化镓薄膜的结构。几种测定方法的比较表明，高分辨反射电子衍射是确定厚衬底的薄膜结构的快速而简便的方法，材料的杂质和缺陷是影响其光电导性质的重要因素。  相似文献   

The application of the transient electromagnetic method in hydrogeophysical surveys   总被引：3，自引：0，他引：3  

Jens E. Danielsen  Esben Auken  Flemming Jrgensen  Verner Sndergaard  Kurt I. Srensen 《Journal of Applied Geophysics》2003,53(4):181

The transient electromagnetic (TEM) method has been used extensively for hydrogeophysical exploration in Denmark for the past decade. Innovative instrumentation combined with multi-dimensional modelling and interpretational insights based on experience gained through numerous case studies have proven to be a successful strategy. In the case study reported here, the combination revealed an unknown and unexpected buried valley complex. Drill hole data were in good agreement with estimates of both the bearings and depths of valleys defined by the TEM surveys. The Pulled Array Transient Electromagnetic (PATEM) system was built to provide high data density for increased lateral resolution. A High moment Transient Electromagnetic (HiTEM) system was developed for delineation of aquifers to depths up to 300 m. Because both of these systems provide high data density, data quality can be assessed as part of the interpretational strategy. When acquiring TEM measurements in areas as densely populated as the Danish countryside, precautions must be taken to minimize coupling between the TEM system and man-made conductors. Modelling the slope of the flanks of buried valleys has challenged the adequacy of the one-dimensional (1-D) assumption for inversion of TEM data. The study shows that for a valley structure in a low-resistive layer, the 1-D assumption is sufficient to track the presence of rather steep slopes. For a valley structure in a high-resistive layer, however, the insensitivity of the TEM method to resistors makes it difficult to determine a slope with a 1-D inversion, and only the overall structure is defined.  相似文献   

An XRD, TEM and Raman study of experimentally annealed natural monazite   总被引：1，自引：0，他引：1  

A. M. Seydoux-Guillaume  R. Wirth  L. Nasdala  M. Gottschalk  J. M. Montel  W. Heinrich 《Physics and Chemistry of Minerals》2002,29(4):240-253

 The healing of radiation damage in natural monazite has been experimentally studied in annealing experiments using XRD, TEM, Raman microprobe and cathodoluminescence analysis. The starting material was a chemically homogeneous monazite from a Brazilian pegmatite with a concordant U–Pb age of 474 ± 1 Ma and a U–Th/He age of 479 Ma. The monazite shows nm-scale defects induced by radioactive decay. The X-ray pattern of the unheated starting material revealed two distinct monazite “phases” A and B with slightly different lattice parameters. Monazite A shows sharp reflections of high amplitudes and slightly expanded lattice parameters (1% in volume) compared to a standard monazite. Phase B exhibits very broad reflections of low amplitudes. Two sets of experiments were performed. First, dry monazite powder was annealed at 500, 800 and 1000 °C for 7 days. Each run product was analysed by X-ray diffractometry. Second, monazite grains were hydrothermally annealed at temperatures from 500 to 1200 °C for 5 to 15 days. TEM observations show that partial healing of the monazite lattice already occurred at 500 °C and increased gradually with temperature, so that after 10 days at 900 °C complete healing was achieved. The observations are interpreted accordingly: the starting material has a mosaic structure consisting of two domains, A and B, which are basically two monazite crystals with different lattice parameters. We suggest that the A domains correspond to well-crystallised areas where helium atoms are trapped. The accumulation of He causes expansion of the A monazite lattice. Diffraction domains B are interpreted as a helium-free distorted monazite crystal lattice, which can be referred to old alpha-recoil tracks. These B domains are composed of “islands” with an expanded lattice, induced by the presence of interstitials, and “islands” of a compressed monazite lattice, induced by presence of vacancies. Both the islands will pose stress on the lattice in the vicinity of the islands. The broadening of the B reflections is due to the expanded or compressed diffraction domains and to the different amount of the distortion. With increasing temperature the unit-cell volume of monazite A decreases, i.e. the position of the A reflections shifts towards smaller d _hkl values. This was interpreted as a relaxation of the monazite lattice due to helium diffusion out of the monazite lattice. Simultaneously, the nm-sized defect domains B are healed. At 900–1000 °C only a monazite with well-crystallised lattice and minimum unit-cell volume is observed. Received: 7 May 2001 / Accepted: 11 October 2001  相似文献   

Quantification of ferrous/ferric ratios in minerals: new evaluation schemes of Fe L 23 electron energy-loss near-edge spectra   总被引：1，自引：0，他引：1  

P. A. van Aken  B. Liebscher 《Physics and Chemistry of Minerals》2002,29(3):188-200

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电磁学中的某些进展与电磁法的有关问题     

徐义贤 《地球物理学进展》1996,11(1):88-96

本文介绍了电磁学研究热点中与电磁脉冲有关的瞬变电磁场（ＴＥＭＦ）、Ｍａｘｗｅｌｌ方程组的瞬态解等方面的最新进展，对各界瞩目的电磁导弹（ＥＭＭ）问题做了较详细评述，对ＴＥＭＦ的求解方法做了简要总结，并着重介绍了一种适于任意媒质，高维情况下的广义时域有限差分算法（ＧＦＤＴＤ）；通过引入手征媒质中电磁场的本构方程，证明了电磁波在地中传播时，源电极化和源磁极化之间存在耦合关系，这种耦合作用的结果总是程度不  相似文献