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   

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

  相似文献   

天然磁铁矿中方铁矿的调制结构及畴结构     

王岩国  郭九皋 《矿物学报》1994,14(2):147-151,T003

用高分辨电子显微术研究了攀枝花磁铁矿的超微结构，选区电子衍射量显示有方铁矿共生，并且方铁矿中有调制结构，周期约为方铁矿晶胞的２．６倍，具有一维非公度特征。［００１］取向的结构象也清楚地显示该调制结构，磁铁矿还含有丰富的畴结构，畴界面分基面和非基面两类，有方铁矿与畴结构共生，对这些微结构的成因进行了讨论。  相似文献   

磁铁矿中出溶与缺陷结构的高分辨电镜研究     

王岩国  西门露露 《矿物学报》1990,10(1):8-14,T002,T003

利用高分辨电镜对四川攀枝花富含钒、钛的磁铁矿的精细结构进行了研究，[110]方向的高分辨像清楚地显示了磁铁矿与钒磁铁矿沿[110]方向的波状紧密连生，在两相界面处和钒磁铁矿中观察到了反相畴结构及与元素间化学比有关的各种层措，并对其成因进行了讨论。  相似文献   

PbO中层错及共生氧化物的电子显微术研究     

王岩国  郭九皋 《矿物学报》1996,16(4):358-364,T002

在含于磁铁矿中的四方对称结构氧化铅中观察到柏格斯矢量为２／１１（３１０）的（１１）层错，这些层错平行排列并相互交截，穿插形成沿（１００）方向的调制结构，调制波的平均波长约为１００ｎｍ同时，由多相关性区域的选区电子衍射图测定了磁铁矿中四方和正交氧化铅及方铁矿的取向关系。  相似文献   

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   

断层富水性的综合探测技术与应用   总被引：2，自引：0，他引：2  

杨文钦  胡东祥 《煤田地质与勘探》2002,30(2):51-53

济宁二号煤矿33下06工作面平行井田边界孙氏店大断层布置，由于奥灰与煤层“对接”，从而对工作面的安全开采构成潜在威胁。利用三极测深法，瞬变电磁法和无线电坑透法等综合物探技术，查明了边界断层的富水性及其对33下06面的影响，为工作面安全生产提供了可靠的地质资料。  相似文献   

华北太原组镜质组中的超微类脂体及其煤性质异常原因   总被引：1，自引：0，他引：1  

王飞宇  傅家谟 《沉积学报》1995,13(3):107-116

利用超薄切片透射电镜分析技术，对华北太原组和山西组煤中镜质组的超微结构和组分进行了分析，确认太原组镜质组中含有较丰富的超微类脂体，且超微类脂体主要来自菌藻类，山西组和太原组镜质组中超微类脂体数量存在明显差异。证实镜质体中超微类脂体数量和其化学性质紧密相关。从超微组分层次解释了山西组和太原组镜质组性质差异的原因，并分析讨论了太原组煤性质异常性的原因和煤还原程度问题，提出成煤过程中明显菌藻类低等生物贡献是太原组煤性质异常的一个重要原因。  相似文献