基于钻孔数据的三维地质建模与可视化研究   总被引：8，自引：1，他引：7  

罗智勇  杨武年 《测绘科学》2008,33(2):130-132

三维地质模型能够完整准确地表达复杂地质现象的边界条件及地质体内含的各种地质构造,直观地再现地质单元的空间展布及其相互关系,最大限度地提高地质分析的直观性和准确性,因此三维地质建模已引起地质、采矿、岩土工程等诸多领域的日益重视。笔者在综合考察多种建模方法的基础上,结合工程实践,提出了一种实用的工程地质三维建模实施方法。该方法以钻孔资料和地质剖面数据为三维地质建模的源数据,允许用户手工修正模型剖面地层分界线,从而实现对建模过程的干预和控制,克服了单纯依靠钻孔数据建模结果不精确且难以修正的问题。最后,通过一个研究实例展示了该方法的实际建模效果。  相似文献   

河南桐柏县破山银矿和银洞坡金矿的硫同位素研究   总被引：1，自引：0，他引：1  

李红梅  魏俊浩  黄祥芝 《现代地质》2008,22(1):18-23

河南桐柏县围山城金银成矿带的破山银矿和银洞坡金矿位于河前庄背斜的轴部和两翼,围岩为歪头山岩组,矿体受地层和构造的双重控制。两个矿床的矿石硫同位素δ34S值变化范围很窄,位于-1.8‰～5.3‰之间,具塔式效应,与围岩的硫同位素组成类似,具有深源硫的特征,由混合总体筛分可推测围岩提供了大部分硫源,破山银矿δ34S∑S为2.8‰左右。同时赋矿围岩的Au、Ag含量远远高于地壳丰度,因此可推断成矿物质主要来源于围岩歪头山岩组。  相似文献   

Helium-argon isotopic tracing for the Pb-Zn-Ag polymetallic ore deposits in the central-south segment of the Da Hinggan Ling Range     

Baode Wang  Shuyin Niu  Aiqun Sun  Huabin Hu  Yaming Liu  Lijun Guo  Shuo Wang 《中国地球化学学报》2008,27(3):235-241

In recent years big strides have been made in the exploration of ores in the central-south segment of the Da Hinggan Ling Range, though some debates still exist on the metallogenesis and sources of ore-forming materials. Pyrite and other sulfides in direct relation to the Pb-Zn-Ag ore deposits were chosen for the He and Ar isotopic analysis of ore-forming fluids, and the first He and Ar isotope data have been obtained from the study region. ^3He/^4He ratios in 14 samples collected from 7 mining districts are 2.17×10^-6-12.52×10^-6, averaging 6.86×10^-6 and their R/Ra ratios are 1.56-9.01 Ra, averaging 4.37 Ra. By projecting the data points onto the ^3He-^4He concentrations diagram, all the points fall near the mantle helium area. The calculated mantle-source helium ratios are within the range of 19.58%-76.96%, with an average of 49.52%. Argon isotopic characteristics are close to those of mantle source, indicating that the ore-forming material was transport upwards via the multi-stage evolution of mantle plume and concentrated as ores in the favorable loci of mantle branch structures.  相似文献   

Zircon M257 ‐ a Homogeneous Natural Reference Material for the Ion Microprobe U‐Pb Analysis of Zircon     

Lutz Nasdala  Wolfgang Hofmeister  Nicholas Norberg  James M. Martinson  Fernando Corfu  Wolfgang Dörr  Sandra L. Kamo  Allen K. Kennedy  Andreas Kronz  Peter W. Reiners  Dirk Frei  Jan Kosler  Yusheng Wan  Jens Götze  Tobias Häger  Alfred Kröner  John W. Valley 《Geostandards and Geoanalytical Research》2008,32(3):247-265

We introduce and propose zircon M257 as a future reference material for the determination of zircon U‐Pb ages by means of secondary ion mass spectrometry. This light brownish, flawless, cut gemstone specimen from Sri Lanka weighed 5.14 g (25.7 carats). Zircon M257 has TIMS‐determined, mean isotopic ratios (2s uncertainties) of 0.09100 ± 0.00003 for ²⁰⁶pb/²³⁸U and 0.7392 ± 0.0003 for ²⁰⁷pb/²³⁵U. Its ²⁰⁶pb/²³⁸U age is 561.3 ± 0.3 Ma (unweighted mean, uncertainty quoted at the 95% confidence level); the U‐Pb system is concordant within uncertainty of decay constants. Zircon M257 contains ～ 840 μg g^?1 U (Th/U ～ 0.27). The material exhibits remarkably low heterogeneity, with a virtual absence of any internal textures even in cathodoluminescence images. The uniform, moderate degree of radiation damage (estimated from the expansion of unit‐cell parameters, broadening of Raman spectral parameters and density) corresponds well, within the “Sri Lankan trends”, with actinide concentrations, U‐Pb age, and the calculated alpha fluence of 1.66 × 10¹⁸ g^?1. This, and a (U+Th)/He age of 419 ± 9 Ma (2s), enables us to exclude any unusual thermal history or heat treatment, which could potentially have affected the retention of radiogenic Pb. The oxygen isotope ratio of this zircon is 13.9%o VSMOW suggesting a metamorphic genesis in a marble or calc‐silicate skarn.  相似文献   

Recommended Values of ²³⁹Pu, ²⁴⁰Pu and ^239+240Pu Concentrations in Reference Material IAEA-315 (Marine Sediment) Estimated by Thermal Ionisation Mass Spectrometry, Inductively Coupled Plasma-Mass Spectrometry and Alpha Spectrometry     

Taeko Shinonaga  Helmuth Aigner  Dilani Klose  Peter Spinder  Heinz Fröschl  David Donohue 《Geostandards and Geoanalytical Research》2008,32(1):93-101

The recommended concentrations of ²³⁹Pu, ²⁴⁰Pu and ^239+240Pu in reference material IAEA‐315 (marine sediment) were estimated by three analytical methods: isotope dilution thermal ionisation mass spectrometry (TIMS), isotope dilution inductively coupled plasma‐mass spectrometry (ICP‐MS) and alpha spectrometry. The determination of ²³⁹Pu and ²⁴⁰Pu (^239+240Pu by alpha spectrometry) was carried out with samples from randomly selected bottles using each method. Plutonium‐238 was also measured by alpha spectrometry. A plutonium‐242 reference material was used as a spike for the quantitative analysis. The influence of ²⁴²Pu in the samples was therefore calculated; however, this contribution was less than the range of uncertainty and did not influence the final results. The obtained data were statistically analysed using variance component analysis and paired comparison. The combined standard uncertainties from “method/measurement”, “bottle” and “sub‐sample” were in the order of 3 to 6%. The main contributions to the uncertainty were from the material heterogeneity and from systematic differences between methods. Based on this study with twenty‐seven analyses using 10–14 g sample mass, concentrations of (38 ± 3) Bq kg^?1, (28 ± 3) Bq kg^?1 and (66 ± 4) Bq kg^?1 are proposed as recommended values for ²³⁹Pu, ²⁴⁰Pu and ^239+240Pu, respectively, and (9.5 ± 0.4) Bq kg^?1 for ²³⁸Pu as an information value in reference material IAEA‐315. In mass concentration units, these amount to (16.4 ± 1.2) ng kg^?1, (3.3 ± 0.4) ng kg^?1 and (0.015 ± 0.003) ng kg^?1 for ²³⁹Pu, ²⁴⁰Pu and ²³⁸Pu, respectively. The certified reference materials NIST 4350B and NIST 4354 were also analysed by TIMS for quality assurance of the method used in this study.  相似文献   

膜分离技术的应用及发展趋势   总被引：8，自引：0，他引：8  

岳志新  马东祝  赵丽娜  赵寒梅 《云南地理环境研究》2006,18(5):52-57

综述世界和中国膜分离技术的发展，并对膜分离技术的基本特性、技术特点、膜材料、分类及膜分离装置进行了简单介绍；并介绍了膜分离法在化工及石油工业、食品工业、医药工业和医疗设备、生物技术和环境工程中的应用，并分析了膜分离技术将会在膜材料、新的膜过程和集成膜过程3个方面的发展趋势。同时指出如果能解决膜产品的价格、膜污染和膜分离性能的提高这3个膜的制约因素，膜分离技术将在人类社会的发展史上起到不可替代的作用。  相似文献   

Determination of total selenium in geological samples by HG-AFS？ After enrichment with thiol cotton fiber     

《中国地球化学学报》2006,25(B08):208-209

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Compressibility and swelling characteristics of Al-Khobar Palygorskite, eastern Saudi Arabia   总被引：1，自引：0，他引：1  

Saad A. Aiban   《Engineering Geology》2006,87(3-4):205-219

Expansive soils are found in different locations in eastern Saudi Arabia. The area is arid with high temperatures, highly variable humidity and an excessive rate of evaporation compared to the low precipitation. This resulted in the formation of water sensitive soils. In the present investigation, line valve buildings for a sweet water feeder (1118 mm in diameter) were constructed on a highly expansive material consisting mainly of brown palygorskite and gray palygorskite with thin sheets of gypsum and limestone. Block samples from both palygorskites were brought to the laboratory and cores as well as remolded samples were obtained from the blocks. The two palygorskites were found to be highly plastic and have a very high swelling potential. The liquid limit (LL) and plastic limit (PL) values for the brown palygorskite are 261% and 140%, respectively. The gray palygorskite has a LL of a 285% and a PL of 123%. The oedometer free swell tests for the two palygorskites produced an expansion ranging between 31.8% and 42.5% for the remolded samples. However, the expansion for cores ranges between 8.3% and 19.3%. The constant volume pressure tests produced a stress in excess of 4240 kPa. The swell potential reached a steady state after four days while the swelling pressure reached a steady state in about 3 h. The paper addresses the geology of the area, the characterization of the geomaterial including mineralogical composition using X-ray diffraction and SEM techniques and the swelling characteristics of the material.  相似文献   

环境矿物材料治理镉（Cd^2＋）污染研究进展   总被引：4，自引：0，他引：4  

商平  王丽娜 《岩石矿物学杂志》2005,24(6):681-685

近年来,环境矿物材料以其经济、有效、无二次污染等特点,在重金属废水处理和土壤修复方面显示出了众多优势,可替代传统的镉污染处理方法。本文综述了国内外环境矿物材料在处理镉污染方面的研究进展,并对今后应用环境矿物材料治理镉污染提出了一些建议。  相似文献   

河南省平顶山盐田盐矿床成矿特征探讨     

姜敏德  沈佩霞 《中国煤田地质》2005,17(4):12-14

以现有钻孔及区域资料为基础，对平顶山盐田盐矿床形成的构造条件和盐湖的沉积模式、沉积类型成矿物源进行了分析，为平顶山盐田的进一步勘查和开发提供了宝贵资料。  相似文献