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31.
Renguang Zuo Frederik P. Agterberg Qiuming Cheng Lingqing Yao 《International Journal of Applied Earth Observation and Geoinformation》2009
Geological point processes can be used to model point patterns occurring frequently in a wide variety of geoscience fields, including the study of mineral deposits, oil producing wells, earthquakes, and landslides. Characterization of the spatial distribution of GPP has implications for understanding the properties of the underlying geological processes and events. Three examples of GPP dealing with (1) metallic mineral deposits, (2) oil producing wells, and (3) aftershocks of the Wenchuan earthquake (on 12 May 2008, magnitude 8.0) are presented to illustrate that (1) the spatial distribution of geological point processes generally shows clustering implying rejection of the Poisson model because L(r) > LPois(r); (2) the clustering statistics of the underlying geological processes are fractal; and (3) the size distribution of geological point processes is scale invariant. These results indicate existence of a fundamental law concerning the fractal nature of the point distributions generated by geological point processes. 相似文献
32.
Chemical and bacterial reduction and dissolution of Fe and Mn-oxide and the concomitant solubilisation of Co and Ni were studied in a surface horizon of a New-Caledonia Ferralsol. Chemical extractions showed that Mn and Co were in a large part associated in Mn-oxides. The main part of Ni was associated with goethite, but a very small fraction was also associated with Mn-oxides. Anaerobic reducing bacterial activity was responsible for Fe solubilisation at a smaller extent than for Mn solubilisation and consequently for associated metal release. Submicroscopic investigations revealed the presence of a Mn-oxide containing Co, Ni and Al, close to a lithiophorite–asbolane mixed-layers Mn-oxide, which can be considered as a main source of easily available metals in this soil. To cite this article: C. Quantin et al., C. R. Geoscience 334 (2002) 273–278. 相似文献
33.
Sébastien Garnaud Patrick Lesueur Sandric Lesourd Nicole Poupinet Jean-Claude Brun-Cottan 《Comptes Rendus Geoscience》2002,334(5):323-330
This paper presents the first results obtained during cruises since 1995 in the southeastern part of the Bay of Seine. New sedimentological data concerning sediment samples, box cores and water column measurements have been obtained recently in the framework of the Research Programme PNEC (French National Coastal Environment Programme). Fine sediments are deposited on form of temporary veneers of fluid-to-soft mud formed during high floods episodes. In the subtidal area (<10 m water depth), mobility of fine sediments is important and temporary mud deposited during high discharge period composes part of the distal estuarine system of the Seine River. To cite this article: S. Garnaud et al., C. R. Geoscience 334 (2002) 323–330. 相似文献
34.
Alain Blot 《Comptes Rendus Geoscience》2002,334(12):909-915
There are many small ferruginous outcrops of different facies, often breccia-like, in the Neoproterozoic sedimentary formations in northern Burkina. These outcrops are made up of goethite and quartz, and are often along with high grades of various elements. It could be a question of gossans. Their large distribution in this part of the Taoudéni Basin offers it prospects as a province geochemically rich in Cu, Pb, Zn, Mo, As, Cd, Co... This basin would be a geochemical bin for ancient formations, which would have been evacuated before the Neoproterozoic. The ironstones would be the mark of further concentrations. To cite this article: A. Blot, C. R. Geoscience 334 (2002) 909–915. 相似文献
35.
In the methods used for determination of the hydraulic behaviour at large scale of fractured rock masses, based on the simulation of flow in a fracture network, the mean flux and the mean pressure gradient in the network are not rigorously determined. A method is given for deriving these quantities, in a heterogeneous permeable block, from pressure and flux values on the boundary of the block. A block conductivity tensor is then defined, based on the condition of linear variation of the pressure on the boundary of the block. It is shown that this conductivity tensor is symmetric and positive-definite. An example of application to a model of fractured medium is given. To cite this article: A. Pouya, A. Courtois, C. R. Geoscience 334 (2002) 975–979. 相似文献
36.
徐州是我国历史文化名城之一，交通便利，景点众多，具有广阔的旅游发展前景。徐州旅游景点的基础大多与地质学有关，山，水，洞，石及地学人文资源分布广泛，内容丰富，独具特色。试从地学角度阐述徐州旅游资源的概况，分区，并提出进一步开发利用的建议。 相似文献
37.
3D GIS与3D GMS中的空间构模技术 总被引：74，自引：12，他引：62
3DGIS和3DGMS是近10年来地学领域并行发展的两大领域,该文从研究对象,数据来源,空间参照,空间构模,拓扑描述,空间量算,空间分析及应用领域等方面分析了3DGIS和3DGMS异同,并从数学模型,高程特征,属性特征和构建方式等方面讨论并重新界定了空间维数问题,重点分析了空间构模技术,将3D GIS和3D GMS中的空间构模分为基于面模型,基于体模型和混合构模3大类,并进行了分析比较和讨论,指出3D GIS和3D GMS将殊途同归,并最终建立全要素的真3D地球信息系统。 相似文献
38.
数学地质或者数学地球科学作为一门自然科学与地球科学的交叉学科,长期以来缺乏统一的学科定义,导致了学界对该门学科的理解常常出现偏差,甚至常常不把其作为一门独立学科,一定程度上影响了学科的发展。笔者曾任国际数学地球科学学会的执行主席、副主席、主席十余年,见证和领导了国际数学地球科学学会从数学地质向数学地球科学的转变,以及学会相关的杂志、会议等名称和内容的更新。期间于2014年在学会年度报告中提出了数学地球科学的新定义和学科内涵,2018年在庆祝学会50周年的数学地球科学手册中详细论述了数学地球科学学科的定义、内涵、贡献和前缘等。本文将在以上数学地球科学新的学科体系框架下探讨数学地球科学的主要贡献、科学进展、学科前缘和科普教育。在回顾学科发展历史的基础上分析了数学地球科学与数学地质学的差异,介绍了数学地球科学在大地测量和地球物理学、板块构造理论、地球化学、沉积学、地理信息系统、矿产资源和能源预测等领域的重要贡献。从国际地球科学前缘方向分析了数学地球科学的学科前缘,介绍了定量研究地球复杂性、大数据-深度机器学习与复杂人工智能等新的学科增长点。回答诸如什么是数学地球科学?数学地球科学家对地球科学的贡献?数学地球科学是否处在地学前缘等问题。 相似文献