基于Kriging和Marching cube算法的地学3维形态模拟

地质构造的复杂性和勘查数据的不完备性,决定了对地质要素(地质体和场)的空间形态进行3维模拟是一个面临众多技术难题的艰巨任务。针对此问题,探讨了一种利用空间插值和等值面勾绘来建立地质要素的接近真实的3维可视化模型的方法。Kriging算法,由于其在揭示空间数据非均匀、各向异性分布规律方面具有良好表现,因而被用于对不完备地学数据进行空间插值,即先将分散的不规则分布的数据转换成规则分布的网格数据;再通过Marching cube算法实现由网格离散点构建光滑3维等值曲面;最后通过OpenGL接口实现等值曲面的计算机3维重绘。整个过程采用VC .net结合OpenGL编程完成。应用这种方法,可实现有限钻孔取样分析数据的矿体品位3维等值面模拟和电磁测深2维反演数据的电阻率3维等值面模拟,其模拟结果接近于传统勘探方法解释的结果,而且其效率高得多,也更加直观,证明此方法是有效的和实用的。     

Key strategies for predictive exploration in mature environment, model innovation, exploration technology optimization and information integration

Prediction has become more and more difficult in mineral exploration, especially in the mature exploration environment such as Tongling copper district. For enhancing predictive discovery of hidden ore deposits in such mature environment, the key strategies which should be adopted include the innovation of the exploration models, application of the advanced exploration techniques and integration of multiple sets of information. The innovation of the exploration models should incorporate the new metallogenic concepts that are based on the geodynamic anatomization. The advanced techniques applied in the mature exploration environment should aim at the speciality and complexity of the geological setting and working environments. The information synthesis is to integrate multiple sets of data for giving a more credible and visual prospectivity map by using the geographic imformation system(GIS) and several mathematical methods, such as weight of evidence and fuzzy logic, which can extract useful information from every set of data as much as possible. Guided by these strategies, a predictive exploration in Fenghuangshan ore field of Tongling copper district was implemented, and a hidden ore deposit was discovered.     

ETM+遥感数据的构造、岩石和蚀变信息提取及其在甘肃北山西段的应用

甘肃北山地区是我国西北地区重要的多金属成矿带,气候干燥,植被稀少,很适合遥感工作的进行.作者以Landsat-7的ETM+影像为遥感数据信息源,讲述了卫星遥感技术在北山西段瓜州地区地质构造解译和矿化蚀变信息提取中的运用.     

Potential mechanisms of pore-fluid movement from continental lithospheric mantle into upper continental crust

Through integrating the state of the art scientific knowledge in different research fields, some potential mechanisms of large-scale movements of underground pore-fluids such as H2O and CO2 in the continental lithosphere were presented and discussed. The results show that the generation and propagation of porosity waves are important mechanisms to transport mass and heat fluxes from the continental lithospheric mantle into the lower continental crust; the generation and propagation of porosity waves, pore-fluid flow focusing through lower and middle crustal faults, advection of pore-fluids through the lower and middle crust, and whole-crust convection in some particular cases are important mechanisms to transport mass and heat fluxes from the lower into the upper continental crust; heat and mass transport through convective pore-fluid flow is the most effective mechanism of ore body formation and mineralization in hydrothermal systems; due to heat and mass exchange at the interface between the earth surface, hydrosphere and atmosphere, it is very important to consider the hydro-geological effect of the deep earth pore-fluids such as H2O and CO2 on the global warming and climate change in future investigations.     

Approaches to location prognosis of concealed ore deposits （bodies） of productive mines

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中条山地区地壳递进演化与胡—篦型铜矿床的成因

１　大地构造背景及区域地壳演化史中条山地区出露的主要地层为早中太古代的涑水杂岩、晚太古代的绛县群、早元古代的中条群和担山石群、中晚元古代的西洋河群和汝阳群等。其中铜矿的含矿岩系主要是绛县群和中条群,胡—篦型银矿床都赋存在中条群中。通常所说的中条古裂谷指的是晚太古代至早元古代时中条山地区的大地构造环境。事实上,从沉积建造和岩浆建造来分析,本区中晚元古代的西洋河期也为裂谷环境,但这两期裂谷是不同体制下形成的。从沉积建造、岩浆建造和大的区域背景来分析,晚太古代至早元古代时中条山地区是处于裂陷的活动环境…     

Mechanical and chemical behavior of intergranular fluids in nonhydrostatically stressed rocks at low temperature

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Effective loading algorithm associated with explicit dynamic relaxation method for simulating static problems

Based on the fact that a static problem has an equivalent wave speed of infinity and a dynamic problem has a wave speed of finite value, an effective loading algorithm associated with the explicit dynamic relaxation method was presented to produce meaningful numerical solutions for static problems. The central part of the explicit dynamic relaxation method is to turn a time-independent static problem into an artificial time-dependent dynamic problem. The related numerical testing results demonstrate that: (1) the proposed effective loading algorithm is capable of enabling an applied load in a static problem to be propagated throughout the whole system within a given loading increment, so that the time-independent solution of the static problem can be obtained; (2) the proposed effective loading algorithm can be straightforwardly applied to the particle simulation method for solving a wide range of static problems. Foundation item: Projects(10872219; 10672190) supported by the National Natural Science Foundation of China