自适应高程分级的城区DSM晕渲方法

在对传统的分层设色晕渲理论应用于城区DSM的可视化技术进行充分研究的基础上,提出了一种基于高程直方图的自适应高程分级方法。该方法通过高程直方图研究城区地形、地物的高程分布及变化特征,自适应建立高程带分级模型。实验表明,提出的晕渲图制作方法兼顾了地貌形态和地物特征的表达,成果色彩过渡自然,层次清晰,地形、地物区分明显,有较强的艺术性和实用价值。     

Thermal equation of state of natural tourmaline at high pressure and temperature

Synchrotron-based in situ angle-dispersive X-ray diffraction experiments were conducted on a natural uvite-dominated tourmaline sample by using an external-heating diamond anvil cell at simultaneously high pressures and temperatures up to 18 GPa and 723 K, respectively. The angle-dispersive X-ray diffraction data reveal no indication of a structural phase transition over the P–T range of the current experiment in this study. The pressure–volume–temperature data were fitted by the high-temperature Birch–Murnaghan equation of state. Isothermal bulk modulus of K ₀ = 96.6 (9) GPa, pressure derivative of the bulk modulus of \(K_{0}^{\prime } = 12.5 \;(4)\), thermal expansion coefficient of α ₀ = 4.39 (27) × 10^?5 K^?1 and temperature derivative of the bulk modulus (?K/?T) _P  = ?0.009 (6) GPa K^?1 were obtained. The axial thermoelastic properties were also obtained with K _a0 = 139 (2) GPa, \(K_{a0}^{\prime }\) = 11.5 (7) and α _a0 = 1.00 (11) × 10^?5 K^?1 for the a-axis, and K _c0 = 59 (1) GPa, \(K_{c0}^{\prime }\) = 11.4 (5) and α _c0 = 2.41 (24) × 10^?5 K^?1 for the c-axis. Both of axial compression and thermal expansion exhibit large anisotropic behavior. Thermoelastic parameters of tourmaline in this study were also compared with that of the other two ring silicates of beryl and cordierite.     

广西田东县那矿金矿区地质与地球化学特征及找矿方向

广西田东县那矿金矿位于滇黔桂金三角,属于卡林型金矿。本文在对那矿金矿区进行1∶10000地质填图的基础上,基本上查明了其成矿地质背景,结合1∶10000土壤地球化学测量,选取Au、As、Sb三种元素为成矿指示元素。通过土壤地球化学数据分析,对矿区内指示元素异常的特征、分布与地质现象进行对比分析,进行异常解释评价。研究结果显示:那矿金矿区中三叠统百逢组中上部粉砂质泥岩、泥岩、泥质粉砂岩是赋矿层位;坡表谷背斜与坡表谷断裂的复合部位为成矿有利部位;硅化、(褐)黄铁矿化、毒砂矿化、高岭石化、绢云母化、碳酸盐岩化等蚀变为金的矿化标志;圈定的Ⅰ号异常带是矿致异常,其Au元素异常规模大、品位高,是该区找矿的重点靶区。