汉南杂岩与金成矿特征

汉南杂岩区位于扬子地台北缘,围岩为元古界绿片岩 勉县—洋县深大断裂系统在成岩、成矿与盆地形成方面占有重要的地位.杂岩体由斜长花岗岩、二长花岗岩、钾长花岗岩、石英闪长岩和辉长辉绿岩组成.金矿化类型主要有石英脉型和蚀变岩型,与接触带、断裂带、蚀变带有关,蚀变后岩石矿物成分变化.使金重新分布,砂金分布与金源、地貌和新构造运动关系密切.     

Non-Gaussian probability distributions of solar wind fluctuations

The probability distributions of field differences x()=x(t+)-x(t), where the variable x(t) may denote any solar wind scalar field or vector field component at time t, have been calculated from time series of Helios data obtained in 1976 at heliocentric distances near 0.3 AU. It is found that for comparatively long time lag , ranging from a few hours to 1 day, the differences are normally distributed according to a Gaussian. For shorter time lags, of less than ten minutes, significant changes in shape are observed. The distributions are often spikier and narrower than the equivalent Gaussian distribution with the same standard deviation, and they are enhanced for large, reduced for intermediate and enhanced for very small values of x. This result is in accordance with fluid observations and numerical simulations. Hence statistical properties are dominated at small scale by large fluctuation amplitudes that are sparsely distributed, which is direct evidence for spatial intermittency of the fluctuations. This is in agreement with results from earlier analyses of the structure functions of x. The non-Gaussian features are differently developed for the various types of fluctuations. The relevance of these observations to the interpretation and understanding of the nature of solar wind magnetohydrodynamic (MHD) turbulence is pointed out, and contact is made with existing theoretical concepts of intermittency in fluid turbulence.     

地图质量评判的数学模型

应用数学分析方法建立一个地图质量模糊评判的数学模型，并用上述模型对１２幅地形图编绘质量进行评判，所得结果令人满意。     

广东冬季气候资源优势及寒害与对策

本文论述了广东冬季气候资源的优势及冬季寒害的两重性，分析了近两年寒害对农业生产的影响，在些基础上，提出了防御寒害的综合对策。     

长期降水量预报途径的探讨

本文对上海近30年（1951－1980年）降水时间序列的属性进行了分析，由此建立了旬降水量游程序列和距平势序列预报模型，并预报了未来降水量的大小，效果较好。     

陇县904地区混合岩型铀矿成矿特征的讨论

含铀混合岩大部分位于古陆隆起带边部、ＮＷ向花岗岩外接触带。深大断裂系统在成矿成岩中占有相当重要的地位。燕山期构造和岩浆活化，对原有的构造和矿化进行了强烈改造。在混合岩中发现了两种主要成矿类型，即铀一赤铁矿型和铀一碳酸盐型。     

A study of inclusions in fluorite from the Shuangjiangkou-Jiangjunmiao fluorite ore deposit in Hunan Province

The Shuangjiangkuo-Jiangjunmiao fluorite ore deposit occurs in Early Yenshanian granites in the fold system of south China. The average homogenization temperature of inclusions in fluorite is 250°C. The contents of CO₂ and CH₄ in the inclusions tend to increase from southeast to northwest as well as in the vertical direction. Liquid in the inclusions is composed mainly of CaO, F and Cl with minor SO ₄ ² . All this has contributed a lot to the formation of fluorite as well as to wall-rock alteration. This ore deposit is evidenced to be mesothermal in origin.     

Distribution and sequential extraction of some heavy metals in urban soils of Guiyang City,China

Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total concentrations and sequential extraction of Cr, Cu, Pb, Zn and Cd by ICP spectrometry. The average total concentrations ofCr, Cu, Pb, Zn and Cd in the soils of Guiyang were 92.9, 51.6, 44.1,139.3 and 0.28 mg/kg, respectively. The soils have been polluted by Cr, Cu, Pb, Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr, Cu, Pb, Zn and Cd in different functional zones. As for the sequential extraction, Cr, Cu and Zn were present mainly in the residual fraction, and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%, and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd〉Pb〉Cu〉Cr〉Zn.