Storm Deposits of the Sinian Zhangqu Formation in Northern Anhui — An Upward Shallowing Carbonate Sequence1

Abstract This paper studies, for the first time, the storm deposits of a carbonate sequence in the Sinian Zhangqu Formation in northern Anhui. In the formation, a great number of calcareous trider sponge spicules were discovered in a distal storm turbidity sequence, which have provided further evidence for the correlation of the Sinian Systems in North and South China from a view point of palaeontology.     

对苏联固体镭源的检定

本文采用电离法(平板电离室装置)对英产镭源和苏联产镭源进行了研究,找出了两种不同当量壳镭源之间的相关关系,解决了按照国际镭源标准对苏联产镭源含量的检定方法。     

Shear resistance of jointed rock masses and stability calculation of rock slopes

Summary Based on an extension to a model originally proposed by Zhang (1990), a method for estimating the shear strength of a jointed rock mass containing two joint sets is developed. Compared to the original method in which only a single en-echelon joint set was considered, the new method has the following advantages: (1) it allows a much more realistic joint pattern to be incorporated; (2) the effects of joint connectivity and intersection angle between joint sets on shear strength are included. Use of the new method is demonstrated by application to the calculation of the stability of slopes in jointed rock. The importance of joint connectivity, joint persistence and joint set intersection angle on slope stability, as predicted by the model, is revealed.     

宁芜地区三个辉长岩的全岩和矿物Rb-Sr等时线年龄

 从南京到芜湖有许多辉长岩体分布,如南京蒋庙岩体、高古山岩体、大栏杆岩体,马鞍山阳湖塘岩体,当涂姑山岩体和芜湖市区的辉长岩体等。     

吉林省浑江市荒沟山区花岗岩成因类型探讨

本文根据吉林省浑江市荒沟山区中生代花岗岩的岩石学、地球化学及同位素地质学研究，论述了该区花岗岩的成因类型，即老秃顶子岩体、梨树沟岩体、草山岩体均为同熔型。     

皖南伏川蛇绿岩形成环境的地球化学标志

皖南伏川蛇绿岩套,沿祁门—歙县—三阳坑断裂带分布,具构造侵位特征。在AFM图解上,具有拉斑玄武岩的演化趋势,但在玄武岩分类图解和Na_2O/K_2O—(Na_2O K_2O)相关图上,则具有岛弧火山岩的特征。在微量元素含量和稀土元素配分型式上和在Ti—Cr,Ti—Zr判别图上,也接近岛弧火山岩而与洋脊玄武岩差别较大。又,根据其形成的地质环境为一古岛弧,上覆地层为优地槽复理石建造,故认为伏川蛇绿岩形成的大地构造环境可能为一古岛弧。通过REE的模拟计算,伏川蛇绿岩可能是上地幔5％熔融的产物。由于变质橄榄岩中富集轻稀土元素,可以认为伏川上地幔是一种富集地幔。     

Model studies of the impact of chemical inhomogeneity on SO2 oxidation in warm stratiform clouds

A one-dimensional, time-dependent model of the physics and chemistry of a warm stratiform cloud is used to study the possible impact of chemical inhomogeneity among cloud and raindrops on the oxidation of SO₂ in clouds. The effects of chemical inhomogeneity are examined using two contrasting models: In Model 1 a bulk-solution parameterization is adopted which effectively treats all cloud and raindrops as if they are chemically homogeneous; in Model 2 we allow the cloud and raindrops to have a dichotomous distribution. The dichotomous distribution in Model 2 is simulated by assuming that the two groups of cloud droplets nucleate from two chemically distinct populations of condensation nuclei; one being acidic and the other being alkaline. While the two models yield essentially identical results when the ambient levels of H₂O₂ are greater than the ambient levels of SO₂, the rate of conversion of SO₂ to sulfuric acid and the amount of sulfate removed in the precipitation can be significantly enhanced in Model 2 over that of Model 1 under conditions of oxidant limitation (i.e., H₂O₂ < SO₂). This enhancement is critically dependent upon the fraction of alkaline nuclei assumed to be present in Model 2 and arises from the rapid increase in the aqueous-phase reaction between O₃+S_IV at high pH. Our results suggest that cloud models which adopt a bulk-solution parameterization for cloud droplet chemistry, may underestimate the amount of in-cloud SO₂ oxidation under oxidant-limited conditions.     

HP—3808A测距仪测距精度分析

本文采用数理统计方法,详细分析了HP—3808A激光测距仪近几年来积累的测量数据,求得仪器平均测距相对精度为1:70万。并且讨论了进一步提高测距精度的技术措施。