蛇纹石族矿物及其热转变产物的红外光谱研究

本文报道了蛇纹石族矿物及其热转变产物的红外光谱。在室温下斜纤蛇纹石,正纤蛇纹石,叶蛇纹石和利蛇纹石都具有各自的特征光谱。在结构资料基础上,我们解释了它们之间的光谱差异。无疑,红外光谱是区分各种蛇纹石矿物的有效手段。 样品加热到600—700℃时,3680cm~(-1)羟基带消失,这表明在该温度下蛇纹石矿物完全脱羟。与此同时,光谱中出现橄榄石870cm~(-1)的最强带和一个宽带1000cm~(-1),这说明蛇纹石已部分地转变为晶质橄榄石和形成一个无定形的中间相。800℃时,1060cm~(-1)新带的出现标志着顽火辉石的生成。在所有加热样品的光谱中都没有发现SiO_2吸收带,故可认为,在蛇纹石的热转变过程中没有出现SiO_2相。     

衍射指标h和k的互换问题

通过衍射线指标和面网指标的联系讨论了晶体的对称性对衍射指标h和k互换的影响。在下列情况下衍射指标h和k是不能互换的:在低级晶族;在四方晶系C_(4h)—4/m劳厄点群,六方品系C_(6h)—6/m劳厄点群和立方晶系T_h—m3劳厄点群对于hko和kkl型衍射;在三方晶系选取六方晶胞的情况下,在C_(3i)—3劳厄点群对于hol,okl,hko和hkl型衍射,在D_(3d)—3m劳厄点群对于holokl和hkl型衍射,以及在菱面体点阵除非h和k都是三的倍数。     

NUMERICAL SIMULATION OF THE GENERATION OF MESOSCALE CONVECTTVE SYSTEMS IN LARGE－SCALE ENVIRONMENT

The generation of mesoscale convective systems is simulated by a 7-level primitive equation model. The large-scale parts of observed, data at 1200 Z June 11, 1983, which are obtained by low-pass filter, are used as the initial data. The results show that the generation of mesoscale convective systems can be simulated from fields of meteorological variables on the large-scale background. When the low-level south-west jet stream is very moist, mesoscale convective systems can develop ahead of the wind speed maximum in the warm sector of Jiang-Huai (Changjiang-Huaihe Rivers) cyclone, where the potential stability tends to remain negative. Furthermore, they are similar to the mesoscale convective complex (MCC), which appears frequently in the central part of the United States during the warm season (March to September), in dynamical and thermal structure, distribution of precipitation and the process of generation and development.     

多普勒声雷达测风与直接测量仪器的观测比较

文中对多普勒声雷达测风和325 m铁塔上风速、风向仪及超声风速仪的测量值进行了观测比较。结果表明,当信噪比大于1时,两种方法测量的平均风速、风向的相关较好,风速、风向廓线较为接近;声雷达测量的垂直风速平均值和均方根差比超声风速仪的测量值略偏大。这与国外进行的观测比较结果一致。 需要指出,声雷达和直接测量仪器的观测比较中存在一定差异,特别是对比每一次的观测值就可以看出,在某些情况下还存在明显差异。进一步分析声雷达测风产生偏差的原因,对误差做出合理的订正是十分必要的。     

中国沉积变质型铀矿床矿化特征和成矿条件探讨

我国沉积变质型铀矿床主要产在华北地台的太古界、元古界的变质岩系中,都在古老基底剥蚀面之上,有花岗岩侵入或混合岩化。古地理环境为滨海-浅海相中近古海岸线的基底洼地。矿化特点因地段不同而异:远离花岗岩地段,矿体呈似层状,与地层产状基本一致,受层位、岩性控制,铀矿物是沥青铀矿,粒度小,沿层理定向排列;近花岗岩外接触带或混合岩化地段为巢状矿体,铀矿物是晶质铀矿,粒度大,呈脉状、网脉状产出。与国外澳北区铀矿床相比,两者基本相似,但我国铀矿化分布空间大,形成时间长,无盖层。矿床形成过程为:沉积阶段形成了富铀     

Waxman-Smith方程在生油岩评价中的应用:重叠法和双孔隙度法

提出了两种新的生油岩测井评价方法，即基于砂泥岩导电机理，借助泥质砂岩导电方程：Ｗａｘｍａｎ－Ｓｍｉｔｈ方程计算含水泥岩电阻率Ｒ０值及生油岩的电阻率孔隙度Ｒ．然后用实测Ｒｔ减去Ｒ０值，其差值反映了生油岩的有机质丰度（即重叠法）；用三孔隙度测井计算的生油岩总孔隙度Ｔ，减去电阻率孔隙度Ｒ，其差值也反映了生油岩的有机质丰度（即双孔隙度法）．该方法的最大优点是在现场缺少生油岩实验室分析样品时可以快速评价生油岩的有机质丰度。     

五寨4.8ML地震宏观考察与震害评估

本文介绍了对１９９３的９月１１日五寨４．８ＭＬ地震的考察情况，确定宏观震中在五寨县丰兑坡与河曲县土沟村一带，震中烈度为６度。计算得出本次地震的总经济损失约１５万元。     

The Evolutionary History of Ore-forming Processes of Metallic Ore Deposits in Northern Guangxi

The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late timesfin the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.     

工程地质评价定量表格化的一种实现方法

本文对传统的工程地质评价方法作了扩展,称之为工程地质评价的定量表格化。本文详细给出了定量表格化的一种实现方法。两个应用实例表明,该方法既定量又简便,具有良好的适用性和推广前景。     

漫话矿泉水的浴疗作用

本文综述了矿泉浴的医疗作用机理，主要的几种矿泉水浴疗条件和适应症，井阐述了矿泉浴疗应注意的问题。