科依纳可能发生一次5级地震

位于印度西海岸附近的科依纳（Koyna）是众所周知的人造水库触发地震最显著的地方（Gupta，1992）。自从科依纳大坝建成之后斯瓦季萨加（Shivajisagar）湖蓄水以来的44年中，发生了震级M6．3的最大的触发地震（1967年12月10R）以及19个大于等于5级的地震。震级为4级左右的地震约170个，还有数千个更小的地震。最近的一次5级地震发生于2005年3月14R，在上一次5级地震发生了4年半之后（Satyanarayana et al，2005）。     

四川黄龙沟景区钙华的起源和形成机理研究

对四川黄龙沟钙华景区的水化学测试发现，形成黄龙沟钙华的泉水具有很高的Ca^2 和HC03^-离子浓度，相应地，泉水的C02分压显著高于大气和土壤生物成因所能产生的C02分压。结合泉水出露的地质条件和泉口C02气体碳稳定同位素组成(δ^13C＝—6．8‰)的分析，进一步发现，高C02分压与深部成因的C02有关。可见，黄龙沟钙华属于热成因类钙华，而非原来普遍认为的“是气候岩溶作用的产物”。此外，黄龙沟钙华的大量出现与水中方解石的迅速沉积、Ca^2 和HC03^-浓度的大量降低有关。随着地下水自泉口出露，由于水的C02分压远高于大气，水中C02大量释放于大气，结果水的pH值迅速升高，方解石饱和指数由泉口的负值很快转变为高的正值，为方解石的沉积奠定了必要的物理化学基础。放置于水中的大理岩石片观测表明，流速较快的边石坝处的方解石沉积速率是其附近水池内的2—5倍，这清楚地显示了水动力条件对沉积速率的控制。进一步根据DBL理论模型分析发现，水动力条件对方解石沉积速率的控制在于其对固液界面间扩散边界层(DBL)厚度的影响，流速愈快，DBL厚度愈薄。且DBL厚度最终制约着沉积表面的化学组成浓度，即厚度愈小，表面H^ 浓度愈低(或pH愈高)、方解石饱和指数愈高，进而方解石沉积愈快。     

First Occurrence of M andarinoite in China

This report describes the first occurrence of the rare mineral mandarinoite (Fe3+2 Se3Og · 6H2O) in China. It occurs in the Lower Permian Maokou Formation carbonaceous shale in Yutangba Village east of Enshi City in southwestern Hubei Province. The shale is selenium-rich and contains native selenium, V-Mo-Cr-bearing iron oxide, clay and quartz. Weathering of the selenium in the bedrock under moderate to high redox conditions in the presence of ferric iron has formed mandarinoite.     

山东半岛西北部与花岗岩类有关的金矿床成矿作用的金和硫化物特征

元古代固结的中国地台东北部在早中生代构造一岩浆活化时期是大规模花岗岩类岩浆作用的场所,山东半岛西北部与晚期岩浆作用有关的中深成中温热液金矿床,在中国提供了不少于1／4的黄金开采量。沂沐断裂（郊一庐断裂系统）东盘的次级断裂是控矿的重要构造要素。贯穿3个近东西向     

LOCAL SCOUR AROUND BRIDGE ABUTMENTS

1 INTRODUCTION The protrusion of a bridge abutment or a spur dike into the main channel creates a disturbance and obstruction to the otherwise equilibrium state of sediment transportation in an alluvial river. The flow accelerates and separates at the upstream face of the abutment as it moves past the obstacle, creating a vortex trail that moves downstream in a direction approximately perpendicular to the structure. The result is that the bed around the structure is eroded locally. The l…     

西澳大利亚太古宙地壳的磷灰石裂变径迹年龄,稳定性和侵蚀水平

磷灰石裂变径迹法年龄(fission-track ages)对轻微热力和构造干扰影响都是很敏感的。根据实验室焖火实验和采自深钻孔天然热标本进行年龄测定目前人们清楚,磷灰石的径迹法只有在整个地质时间里都在100℃以下的温度条件下才是稳定的。因此经常把磷灰石年龄解释成岩石冷却到此温度以下所记录的最后时间。因而,应用于区域规模上的磷灰石径迹法年龄测定能得出太古宙地盾区低温热力史和地壳稳定性的新观点。     

A STUDY ON THE ESTIMATION OF TEMPERATURE STRUCTURE PARAMETER IN ABL WITH ELEVATED INVERSION

Temperature structure parameter in the vertical is estimated once by using the turbulence outerscale approximation and another by using the Obukhov similarity relationship during the formation ofan elevated inversion.A comparison of the profiles drawn using both the methods is done for the pur-pose of assessing the accuracy of the similarity method when applied to levels above the surface-basedlayer.The profiles obtained by both the methods are also compared with a similar profile obtained af-ter considering a bulk shear between the ground and top of the elevated layer.     

A Study in Search of Interconnection between Surface Parameters and Surrounding Synoptic And Subsynoptic Features

The paper reveals that the variations in parameters like u*, the scaling velocity and θ*. The scaling tempera-ture during the various phases of monsoon might be linked with subsynoptic features. The rise in u* is mainly connected with the presence of lower tropospheric cyclonic vorticity over a subsynoptic scale of the site. However the variations in θ* is mainly linked with the various phases of monsoon and θ* shows a sharp rise in presence of low level convective cloud.Besides the correlation studies of u and u*, θv and θv* , θv-θv0 and θv* are undertaken. The correlation be?tween θv and θv* is poor. In other two cases correlations are good. Besides u/u* , has shown good coefficient of variation values within the ζ range.     

日本神户地震地下水化学前兆变化

在１９９５年１月１７日灾难性的神户７．２级地震之前，在震中附近两口井流出的地下水中氯离子和硫酸根离子的浓度发生了变化。测量的样品是抽取的瓶装地下水，这些水是１９９３年到１９９５年４月在国内市场上销售的饮用水。