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详细叙述了八卦庙特大型金矿床的矿化类型、矿体产状、形态变化，并进一步分析了找矿方向。 相似文献
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A new approach to reducing the seismic response of spatial structures with magneto-theological （MR） dampers is presented in this paper. The Genetic Algorithm with small populations （μGA） is used to optimize the control for the MR dampers to reduce structural vibration, which is difficult to achieve using classical optimal control. The advantages of μGA are the use of global properties and that fewer conditions are required to obtain the optimal function. Numerical results demonstrate the effectiveness of the proposed method in reducing the seismic response of structures. 相似文献
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松辽,辽河两断坳盆地可地浸砂岩型铀矿找矿的遥感地质信息研究 总被引：2，自引：0，他引：2
本文从松辽、辽河两断坳盆地的地形地貌、水系及古冲（洪）积扇分布等遥感地质信息特征出发,根据可地浸砂岩型铀矿床成矿地质环境、矿床围岩──砂体的时空分布规律,对两盆地找矿远景地段的遥感影像特征、构造样式及古地理环境进行分析,并结合丰富的石油地质科研资料,建立了区内可地浸砂岩型铀矿的遥感地质找矿模型,进而以此判断找矿选区的最佳部位,指出找矿方向。 相似文献
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八卦庙金矿是秦岭造山带唯一的超大型金矿床,曾被认为是微细浸染型(卡林型)金矿。但最新研究表明该矿床金为粗粒可见金,矿床空间定位和矿体展布受二里河—长沟—八卦庙—空棺沟脆-韧性剪切带控制,矿区内岩石剪切变形特征明显。在脆韧性剪切过程中形成了NW向顺层无根揉皱状含金石英脉,石英脉Ar-Ar坪年龄为(232.58±1.59)Ma,等时线年龄为(222.14±3.45)Ma,是印支期脆-韧性剪切-动力变质分异的产物。这种NW向石英脉含金1×10-6～4×10-6。在燕山早期,剪切带抬升进入浅层叠加了脆性变形,在热液作用下形成了NE向石英脉。NE向石英脉是重要的富矿石,含金4×10-6以上。石英强烈的脆-韧性变形特点记录了两期变形,从早到晚石英位错和差应力具从大到小的演化趋势。韧性剪切和后期脆性变形每一期构造-热液脉动式活动都是从早到晚△σ值降低,在两次脉动式活动的交替时期出现的构造亚稳定期成矿,应力周期形成的“应力泵”或“地震泵”作用是金矿成矿的力学机制。 相似文献
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佛罗伦萨位于意大利中部,犹如镶嵌在亚平宁半岛长统皮靴靴帮上的一颗晶莹的翡翠。气候温和,雨量充沛,土地肥沃,物产丰饶,地处南北交通要冲。向北,港口城市热那亚、意大利北部工业中心米兰、名水城威尼斯呈扇形自西向东一字排开。向南,268公里处就是意大利政治中心罗马,以及世界天主教中心梵帝冈。 相似文献
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The Daning River is a very important tributary in the Three Gorges Reservoir area. It is also a famous scenic spot. Anomalies appeared after water storage of the reservoir in June, 2003. In September, 2003, eutrophication monitoring in the 135-m backwater reach of the Daning River was conducted and the data were simply analyzed. The assessment result is that water body in the segment from Shuauglong to Longmen was mesotrophic or eutrophic. At the same time, the causes of its nutritional change were discussed, and counter-measures have been proposed. 相似文献
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