某地洼区F_1等断裂带构造地球化学特征及其铀成矿规律的探讨

本文运用地洼成矿理论和构造地球化学的方法,研究了区内 F_1成矿断裂等的构造特征和元素的变化规律以及铀等成矿元素的不断累增富集的成矿作用过程.区内钠矿床的形成大体上经历了铀的预富成岩(形成铀源地质体)→断裂动力改造热液(热水)成矿→表生淋积等三个主要发展阶段,形成了一个具有层控特征的多因复成铀矿床,从而为本区指明了找矿方向.     

铜陵天马山金硫矿床成矿系统研究

天马山金硫矿床位于铜官山背斜近倾没端、靠近轴部的东南翼,天鹅抱蛋山岩体东侧.文章从成矿系统的角度对区内多金属矿床进行了阐述:①矿区成矿系统要素,如矿源场、成矿流体、成矿能量和储矿场;②成矿流体在流体输运-化学反应耦合成矿作用过程中,与成矿流体组分相关的成分守恒方程;③在特定的时空条件下,矿区矿源场、流体场和能量场的耦合过程;④成矿作用机理.     

Application of Load/Unload Response Ratio in the Study of Seismicity in the Region of Iran

The variation of Load/Unload Response Ratio (LURR) against time for earthquakes in Kerman Province, Iran, on February 22, 2005, M6.4 and in Lorestan Province, Iran, on March 31, 2006, M6.1, has been calculated and analysed in this paper. The tempo-spatial scanning of LURR in the region of Iran during January 1, 2003 to March 31, 2006 has been conducted, with 1 year as a time-window, 1 month as a time-step, and the comparison of the LURR anomalous regions in 2004 with the actual earthquakes with M≥5.0 in the next year (2005) is also given, which shows that 11 earthquakes with M≥5.0 occurred in LURR anomalous regions while 12 earthquakes with M≥5.0 in LURR regions in 2005. Furthermore, the seismicity in this region is studied by investigating the evolvement of the anomalous LURR regions.     

从成矿构造动力学探讨脉状金矿床成矿深度

在综述国内外与韧性剪切带有关的脉状金矿床成矿动力学的新近研究成果后,根据成矿控矿构造动力学特征及其与成矿流体运移机制、矿物结晶特点的关系认为矿物结晶发生于地震微破裂导致成矿流体压力骤降后的低压力阶段,由矿物包裹体压力并按静岩压力梯度推算的成矿深度要明显小于矿床的实际成矿深度.本文提出一种新的成矿深度估算方法,其估算的成矿深度与目前大多数脉状金矿床中石英具有明显的韧性变形的特点相吻合.     

公主岭市西部水源地地下水系统初步研究

本文以公主岭市西部水源地为例,以地下水系统的观点,对该区进行了全面的系统化、模型化和最优化,建立了地下水系统的预报模型和管理模型,推求了各系统的资源量及水位、水质分布规律,最后得出了该区地下水最佳开采量和取水工程方案。     

西天山北部地区成矿规律初探

西天山北部地区可分为7个成矿带:阿拉套钨、锡、铜、铁、金成矿带;温泉—别珍套铜、铌钽成矿带;汗吉尕铅锌成矿带;赛里木铜多金属成矿带;科古琴铜多金属成矿带;博罗霍洛金成矿带;精河南阿勒坦金、锑成矿带。区域矿床成矿物质来源的复杂性和多源性以及区域成矿演化的控制,常常表现为矿床的共生叠加性和矿床分布的不均匀性。     

海南岛抱板群岩石高温高压实验及金成矿机理探讨

高温高压实验岩石学是地质学、岩石学领域中的“硬科学”犤1999,王德滋,等犦。目前高温高压实验岩石学研究主要是针对单一岩石的熔化和融离实验,而针对多物源成因的花岗岩模拟其物源贡献大小的实验岩石学及同时发生的成矿作用研究基本上是一个空白。文章根据海南岛戈枕含金剪切带中元古代花岗岩的物源特征及与之有关的戈枕式金矿成因特点,通过高温高压实验岩石学模拟,初步探讨古中元古代抱板群岩石高温高压下的熔融行为及金的成矿机理。实验结果表明,具原地-半原地性质的中元古代花岗岩很可能是由6份(或4份)石英绢云母片岩+1份斜长角闪片麻岩、在压力为1.879～2.143GPa、温度849～901℃的条件下部分熔融形成的,部分熔融过程同时还发生了金的聚集和活化迁移。     

Site Response and Earthquake Design Spectra for Central Khartoum, Sudan

Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. Central Khartoum with its high-rise buildings is the center of governmental and business activities and is located on a strip adjacent to the Blue Nile. Geological and geotechnical data indicate that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone at a depth of 25 m. The alluvial deposits, locally known as Gezira formations, consist of clays grading into silt and sand with depth. Macro seismic zonation of Sudan and its vicinities, developed by the authors, gave the ground acceleration at the bedrock surface. The effect of alluvial deposits in Central Khartoum on propagation of seismic motion parameters to the ground surface is investigated in this study. Correlations are proposed for pertinent cyclic soil properties such as shear modulus, damping, and shear wave velocity. The Equivalent-Linear Earthquake Response Analyses (EERA) Model was used to study the effect of local soil conditions on ground-motion parameters. In the absence of strong-motion records in Khartoum, available worldwide strong-motion records are used. Plots showing the time histories of ground motion parameters at the ground surface are obtained. The results indicate amplification of ground motion of up to 4.93. The predicted fundamental period of soils is about 0.5 s which is typical for these types of soils. The maximum spectral acceleration varied from 0.76 to 0.95 g. For design purposes, a response spectrum curve is proposed.     

地震安全性评价工程师资格考试大纲已审定通过

把美国西部地区作为参考区,采用我国地震动参数区划图工作时所使用的美国西部地区强震资料建立参考区水平向基岩短周期加速度反应谱衰减关系;采用美国南加州地区数字宽频带记录建立参考区水平向基岩长周期加速度反应谱衰减关系。与由丰富的等震线资料统计得出的我国东部地区和西部地区的地震烈度衰减关系一起,用转换方法分别得到了我国东部和西部地区水平向基岩加速度反应谱衰减关系。对该衰减关系在重大工程地震安全性评价工作中的应用提出了建议。