海拉尔盆地岩相古地理与铀矿沉积相     

漆富成 《铀矿地质》1992,8(2):100-105

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华北地台太古代绿岩型金矿床铅同位素特征及其在构造分区和矿床成因上的意义          下载免费PDF全文

关康  罗镇宽 《地质找矿论丛》1992,7(4):75-84

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新疆可可托海地区花岗岩的特征   总被引：2，自引：1，他引：2  

康旭  王淑珍 《岩石学报》1992,8(4):399-404

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煤岩的显微构造特征及其与瓦斯突出的关系——以南桐鱼田堡煤矿为例   总被引：6，自引：0，他引：6  

李康  钟大 《地质学报》1992,66(2)

煤瓦斯突出与煤岩显微结构构造密切相关。除部分显微结构构造与成煤阶段的环境等有关外,大部分都是构造变形的结果。因此,我们从构造变形类型和特点来划分煤岩显徽构造类型,既简便又利于应用。根据四川南桐鱼田堡煤矿4号及6号煤层的扫描电子显微镜研究,可将煤岩划分成5类:非构造煤、微裂隙煤、微劈理煤、碎裂构造煤和糜棱构造煤。文中详述了各类煤的特点,指出它们所代表的构造意义,并讨论了它们与瓦斯突出的关系。还特别提出糜棱构造煤的一系列塑性变形特征。得出结论:若其他条件均具备,有糜棱构造煤产出的地段,就可能是瓦斯突出最危险的部位。此外,根据观察煤瓦斯突出后的煤岩显微构造变化,提出有关瓦斯突出的过程,并探讨了煤瓦斯突出机理。在瓦斯突出过程中,已经历过塑性变形的煤岩又叠加了脆性变形,因而发生大量煤“粉尘”随突出而抛出。  相似文献   

Estimation of the transfer function by autoregressive deconvolution techniques—An application to time series analysis     

Y. S. Kang  J. J. Royer  Cl. Chambon  L. Demassieux 《Mathematical Geology》1992,24(5):479-498

The transfer function of time-dependent models is classically inferred by the ordinary least squares (OLS) techniques. This OLS technique assumes independence of the residuals with time. However, in practical cases, this hypothesis is often not justified producing inefficient estimation of the transfer function. When the residuals constitute an autoregressive process, we propose to apply the Box-Jenkins' method to model the residuals, and to modify in a simple manner the primary convolution equation. Then, a multivariate regression technique is used to infer the transfer function of the new equation producing time-independent residuals. This three-step autoregressive deconvolution technique is particularly efficient for time series analysis. The reconstitution and the forecasting of real data are improved efficiently. Theoretically, the proposed method can be extended to the convolution equations for which the residuals follow a moving average or an autoregressive-moving average process, but the mathematical formulation is no longer direct and explicit. For this general case, we propose to approximate the moving average or the autoregressive-moving average process by an autoregressive process of sufficient order, and then the transfer function. Two case studies in hydrogeology will be used to illustrate the procedure.  相似文献   

影响大兴安岭焚风的几个因子^*     

齐瑛  傅抱璞 《地理研究》1992,11(3):16-21

本文借助二维大气中尺度数值模式,讨论了我国东北地区1月份大兴安岭东坡的焚风与山区地形形状的关系,并定性地绘出了该焚风现象生消的背景条件。  相似文献   

Factors Affecting Methane Emission from Rice Paddies     

于心科  王卫东等 《中国地球化学学报》1995,14(1):60-67

A comparative study of rice paddies and the uncovered water field in Taoyuan(Hunan) showed that methane emission from rice-vegetated paddy fields in 1993 was different from that in 1992(I,e,lower in rates and irregular in pattern).Climate has obvious influence on methane emission .And ebullition made a considerable contribution to the total flux of methane emission from rice paddies (45%).This implies that the intensification of paddy cultivation of rice might not be,as was proposed,the main con-tributor to the observed gradual increasing of atmospheric methane.24-hour automatic measurements of atmospheric temperature,air temperature and methane concentration in the static sampling boxes revealed that temperature,in addition to fertilization and irrigation style,is one of the most important factors that control the emission of methane from rice paddies.  相似文献   

东海西湖凹陷早第三纪烃源岩生烃组分剖析   总被引：1，自引：0，他引：1  

李贤庆  钟宁宁  王铁冠  熊波  黄光辉  刘道燕  葛和平  林积桐 《煤田地质与勘探》1995,(6)

采用有机岩石学分析方法，结合有机地球化学资料，剖析了东海盆地西湖凹陷早第三纪烃源岩。该烃源岩富镜质组，贫惰性组，含一定数量的壳质组和腐泥组（１０％～３０％）。壳质组＋腐泥组含量与氯仿沥青、总烃和有效碳等参数密切正相关；树脂体和孢子体＋藻类体分别是早期生烃和晚期生烃的重要组分。在此基础上提出了西湖凹陷烃源岩的生烃模式。  相似文献   

内蒙造山带南部古板块构造演化   总被引：4，自引：1，他引：4  

陈琦  邹新民 《地质论评》1993,39(6):478-483

对内蒙造山带南部构造岩石组合、构造序列和部分岩石的同位素年龄研究表明，华北板块北缘在中元古代由大陆裂谷发展成被动陆缘，晚元古代开始转为活动陆缘，延续至早古生代转为俯冲－左旋走滑。随着温都尔庙蛇绿岩的定位和俯冲带北移、贺根山蛇绿岩的定位，内蒙造山带南部分别经历了两次均衡抬升－裂陷。海西末期华北－西伯利亚两大板块已缝合，进入超碰撞阶段，区内花岗岩大量侵位并形成了一系列推覆构造。  相似文献   

矿震及其前兆初探   总被引：11，自引：1，他引：11  

车用太  宁挺文 《中国地震》1993,9(4):334-340

本文通过对山东霜矿的矿震（冲击地压）发生条件、时空分布与某些征兆的调查研究，提出了利用矿震及其前兆观测探索天然地震前兆与预报方法的初步设想。  相似文献