甘肃张掖黑河口断层晚更新世晚期以来的活动

黑河口断层位于张掖西南约３０ｋｍ是一条走向北向，倾向南西的逆断层。黑河沿岸的一个天然剖面上见断层面向南西陡倾，奥陶系向北东逆冲于晚更新世河流砾石层之上，垂直断距１７ｍ。断层活动在黑河队地上形成了一个断层陡。     

渤海湾中、新生代盆地构造活动对沉积作用的影响

本文通过对比渤海中、新生代盆地的控盆断裂和地层分布,中生代盆地与新生代盆地的叠合类型主要有继承型和相干型。又对渤海辽东湾、渤西、渤中和莱州湾四大区36条地震剖面的分析,得出结论:渤海中、新生代主要有三期断层活动高峰期:中生代、沙河街组二、三段沉积期和东营期,其中沙河街组三段沉积期是活动最强烈时期,而沙河街组四段孔店和沙河街组一段这两个时期以及馆陶期以来为活动较弱时期。     

惠民凹陷沙三期—东营期断裂活动性研究

应用断层落差法,对惠民凹陷沙河街—东营期的断裂活动特征进行了研究.研究表明惠民凹陷古近纪经历强烈的伸展活动,断层活动强烈.凹陷内部的断层主要以北东向为主,断层活动具有分段性的特点,惠民凹陷断层活动形成了多种断裂几何形态.盆地边缘断层和内部断层的活动形成了半地堑、半地垒和地堑—地垒形式的断块体,其断块体组合的分布使整个惠民凹陷具有南北分带、东西分块的分区块断的构造特征.沙三—沙二早期,惠民凹陷处于快速伸展断陷期,中央背斜带隆起,临商断裂带和夏口断裂带活动较强;沙二上—东营组沉积期伸展裂陷活动减弱.经过古近纪断陷期的构造演化,基本确定了惠民凹陷的构造格局.     

梁宝寺井田瓦斯涌出规律及其预测

根据矿井建设和生产过程中积累的大量的瓦斯地质资料,分析了瓦斯质量体积、煤层埋藏深度、围岩特性、地质构造等主要因素对梁宝寺井田瓦斯涌出的影响.总结的涌出规律为瓦斯涌出量随埋藏深度增大而增大,随顶板砂岩比增大而减小,在遇断层处涌出量明显增大.运用多元回归分析的方法对瓦斯涌出进行定量预测,结果表明,该方法预测梁宝寺井田瓦斯涌出的结果能够与实际地质情况较好的吻合.     

断层泥吸附气体特征与断层活动性关系初步研究

断层带中断层气异常测量作为气体地球化学方法之一,已应用于地震预报和断层活动性研究.断层泥是断层活动历史的直接记录,为了探索断层泥中的吸附气体与断层活动性之间的关系,对大柳树地区的断层泥取样,进行室内脱气和气体组分测定,分析了不同特征断层泥吸附气体质量浓度变化的规律,初步建立了断层泥吸附气体组分与断层泥测年值之间的相关方程,并计算了误差.结果表明断层泥吸附气体与断层特征和活动性关系密切.     

中国特有的土壤系统分类

据国家自然科学基金委员会2006年1月26日报道，国内37所大学和科研机构、200多名土壤学家，在建立我国特有的土壤类型诊断层及人为土纲的诊断体系等方面取得重大突破．主要成果如下。     

林南仓煤矿矿井构造特征

矿井地质构造是影响煤矿建设与生产最重要的地质因素.为了查明林南仓煤矿构造的展布、组合、形成与演化,并对未采掘区的构造进行预测预报,以大量的构造统计资料为依据,运用数理统计和趋势面分析的方法对采区的构造进行统计分析,研究林南仓煤矿矿井构造特征.研究表明:唐山矿小断层走向以NWW向为主,倾向主要以SSW为主,且80%以上为正断层;不同区域、不同煤层之间断层发育存在着较大的差异,林南仓矿区的构造样式是多期次构造运动的叠加.     

^40Ar／^39Ar geochronological constraints on syn-orogenic strike-slip movement of Tan-Lu fault zone

Two phases of sinistral strike-slip ductile shear belts occur on the eastern margin of the Dabie orogenic belt. A muscovite ~(40)Ar/~(39)Ar plateau age of 128 Ma was obtained from mylonite in the later ductile shear zone. Three muscovite samples separated from mylonites of 3 localities in the earlier ductile shear belts yield ~(40)Ar/~(39)Ar plateau ages of 192.5±0.7 Ma, 189.7±0.6 Ma and 188.7±0.7 Ma, respectively. They are interpreted as cooling ages of the earlier sinistral strike-slip deformation. It is suggested that left-lateral displacement of the Tan-Lu fault zone started in a late stage of the collision orogeny in the Dabie-Sulu orogenic belt between the North and South China plates. Therefore, the earlier Tan-Lu fault zone was syn-orogenic strike-slip tectonics. The fault zone was used again for sinistral displacement during tectonic activities of peri-Pacific regime in Early Cretaceous. It is proposed that the fault zone occurred as a transform fault during the orogenic process.     

Evolution of dislocation patterns and its application in prediction of flow stress

The feature of dislocation patterns generated in plastic deformation is the ordered structure of alternative appearance of high and low dislocation density zones. With regard to the system of edge and screw dislocations, a nonlinear partial differential equation (eq. (13) in the text) including high order terms is established based on the reaction-diffusion equation. The contribution of cross slip of screw dislocations to the edge dislocation density is also considered in the analysis. The established equation has the typical feature of nonlinear system. Therefore, one does not need to deal with the complex expressions of the reaction and generation terms for dislocations. By theoretical analysis, the distance between adjacent high dislocation density zones (cell size or distance between cell wails) is obtained. By using this relationship, the flow stresses of ultrafine grained (UFG)copper and aluminum are predicted. The calculated results are well consistent with the experimental.     

Paragenesia of Quaternary pediments and river terraces on the north piedmont of Wutai Mountains

A study has been made of the paragenetic relations of the pediments and river terraces on the northern piedmont of Wutai Mountains via geomorphologic mapping of 1:10000 scale, and an analysis on the role of tectonic, climatic, and drainage factors in the parageneses. The Quaternary pediments and river terraces on the north piedmont of Wutai Mountains united to constitute six steps of geomorphic surfaces. The episodic uplifting of fault blocks was the dominant factor in the formation of the unified surfaces, however climatic change and drainage diversities led to undulation of the surfaces. The second terrace of Yangyan River (T2) was formed in the last glacial maximum, when the river was in aggradational state. The third to fifth terraces were formed in interglacial stages, when the river was in equilibrium or degradational state. It is inferred that climate had no insignificant effect on the river incision caused by tectonic uplifting. In light of terraces dating, since the Quaternary the Wutai fault-block mountains experienced six rapid uplifting events, and the starting time of the last four events was respectively 1.2, 0.6, 0.13, and 0.02 Ma B.P.