恭城—栗木断裂带的应变特征与变形环境探讨

通过系统的有限应变测量与差异应力估算,探讨了恭城—栗木断裂带的应变特征与变形环境,以其推动该断裂带的研究向更深层次发展。结果表明：①付林指数K的变化范围为0.32～1.67;应变主轴平均方位为276°∠21°,与断裂带的整体逆冲方向基本一致;断裂带的平均应变程度为2.26～3.00,属中等应变程度;断裂带的应变类型属压扁型应变与单剪型平面应变的一种复合叠加类型。②断裂带的差异应力值为40～80 MPa,变形深度小于10 km,属半脆性—半韧性的变形域。③断裂带的应变特征与变形环境及宏观构造样式基本吻合。     

THE INFLUENCE OF SLOPE AND RAIN INTENSITY ON RUNOFF AND INFILTRATION / L'influence de l'inclinaison de terrain et de l'intensité de pluie sur l'écoulement et l'infiltration

Abstract

The design and construction of a special-purpose laboratory catchment and rainfall simulator is described. The equipment consists of a soil catchment area that can be inclined at various angles. Additional instrumentation then measures the flow of water across the surface of, and through, the soil bed. Precipitation is provided by a unit that simulates rainfall at particular rates with uniform distribution.

The equipment was used to examine infiltration, runoff and other hydrological properties of a number of soils under different rainfall intensities and with different catchment slopes. Correlations were obtained for these variables.     

张家口—渤海地震活动带中东段地壳剪切波分裂研究

张家口—渤海地震活动带是我国华北地区一条重要的地震带.该区域的主压应力场方向为近EW向.本文利用2005年9月-2010年9月首都圈地区地震台站记录到的数字波形资料,采用SAM方法(剪切波分裂系统分析法),研究讨论张家口 渤海地震带中东段地壳介质各向异性的空间分布特征.结果显示:张渤活动带中部及以东区域总体的优势方向明显,为近EW方向.横跨张渤活动带两侧的快剪切波优势偏振方向的空间分布显示,地震带北侧燕山隆起区内、地震带范围内和地震带南侧华北盆地内的快剪切波优势偏振方向均为近EW方向,差异不大.     

Kinematic turbulent dynamo in a shear flow

Abstract

We consider the turbulent dynamo action in a differentially rotating flow by making use of a kinematic approach when the effect of a generated magnetic field on turbulent motions is neglected. The mean electromotive force is calculated in a quasilinear approximation. Differential rotation can stretch turbulent magnetic field lines and break the symmetry of turbulence in such a way that turbulent motions become suitable for the generation of a large scale magnetic field. The presence of shear changes the type of an equation governing the mean magnetic field. Due to shear stresses the mean magnetic field can be generated by a turbulent dynamo action even in a uniform turbulence. The growth rate depends on the length scale of the mean field being faster for the field with a smaller length scale.     

ICP-OES法测定煤样中磷、铜、铅、锌、镉、铬、镍、钴等元素

采用硝酸—氢氟酸—高氟酸混合体系,微波消解样品,用ICP-OES法测定煤样中微量元素P、Cu、Pb、Zn、Cr、Dd、Ni、Co,快速简便、准确度高。     

铁厂—石缸河锡钨矿带成矿模式及找矿潜力

矿床(点)定位于岩浆岩内外接触带及断裂构造较为发育的背斜核部。成矿带内有漕涧—志本山—瓦古等北北西向钨、锡、铅、锌、铜化探异常带,多与现有的钨锡矿床(点)对应良好;对形成构造控制高温热液矿床具有有利条件。     

郯庐断裂带北段构造样式解析

郯庐断裂带(郯城—庐江断裂带)北段在中—新生代发生多期不同性质活动,形成各具特色的构造样式.各种构造样式和地层间切割或覆盖关系的匹配研究,为限定断裂带活动期次及时代,建立郯庐断裂带北段变形序列提供了第一手资料.不同构造样式反映了断裂带由老至新经历了以下5个重要的变形事件:①密山县知—镇韧性剪切带黑云母40 Ar/39 ...     

四川省青川县碾子村清岭沟泥石流特征及防灾对策

清岭沟位于四川省青川县碾子村五社,该区工程地质条件复杂。＂5.12＂地震后沟内出现大量崩塌落石和松散堆积物,为泥石流的爆发提供了充足的物源,2008年8月清岭沟地区发生连续强降雨,8月25日清岭沟爆发了泥石流。目前沟源及沟道两侧发育一处规模较大的潜在不稳定斜坡、三处规模较大的危岩体、一处形成于＂5.12＂地震期间的崩塌堆积物,一旦遭遇暴雨等不良地质作用这些潜在物源极易失稳,成为清岭沟泥石流的物源,使清岭沟再次发生泥石流灾害,威胁清岭沟下游村落及公路。通过野外对清岭沟进行地质调查、室内试验和动力学特征分析提出了UX—150型泥石流栅栏、拦砂坝、排导槽和桥涵改造的综合治理措施。     

北秦岭瓦穴子—乔端断裂带的构造特征及形成温度—压力条件探讨

瓦乔(瓦穴子—乔端)断裂带是北秦岭尤为重要的断裂带之一,该带经历了长期的变质变形作用,记录了二郎坪弧后盆地向华北板块南缘俯冲消亡的信息。本文运用多种方法,对瓦乔断裂带几何学、运动学及形成温压条件进行研究和探讨,得出以下几点认识:①瓦乔断裂带产状基本倾向NNE,带内线理发育,表现为由N向S逆冲的运动学特征,且存在左旋剪切的分量;②瓦乔断裂带变形岩石显微构造特征明显,反映了挤压应力下塑性流变的特征;③运用角闪石全铝压力计,得到瓦乔断裂带形成压力为0.64GPa。越靠近瓦乔断裂带中心,压力逐渐变大,位于断裂带中心压力达到0.68GPa,已达到中压相系环境;④运用角闪石—斜长石地质温压计算得瓦乔断裂带形成温度范围500～550℃,属中温环境。     

The timing behavior of magnetar Swift J1822.3—1606： timing noise or a decreasing period derivative？

The different timing results of the magnetar Swift J1822.3—1606 are analyzed and understood theoretically.It is noted that different timing solutions are caused not only by timing noise,but also because the period derivative is decreasing after the outburst.Both the decreasing period derivative and the large timing noise may originate from wind braking associated with the magnetar.Future timing of Swift J1822.3—1606 will help clarify whether or not its period derivative is decreasing with time.