藕塘古滑体在三峡水库形成后的稳定性分析

采用极限平衡和三维弹塑性有限元分析方法,对藕塘古滑体在三峡水库形成后的稳定性进行了计算分析。计算中考虑了水库水位变化、渗透压力、建筑荷载以及地震等诸多因素对滑体稳定性的影响,并给出了滑体失稳的临界破坏条件,为库区移民迁建新址的勘察工作提供了量化的论证。     

储层裂缝特征测井解释方法综述

为了更好地研究裂缝性砂砾岩储层和其它裂缝性储层裂缝的测井解释问题,综述了目前在裂缝性储层裂缝测井解释中主要采用的常规评价、人工神经网络和斯通利波３类方法在识别裂缝带和定量计算储层裂缝参数两个方面的应用原理和研究现状,并指出了今后的一些研究方向。     

扫描电镜分析各类微体化石样品最佳镀膜的探讨

根据多年的工作经验和试验对比,总结出了非导电微体化石－放射虫,硅藻,竹节石,有孔虫,介形虫,轮藻,牙形石,海绵骨针等的最佳镀膜方法和最佳镀膜厚度。     

Silicon Isotope Geochemistry of Micro—Fine Disseminated Gold Deposits in SW Guizhou and NW Guangxi,China

Quartz was studied with respect to its silicon isotopic composition and cathodoluminescence in micro-fine disseminated gold deposits in SW Guizhou and NW Guangxi.The results showed that quartz in wall rocks.ores and that in association with hydrothermal silicification are distinctive in silicon isotopes and cathodoluminescence characters.Quartz in association with primary silicification is non-luminescent while that in wall rocks and associated with secondary silicification exhibits striking luminescence.Based on the dynamic fractionation of silicon isotopes,it is suggested that the mineralization was accompanied by rapid transport of aprimary siliceous fluid along the major deep fault system into subordinate faults before ore components deposited in favorable strata via penetration and metasomatism.Therefore,a deep origin is implicit for gold deposits of this type.     

Experimental observation on the characteristics of the near-surface turbulence over the Antarctic ice sheets during the polar day period

Based on the ultrasonic anemometer/thermometer data in the East Antarctic coastal area ice sheets ob-tained first by Chinese scientists, turbulent intensity, kinetic energy and sensible heat of turbulence, surface roughness height drag coefficient and normalized variation were calculated and analysed using the eddy-correlation method. The results show that the values of roughness height and drag coefficient are 4.3 X 10 m and 1.8x 10 -³, respectively. These turbulent parameters have apparent diurnal variations. Project supported by the National Natural Science Foundation of China (Grant No. 49675252).     

Paleoclimatic significance of grain size of loess-palaeosol deposit in Chinese Loess Plateau

Particle size analysis for samples from three last glacial cycle loess-palaeosol profiles along a northwestsoutheast transection on the Chinese Loess Plateau has been carried out. The paleoclimatic significance of grain size indices has been obtained by analyzing the fraction content variations and their comparisons with global ice volume and solar radiation variations. The results show that (i) paleoclimatic significance of the grain size indices of loess-palaeosol deposit is different with grain size fraction content and sampling points in Chinese Loess Plateau; (ii) the sub-coarse grain fraction is a good proxy index of East Asia winter monsoon strength and therefore can be used to detect the global climate changes; (iii) the content of sub-fine and fine grain fractions is influenced by both the input of sub-coarse grain fraction and pedogenesis; (iv) the sub-coarse fraction exhibits a negative relationship with the sub-fine and fine fractlon. Project supported by the 9.5 major project of Chinese Academy of Sciences and the open grant of the State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences.     

就张北地震谈谈地震监测预报中的几个技术性问题

１９９８年１月１０日河北省张北县发生６．２级地震,作为对这次地震的一次反思,就地震监测预报中的长、中、短临预报、地震速报、震害预测等各项工作中的技术问题、改进方向提出了一些具体意见,以供同行们参考。     

地震前兆信息量的研究：（一）地震异常延续有效性的研究

根据我国大陆５８个Ｍｓ≥５级地震的震列资料,详细地研究了地震异常延续有效时间与持续时间的相关关系,给出了由地震异常持续时间计算地震异常预测的有效时间（即地震异常延续有效时间的最优估值）的公式,经多种数理统计方法检验,证明这一公式是保信、可用的。这为进一步深入开发的震异常前兆信息量的研究奠定了基础,同时也为日常地震会商中常震确定地震异常延续有效性问题,提供了定量分析判定依据,因此本研究具有一定的实际     

二滩水电站地震遥测台网持续时间震级的研制

利用二滩水电站地震遥测台网的速度量和位移量观测记录,收集了震级ＭＬ为０．４￣５．４的４６０次地震（Δ〈２１０ｋｍ）的振动持续时间３５００多条,制作了该台网的持续时间震级公式和便查表。在方法上,不同于通常的按一次或两次曲线拟合,而采取计算机自动分段按折线拟合的方法,以阻尼最小二乘法完成其计算;在资料上,先分台制作８个子台的持续时间震级公式,在此基础上选择仪器、台基及公式中参数相近的子台,制作了适用于     

“三江”地区北段某多元素异常带的特征及找矿前景分析

１∶２０万区域化探扫面圈定出“三江”地区北段某多元素异常带,呈北西南东向条带状展布。由Ｗ、Ｍｏ、Ｃｕ、Ｂｉ、Ｕ、Ｓｎ、Ａｇ、Ｃｄ、Ｐｂ、Ｚｎ、Ａｓ、Ｂａ、Ｈｇ、Ａｕ等高中低温热液成矿与伴生元素组成于一体,具典型的浓度分带与组分分带特征。它位于玉龙斑岩铜矿带北侧,对该异常带的解剖,具重要的理论与实际意义。