山西（交城）花岗岩体地质环境与理化特征研究

本论文对交城花岗岩体的地质环境、工程力学和理化特征作了初步研究。认为交城岗花岩体的地质构造稳定、水文地质条件良好,岩性均匀,故选择交城花岗岩作为研究主岩,并对典型核素在填隙物和花岗岩上的吸附性能进行了试验。     

三峡库区部分县移民迁建工程中的地质问题与建议

巴东、巫山、奉节三县新址建设引发出一系列地质问题,主要有：（１）对一些基本地质问题认识尚不够统一;（２）施工过程中人为引起大量岩体稳定性问题;（３）对未来水库蓄水引起的问题的预测和防护工程的配套建设,还没有引起足够重视和采取相应的措施。为此建议：（１）进一步开展必要的研究工作;（２）加强迁建地质技术管理工作。     

地质地球化学图解的计算机绘图系统

根据目前国内外发表的常用地质地球化学图解特征,研制了一套容纳１５０多幅常用地质地球化学图解的绘图系统。系统界面友好,操作方面,适用性极强,具有可扩充性。     

The recent history of erosion and sedimentation on the Southern Tablelands of southeastern Australia: sediment flux dominated by channel incision

As in other regions colonised from Europe within the last few centuries, Australia's vegetation and soils have been dramatically changed by clearing, cropping and grazing. In southeastern Australia, particularly on the Southern Tablelands, the impacts of European settlement are clearly manifested by channel incision. By using stratigraphic and documentary evidence, in conjunction with aerial photographs, sediment budgets for the post-settlement period have been constructed to define the fluxes and stores of sediment for each of the major geomorphic components of the 136 km² catchment of Jerrabomberra Creek near Canberra. Using these budgets, and some plausible assumptions, it has been possible to approximate the history of both the sediment delivery ratio and sediment yield for this catchment. While the quantities estimated in this analysis are approximations, the trends through time are credible. Sediment yield increased rapidly to a peak after European settlement, and has returned to a level between the peak and the pre-European value. The delivery ratio has followed a similar trend. The most general conclusion to emerge is that in this landscape both the total sediment flux and the sediment yield of the catchment have been dominated by channel erosion. This result is contrary to the findings in many parts of the world where sheet and rill erosion dominates the fluxes. The soil conservation implication of these results is clear: to control off-site effects of erosion, the focus must be on the channels.     

Mineral magnetic and physical properties of surficial sediments and onshore samples from the southern basin of Lake Baikal, Siberia

Results of lithostratigraphic and mineral magnetic analysis of two surficial sediment cores (21 cm and 45 cm in length) collected from the Southern basin of Lake Baikal at a water depth of 1390 m, are presented. The sediments have been measured for a wide range of mineral magnetic parameters in order to assess their value in the identification of turbidite layers. Particle size and geochemical data are also presented and these explain some of the down core variations in magnetic mineralogy. It is suggested that changes in the particle size frequency distributions down core may be related to fossil diatom shells. One of the cores has been dated using ²¹⁰Pb. The sediment cores were cross-correlated using low frequency magnetic susceptibility (f) and these cores can also be correlated with a nearby core collected earlier in 1992. Changes in the magnetic parameters of lf, IRMs and HIRM₂₁₀ suggest that there are significant changes in the concentration of ferrimagnetic minerals in the sediment cores, indicating changing sediment sources and/or increasing concentrations of spheroidal carbonaceous particles and the dissolution of minerals through reduction below the oxidised layer within the sediment core.     

同时满足多个阻尼反应谱的人造地震动时程合成

应用Ｍ．Ｈｉｒａｓａｗａ和Ｍ．Ｗａｔａｂｅ（１９９２）提出的方法,进行了相应的数学推导：即以满足某个阻尼比的反应谱的人造地震动作为初始时程,采用奇异值分解法,通过解线性方程组求出校正时程,并多次叠以逐步辐近     

地史重大转折期的环境变化学术讨论会综述

概述了地史重大转折期的环境变化学术讨论会４个方面的主要科学内容：古生代与中生代之交的全球环境变化,泥贫纪弗拉期与法门期之交的全球环境变化,元古宙与显生宙之交扔全球环境变化和地史重大转折期环境变化的研究方法。围绕上述内容,评述了发言人和专题发言人的主要科学资料和科学思想以及本次会议形成的共识。     

库车坳陷地质结构及油气带预测

利用油气地震勘探成果和露头的岩性资料 ,对库车坳陷地震层序进行划分 ,初步认为第三系膏盐层和三叠 -侏罗系煤层及泥岩是分布比较稳定的区域性软弱层 ,构成了区域内的主要滑脱面。将库车坳陷划分 6个构造带 ,对库车坳陷的构造样式进行归纳总结 ,并结合典型实例 ,采用平衡地质剖面技术对重要剖面进行地质平衡解译 ,使库车坳陷地质结构更加清晰。结合该区油气成藏的地质条件 ,划分出若干油气聚集带 ,对各油气聚集带进行分别评价     

内蒙古乌达地区早二叠世早期植物群

通过对内蒙古乌达地区早二叠世早期山西组植物化石进行研究,共鉴定出植物化石７属１１种,即Ｔｉｎｇｉａｃａｒｂｏｎｉｃａ（Ｓｃｈｅｎｋ）Ｈａｌｅ,ＴｐａｒｔｉｔａＨａｌｅ,ＰｌａｇｉｏｚａｍｉｔｅｓｃｆｏｂｌｏｎｇｉｆｏｌｉｕｓＨａｌｅ,ＳｐｈｅｎｏｐｔｅｒｉｓｎｏｒｉｎｉＨａｌｅ,ＳｎｙｓｔｒｏｅｍｉＳｚｅ,ＳｔｅｎｕｉｓＳｃｈｅｎｋ,ＰｅｃｏｐｔｅｒｉｓａｎｄｅｒｓｏｎｉＨａｌｅ,ＰｌａｔｉｖｅｎｏｓａＨａｌｅ,Ｔａｅｎｉｏｐｔｅｒｉｓｓｐ,Ｃａｕｌｏｐｔｅｒｉｓｓｐ,ＰｔｅｒｏｐｈｙｌｕｍｄａｉｈｏｅｎｓｅＫａｗａｓａｋｉ。研究结果表明,这些植物化石均为华夏型分子,可以和华夏植物区的一些同期植物群进行对比。根据植物群的总体组成,该区山西组植物群的地质时代属于早二叠世早期,大致相当于阿谢尔期（Ａｓｅｌｉａｎ）至萨克马尔期（Ｓａｋｍａｒｉａｎ）。     

P–T–t paths and post-metamorphic exhumation of the Day Nui Con Voi shear zone in Vietnam

The Day Nui Con Voi belt in Vietnam is the southeasternmost part of the Red River shear zone in Asia. It is a narrow high-grade metamorphic core complex consisting of garnet–sillimanite–biotite gneisses, mylonite bands, amphibolite layers and migmatites. Geothermobarometric study of the complex revealed that the peak metamorphism took place under amphibolite-facies conditions of 690₋₆₀⁺³⁰°C and 0.65±0.15 GPa and the subsequent mylonitization occurred under greenschist-facies conditions of 480°C and under 0.3 GPa. Fifteen synkinematic hornblende and biotite separates from gneisses, amphibolites and mylonites were dated with the K/Ar method. Hornblende separates from the Day Nui Con Voi give K–Ar ages of 26.4–28.5 Ma, and the biotite separates do give 24.5–24.7 Ma. Combination of thermobarometric and geochronological data yields the cooling history of 500°C at 28 Ma and 300°C at 24 Ma with a cooling rate of 70–110°C Ma⁻¹, and 23 km post-metamorphic exhumation of the core complex. The first 16 km exhumation from the peak of metamorphism (at probably 31 Ma) to 28 Ma was triggered by the left-lateral strike-slip displacement of the Red River shear zone.