吉林省岩溶洞穴旅游资源及其开发中的问题讨论

近年来，在吉林省中部和东南部地区，发现了一批岩溶洞穴，尚未开发利用者为多数，它们分布在奥陶系马家沟组灰岩和石炭系磨盘山组石灰岩中，规模多为中小型，个别较大，具有开发意义，建议从速开发，面向旅游事业，为振兴吉林省经济服务。     

广东人口迁移机制、特征与走向

８０年代以来广东省活跃的人口迁移，其主要动因是改革开放中广东省与国内其它地区以及省内珠江三角洲与其它地区之间经济的不平衡发展。广东省人口迁移有其显著特征，而区域经济发展水平的差异、产业结构特征及劳动力供求关系的发展等又影响着未来的人口迁移走向。     

改革开放以来广东省区域差异的发展变化

本文主要研究改革开放以来广东省区域差异发展变化的趋势及特点。在确定了研究的方法,采用的指标后,文章从三个方面,及全省区域差异的总体状况;省内各区之间的差异;省内各区内部的差异,分析了广东省1980—1990年区域差异的发展变化。研究表明自改革开放以来广东省的区域差异迅速扩大,且主要体现在珠江三角洲与全省其余各地差异的扩大;虽然在改革开放的初期三角洲内部的差异就比较明显,但1980年以来三角洲呈现出很强的均衡发展的特点;区域差异发展的特点与广东改革开放以来实行的一系列政策有明显的因果关系。最后,文章探讨了缩小广东省区域差异的措施。     

广东省强震台网建设概况

本文论述了广东省强震台网建设的目的和原则,介绍了台网中使用的强震仪,收取的强震记录和处理情况、台网管理及其展望。     

湖北凤梨山铅锌矿床的闪锌矿标型特征及其成因探讨

凤梨山铅锌矿产于中酸性岩浆岩与三叠系海相碳酸盐地层的热接触变质晕内。闪锌矿为主要的矿石矿物。其成矿作用可分为沉积成岩同生成矿期（I）、渗流热水成矿溶液改造富集成矿期（Ⅱ）和热接触变质成矿期（Ⅲ）。本文根据闪锌矿的地质产状、矿物共生组合及成矿作用的特点，对它进行了物理化和化学性质、矿物包裹体特征、硫与铅同位素地球化学的研究，并探讨了它的成因问题。     

Sedimentational,structural and migmatitic history of the Archaean Dharwar tectonic province,southern India

The earliest decipherable record of the Dharwar tectonic province is left in the 3.3 Ga old gneissic pebbles in some conglomerates of the Dharwar Group, in addition to the 3.3–3.4 Ga old gneisses in some areas. A sialic crust as the basement for Dharwar sedimentation is also indicated by the presence of quartz schists and quartzites throughout the Dharwar succession. Clean quartzites and orthoquartzite-carbonate association in the lower part of the Dharwar sequence point to relatively stable platform and shelf conditions. This is succeeded by sedimentation in a rapidly subsiding trough as indicated by the turbidite-volcanic rock association. Although conglomerates in some places point to an erosional surface at the contact between the gneisses and the Dharwar supracrustal rocks, extensive remobilization of the basement during the deformation of the cover rocks has largely blurred this interface. This has also resulted in accordant style and sequence of structures in the basement and cover rocks in a major part of the Dharwar tectonic province. Isoclinal folds with attendant axial planar schistosity, coaxial open folds, followed in turn by non-coaxial upright folds on axial planes striking nearly N-S, are decipherable both in the “basement” gneisses and the schistose cover rocks. The imprint of this sequence of superposed deformation is registered in some of the charnockitic terranes also, particularly in the Biligirirangan Hills, Shivasamudram and Arakalgud areas. The Closepet Granite, with alignment of feldspar megacrysts parallel to the axial planes of the latest folds in the adjacent schistose rocks, together with discrete veins of Closepet Granite affinity emplaced parallel to the axial planes of late folds in the Peninsular Gneiss enclaves, suggest that this granite is late-tectonic with reference to the last deformation in the Dharwar tectonic province. Enclaves of tonalite and migmatized amphibolite a few metres across, with a fabric athwart to and overprinted by the earliest structures traceable in the supracrustal rocks as well as in a major part of the Peninsular Gneiss, point to at least one deformation, an episode of migmatization and one metamorphic event preceding the first folding in the Dharwar sequence. This record of pre-Dharwar deformation and metamorphism is corroborated also by the pebbles of gneisses and schists in the conglomerates of the Dharwar Group. Volcanic rocks within the Dharwar succession as well as some of the components of the Peninsular Gneiss give ages of about 3.0 Ga. A still younger age of about 2.6 Ga is recorded in some volcanic rocks of the Dharwar sequence, a part of the Peninsular Gneiss, Closepet Granite and some charnockites. These, together with the 3.3 Ga old gneisses and 3.4 Ga old ages of zircons in some charnockites, furnish evidence for three major thermal events during the 700 million year history of the Archaean Dharwar tectonic province.     

吉林省南部下元古界集安群地质特征与沉积期古环境分析

根据集安群地质特征,岩石化学,稳定同位素特征分析认为:蚂蚁河组沉积期古环境为强氧化泻湖相;荒岔沟组沉积期为强还原的泻湖相、大东岔组沉积期为开阔正常浅海潮坪相。集安群从发生发展到结束古环境演化规律是:构造上,由优地槽向冒地槽演化,气候上由炎热向温湿演化;古地理环境从有障壁的局限海变为无障壁的开阔海;从咸化海向正常海,从泻湖相向潮坪相转化。     

广东清远—高要金矿的40Ar／39Ar测年

广东新州至高要一带是广东主要的金矿带,那里有著名的河台金矿以及新州金矿和一些有远景的矿点。各地的金矿类型是不同的,关于金矿化时期是根据以往一些间接的地质资料推断的,没有直接的年代学资料。用40Ar/39Ar测年法测定了该地区主要矿床(点)中与金共生的绢(白)云母年龄,根据测年资料将区域金矿化分为四期,其时序是:早侏罗世184—171Ma,晚侏罗世141士6Ma,早白垩世133士2Ma和晚白垩世99士1Ma。     

甘肃及其邻域地壳中间界面的某些性质

本文根据地壳中间界面上反射波的运动学和动力学参数，探测了地壳中间界面的埋深、复盖介质中波的传播速度、温度、压力、反射性、透过性、弹性等性质。