河南省禹州市地质灾害与防治预案

禹州市是河南省地质灾害大市。通过对该市地质灾害的表现形式、形成条件、诱发因素及其危险性的初步评估,提出了地质灾害的防治建议和预案,制定了近、中、远三期具体治理规划和达到的目标,并举出实例来说明建立预警系统和制定防治预案的可行性。     

康定杂岩黑云母、角闪石^39Ar-^40Ar年龄及其意义

通过对康定杂岩黑云母、角闪石 Ar-Ar 年龄研究,得出康定杂岩黑云母、角闪石中 Ar 同位素组成明显存在地质离散,有过剩氩;Ar-Ar 年龄并不反映矿物形成后的变质冷却历史。坪的产生可能是由过剩~(40)Ar 存在于非晶粒边缘的缺陷之中,使其与放射性成因~(40)Ar 具有相似活化能,从而使不同种 Ar 组分等比例释气所致。经计算,样品中过剩氩约占氩总量的16%左右。     

黑龙江省地质资料信息系统建设与应用

黑龙江省地质资料信息系统建设与应用系统收集了1950年以来全省完成的各类地质成果资料和探矿权登记资料,数据库包括地质调查、矿产勘查、综合研究、矿产地成果等内容,入库地质项目4037个,矿产地793个,配置了1842幅矿产地成果图件,共17．8万个属性项。该地质资料信息系统具有数据管理、维护、查询、检索、输出等功能,在地质矿产行业中有广泛的用途。     

TSP在隧道超前地质预报的应用研究

由于隧道施工经常遇到严重的地质灾害,施工前进行超前地质预报是十分必要的。本文介绍了TSP超前地质预报系统的技术特点和基本原理,结合工程实例探讨了在使用TSP过程中的一些技术问题。结果显示利用工程地质调查结论可以确定合理的探测方案和提高TSP的预报精度。     

地质档案原本立卷归档雏议

地质档案原本是地勘单位开展地质工作的重要基础资料,大多是孤本,非常宝贵,但原始资料的立卷归档工作往往不够重视。笔者结合本单位的实际,从存在问题、解决问题中进行分析探讨,并提出解决地质资料立卷归档的主要途径。     

North-south transfer zones and paleo-morphological reconstruction of the Xylokastro area (Corinth Gulf, Greece)

A large number of studies have documented the structural and sedimentary architecture of the Corinth Gulf, especially the major E–W trending normal faults important in accommodating the main extensional strain and associated growth of the Gilbert fan deltas. However, the role of several N–S oriented structures that crop out at the surface and are detectable at depth by seismic reflection and gravity surveys are not clearly understood. Based on new geological data, collected near Xylokastro, we describe the N–S oriented tectonic activity of this area. The mapped inland faults correspond to off-shore structures identified in re-interpreted seismic lines and appear to have acted as a major transfer zone during the opening of the Corinth Gulf. Reconstruction of the paleo-topography based on sedimentary facies and the environment of clay mineral formation suggest these transfer zones played an important role in controlling both local structural relief and depositional conditions of the Gilbert fan deltas.     

西昆仑柳什塔格峰西侧火山岩的特征、时代及地质意义

在西昆仑麻扎-康西瓦-苏巴什结合带的柳什塔格一带发现了一套火山岩建造,主要由强蚀变玄武岩、绿帘阳起石岩、阳起石岩(原岩为玄武岩)组成,上覆少量深水沉积岩。火山岩的岩石地球化学特征表明其主要来源于富集地幔玄武岩浆,形成于洋岛环境,因此它是一个古结合带大洋洋壳的残留。采样作Rb-Sr等时线年龄分析,时代为震旦纪(563±48Ma),说明麻扎-康西瓦-苏巴什结合带所代表的洋盆在震旦纪就已经存在。这个发现对重新认识麻扎-康西瓦-苏巴什结合带的演化时限具有重要意义。     

A classification system for the assessment of slope stability of terrains along highway routes in Jordan

 The establishment of comprehensive development plans, in general, and the proper selection of highway routes, in particular, require an assessment of landslides or instability hazards in the project sites. The frequent landslides that occurred along the routes of major highways in Jordan, and particularly along the Amman-Na'ur-Dead Sea highway and Irbid-Jerash-Amman highway, have substantially increased the cost of construction and caused a considerable delay in the completion of work. The study of many landslides that occurred in the last 25 years along the highway routes and in the sites of some major civil engineering projects in Jordan has led to the recognition of major factors that affect the stability of slopes, and thus the safety and economics of these projects. The geological formation, structural features, topographic characteristics, geometry, and climatic conditions were adopted as the basis for the classification of terrains in terms of their stability. Each factor has been assigned a rating to indicate its relative contribution to the overall stability according to engineering judgment and past experience. The areas have been classified into 5 groups according to their total stability rate. The simplicity, comprehensiveness, and accuracy are the main characteristics of the proposed classification. Its significance stems from its helpfulness as a guide to the geotechnical and highway engineers in assessing the overall stability of the alternative routes of proposed highway projects. Received: 3 December 1996 · Accepted: 29 April 1997     

南京栖霞山地质环境的开发和保护

地质环境是自然环境的一部分,是人类赖以生存的客观地质实体。地质环境的开发利用,保护与改造,在现实生活中往往是比较突出的矛盾。著名的佛教胜地,风景旅游区和重要的多金属矿产基地的南京栖霞山,在这方面就存在许多问题。对之应采取护岸工程,治水,治支,治坡,保护和改造地质环境,限制地下水的开采量,保持地下水资源的供需平衡等措施,是根治栖霞山地质环境问题的基本对策。     

赣西五宝山钴矿床地质特征及成因探讨

五宝山钴矿床是近年普查中发现的一个中型钴矿床,属层控热液叠加型钴矿床。钴矿化产于上三叠统安源组砂砾岩层中,受ＮＥ向逆断层控制,矿体呈似层状或透镜状产出,随褶曲变化而起伏,钴矿体品位在０．０２４％～１．１５％范围变化,平均含钴０．４０２８％。矿石自然类型为砂砾岩型铅锌矿石、铅锌钴矿石和钴矿石,矿石可选性良好。钴矿物主要有辉钴矿和钴毒砂。