Discussion on Induan—Olenekian Boundary in Chohu,Anhui Province, China

This paper proposes a scheme for the definition of the Lower Triassic Induan-Olenekian boundary(IOB) based on investigation of sections in Chaohu, Anhui Province, China as well as data accunulated from other studies elsewhere. The conodont Neospathodus waageni is suggested as the index fossil of the boundary. According to the FAD of N.waageni, the IOB is at the base of bed 25-2 of the West Pingdingshan Section in Chaohu,42.19 m above the Permian-Triassic boundary, and it is slightly higher than the base of the Flemingites-Euflemingites Ammonoid Zone at the section.     

依法整治开山采石 切实保护山体资源——苏州市治理整顿矿产资源管理秩序成效明显

为维护苏州这一著名的风景旅游城市和历史文化名城的风貌，保护全市的山体资源，根据省、市有关规定，苏州市在禁止开山采石的同时，全面开展山体整理复垦和环境综合整治。全市上下统一认识，加强组织领导，深入贯彻省人大的决定，严肃查处各类违法开采行为。到2001年底，已关闭开山采石企业89家，占原有企业的77．4％。已在全省率划定了包括苏州城市规划区和98％以上山地丘陵的开山采石禁采区。     

就地取水改造西北

分析了西北地区水资源状况，认为西北有丰富的地下水资源和巨大的“固体水库”－冰川和雪峰。提出了在试验成功的基础上变“固体水库”为液体水库，就地取水，改造大西北的设想。     

江苏省“十五”期间环境地质工作方向初探

提出了江苏省急需解决的重大环境地质问题；分析了当前和未来社会经济发展对基础性、公益性环境地质工作的需求。在此基础上，确定了对江苏省社会经济可持续发展意义重大的环境地质工作方向。     

内蒙古新巴尔虎右旗查干诺尔地区铀成矿远景分析

查干诺尔盆地位于海拉尔盆地群西部，发育于额尔古纳前寒武纪中间地块之上。该区有利的区域轴成矿地质条件是：盆地西部是最具砂岩型铀矿成矿远景和潜力的单斜构造区，具备成矿的铀源、古气候和含矿主岩条件，发育完善的补给－径流－排泄地下水动力系统；航空放射性测量、地下水水中分析测试，以及地面伽玛能谱测量的铀含量高低，在研究区内具有一定的分布规律。本文通过地质调查、水文和物化探测量，结合钻探成果，综合钻探成果，综合分析了查干诺尔盆地砂岩型铀矿成矿远景，并厘定了5片成矿远景区，即古宁浑迪、冲果勒浑迪、哈沙廷呼都格、安达特浑迪和那尔图远景区。     

锚杆静压桩在危楼托换加固中的应用

结合工程实例，介绍锚杆静压桩法托换加固的原理，施工方法和过程控制，提供处理工程质量事故的一种新思路。     

云铝一期技改总图运输设计的几点设计创新

对云南铝厂一期技改工程总图运输设计进行总结，归纳出几点设计创新和效果。     

Hydrothermal Redistribution of Rare—Earth Elements in Pingxiang Dacite,Guangxi

Distribution of the rare-earth elements (REE) in dacite has been studied so as to get a better understanding of the migration behavior of REE during alteration. Both unaltered and altered samples were collected in an unpolluted area of Guangxi Zhuang Autonomous Region, southwest China. The REE concentrations were analyzed by ICP-MS. It is concluded that the REE were enriched during dacite alteration in varying degrees. The chondrite-normalized REE patterns of altered samples approximately maintain the characteristics of unaltered samples. However, if we normalize the REE concentrations of altered samples with unaltered dacite, fractionation of REE will appear. The LREE are more enriched than HREE in all altered samples with the LREE possibly precipitated as carbonate minerals. Both positive and negative Eu anomalies exist. Enrichment, immobility and depletion are noticed for the element Lu. Heavy mineral alteration, difference in stability constant between carbonate LREE and HREE complexes, downward migration of weathering fluid and microenvironment change may be responsible for the fractionation of REE in the altered dacite.