应用地层放射性元素地球化学参数评价地层含铀远景

根据放射性元素地球化学特性和岩相建造理论,作者研究了沉积建造层位中U、Th、K的分布特征,以及它们的组分参数MA、MB同地层铀富集矿化程度的关系,通过不同矿化程度的地层中MA和MB的对比,得出4种类型矿化程度的含铀层位的MA和MB值范围,为采用放射性元素的多参数定量评价地层含铀远景提供了一定经验。     

岩石分级的理论与实践

本文在介绍国际上的两个分级系统和国内的三个单项岩石分级及岩石三性综合分级的基础上，结合实例阐述了岩石分级理论和应用的新进展，并进一步讨论了岩石分级课题在深度和广度两个方面扩展的问题。     

青龙村群及其地质时代

青龙村群在延边地体中具有重要地质意义。笔者通过对该群的工作和所获得的微古化石，认为青龙村群在层序上仅包含该区１：５万区调青龙村剖面中的中、下段，其上段不属于青龙村群范畴；青龙村群的形成地质时代应为晚震旦─早寒武世。     

独龙江流域的地震地质环境

本文利用青藏高原东南边缘及其与印缅山弧交接地带的地震活动性、新构造运动以及地震构造特征等研究成果和实地考察资料，借以分析并初步阐明独龙江流域的地质地质环境，为该区的自然资源开发利用和地震地质灾害预测提供一些实际资料。     

Producer Services Research in the United Kingdom

This paper reviews recent research in the United Kingdom on producer services and suggests directions for further research. A recurrent theme in UK-based geographic research into producer services is the role of service activities, establishments, and trade in uneven development of the UK space economy, a role manifested in uneven provision and quality of services in peripheral regions. During the 1980s, overall growth in demand for producer services and the rapid rise in metropolitan London real estate costs reduced London's dominance, but these trends moderated by the end of the decade. In the absence of adequate government statistics, regular and standardized surveys are needed to compile a time series of service change in the United Kingdom. Directions for continued empirical research include the role of producer services in innovation and technology transfer, the implications of information technology for the location of employment in the sector, and the impacts of productivity increases on employment and wages.     

Interpretation of210Pb profiles and verification of the CRS dating model in PIRLA project lake sediment cores

This paper reports results and analysis of²¹⁰Pb-activity measurements in 51 lake-sediment cores from 32 lakes in the four PIRLA (Paleoecological Investigations of Recent Lake Acidification) project regions (Adirondack Mountains [New York], Northern New England, Northern Florida, and the Northern Great Lakes States). General application of the Constant Rate of Supply (Constant Flux) model for²¹⁰Pb dating is valid for lakes in the PIRLA study, although application of the model is equivocal in a few lakes.²¹⁰Pb inventories and profiles are replicable among closely spaced cores within a lake. Specific²¹⁰Pb activity in surface sediments is negatively correlated with bulk sediment accumulation rate in seepage lakes, but not in drainage lakes. Drainage lakes with lower pH have lower unsupported²¹⁰Pb inventories in sediments, but the relationship does not occur in seepage lakes.²¹⁰Pb profiles in only seven of the cores, all from either the Adirondacks or the northern Great Lakes states, exhibit exponential decay curves. Deviations from an exponential profile include a flattening of the profile in the top few cm or excursions of one or a few measurements away from an exponential curve.²¹⁰Pb dates typically agree with other chronostratigraphic markers, most of which are subject to greater uncertainty. Several hypotheses, including sediment mixing, hydrologic regime, sediment focusing, and acidification, are proposed to explain variation of²¹⁰Pb distribution among lakes and regions. Hydrologic factors exert control on unsupported²¹⁰Pb inventories in PIRLA lakes, and there is a strong focusing effect in drainage lakes but a weak focusing effect in seepage lakes.This is the third of a series of papers to be published by this journal following the 20^th anniversary of the first application of²¹⁰Pb dating of lake sediments. Dr P. G. Appleby is guest editing this series.     

X射线荧光技术用于西秦岭地区金矿勘查

本文根据用轻便型X射线荧光仪在西秦岭数个金异常区测量金的伴生元素——砷的荧光强度,间接找寻金矿的实践,阐明用该仪器可快速圈定金矿远景区和揭示隐伏金矿体,提高找矿效果。并对使用X射线荧光技术进行现场测量及配合金异常查证工作,作了初步探讨。     

郯—庐断裂带南延入湖南的质疑

郯—庐断裂带纵贯中国东部,规模巨大,长期、多次活动,对该区的地质发展,岩浆活动和矿产的分布均起到重要的控制作用。目前,地学界对其北段和中段的存在已无异议,但南延问题仍处于众说纷纭的争论局面。笔者通过对郯—庐断裂带基本地质特征的认识,并与湖南、江西存在的深大断裂进行对比,同意前人将郯—庐断裂带与赣江断裂相连的意见,认为它南延进入湖南的可能性不大。     

惯性测量系统中垂线偏差和重力异常的确定

本文对惯性测量各项系统误差及异常重力场进行了分析和研究,并在此基础上建立了两种用于惯性重力测量的估算模型;模拟计算的结果表明,所建模型在原理上是可靠的,结果是令人满意的;同时,本文较为详细地分析了各项系统误差对异常重力元素估计精度的影响,对卡尔曼滤波应用中的有关问题进行了讨论。     

吉林省北部西土山火山岩的地质特征及其形成的地质时代

本文以实际资料，叙述了西土山火山岩的地质、岩石化学、微量元素、稀土元素等方面的特征。与中国晚三叠世火山岩对比较吻合。且以较丰富的古生物及同位素年龄资料论证了西土山火山岩的地质时代属晚三叠世。