安徽铜陵地区蚀变流体填图方法的探讨

蚀变流体填图是一项区域流体地质调查研究工作 ,也是一项具有战略意义的、综合性的基础地质研究工作。区域大面积的流体填图工作的理论依据、思路方法、填图要素、技术要求和规范等还没有一套成熟的方法体系。在实施中国地质调查局和国土资源部科学技术司的“铜陵地区蚀变流体填图”项目中 ,探讨了流体填图的理论依据、思路方法、研究内容和填图要素 ,对填图单位制定了 3级填图单元等级体制 ,即流体系统流体子系统流体单元。在铜陵地区划分出 4个流体系统 ,7个流体子系统和 18个流体单元。     

青海北祁连区中三叠世孢粉的发现及其意义

祁连县俄博乡土圈沟、大擦汗沟、柯柯里等剖面的粉砂岩、砂质页岩、泥质页岩岩层之中，首次发现丰富的孢粉化石，计39属74种(其中包括1新种)，疑源类8属9种。推出Verrucosisporites(8．6％)-Triadispora(2％)-Trematosphaeridium(7．2％)的孢粉组合。该孢粉组合面貌应归于中三叠世Anisian期。它的发现为该套地层的进一步研究与合理归属提供了最新成果。     

西藏纳木错晚更新世以来湖面变化和藏北高原古大湖的演化

根据西藏纳木错及邻区发现的多处湖岸阶地和高位湖相沉积,确定了藏北高原古大湖的存在。水准测量表明,在纳木错沿岸发育了6级湖岸阶地,以及拔湖48～139.2m的高位湖相沉积;在拔湖26m以下,发育有8～30条湖岸堤;一条明显的湖蚀凹槽则集中出现在拔湖17.5～19.8m的高度上,与纳木错和仁错的分水垭口的高度相当。纳木错沿岸和邻区湖相或湖滨相沉积物的铀系年龄测定表明,高位湖相沉积形成于115.9～71.8kaB.P.的晚更新世早期;第6至第2级阶地形成于53.7～28.2kaB.P.的晚更新世中晚期;与湖蚀凹槽相当的湖滨相沉积则稍早于29.3kaB.P.;第2至第1级阶地,14C测定结果为2350～10390aB.P.。     

一次区域性大暴雨环境特征分析

通过对冀东南、鲁西北一次区域性大暴雨的分析表明：除有利的大尺度环流背景以外，超低空急流是大暴雨不稳定能量和水汽的主要输送者，高能区不稳定能量释放，产生大暴雨所需的强烈上升运动。暴雨落区与超低空急流前部最大风速切变区的位置密切相关。     

N同位素质谱分析及其数据处理

本文论述了N同位素质谱分析原理和钢瓶高纯氮标定方法。同时对影响N同位素分析分馏因素作了相应讨论，指出钢瓶子高纯氮同位素标定，要用纯化后的大气氮定值。     

Study on the Gravity Field and Deep-Seated Crustal Structure at the North Margin of the Qinghai-Tibet Plateau

1.I~ductionThenorthernmarginoftheQinghai-TibetplateauincludestheAltllnMis.,theQilianMis.,KunlunMis.,theQaidambasinandthesouthernTarimbasin.ThisareaistCctonicallycharacterizedbyintensiveCenozoicdeformationwithcomplicateddeformationalmechedsm(Molnaretal.,1987;Zheng,1991;Culetal.,1994;Ding,1995andXuetal.,1996).Thedeformationalmechanismsincludethrust-napping,strike-slipping,extensionandblockrotation,aswellassimultaneousupliftingandtypicalbasin-rangetectonics(CulandXu,1996).IntermsofCenozoi…     

24位地震数据采集器时间格式转换的实现

应用C语言编写四字节24位采集器时间编码与七字节时间编码间的相互转换程序，并可在单片机上运行。为24位采集器与计算机和外界设备间建立透明时间编码通道。     

内蒙古中部中--晚志留世西别河组的划分和时代

华北板块北缘早古生代造山带的稳定盖层西别河组是顶底清晰，下界不整合覆于早中奥陶世岛弧建造之上，其上被下泥盆统查干哈布组、上石炭统阿木山组不整合覆盖的一套稳定的滨浅海相沉积建造。本次工作根据岩石地层特征划分了砂砾岩段、灰岩段、砂板岩段和巴特敖包礁4个填图单元；在生物地层工作的基础上分别划分了2个珊瑚、腕足化石组合带，确立了该组为中晚志留世地层，即Wenlockian-Pridolian期的沉积。     

Visualization issues in the development of electronic atlas in China

In this paper, we discuss the development of electronic atlas in China, with focus on the issues of visualization. We particularly categorise this development into four periods, and then analyse the characters in each period and discuss the visualization issues. The four periods are highlighted: 1) Infant period (<1990) characterized as computer assisted mapping with products of screen maps; 2) Starting period (1991-1995) characterized as object-oriented mapping with products of interactive maps/atlases; 3) Advancing period (1996-2000) characterized as integrated mapping with products of multimedia cartographic maps; 4) New era (> 2001) characterized as web mapping and adaptive map design with products of Internet maps and atlas as well as adaptive maps. It is obvious that the development follows the logical way from static to dynamic, and even real time visualization, from single user to multiple users, from presentation to exploration for effective communication and knowledge construction. Current research and development projects are focused on customisation of atlas information systems for real-time tasks, Internet operability, small displays and mobile environments. The major challenges involved in each of such customisation processes are identified and commented in relation to the further development of visualization.     

Structure de socle,sismostratigraphie et héritage structural au cours du rifting au niveau de la marge d'Ifni/Tan-Tan (Maroc sud-occidental)

Seismic reflection profiles from the Ifni/Tan-Tan Atlantic margin of southern Morocco, interpreted in the light of well data and field geology from the Western Anti-Atlas, allowed us to establish the seismostratigraphic framework of the syn-rift series and to reveal (i) a compressional structural style in the pre-Triassic basement similar to that established in the adjacent outcropping onshore basement but with an opposed western vergence, (ii) the importance of inherited anterior structures in the formation of Triassic-Liassic rift structures and (iii) an east–west propagation of these rift structures. To cite this article: N. AbouAli et al., C. R. Geoscience 337 (2005).