Reservoir Diagenesis Sequence and Framework in Intracontinent Rift Basin,East China

ＲｅｓｅｒｖｏｉｒＤｉａｇｅｎｅｓｉｓＳｅｑｕｅｎｃｅａｎｄＦｒａｍｅｗｏｒｋｉｎＩｎｔｒａｃｏｎｔｉｎｅｎｔＲｉｆｔＢａｓｉｎ，ＥａｓｔＣｈｉｎａ＊ＬｉＺｈｏｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ...     

THE PLANNING AND MANAGEMENT INFORMATION SYSTEM FOR SMALL TOWN (TOWNMIS)——A CASE STUDY AT XIAOLAN TOWN, SOUTH CHINA

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＴｏｗｎｐｌａｎｎｉｎｇａｎｄｍａｎａｇｅｍｅｎｔｎｅｅｄｓｖａｒｉｏｕｓｔｏｐｏｇｒａｐｈｉｃａｌｍａｐｓ,ｃａｄａｓｔｒａｌｍａｐｓａｎｄｐｌａｎｎｉｎｇｍａｐｓ,ｓｔａｔｉｓｔｉｃａｌｄａｔａａｎｄｄｙｎａｍｉｃａｌｌｙｃｏｌｌｅｃｔｉｎｇｄａｔａｔｈｒｏｕｇｈｆｉｅｌｄｓｕｒｖｅｙｉｎｇ,ｒｅｍｏｔｅｓｅｎｓｉｎｇａｎｄｏｎｔｈｅｓｐｏｔｉｎｖｅｓｔｉｇａｔｉｏｎ.ＢｅｆｏｒｅｔｈｅｒａｐｉｄｄｅｖｅｌｏｐｍｅｎｔｏｆＧＩＳｉｎｔｈｅ1980ｓ,ｈｏｗｔｏｉｍｐｏｒｔ,…     

印尼中加里曼丹波拉湾煤勘探区的构造解析

本文从区域构造背景出发，根据波拉湾煤勘探区地表及钻孔资料综合分析，建立了逆冲断层Ｆ１、Ｆ２及其配套的ｆ１、ｆ２……构造，理顺了错综复杂的构造格局，将推覆构造理论成功地用于援外生产实践。     

NW断裂构造──鹅公山火山盆地铀矿成矿的关键要素

鹅公山火山盆地受郯庐断裂系影响，ＮＷ断裂构造尤为特色：张扭性，倾向ＮＥ，右行下滑，对盆地中３个铀矿床及绝大多数铀矿（化）点具明显控制作用，是铀矿成矿的关键要素。研究ＮＷ断裂对在鹅公山火山盆地及其它地区找矿都具有实际意义。     

三江盆地七星河区成因地层分析

区内存在５种等时性地层界面，据此将含煤岩系划分为６个成因单元，１０个亚单元。沉积环境经历了５个演化阶段，其中扇三角洲废弃阶段为最有利的聚煤时期。聚煤的有利部位位于废弃的扇三角洲体之上。     

关于成岩作用与变质作用界线的讨论：从沸石相谈起

成岩作用与变质作用界线的划分是当前地质学界关注的焦点之一。传统的观点将沸石相作为最低级变质相，本文以鄂尔多斯盆地东部上三叠统延长组的浊沸碱玫吐鲁番－哈密盆地哈密凹陷三叠系的浊沸石为例，提出浊沸石的形成为高ｐＨ值，低Ｐｃｏ２和Ｘｃｏ２高钙离子活度，高ＳｉＯ２活性的高盐度等，稳定在从８０℃到２００℃左右的广大温度范围内，常与油气生成带一致，属成岩矿物相，取消沸石相，用明确的综合划分标志来确定成岩作用与     

民和盆地上侏罗统湿型冲积扇沉积

本文通过岩相特征、粘土矿物分布、早期成岩矿物组合、微量元素等特征的综合分析，认为民和盆地上侏罗统下部为一较典型的湿型冲积扇沉积。冲积扇扇中发育河道冲刷充填和漫流沉积，而泥石流不发育。沉积层序与现代湿型冲积扇可对比。扇体中粘土岩及早期成岩矿物组合中富含高岭石，应与扇体发育时的潮湿气候和弱酸性流体的较强的淋滤有关。由粘土岩中微量元素因子分析进一步表明，该地层中富硼、钒的特征与相邻非扇相地层明显不同     

瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究

本文介绍了瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究成果：基本查明了应用本方法勘查金矿的主要条件是金矿中伴生有足够的Ｕ，Ｈｇ和碳酸盐矿物；研制成了壤中气（Ｒｎ－ＣＯ２）联测技术，提高了测量质量和探测深部矿体的能力；利用壤中气（Ｒｎ－ＣＯ２）异常进行了成矿预测，并已获得成功。     

Texture and mineralogy of sediments from the Ganges-Brahmaputra-Meghna river system in the Bengal Basin, Bangladesh and their environmental implications

 The Bengal basin, Bangladesh, represents one of the most densely populated recent floodplains of the world. The sediment flux through the basin is one of the highest on a global scale. A significant portion of this sediment load find its sink in the basin itself because of its lower elevation and frequent flooding. The textural, mineralogical and chemical nature of the sediments thus have an important bearing on the environmental quality of the basin as well as for the Bay of Bengal. The sediment load of the Ganges-Brahmaputra-Meghna (GBM) river system consists exclusively of fine sand, silt and clay at their lower reaches within the Bengal basin, Bangladesh, and is deposited under uniformly fluctuating, unidirectional energy conditions. The sediments have a close simitarity in grain size with the sediments of the surrounding floodplain. The mineral assemblage is dominated by quartz and feldspars. Illite and kaolinite are the major clay minerals, and occur in almost equal proportion in bed sediments. The heavy mineral assemblage is dominated by unstable minerals which are mostly derived from high-rank metamorphic rocks. The characteristic smaller grain-size, i.e. having large surface-to-mass ratios, and the mineralogy of sediments suggests that they are susceptible to large chemical adsorptive reactions and thus could serve as a potential trap for contaminants. However, the sediments of the GBM river system in the Bengal basin, Bangladesh, shows lower concentration of Pb, Hg and As, and a marginally higher value for Cd as compared to that of standard shale. Considering population density and extensive agricultural practice in the basin, the sediments can in the long run become contaminated. Received: 9 November 1994 · Accepted: 18 June 1996