Neogene volcanism and Holocene earthquakes in the Tanlu fault zone, eastern China

In this paper, we study the relationship between Neogene volcanism and Holocene earthquakes in the Tanlu fault, eastern China. We find that fault segments through which Neogene and Quaternary magma have extruded do not show Holocene slip because they are covered by unfaulted basalts. In contrast, fault branches that are away from the Quaternary volcanic centers display Quaternary faulting and are responsible for earthquakes as recorded both historically and geomorphologically. Therefore, magma intrusion appears to modify fault activity in two different ways: (1) within the faults, the cooling magma serves as a cohesion or barrier, welding the faults so that they become stronger in resisting slip; (2) beneath the faults, the upwelling magma promotes slip of faults above the magma body, and hence generation of earthquakes. Physically, the first case results from contraction of the cooling magma, which causes a relative increase in fault-normal stress so that the fault failure resistance is enhanced. The second case results from the upward dynamic force and the heat brought in by the magma body, both of which cause the effective fault-normal stress to decrease so that the fault failure resistance is reduced. That could explain why earthquakes occur on faults bypassing the volcanic centers as typified in the Yishu fault zone and in the regions where heat flows are relatively high as shown in the Bohai Bay area.     

三种锰硅酸盐矿物的鉴别及其研究意义

蜡硅锰矿，粒硅锰矿，鉴别，研究意义     

A Study on the Geological—Geochemical Dynamics of Hydrothermal Ore Deposition as Exemplified by the Muping—Rushan Gold Deposit Belt,Eastern Shandong,China

This paper presents a method of establishing a hydrothermal ore-forming reaction system.On the basis of the study of four typical hydrothermal deposits,the following conclusions concerning geochemical dynamic controlling during hydrothermal mineralization have been sions concerning geochemical dynaamic controlling during hydrothermal mineralization have been drawn:(1)The regional tectonic activities control the concentration and dispersion of elements in the ore-forming process in terms of their effects on the thermodynamic nature and conditions of the ore-forming reaction system.(2)During hydrothermal mineralization the activites of ore-bearing faults can be divideb into two stages:the brittle splitting stage and the brittle-tough tensing stage,which would create characteristically different geodynamic conditions for the geochemical thermodynamic ore-forming system.(3)The hydrothermal ore-forming reaaction system is an open dynamic system.At the brittle splitting stage the system was so strongly supersaturated and unequilibrated as to speed up and enhance the crystallization and differentiation of ore-forming fluids.And at the brittle-tough tensing stage,the ore-forming system was in a weak supersaturated state;with decreasing temperature and pressure the crystallization of oreforming material would show down,and it can be regarded as an equilibrated state.(4)In the lates stages of hydrothermal evolution,gold would be concentrated in the residual ore-forming solution.The pulsating fracture activite in this stage led to the crush of pyrite ore and it was then filled with gold-enriched solution,forming high-grage“fissure”gold ore.This ore-forming process could be called the coupling mechanism of ore formation.     

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     

江西利山金矿床地质特征及控矿构造

本文较系统地阐述了利山金矿床的各项地质特征，并重点就控矿构造问题进行了总结讨论，认为ＮＷＷ向断裂带严格控制了所有金矿体的产出。ＮＮＥ、ＮＮＷ向断裂与ＮＷＷ向断裂带的交汇部位控制了富矿段的产出。在此基础上初步探讨了矿床成因及找矿方向，这对该地区的找矿评价和开发均具有实际意义     

Windows95下帮助系统的开发策略和技巧

Ｈｅｌｐ是能够为用户提供快捷访问的联机帮助信息。现在，研制联机Ｈｅｌｐ帮助系统已成为软件开发过程中必不可少的项目之一。正如其它的任何工程项目一样，Ｈｅｌｐ的制作也需要精心地策划和编排，需要充分发挥Ｈｅｌｐ开发软件的功能，以制作出满足用户要求的高水平的联机帮助系统。笔者就这些方面的内容，论述了开发Ｗｉｎｄｏｗｓ９５下的联机帮助系统的基本原则及使用Ｈｅｌｐ开发工具的一些技巧。     

焦作矿区电法探测导,含水构造的效果

应用直流电法仪在井下进行了工作面巷道底板电测深和掘进头超前探测，查清了工作面底板水层的富水性和掘进头前头的地质构造及含水情况。目前，大部分探测结果已得到生产实践的证实。     

义马新安煤矿特大型奥灰突水的治理

采用“上阻、中栏、下堵”的立体堵水方法，封堵了义马新安煤矿1995年11月5日发生的特大型（4257m3／h）奥灰突水通道，解放被淹矿井，堵水效果良好。     

Characteristics of dynamic equilibrium for natural gas migration and accumulation of the gas field in the center of the Ordos Basin

The gas field in the center of Ordos Basin has been conventionally considered as a large gas pool with thin reservoirs. However, lots of phenomena contrary to this concept occur in the exploration and production process. It is proposed that the gas field is composed of many small lithological gas pools, sourced from and reservoired in the same Ordovician formation which is an underpressured fluid compartment. A dynamic equilibrium moldel of natural gas migration and accumulation has been developed to illustrate the formation mechanism of these gas pools.     

下辽河坳陷现代应力场特征

本文通过辽河油田的钻孔崩落资料及小地震震源机制解，推断出辽河坳陷地区现代构造应力场的特征。两种方法得到的结果基本一致，即区域应务场和局部应力场的结果一致，该地区处于走滑断层型应力状态。