新疆东准库布苏金矿床石英矿物标型特征及找矿评价意义

新疆东准库布苏金矿床石英矿物标型特征及找矿评价意义张旺生高怀忠吕瑞英（中国地质大学,武汉４３００７４）关键词石英标型特征找矿评价东准噶尔新疆１金矿成矿阶段石英的一般特征库布苏金矿位于新疆东准噶尔野马泉南约１６ｋｍ,矿区所属构造单元为西伯利亚板块准噶...     

莺歌海盆地中央泥底辟带气田水地球化学特征及其油气地质意义

以莺歌海盆地东方区和乐东区气田水样品水化学常规分析为切入点,利用气田水矿化度、水型、钠氯系数(变质系数)、脱硫系数,氯镁系数等参数,深入分析了两区气田水地球化学特征及水化学组合参数特征,并判识对比了两区气藏封闭程度及其保存条件。在此基础上,结合莺歌海盆地天然气成藏地质条件,重点剖析了两区气田水分布规律及成因控制因素,探讨了两区气田水与天然气运聚成藏之间的成因联系。强调指出,两区气田水具有相似的形成演化特征,天然气保存条件好,但对比两区气田水的水化学组合参数,乐东区天然气保存条件稍差于东方区;东方区气田水以NaHCO3水型占绝对优势,其分布规律与断裂系统存在密切联系。该区水文地质开启程度差,气藏盖层封闭性好,有利于天然气富集成藏。乐东区气田水类型多样,成因复杂,天然气保存条件较好但相对东方区稍差。两区气田水具分区分块分布规律,莺歌海盆地泥底辟及其伴生热流体活动对气田水成因及分布规律与天然气运聚成藏等均具有重要控制作用和影响。     

贺兰山中段震旦系盖帽白云岩的沉积特征、区域对比及意义

2011年,作者在贺兰山中段腰坝配件厂地区进行1∶5万区域地质调查时发现了震旦系盖帽白云岩,进而研究了其沉积特征、碳氧同位素组成和时代,并与该区紫花沟兔儿坑组白云岩、华南和华北地台南缘相应地层进行对比.结果表明,盖帽白云岩为含陆源细碎屑白云岩,与兔儿坑组白云岩相近;其δ13C值为-4.7‰～0.79‰,且自下而上呈下降趋势;其时代与华南震旦系下、中部相当,与华北地台南缘震旦系罗圈组的沉积特征和古地理环境相近;与全球Gaskiers冰期有相关性.这对华北地台的古构造、古地理、古气候及动物演化“源头”的研究有重要意义.     

Study of charge structure and radiation characteristic of intracloud discharge in thunderstorms of Qinghai-Tibet Plateau

The comprehensive observations on lightning discharges were conducted in Naqu area of Qinghai-Tibet Plateau in summer of 2002. The electric structures of thunderstorms and the characteristics of lightning discharges at initial stage were analyzed by using the observation data. The results show that most of intracloud (IC) lightning flashes were polarities inverted in thunderstorms with tripole electric charge structure and occurred between negative charge region located in the middle of the thunderstorm and positive charge region located at the bottom of the thunderstorm. The radiation characteristics of discharge processes in cloud with longer lasting time involved in Cloud-to-Ground (CG) lightning flashes were similar to that of IC discharges.A lot of radiation pulses were produced in these discharge processes. Because the IC discharges took place at the bottom of thundercloud and were near the ground, they may produce more serious damage to equipment on the ground therefore should not be neglected in lightning protection.     

Summer weather characteristics on the Grove Mountain of East Antarctica

The summer weather characteristics of the Grove Mountain, East Antarctica, are presented based on the data obtained by Chinese National Antarctic Expedition (CHINARE) in January 1999. The result shows that the pattern of daily variation of temperature and the prevailing wind direction in Grove is similar to that of Zhongshan Station. However, the daily range of temperature and strong wind frequency are much higher than those of Zhongshan Station. The change of wind direction is close to the weather system that impacted the Grove Mountain. The warm and wet air from northern parts often causes the precipitation. The clear weather appears when controlled by eastern winds in January.     

五原4.2级地震前后地震波形分析

通过仿真和各种滤波方法分析处理了2005年2月27日五原M84．2级地震前后震中附近几个台站的地震记录资料,对五原4．2级地震出现的波形异常现象分析后发现,仪器的幅频特性、不均匀构造以及传播路径很可能是主震波形出现异常的原因。     

甘肃陇南地震滑坡体自然恢复5a后植被群落分布特征

以甘肃陇南地震滑坡体自然恢复过程中植被群落为研究对象,以坡面为尺度,采用样带结合海拔梯度的方法进行了调查。根据野外调查资料,应用生物多样性的原理和方法分析了甘肃陇南地震滑坡体自然恢复5 a后植被群落结构特征及多样性空间分布的变化情况。结果表明试验区内主要植物以菊科和禾本科植物为主,群落垂直结构明显,大体分为3层;该群落中一年生草本植物种类最多,是该群落中处于优势地位的生活型;在7个样地中,随着海拔升高,Shannon-Wiener多样性指数(H′)的变化趋势和Pielou均匀度指数(E)的变化趋势基本相同,均呈现先增大后减小的单峰趋势,Margalef丰富度指数(R)和Simpson优势度指数(C)表现出基本相同的变化趋势,均表现出先减小后增大再减小的偏峰格局势,峰值偏向高海拔区。     

坡麓相斜坡软土特性及其地质灾害防治研究

结合工程实例．提出“坡麓相斜坡软土”的概念,论述西南煤系地层地区斜坡软土的形成机理、分布规律、物理力学特征及其工程特性,研究斜坡软土对工程的危害及其地质灾害防治对策,最后列举三个典型斜坡软土工程整治实例,对指导工程实践具有重要意义。     

碎裂蚀变花岗岩型铀矿的赋矿岩石特征

本文着重论述了碎裂蚀变花岗岩型铀矿的赋矿岩石特征：即岩石原始铀含量高；岩石碎裂强度大；岩石蚀变强烈；岩石组分简单，有利于铀的浸出（有害元素含量低）。这些特征可以作为识别与寻找该类型铀矿床的岩石学依据。     

The relative importance of physicochemical factors and crustacean zooplankton as determinants of rotifer density and species distribution in lakes adjacent to the Yangtze River, China

The planktonic community of freshwater Rotifera in 27 subtropical lakes was studied to assess the relative importance of physicochemical factors and crustacean zooplankton as determinants of rotifer density and species distribution. Factor analysis and multiple linear regressions showed that 21.9% and 29.9% of the variance in rotifer density was explained by physicochemical factors and crustaceans, respectively. Larger rotifer density was possible in shallower lakes with higher concentration of inorganic nitrogen and less herbivorous crustaceans such as Sinocalanus dorrii and Daphnia. Redundancy analysis showed that the variances of rotifer species distribution explained by crustaceans and physicochemical factors were 26.9% and 31.0%, respectively. Further analysis demonstrated that the variances explained by pure crustaceans and pure physicochemical factors were 12.5% and 16.6%, respectively. However, these two percentages were not statistically different. Rotifer species distribution was strongly associated with Chl a and Moina micrura. Their coexistence with crustaceans seemed to be determined by their defense against potential predators and competitors.