Antimony Mineralization at the Gold Deposits of the Ob-Zaysan Folded Zone(Southern Siberia and Western Kazakhstan).

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Multi Stage Epithermal Au-Ag Mineralisation in the Kiziltepe Deposit, Western Turkey: Evidence From 3D High Resolution CT Scanning

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甘肃省河流天然水化学特征的分布规律及控制因素分析

依据甘肃省108条主要河流、128个监测站点近60 a的水质监测资料,对全省河流按天然水化学特征的分布规律及控制因素进行研究.结果表明:甘肃河流的天然水化学分布状况可根据主要离子浓度接近、水化学类型趋同原则,划分为祁连山区、甘南高原区、黄土高原干旱区、黄土高原半湿润区和陇南湿润区5大区域;全省河流加权平均的主要离子浓度整体略高于全黄河流域均值,但明显高于全长江流域均值.主要离子中Cl-、Na+的空间变异性最大,而HCO-、Ca2+空间变异性最小,SO42-、Mg2+居中;主导水化学特征变化的主要因素是径流深,各主要离子与径流深之间存在显著的相关性,径流深<120 mm相关性最为显著,径流深>120 mm相关性减弱,优势离子在径流深5～46 mm区间内根据径流深的变化而转换,表现出随径流深变化的规律性.     

Geology and geochemistry of the granitic rocks and associated dykes, East Gabal Nuqra, South Eastern Desert, Egypt

A crescent-shape granitic stock and associated dykes is located to the East Gabal Nuqra at the extreme western part of Wadi Natash,South Eastern Desert,Egypt.The examined granites are classified as alkali-feldspar granites and mainly consist of quartz,potash feldspars,plagioclases,and aegirine-augite.Xenotime,zircon,apatite and allanite are accessories representing the source of Y,U,Th and REEs in these rocks.These granites are characterized by high K2O,Na2O and Zn contents and Rb/Sr ratio.Also,they are highly enriched in high field strength elements(HFSE),especially Zr(1529×10-6),Nb(100×10-6),Hf(91×10-6) and Y(624×10-6) and light rare-earth elements(LREE,141×10-6) concentrations and strongly depleted in Ca,Mg,Sr and Eu contents.These features suggest that they are similar to A-type granites(type-2).The rhyolite dykes and granites have similar geochemical characteristics whereas the chondrite-normalized REE patterns show a LREE enriched feature with strong negative Eu-anomaly,whereas the REE pattern of trachydacites show slightly fractionated pattern with no Eu-anomaly.It is suggested that the trachydacites were generated by small degree of partial-melting deep-seated basic source.Such liquid,when subjected to fractional crystallization involving separation of plagioclases as residue,generated the alkali-feldspar granites.And further fractional crystallization gave rise to the alkali rhyolites.The igneous rock suite originated from metaluminous to alkaline trachytic magma,and was developed in a within-plate tectonic environment.The extension caused by NW-SE right-lateral shear in area led to the emplacement of the alkali-feldspar granites.The later extrusion of the alkali rhyolite and trachydacite dykes was due to cauldron subsidence.     

黑河中上游段河道渗漏量计算方法的试验研究

通过河道断面法对黑河中上游河段河道渗漏量进行了比测试验,结果表明:河床岩性组成、河流平面几何形态变化以及人类活动对输水方式的改变等对河道渗漏量影响显著.黑河实施全流域调水前后河道渗漏量发生显著的跳跃性变化,莺落峡至312桥区间河道渗漏量调水前为1.2543×108 m3,调水后为4.3747×108 m3,调水后较调水前河道渗漏量增加3.1203×108 m3;河道流量越小其相应损失率愈大,河道流量越大,其相应损失率愈小,由此得出各河段不同流量单位河长的损失率服从倒数函数分布.研究结果是在黑河中上游实体河道上进行上下断面流量比测试验的基础上得出的,符合该河段的实际情况,可作为黑河中游地表水、地下水转化分析、地下水流系统模拟、流域水资源重复利用、水量调度计算各种模拟模型验证河道渗漏量的基础资料.     

黄河流域寒潮天气与凌情关系分析

利用1951～2008年冬季(11月至翌年3月)各月气温资料,统计分析了近50年黄河流域的寒潮天气过程,阐述了寒潮时空分布规律、变化特点、强度和影响范围。分析了寒潮天气与黄河凌情的关系及对凌情的影响,得出黄河流域寒潮天气在时间和空间上的分布是不均匀的,位于高纬度地区的宁蒙河段寒潮发生频率高于黄河下游,寒潮的强度也强于黄河下游,寒潮覆盖的范围也大于黄河下游;黄河流域以一般性寒潮天气最多,历史上强寒潮发生的次数非常少,除了磴口站发生过3次外,流域其他站均未发生过;20世纪80年代中期以后寒潮的活动呈现出逐步减少的趋势,冬季寒潮发生趋于平静;黄河流域50%的封河是寒潮天气造成的;冬季寒潮天气多封河天数也多;冬季寒潮过程次数多、降温幅度大、持续时间长、最低气温低时,黄河下游封河长度将较常年明显偏长。     

In situ methods for measuring thermal properties and heat flux on planetary bodies

The thermo-mechanical properties of planetary surface and subsurface layers control to a high extent in which way a body interacts with its environment, in particular how it responds to solar irradiation and how it interacts with a potentially existing atmosphere. Furthermore, if the natural temperature profile over a certain depth can be measured in situ, this gives important information about the heat flux from the interior and thus about the thermal evolution of the body. Therefore, in most of the recent and planned planetary lander missions experiment packages for determining thermo-mechanical properties are part of the payload. Examples are the experiment MUPUS on Rosetta's comet lander Philae, the TECP instrument aboard NASA's Mars polar lander Phoenix, and the mole-type instrument HP³ currently developed for use on upcoming lunar and Mars missions. In this review we describe several methods applied for measuring thermal conductivity and heat flux and discuss the particular difficulties faced when these properties have to be measured in a low pressure and low temperature environment. We point out the abilities and disadvantages of the different instruments and outline the evaluation procedures necessary to extract reliable thermal conductivity and heat flux data from in situ measurements.     

The nature of orbits in a prolate elliptical galaxy model with a bulge and a dense nucleus

We study the transition from regular to chaotic motion in a prolate elliptical galaxy dynamical model with a bulge and a dense nucleus.Our numerical investigation shows that stars with angular momentum Lz less than or equal to a critical value Lzc,moving near the galactic plane,are scattered to higher z,when reaching the central region of the galaxy,thus displaying chaotic motion.An inverse square law relationship was found to exist between the radius of the bulge and the critical value Lzc of the angular m...