辉长岩—英云闪长岩—花岗岩—水体系在15kb时的相关系并应于分异作用及深熔作用

在15Kb不同含水量条件下测定了三类岩石—辉长岩、英云闪长岩及白云母花岗岩相关系,这三类岩石代表了钙碱性岩石系列的趋势。实验时使用了Ag-Pd或Pt装样管,是在0.5英寸的活塞-气缸高压装置中做的。所获结果对说明岩石的相关系是令人满意的。为了使玻璃、石榴石、单斜辉石、角闪石及斜长石的电子探针分析取得可靠的结果,所选用的含5％H_2O的一些实验使用了Au装样管(直到Au的温度极限)完成的,以克服铁丢失所导致的后果。在辉长岩的实验中未获得供分析的玻璃。对于一些矿物及液体的共生对来说,这些资料证明KD值是温度的函数。化学成分的差异被用来评价(1)增厚的大陆壳或上地幔顶部55km深处含水岩浆的分离结晶趋势及(2)增厚地壳深熔作用的产物。在该深度,含水玄武岩的分离结晶或辉长岩及英云闪长岩或它们的变质相当物的深熔作用,似乎生成钙碱性趋势的液体。花岗岩深熔作用产生的液体中含SiO_2较其本身要低,带有正长岩的某些化学特征。     

A Study on Hydrogen Peroxide in the Atmosphere

Hydrogen peroxide (H2O2 ) concentrations were measured at two sites. One was on Lushan Mountain in May, 1987. The other was in Beijing in August, 1987 and in December, 1986. The automated fluorometric method was used for the determination of H2O2 . The concentrations of H2O2 ranged from approximately 0.50 to 4.32 ppb on Lushan Mountain. The concentrations of H2O2 ranged from approximately 0.05 to 1.49 ppb in August in Beijing, and it was only 0.01 ppb in December in Beijing.     

The Microstructural Characteristics of Fault Rocks from the Wasatch Fault Zone in Utah (USA) Under Polarizing and Electronic Microscope and Its Seismogeologic Significance

The microstructures of fault rocks from the Wasatch fault zone in Utah (USA) have been studied using a polarizing microscope,a scanning electron microscope (SEM) and an ultrahigh-voltage electron microscope (HVHM).This fault zone may be recognized as one a with long history of seismic activity according to the microstructural characteristics such as type, deformation characteristics,melting structure and surface textures of the fault rocks.However,the main fault now present seems not to have been noticeably active since the late Pleistocene (Q_3),as shown by the eroded-surface texture on the quartz fragments in the fault gouge.Meanwhile,those faults supposed to be strongly active in modern times are branching faults much closer to the basin side and are covered by the Holocene sediments in the basin.     

皮下水文与斗淋及多边形喀斯特的发育

导言从司维治(Cvijic)1893年发表《喀斯特现象》一书以来,关于溶蚀斗淋的认识很少有所发展。对于斗淋为什么出现于这些灰岩区而不出现于那些灰岩区还没有令人信服的解释;对斗淋盆状形态形成的过程也还没有定量的说明。     

巴西里格兰德诺特省厄波迪流域视电阻率资料的解释

作为巴西厄波迪流域水文地质研究工作的一个组成部分,作了112个对称四极装置垂向电测深点。大部分资料已采用带有快速数字滤波正演算法的自动波峰回归反演算法作了解释。结果,反演费用非常低廉。由于正问题求解速度和精度的提高,还允许根据电位差(代替电场)计算对称四极装置视电阻率。因此,无论是在采用很大测量电极距(MN)的地区,还是在电阻率差异比较显著的成层大地上因改变MN极距而造成曲线不连续的地区,解释资料都没有困难。     

雅鲁藏布中新生代深水沉积盆地形成和演化(Ⅲ)——喜马拉雅被动大陆边缘构造沉降分析

喜马拉雅特提斯中、新生代属印度板块北部被动大陆边缘。对充填这个被动大陆边缘的沉积物用“反剥法”(backstrippiog)进行研究,恢复了从被动大陆边缘到前陆盆地的抓降史。对分离出的盆地构造沉降曲线与McKenzie模式图版进行对比相关性分析,判断认为被动大陆边缘成熟期主要为热耗散沉降,前陆盆地时逆冲推覆动力为主要影响因素。     

ECONOMIC CONSIDERATIONS OF A CONTINENTAL SEDIMENT MONITORING PROGRAM

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