Aureoles of Songshugou Alpine-type ultramafic massif

The Songshugou Alpine-type ultramafic massif intruded into the surrounding plagioclase-amphibole schists where high-temperature aureoles are found well exposed but not distroyed. From the outer part inwards, four aureoles are recognized: the oligoclase-hornblende zone, the andesine-hornblende zone, the garnet zone and the pyroxene zone. Toward the massif, systematic variations are noticed in the rocks from one zone to another, i.e., the rocks vary from fine-grained, fibrous, crystalloblastic texture to medium coarse-grained, granular, crystalloblastic texture and from schistose structure to massive structure; hornblende varies from blue-green to brofn; plagioclases vary in composition from An_12–17 to An₃₇, even to An₆₀ near the contact; garnet and pyroxene become more and more abundant; sphene is replaced progressively by titanomagnetite; and Na(K), Al and Ti in the hornblende tend to increase near the contact. Studies have shown that the typical rocks in the four contact metamorphic zones are generally similar in major and trace elements. But different mineral assemblages and mineral chemistry indicate that the rocks were formed under different physical conditions.     

Compositional conversion of feldspathic phase in granitoids and its application to rock-forming temperature calculation

Based on the data on plagioclase number of granitoids and whole-rock chemical analysis, the author has proposed that the percentage of molecules of albite in the coexisting plagioclase and alkali-feldspar can be obtained by direct conversion through a petro-chemical approach. Then, the result is substituted into the formula of J. A. Whitney and J. C. Stormer, Jr. (1975, 1977) to work out, the temperatures at which the coexisting feldspars crystallized, i.e., the possible rock-forming temperature of granitoids. Rock-forming temperature values computed by this method as described in the present paper are in good agreement with those by other geothermometries.     

大气降水对昆明周围地震活动的调制

本文对比分析了昆明周围地区20余年来的大气降水记录和地震资料,指出旱涝变异确实与地震活动存在着一定的统计联系。其中尤以震前一年洪涝的作用较为突出。在此基础上,提出了一个可预测本区中强地震发生的经验性方法。     

非矩形网格上的车贝雪夫展开

本文指出:在任意不规则的非矩形二维网格上,若采用两步展开的做法,即首先逐行展开,再按列展开就可以对在该网格上给定的函数实现二维车贝雪夫多项式展开。这一推广在实用上有很大的意义。     

Lithofacies features and mechanism of formation of “Zihe-type” time- and strata-bound iron ore deposits in central Shandong province

The Lower Palaeozoic system is a series of iron-bearing rocks consisting mainly of shallow sea-fades carbonates. On the basis of microfacies analysis of the carbonate rocks, the Lower Palaeozoic sedimentary sea basin is divided into two broad sedimentary-tectonic regions of four sedimentary facies and eight subfacies. The original iron-rich carbonates were deposited in saltlakes, lagoons, etc. of the restricted basins. Over the long geological history, the original iron formations were reconstructed to various extents by late tectonic processes. Geological observations and studies on the equilibrium mechanism of oxygen/sulfur isotopic fractionation and the composition and temperature of fluid inclusions in the minerals indicate that thermal brines played an important role in reworking of the original iron-rich carbonate rocks, which led to the formation of sedimentary-reworked strata-bound ore deposit.     

岩体倾覆的多块体分析

倾覆是岩体失稳破坏的主要方式之一。岩体的倾覆可能呈单块体状,即岩体在其失稳的过程中仍保持其整体性;也可能呈多块体状,即岩体在其失稳的过程中分裂成多个块体,各块体之间产生差异运动,岩体发生解体。对倾角陡立的层状结构岩体及其有条块状结构的岩体,这种多块体倾覆较为常见。     

某些方解石单晶的光学质量评价

本文用光学方法检查了经野外地质工作者挑选过的天然方解石单晶的光学质量。发现部分晶体的光学均匀性很差,晶体中的光散射颗粒很多,不能满足作为光学介质的要求。     

青藏高原地形对孟加拉湾热带气旋动力影响的模拟实验研究

本文以流体动力学模拟实验的方法,初步揭示了青藏高原地形,对移到高原南侧25°N附近的孟加拉湾热带气旋的地形效应.这种大地形的动力作用,对以不同路径靠近高原的孟加拉湾热带气旋的影响是不同的. 我们给出了三种不同路径移近高原的孟加拉湾热带气旋的上、中、下层水平流场及垂直剖面结构,并计算了它们在上述各层的风速径向分布.     

机载热红外扫描在岩溶水文地质中的应用

<正> 由地面资料评价一个地区地下水的排泄地段,已经有了一套比较成功的方法。然而,地面方法相对来说所需要的时间长,花钱多,尤其是在那些交通不便,人们难以到达的地区。四十年代以来,随着航空地质工作的发展,借助于航空摄影所提供的地形、植被类型、地层产状以及破裂等资料来分析地下水的补给和排泄关系。     

Experimental Study of Failure Zone in Soil and Rock Blast

In this paper, according to in situ experimental data of sonic, seismic, hole television, acceleration, velocity and visual investigaton after explosion, we consulted laboratory experimental results. Study in soil and rock blasr destroy effect and zone. By comparing with blast destroy zone of rock mass, vartical tunnel, parallal tunnel.