滇西孟连曼信一带火山岩微枕状构造特征及其地质意义——兼论曼信—老厂一带火山岩时代

首次发现报道了曼信一带海相火山岩微枕状构造的地质特征。主要根据野外第一手资料，分析探讨了曼信—老厂一带火山岩的时代，主要认识是：“依柳组”火山岩的主要形成于晚二叠世；老厂地区泥盆纪—中晚石炭世有少量基性—中性火山活动及三叠纪火山活动。     

含金硫化物基岩区红土型金矿的成矿作用

实验表明，在含金硫化物基岩区，硫代硫酸金络阴离子团和硫酸金络阴离子团是金在表生条件下的主要迁移形式，它们的沉淀与铁、锰氢氧化物的形成有密切联系。金的表生迁移－沉淀条件除一般的表生地质条件外，还有特殊的物理化学－生物化学条件。络阴离子团的地球化学性质，控制着红土型金矿床的垂向分带与金的次生富集。     

鄂西震旦系上统含磷岩系的划分与对比

上震旦统陡山沱组是鄂西地区最具工业价值的含磷地层。著名的磷矿有荆襄磷矿、宜昌磷矿、兴(山)神(农架)保(康)磷矿。迄今已有20多年的勘探史,但由于各矿区研究程度不一,又缺古生物依据,亦不能依靠同位素年龄来作划分对比,故在地层及磷矿层的划分、对比上认识不一。笔者结合磷矿特征及含磷岩系岩类组合、剖面结构特点、稀土元素特征等,将本区划分为4个磷矿分布区,将陡山沱组划分为3个岩性段、5个含磷层位。     

Study on the correlativity of earthquakes impact on cities

Introduction With rapid development and advancement of economy and society, lots of city groups or city belts with ex-tra-large cities as their centers have been formed in China. The regions these city groups lie in usually have well-developed economy, dense population, and are regional politics and culture centers. Some groups lie in the regions with high level of earthquake activity, such as the Surrounding Capital City Group with the centers of Bei-jing and Tianjin. Once a large earthqua…     

地下厂房洞室群岩爆趋势综合预测方法

以拉西瓦水电站地下厂房洞室群原设计方案为例，基于其赋存地质条件调研结果和岩爆产生基本条件，对岩爆趋势进行宏观预测；并结合研究区其他高地应力现象，建立了岩爆预测类比判据。进而基于厂房开挖后二次应力场数值计算结果，以所建判据圈定了岩爆可能发生部位及强烈程度。结果表明，将宏观判据与类比判据结合的岩爆综合预测方法，考虑因素全面，也尊重了研究区实际情况，因而合理可行。     

基于GIS的攀西地区铂族元素成矿地质条件初步分析

攀西地区以良好的铂族元素(PGE)成矿地质背景，而成为我国铂族元素找矿热点地区之一。本文在建立攀西地区铂族元素矿床地质概念模型的基础上，用地理信息系统(GIS)分析了该地区的铂族元素成矿地质条件，包括地质构造、峨眉山玄武岩、基性一超基性岩和铂族元素地球化学异常特征。指出研究区的深大断裂对铂族元素的富集表现出很好的控制作用，峨眉山玄武岩为铂族元素的矿源层之一，岩浆岩为铂族元素的富集提供了成矿物质及成矿能量。     

Electron microscopy study of the sakhaite from endogenous borate deposit in Hunan, China

Sakhaite was first discovered by Ostrovskaya, Pertsev and Nikitina at Siberia in the former Soviet Union. By using the X-ray diffraction technique, they proved that the crystal system of sakhaite was cubic (a = 1.464 nm), its possible space groups were Fm3m, F432, F43m, Fm3, F23, and its crystal chemical for-mula was Ca48Mg16(CO3)16(BO3)28Cl4(OH)8 4H2O[1]. Chichagov, Simonov and Belov studied the crystal structure of synthetic sakhaite and determined that its space group was F4132, …     

山东龙口大顶金矿地质特征及找矿方向

重点介绍大顶金矿区的地质特征及区内主要矿脉体(36号矿脉群)特征，同时，对控矿因素作了一定的分析，初步总结了36号矿脉群在双顶矿段北东缘的成矿规律，指明了本矿区的找矿标志及下一步的找矿方向。     

Plastic flow strength of jadeite and diopside investigated by microindentation hardness tests

Microindentation hardness tests were performed on jadeite and diopside, being end members of the omphacite solid solution series. At temperatures between 300 and 750 °C, the hardness of jadeite ranges from 7.4 to 8.5 GPa, that of diopside from 4.9 to 6.1 GPa. Jadeite is significantly stronger than diopside in the low-temperature plasticity regime. Normalization of the hardness-derived yield stress with respect to the shear modulus considerably reduces the strength contrast. The normalized Peierls stress is identical for jadeite and diopside. This indicates that jadeite and diopside belong to the same isomechanical group. The hardness-derived yield stress for jadeite as well as for diopside is used to estimate flow law parameters for the low-temperature plasticity regime.     

Seismic image of the deep crust at the eastern margin of the Alps (Austria): indications for crustal extension in a convergent orogen

A 39-km-long deep seismic reflection profile recorded during two field campaigns in 1996 and 2002 provides a first detailed image of the deep crust at the eastern margin of the Eastern Alps (Austria). The ESE–WNW-trending, low-fold seismic line crosses Austroalpine basement units and extends approximately from 20 km west of the Penninic window group of Rechnitz to 60 km SSE of the Alpine thrust front.The explosive-source seismic data reveals a transparent shallow crust down to 5 km depth, a complexly reflective upper crust and a highly reflective lowermost crust. The upper crust is dominated by three prominent west-dipping packages of high-amplitude subparallel reflections. The upper two of these prominent packages commence at the eastern end of the profile at about 5 and 10 km depth and are interpreted as low-angle normal shear zones related to the Miocene exhumation of the Rechnitz metamorphic core complex. In the western portion of the upper crust, east-dipping and less significant reflections prevail. The lowermost package of these reflections is suggested to represent the overall top of the European crystalline basement.Along the western portion of the line, the lower crust is characterised by a 6–8-km-thick band of high-amplitude reflection lamellae, typically observed in extensional provinces. The Moho can be clearly defined at the base of this band, at approximately 32.5 km depth. Due to insufficient signal penetration, outstanding reflections are missing in the central and eastern portion of the lower crust. We speculate that the result of accompanying gravity measurements and lower crustal sporadic reflections can be interpreted as an indication for a shallower Moho in the east, preferable at about 30.5 km depth.The high reflectivity of the lowermost part of the lower crust and prominent reflection packages in the upper crust, the latter interpreted to represent broad extensional mylonite zones, emphasises the latest extensional processes in accordance with eastward extrusion.