滇东南微细浸染型金矿构造控矿型式

滇东南微细浸染型金矿的形成与该区构造关系密切,总体受右江裂谷系控制。主干断裂严格控制金矿的带状分布,次级断裂进一步控制成矿带内矿体的具体空间位置或定位。认为逆冲推覆构造为该区微细浸染型金矿的控矿构造型式,归纳出该区微细浸染型金矿在构造中的分布规律,并据此提出新的找矿思路与找矿方向。     

内蒙古凤凰山金矿床地质特征

凤凰山金矿产于古硐井-英雄山近EW向构造带凤凰山背斜构造仰起端层间虚脱部位.矿区出露地层为中—上元古界浅海碎屑岩-海相碳酸盐岩建造的中深变质岩系,构造呈近EW向,主要有古硐井-英雄山复背斜、凤凰山背斜构造及多头山-狮子山北断裂带,岩浆活动以华力西中晚期似斑状黑云母二长花岗岩为主.矿石自然类型为蚀变岩(硅化角砾岩)型,主要矿物组合为自然金-磁铁矿-黄铁矿-赤铁矿,矿石为碎裂结构、角砾状构造.地球物理特征表现为低阻、高极化率,地球化学元素共生组合为Au、Zn、As、Sb.金矿体厚度大、品位偏低,属微-细粒型金矿.矿床成因初步认为是构造破碎蚀变岩型.     

Evaluation of tsunami impacts on shallow marine sediments: An example from the tsunami caused by the 2003 Tokachi-oki earthquake, northern Japan

A combined approach of field geology and numerical simulation was conducted for evaluating the tsunami impacts on the shelf sediments. The 2003 Tokachi-oki earthquake, M 8.0, that occurred on 25 September 2003 off southeastern Hokkaido, northern Japan, generated a locally destructive tsunami. Maximum run-up height of the tsunami waves reached 4 m above sea level. In order to estimate the tsunami impacts on shallow marine sediments, we compared pre- and post-tsunami marine sediments in water depths of 38–112 m in terms of grain size, sedimentary structure, and microfossil content. Decreases of fine fractions, especially finer than very fine sand, which led to coarsen the mean grain size, were detected in the inner shelf of the northern part of the study area. Foraminiferal assemblages also changed in the coarsened sediments. On the other hand, the other shelf sediments largely unchanged or slightly fined. We also simulated the tsunami wave velocity and direction, and grain size entrained by the modeled tsunami. The numerical simulation resulted in that the 2003 tsunami could transport very fine sand in water depths shallower than 45–95 m at the northern part of the study area. This is comparable with the actual grain-size changes after the tsunami had passed. However, some storms and tidal currents might also be possible to stir the surface sediments after the pre-tsunami survey, so we could not conclude that the grain-size changes had been caused only by the tsunami. Nevertheless, a combined approach of sampling and modeling was powerful for estimating the tsunami impacts under the sea.     

澜沧县阿佧白铅多金属矿成因初探

阿佧白矿为铅、锌、铜、银、金、锡、锰等多金属矿床,应是多构造控制,矿质受上覆泥岩阻挡,后期分异交代而成。     

胶东牟平金矿矿石、硫化物钕同位素组成及地质意义

山东牟平金矿是胶东半岛东部近年来探明及开采的赋存于花岗岩岩体中的大型石英多金属硫化物脉状金矿床。含金多金属硫化物的钕同位素研究表明牟平金矿的成矿物质具有多源性，即来自成矿作用同期的镁铁质胶岩和控矿围岩昆嵛山花岗岩。结合前人对昆嵛山花岗岩，镁铁质脉岩，金矿床的成矿成岩时代及碳、氢、氧等同位素研究，得出成矿流体来源于脉岩岩浆水和广泛淋滤围岩的大气降水的混合。文章不仅阐明了慢源物质在金的成矿作用过程中起了重要的作用，而且表明钕同位素是示踪热液型脉状金矿床成矿物质及成矿流体来源的有效手段之一。     

辽西地区中生代火山岩型金矿成矿地质条件与找矿方向

辽西地区地处我国东部中生代火山活动带，火山岩发育，已恨现二道沟，红石砬子和大青山等火山岩型金矿床（点），研究了该区火山岩型金矿的成矿地质条件，矿床特征和找矿标志，提出了红石砬子，温滴楼，小塔子－马岱沟，大青山－影壁山等找火山岩型金矿有望地区。     

矿床数学—经济模型及其在元江金矿的应用

利用地质统计学的原理和方法，编制出矿床数学－经济模型软件包，它作为一种储量计算和矿床经济评价方法。介绍了该软件包各模块的功能，并以元江金矿应用为例，展示了该软件包的功能及效果。     

姚安金矿床成因机制研究

姚安金矿床矿石品位富，载金矿物及其共生矿物组合较为特殊，复杂。从含矿段岩石组合，围岩，含金矿石，含金矿物及火山－次火山侵入岩的稀土元素和微量元素特征，结合矿石的同位素及包裹体分析资料对比研究认为：（1）成矿金质来源于围岩（侏罗系碎屑岩）和火山－次火山岩；（2）金成矿滞后于岩浆岩的侵入期，与构造活动同期或稍晚。     

澜沧老厂银铅锌铜多金属矿床成因探讨

总结老厂银铅锌铜多金属块状硫化物矿床地质特征的基础上，重点讨论老厂矿床存在的早石炭世火山喷流沉积成矿作用、中晚石炭世火山期后喷流沉积成矿作用及燕山期～喜马拉雅山早期（中）酸性岩浆热液叠加改造成矿作用，建立老厂多因复成矿床成矿模式。     

滇东磷块岩及工业磷矿床成因

滇东地区存在两套含磷岩系，十个磷块岩层位，可归纳为三类成因、四个工业磷矿层，进一步划分为四个沉积阶段、四个工业磷矿床成矿区。其中，研究较深的中谊村段磷矿，是由成矿地质背景和环境因素控制的八种主要成矿作用和四个成矿富集阶段多重反复叠加形成的生物沉积磷块岩矿床。