云南墨江金厂金矿床黄铁矿标型特征研究

黄铁矿在云南墨江金厂金矿床中广泛出现于蛇纹岩、黄铁铬绢英岩、硅质岩和石英脉中。通过对与黄铁矿成因产状密切关联的热液演化阶段的划分、黄铁矿的晶形统计、黄铁矿的热电性研究、黄铁矿的电子探针分析、黄铁矿所赋存的含金岩矿石标本中金品位化学分析，确定了与成矿物质来源——金厂蛇纹岩化镁质超基性岩、硅质岩和可能隐伏的酸性侵入岩有关的系列成因标型。在对黄铁矿热电标型的均方差参数的自然对数值(lnMp)与金品位自然对数值(lnTg)的相关性研究基础上，提出当lnMp值接近4．1时，金的品位值接近二业开采标准。金厂金矿体与镍矿体尽管空间上分离，但近镍矿体与富金石英脉中黄铁矿的共生元素组成成分表明金、镍矿体中部分矿质具有同源同期的特征。此外，全厂组硅质岩和可能的隐伏岩体在成矿物源和热源方面的贡献不容忽视。     

Shallow SH-wave seismic investigation of the Mt. Angel Fault, Northwest Oregon, USA

The Mt. Angel Fault is likely one of the most active faults near the Portland metropolitan area, and was probably associated with the 1993 Scotts Mills earthquake. SH-wave seismic techniques used to image the Mt. Angel Fault suggest that the fault offsets late Pleistocene gravel (22 to 34 ka) at several locations. Within the study area, displacement of the late Pleistocene gravel along the strike of the Mt. Angel Fault increases from no obvious displacement on the northwest to approximately 18 m on the southeast. This trend of increasing offset along the strike of the fault is paralleled by topographic and geomorphic trends. A reconnaissance geologic investigation at an anomalous bend in the Pudding River near the projected trace of the Mt. Angel Fault revealed potential tectonic deformation in sediments younger than the late Pleistocene gravel imaged by SH-wave data. The results of this study have contributed to the paleoseismic record of the Mt. Angel Fault, laid the groundwork for future geologic investigations along the Pudding River, and determined potential sites for future paleoseismic trenching investigations.     

江西洖村微细粒型金矿床地球化学勘查模式

论述江西村微细粒型金矿床地球化学异常、异常与蚀变矿化关系、异常模式以及找矿有效的结论性认识。     

陇南阳山金矿床流体包裹体研究

陇南的阳山金矿床是中国人民武装警察黄金部队近年来在陕甘川交界地带发现的一个特大型金矿床。该矿床 3 0余件样品的流体包裹体分析结果表明 :1.镜下石英中流体包裹体类型丰富多样。据室温状态下流体包裹体的相态、加热状态下流体包裹体的性状及产出特征 ,鉴别出两种成因类型及九种物理状态类型 ;2 .流体包裹体显微测温结果显示本区的均一温度主要集中在 2 60～ 3 10℃ ,2 2 0～ 2 40℃ ,15 0～ 190℃等三个区间 ,流体组份体系接近于NaCl-H2 O -CO2 体系 ,,成矿流体密度估计在 0 .3 5～ 1.0 2 g·cm- 3之间 ,成矿压力估计小于 1Kbar ,流体包裹体盐度估计在 2 .5～ 6.5wb %NaCl之间 ;3 .从流体包裹体成分分析获得的 pH值在 6.91～ 7.1之间 ,还原参数H4 +CO +H2 /CO2 的摩尔数比值在 0 .0 0 9～ 0 .0 5之间 ,具有浅成中偏碱性和弱还原环境成矿特点 ;4.石英中流体包裹体的δD( -SMOW ) 值在 -92 .4‰～ -62 .9‰之间 ,δ1 8O石英 ( -SMOW ) 值在 -3 .0 9‰～ +0 .41‰之间 ,δ1 8OH2O( -SMOW ) 值在 -12 .13‰～ -8.48‰之间。综合分析认为成矿可能主要与低温热液作用有关。     

熊耳裂谷火山岩系金-多金属矿床成矿模式

应用热水成矿理论，首次提出豫西熊耳群裂谷火山岩系金—多金属矿床成矿矿源卤水是火山期后高温硅钾卤水，认为该区金—铅—锌—银—多金属矿床为火山期后高温硅钾卤水成因，成矿作用以硅钾卤水交代、充填及热水沉积为主，形成完整的火山热液成矿系统，主成矿时间为熊耳期。     

Geotechnical characterization and rockfall simulation of a slope: a practical case study from South Tyrol (Italy)

Rockfalls occur often along the state road SS241 Val d'Ega in the Val d'Ega Valley (South Tyrol, Italy). In order to protect the road and the traffic, stabilization works are necessary. Detailed geological and geomorphologic mapping along structural and geomechanic sections was carried out, and experimental rockfall trails were examined on the slope above the state road between km 3.550 and 3.830. Rockfall simulation, rock mass classification and an interpretation of field data, especially concerning joints, wrapped up the investigations. They helped find the specific need for stabilization work and its positioning along the slope. The stabilization works were completed on February 2002. Another important aspect concerns ongoing geotechnical investigations and stabilization works urgently realised during autumn 1999.

This paper is a practical approach in solving rockfall problems along public roads. It should be considered as a workbook for university personnel and also for professional geologists.     

安山质熔结凝灰岩中凹凸棒石断层岩的矿物学特征

郯庐断裂带肥东段龙山安山质熔结凝灰岩中产出一种白色断层岩。X-射线粉末衍射(XRD)、红外光谱(TER)、扫描电子显微镜(SEM)、透射电镜(TEM)、电子能谱仪(EDS)、X-射线荧光光谱(XRF。)等结构、形貌和成分分析证明，这些白色断层岩主要由凹凸棒石组成(含量大于90％)，属于凹凸棒石断层岩。凹凸棒石呈现40-60纳米的细长纤维，其中的少量杂质是纳米粒度的石英和钠长石。纳米粒度的石英和钠长石形态特征显示它们可能由安山质熔接凝灰岩中原生矿物机械破碎形成。这些凹凸棒石断层岩形成于火山热液活动同一期断层递进变形过程中，经历了三个阶段。首先是安山质熔结凝灰岩在断裂作用下形成碎粉岩，然后是碎粉岩在构造应力和火山热液作用下水化形成凹凸棒石，最后凹凸棒石又在断层活动晚期发生变形。     

国道G316线天水市稍子坡滑坡群成因分析

国道316线天水稍子坡段(K2556—K2562)滑坡十分发育，是甘肃境内滑坡灾害最为严重的路段之一。特别是雨季或丰水年，滑坡活动频繁，对公路安全运营造成很大危害和威胁。1999年及2000年雨季该路段发生滑坡灾害15处，正在改建的公路路基30％被破坏，增加工程投资2000多万元，并拖延了工期。本区滑坡多为老滑坡的复活，具有发育密集、复活性强等特点。特殊的地质构造及易滑地层广泛分布，老滑坡的发育和独特的水文地质条件是该滑坡成群发育的地质基础。大量降水入渗，不合理的人为开挖和填方活动是滑坡的主要诱发因素。     

支盘灌注桩应用效果的调查分析与研究

从支盘灌注桩的工程特性、在建设工程中的适用性、支盘桩的设计和在推广应用中需进行提高,以及调研结果和推广应用意见等方面详细阐述和分析了支盘桩的应用效果、推广前景及需进一步改善的问题,该桩型已为岩土工程工作者所接受,并逐渐应用于各个领域。     

The engineering geology of the Tabarak Abad Dam

The Tabarak Abad Dam on the river Tabarak, a branch of Atrak river, is located about 25 km of northeast of Quchan city in the northeast of Iran. The dam is now under construction and will be completed in 2002. The Tabarak Abad Dam has been designed as an earthfill dam with a clay core. The dam and its associated concrete structures are mainly founded on limestone and shale of the Shoorigeh formation of Upper Jurassic to Lower Cretaceous age and limestone and sandstone of the Tirgan formation of Lower Cretaceous age. These rocks are affected by high jointing and faulting especially in the surface. This paper discusses the site investigation for the dam.