珲春农坪金（铜）矿床地质特征及成因机制     

刘玉平  李晨晖 《吉林地质》1999,18(4):43-48

农坪金（铜）矿床受控于东西向断裂构造带,产于英云闪长（斑）岩蚀变岩中,与闪长玢岩密切相关。矿床成因类型为次火山热液含金慢变岩型。矿床类型特殊,外围找矿潜力较大,对珲春地区金、铜找矿具有指导意义。  相似文献   

清流玮埔地区花岗岩的时代和岩石序列   总被引：5，自引：0，他引：5  

陈日明  陈兴高 《福建地质》1999,18(1):20-26

清流玮埔岩体曾是福建省印支期代表性岩体之一,出露有一定规模,前人把它作为单一的具片麻状构造黑云母二长花岗岩,在１：５万嵩口坪等４幅侵入岩调查中,全面采用侵入岩岩石谱系调查的新理论和新方法,对该岩体进行详细解体,划分出４１个侵入体,建立７个单元,将其归并为廖武坪序列,玮埔单元,盘兰溪序列,并确定了志留纪,三叠纪和晚侏罗纪３个时期的岩浆活动,在对该岩体的时代划分基础上,对不同时代岩石序列,岩石化学,地  相似文献   

含铁绿柱石的改色机制研究   总被引：7，自引：0，他引：7  

李湘祁  袁奎荣 《矿物岩石》1999,19(4):1-4

含铁绿柱石经γ射线辐照或特定温度热处理,可因铁价态的改变引起颜色发生相应变化。处理前后的吸收光谱和顺磁共振谱研究表明,辐作用使隧道位的Ｆｅ＾２＋氧化Ｆｅ％３＋,八一位上的Ｆｅ＾３＋还原为Ｆｅ＾２＋,热处理使隧道位及八面体位Ｆｅ＾３＋均还原为Ｆｅ＾２＋。  相似文献   

武夷山西麓宁都地区基底褶皱构造式样初步探讨     

周仁元 《江西地质》1999,13(1):8-12

武夷山西麓宁都地区广泛分布一套成层有序的晚元古代浅变质岩系,长期以来被视为单斜构造。本文阐述了研究区基底褶皱的窨配置及褶皱式样,阐明了研究区的各紧密线状复式褶皱隶属区域大型复背斜的北翼,同时地基底褶皱的形成机制与后期改造作了地一步分析和探讨。  相似文献   

多灾种相关性研究进展与灾害综合机理的认识   总被引：5，自引：0，他引：5  

聂高众  汤懋苍 《第四纪研究》1999,19(5):466-475

本文总结了前人关于旱、涝、震灾害相关性研究的一些进展,介绍了目前关于自然灾害综合机理的一些认识。在此基础上,就地下能量对旱、涝、震灾害可能的影响作用和影响过程进行了探讨,认为从多圈层相互作用的角度来看,地下的能量聚散同旱、涝、震灾害可能存在着内在的有机联系。之后,指出了多灾种相关性研究现存的一些主要问题。  相似文献   

A New Method Searching for Concealed Mineral Resources: Geogas Prospecting Based on Nuclear Analysis and Accumulation Sampling     

Tong Chunhan 《中国地质大学学报(英文版)》1999,10(4):329-332

INTRODUCTIoNThemineralresourcescanbehardlyfoundontheexpo-sureornearthesurfacerecent1y.Itbecomesmoreandmoredifficulttosearchfordeep-seatedresourcesoflargeorsuper-largedeposits,orthedeeppartoftheoldmines.Traditionalmethodsinsomecasesarelesssuccessfulinthesearchformetalmineralresourceshundredsmetersbelow.ExplorationactiQnsmoreandmoredependoncomprehensivemethodsandtechniques-Geogasprospectinghasbeendevelopingasanewandnontraditionalmethodforthisquiteurgenttask.Studyofthegeogasprospectingbased…  相似文献   

蒙皂石伊利石化反应机理和框架性行为模式   总被引：1，自引：0，他引：1       下载免费PDF全文

邬金华  许仕策 《地质科学》1999,34(4):498-505

对珠江口盆地两口钻井95个泥质岩样粘土矿物X衍射分析资料的定量研究表明,若反应是以消耗蒙皂石为代价形成伊利石,则反应符合溶解-沉淀机理,但除此以外,蒙皂石还可以净溶解或新增伊利石层的方式加大I/S比。蒙皂石在渐进成岩过程中的框架性行为模式具有三级控制,按顺序分别由温度、基本离子成分和动力学因素控制特定温度段内蒙皂石行为过程的起始和终结、行为过程的方式和行为过程的速率和程度。渐进成岩过程中I/S比的变化主要与第三级控制有关,而游离状蒙皂石和伊-蒙混层粘土的含量变化则是第二三两级共同控制的结果。  相似文献   

Distribution and environmental impact of coal-mining wastes in Upper Silesia, Poland   总被引：8，自引：0，他引：8  

J. Szczepanska  I. Twardowska 《Environmental Geology》1999,38(3):249-258

 About 50 million tonnes/year of waste rock from coal-mining is generated in the limited area of the thickly populated Upper Silesian Coal Basin (USCB) in Poland. There are 380 coal-mining waste dumps, including 76 active dump sites covering over 2,000 ha. About 15-16 million tonnes/year of waste rock is being reused for civil engineering purposes in the same area. This brings about a problem of ground water deterioration by constituents leached from waste rock exposed to atmospheric conditions. The major factors determining the ground water contamination potential from waste rock are chloride salinity, sulfur content and acid generation potential. The concept behind the presented studies was to provide data for correct evaluation and prediction of contaminant release from the waste rock, based on the characterization of coal-mining waste properties, as well as on long-term laboratory, lysimetric and field studies. The results show that coal-mining waste dumps can be a long-term source of ground water contamination, lasting for decades and increasing with time. Ground water down-gradient from the disused 15–30-years-old part of the studied dump displays high and increasing acidification, high TDS, SO₄, and the highest, still increasing concentrations of Mn, Fe and Zn. Cost-effective and efficient pollution control measures, similar to the presented design and construction elements of the dump site, can mitigate the negative environmental impacts. Received: 3 July 1997 · Accepted: 9 September 1998  相似文献   

甲藻赤潮及其毒素的产生机制及夜光藻氮代谢途径   总被引：8，自引：1，他引：7  

周成旭  吴玉霖 《海洋与湖沼》1999,30(4):454-459

依据８０－９０年代国内外有关资料,从甲藻分类、甲藻室内培养、甲藻毒素及其生物合成上方面,综合评述甲藻赤潮及其毒素最新研究进展;并结合作者自己的研究结果,对夜光藻赤潮的生产与调控机理模型提出一种理论假说,这一假说的验证将为全面阐明夜光藻生活史及赤潮成因和机理提供分子水平的框架路径。  相似文献   

Stress Field Estimations for Colima Volcano, Mexico, Based on Seismic Data     

Francisco J. Núñez-Cornú  Claudia Sánchez-Mora 《Bulletin of Volcanology》1999,60(7):568-580

 For first time, during 1991, seismic activity was recorded during an eruption at Colima volcano. We analyze these data to obtain a stress pattern using a composite focal mechanism technique. From the analysis of regional seismicity, the Tamazula Fault and the Armeria River appear as active features and the dip of the slab east of the Jalisco Block is approximately 12°. Southwest of Colima volcano a vertical alignment of seismic events was observed. We estimate five different composite focal mechanism solutions from our data set, which indicate a change of the stress field at the volcano after the 1991 eruption. These solutions suggest that the stress field in the volcanic edifice was controlled by stresses related to the emplacement of magma superimposed on the regional stress field. No evidence of active local faults in the volcanic edifice was found. We propose a model for the eruptive process that involves tilting of the volcanic edifice. Received: 15 October 1995 / Accepted: 26 October 1998  相似文献