豫西小秦岭金矿区的一组^40Ar／^39Ar定年数据   总被引：25，自引：5，他引：20  

徐启东  杨发城 《地质论评》1998,44(3):323-327

本文提供了一组小秦岭金矿区的＾４０Ａｒ／＾３９Ａｒ定年数据。根据地质体的形成温度和被测定矿物封闭温度之间的关系,讨论了各个年龄的地质含义。认为东闯钾长花岗岩墙和文峪二长花岗岩体分别形成于印支期和燕山早期,主要金矿化发生在文峪二长花岗岩体已固结之后（１３２Ｍａ）,自１．３Ｇａ以来,本区遭受过的区域性热事件温度不会超过３５０℃。  相似文献   

内蒙古大青山地区主要金矿床矿化特征及成因   总被引：10，自引：4，他引：6  

徐九华  谢玉玲 《地质与勘探》1998,34(6):14-20

大青山地区金矿床主要类型为绿岩型热液金矿床,乌拉山群为重要的矿源层。固阳－武川断裂控制了金矿田的总体分布。构造岩发育,热液蚀谱强烈的地段是有利的成矿地段。成矿流体具低盐度,ＣＯ２／Ｈ２Ｏ较高的特点。氢,氧,碳同位素组成特征表明,成矿热液与区域性成矿期岩浆活动有关,并受大气降水影响。矿石硫具幔源和下地壳源性质。梁前经后石花至松树曳一线的山后断裂附近,是很有前景的成矿带。  相似文献   

Experimental study on the competitive adsorption of metal ions onto minerals   总被引：2，自引：0，他引：2  

Wu Daqing  Diao Guiyi  Peng Jinlian 《中国地球化学学报》1998,17(3):213-220

The study on the competitive adsorption shows that the magnitude order of metal ions adsorbed onto oxide and silicate minerals in near-neutral solution with low ionic strength is in mole/nm² as follows: CaCO₃ > quarte > hydromuscovite > kaolinite > Ca-montmorillonite > goethite > gibbsite. These minerals can be divided into three groups according to their surface equilibrium constantsK _M of the adsorption reactions, which are the function of the dielectric constants ε of the absorbent minerals. The relationships between constantsK _M and mineral dielectric constants ε are described as follows: lgK _M ¹ = 7.813-26.15/ε lgK _M ² = 9.030-26.15/ε lgK _M ³ =11.63-26.15/ε for the adsorption reaction: >SO^- + Mⁿ⁺≥SOM^n-1)+ (n = 1, 2, 3) The first group of minerals include quartz, goethite, 1:1 phyllosilicates and other oxide minerals; the second: gibbsite, brucite and 2:1 phyllosilicates; the third: carbonate, sulphate and phosphorate minerals. The appearance reaction constants have a variation of magnitude ±0.5 for different metal ions with the same mineral. This project was financially supported by the National Natural Science Foundation of China (No. 49572091).  相似文献   

Geochemistry of sedimentary rocks and its relation to crustal evolution and mineralization in Southwest Yangtze Massif, China     

于炳松  裘愉卓等 《中国地球化学学报》1998,17(3):265-274

Through a systematic study on trace elements and REE geochemistry of mudstone deposited in the basin and lower slope environments during Upper Proterozoic to Triassic in the Southwest Yangtze Mssif,three geochemical abnormal horizons of which the geochemical characteristics are quite different from those of other horizons have been established for the first time.They are the Lower Cambrian,the Upper Devonian and the Upper Permian,As compared with the crustal evolution in this area.these three geochemical abnormal horizons are corresponding to the pulling-apart periods of geotectonic cycles.which illustrates that uncommon depositional sources puring into the basin from the earth‘s interior may be one of the most important causes to originate the geochemical anomalies in these lhrizons.Thus it can be realized that the geochemistry of post-Archean sedimentary rocks has a great deal to do with the crustal evolution and it can be used as a tracer to analyze the crustal evolution.The elements in this area are mainly concentrated in these geochemical abnormal horizons,and the degree of enrichment and deficiency of trace elements in other horizons is very limited.A series of research on mineralization indicates that the main strata-bound ore deposits discovered in the Southwest Yangtze Massif occur in the Cambrian,Devonian and Permian-Trassic strata.The results of isotope tracer resarch have also proved that most of the metallogenic elements in these ore deposits came from the host strata.which illustrates that the geochemical abnormal horizons may have made great contributions to these ore-forming processes.Thus it can be concluded that it is only the particular horizons corresponding to the particular periode of earth‘s evolution that can they be the significant source beds because only in these uncommon horizons there can be highly enriched metallogeinc elements.which may be one of the most important reasons for explaining the time-bound nature of mineralization.  相似文献   

苏州花岗岩中钽矿化机理的研究     

聂桂平 《江苏地质》1998,22(1):23-26

苏州花岗岩岩体中稀有元素含量远高于克拉克值,在岩体中Ｔａ／Ｎｂ比值从下向上逐渐升高,边缘相中Ｔａ含量要比内部相高出４～５倍,氧同位素分析表明边缘相样品δ１８Ｏ的亏损是受到雨水交换作用的强烈影响。综合考察苏州花岗岩边缘相的雨水交换与富集稀有元素的岩浆体系之间的关系,可以认为苏州花岗岩在演化结晶至晚期时,在顶部和边缘与雨水热液作用,导致岩浆物理化学条件改变,使稀有元素络合物发生解体,从而发生Ｔａ矿化作用。  相似文献   

穆龙套矿床的原生地球化学晕   总被引：3，自引：0，他引：3  

С.  ВХ 张锡濂 《国外地质勘探技术》1998,(2):17-23

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恒山—五台山金银矿床成矿区带构造变形与金银矿化的关系     

李敏敏 《华北地质矿产杂志》1998,13(3):293-295

恒山—五台山金银矿床成矿区带东西横跨五台山隆起和燕山沉降带两上Ⅰ级构造单元。因此,兼备不同构造单元金银成矿作用特征,前者以五台群火山—沉积变形变质热液再造型金矿床成矿系列为主,尽管矿体（脉）不都沿层产出,但层控特征明显,以不整合产出的层控矿床类型为主...  相似文献   

澳大利亚博丁顿红土型金矿床简介     

Symo.  PM 叶水泉 《江苏地矿信息》1998,23(5):133-135

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小干沟二长岩的发现及其地质意义   总被引：11，自引：3，他引：8  

张炯飞 《贵金属地质》1998,7(1):68-70

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滩间山金矿田岩浆岩特征及其与金矿化关系   总被引：2，自引：0，他引：2  

国家辉 《贵金属地质》1998,7(2):96-103

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