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长江中下游地区内生铁铜矿床与膏盐的关系 总被引:12,自引:0,他引:12
A middle-Trlassic sequence of strata composed .of gypsumstlt beds has been reeognized in the middle-lower Yangtze Valley. The mineralization in the gypsum-salt beds is closely related to Yenshanian magmatism, During the Yenshanian, magmatic intrusion activities were very active across evaporite beds, occupying great space in gypsum-salt beds. The magmatie rocks and the alterated country rocks are characterized by alkali-eurichment and halogen-enrichment. Copper and iron ores mainly occur in the evaporite beds or overlying levels. The genesis of endogenic copper and iron ores is commonly considered to be the consequence of interaction of magma with the gypsumsalt beds, i.e. there exists a close genetic connection between evaporites, magmatism and copper-iron ores. These observed features are of great significance both in practice and theory. 相似文献
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长江中下游地区中三叠统蒸发岩中,有石膏层、石盐假晶、"盐霜"和菱镁矿等,表明其原始古海水的浓度已达到石盐结晶阶段.当晚侏罗-早白垩世时,岩浆侵入作用于蒸发岩,从围岩-蒸发岩(T_2)中提供部分盐类物质是完全可能的,同时为内生铁铜矿床的形成创造了有利条件. 相似文献
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<正> 四川盆地三叠系找钾远景,目前有不同的看法。有人认为在该区开展“钾盐普查缺乏现实意义”;持不同观点者的看法是“由于工作程度不够,尚难结论,应通过进一步实践和研究来解决”。1975年潜江油钾兼探会议上,曾提出应注意找成钾有利的“古凹今隆”。这实质上是一个盐盆地构造条件研究的课题。对四川盆地找钾远景认识分歧的原因很多,其中对成盐盆地构造条件认识的不同是最重要的一个方面。下面就这个问题谈点不成熟的意见,供参考和讨论。 相似文献
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