四川省冕宁县小沟地区碱交代作用及其与铀矿化的关系
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摘要
小沟地区的碱交代岩发育,碱交代作用较强烈。通过对其一般地球化学特征和演化特征及碱交代成矿作用进行研究分析,认为该区的碱交代岩与一般的碱质交代特征一致,总体上,SiO_2减少,由正常花岗岩的70%~74%,减少到56%~65%;碱质增加到7.5%~10%,钠质和钾质均有变化,且以钠质交代为主;成矿具有由碱性流体到酸性流体的演化特征,是在氧化环境下、从高温到中低温热液成矿过程。小沟地区的碱交代体和构造对铀矿化起到了双重控制作用,碱交代体是铀矿化的有利围岩,碱交代作用在一定程度上使活动铀增多,造成了铀元素的局部富集,为进一步成矿提供了基础。
The alkali metasomatite was developmentary in xiaogou area,alkali metasomatism comparatively intense.Through analysis of geochemical characteristics,evolution characteristics and Metallogeny of the alkali metasomatite,realized the characteristics of alkali metasomatite in this area was accordance with generic alkali metasomatite:on overall,its SiO_2 content was lessened,reduced from 70%~ 74% of normal granite to 56%~ 65%;alkali raised to 7.5%~10%,K_2O content and Na_2O content were both changed,and mainly with K_2O metasomatise;its mineralization has the evolution characteristics from alkaline fluid into an acidic fluid,was in oxidizing environments,from high temperature to low temperature hydrothermal ore-forming process.The alkali metasomatite body and tectonic played dual control to uranium mineralize,it was favourable wall rock of uranium mineralize,on a certain extent alkali metasomtism increased the content of active uranium,caused uranium partial enrichment,provided the basis for further mineralization.
引文
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