摘要
通过对区域地质、构造和岩相古地理的研究,从成矿阶段的角度,将控矿因素分为背景控矿因素、沉积控矿因素、改造控矿因素。得出:背景因素为区域性盆地沉积环境形成条件;沉积控矿因素直接控制了工区石盐矿层的层理形态;改造控矿因素中,局部构造对矿层的改造是矿区盐层多呈背斜分布且轴部较两翼矿层大幅变厚的原因,钾石盐出现在光卤石矿层顶部是因为上部裂隙水或者封存的老卤水向下侵蚀光卤石矿层顶部,溶蚀了溶解度相对较大的MgCl2,而溶解度相对较小的KCl被保留下来,从而多在上盐层光卤石矿顶部形成再生或次生钾石盐矿。
Through study on regional geology, structure and lithofacies paleogeography, from the aspect of mineralization, ore - controlling factors can be divided into background of ore - controlling factors, deposi- tion ore - controlling factors and transformation ore - controlling factors. It is concluded that background ore - controlling factors are the forming conditions for sedimentary environment of regional basins; deposi- tion ore- controlling factors directly control the bedding patterns of the rock salt layers; while in transfor- mation ore - controlling factors, the transformation of local structures to layers will cause the salt - bed distributed in anticline, and the salt- bed in axis partis are thicker than in the wings. Sylvite occurred on the top of carnallitebed, because the upper fracture water or old brine eroded carnallite - bed from the top to down part, and eroded MgCl2 with relative high solubility, while KCl with relative low solubility was preserved. Thus, recrystallized or secondary crystallized halite had been formed on the top of carnallite bed.
出处
《山东国土资源》
2012年第4期15-18,29,共5页
Shandong Land and Resources
关键词
钾盐
岩相古地理
控矿因素
老挝东泰
Potassium salt
lithofacies paleogeography
ore - controlling factors
Dongtai in Laos
