论文部分内容阅读
通过野外实测剖面和大量室内岩矿工作,首次指出兰坪盆地上三叠统至少存在2套含盐层位,上含盐层位于三合洞组上段(T3s2),盐类物质以石膏、天青石为主,下含盐层位于三合洞组下段(T3s1),以天青石为主。天青石和石膏均呈中厚层层状产出,与顶底板地层产状一致。不同地区含盐层岩石组合及序列不同,横向上不具有可对比性,提出其并非正常蒸发沉积产物的认识。同时,含盐地层又是盆地内铅锌矿重要的赋矿层位,因此上三叠统含盐建造层序的厘定对深化认识区域铅锌矿床成矿机制、指导盐类矿床和铅锌矿找矿具有重要的意义。
It is first pointed out that there are at least two sets of salt strata in the Upper Triassic of the Lanping basin, the upper salt layer is located in the upper T3s2 of Sanhendong Formation, and the salts are gypsum, The main bluestone is the lower salt layer located in the lower part of the Sanhendong Formation (T3s1), dominated by celestite. Celestite and gypsum were layered in a thick layer of output, consistent with the top floor formation. In different areas, the composition and sequence of rocks in the salt layers are different, and they are not comparable in the horizontal direction. Therefore, it is not known that they are not the products of normal evaporation. At the same time, the salt strata is also an important ore-bearing layer of lead-zinc deposits in the basin. Therefore, the determination of sequence of salt formation in the Upper Triassic will deepen understanding of the mineralization mechanism of lead-zinc deposits, guide the salt deposits and lead-zinc deposits Mine has important significance.