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根据岩石沉积类型、物源供给、成因机制和沉积序列 ,结合区域地质特征 ,将兰坪盆地三叠系划分为陆相火山泥石流、河流相、三角洲相、潮坪相、浅海陆棚相、碳酸盐台地相和深水盆地相7种主要沉积类型。通过对沉积相的详细分析 ,恢复其古地理格架和面貌 ,探讨岩相古地理的变迁历史 ,从而表明三叠纪早期到晚期 ,其古地理经历了陆相环境→碎屑海盆→碳酸盐海盆到碎屑海盆的转换 ,即两次海侵 海退旋回。早期的海域分布范围较小 ,晚期的海域分布范围较宽 ,并成为统一的海盆。
According to the types of sedimentary rocks, the provenance of sedimentary rocks, the sedimentary facies and sedimentary sequence, and the regional geological features, the Triassic of the Lanping basin is divided into volcanic mudslides, fluvial facies, deltaic facies, tidal flat facies, shallow marine shelf facies, There are seven main types of sedimentary facies in the acid salt platform and the deep-water basin. Through the detailed analysis of the sedimentary facies, the paleogeographic framework and facies recovery were restored, and the paleogeographic change history of the lithofacies was discussed, which indicates that the paleogeography of the Triassic experienced the transition from continental environment to detrital basin to carbonate Salt basin to the crumbs basin transformation, that is, two transgression sea regain back. The early waters have a relatively small distribution, the late ones have a wide distribution and become a unified sea basin.