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三营组是一套河湖相沉积,沿红河断裂及其西北延伸线分布,主要出露在洱源附近.三营组中夹多层草煤,与下伏三叠系灰岩呈不整合接触,上覆第四纪砾石和松散沉积物.我们通过宇宙成因核素埋藏年龄法定量证明了三营组沉积于上新世,其顶部第四纪砾石层的宇宙成因核素埋藏年龄提供了三营组结束时间:>2 Ma.从空间分布和沉积时间上看,三营组的形成与红河断裂和剑川断裂相关:中新世末期由于红河断裂和剑川断裂的触发,在洱源一带断裂拉张区形成断陷盆地,在红河断裂中南段一些拉张区也形成局部断陷湖盆,金沙江南流水系提供水源沉积了三营组.第四纪初期由于云岭山脉的隆起阻断了金沙江南去的水流,红河断裂带拉张区多数断陷湖盆干涸,结束了河湖相沉积.
The Sanying Formation is a set of river-lacustrine facies, distributed along the Honghe fault and its northwestern extension line, and is mainly exposed near Eryuan.The Triassic formation is intercalated with multi-layered grass coal and unconformity with the underlying Triassic limestone Contact with overlying Quaternary gravel and loose sediments.We quantified the deposition of the Sanying Formation by Pliocene Burial Age of the Cosmic Sinian in the Pliocene with the age of burial of cosmic genetic nuclides in the Quaternary gravel layer Sanying Formation End Time:> 2 Ma. From the spatial distribution and depositional time, the formation of the Sanying Formation is related to the Honghe fault and the Jianchuan fault. Due to the triggering of the Honghe fault and the Jianchuan fault at the end of the Miocene, The fault zone stretches along the fault zone to form a fault basin, and some fault-depression lacustrine basin also formed in some tension zone in the middle and southern section of the Honghe fault. The Sijingshan Formation is provided by the south stream system of the Jinshajiang River. At the beginning of Quaternary, due to the uplift of the Yunling Range Blocking the flow of water to the south of the Jinsha River. Most of the rift lakes in the pull-out zone of the Honghe Fault Zone dried up, ending the deposition of rivers and lakes.