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义敦地区处于活动岛弧带 ,1:5万区调将原图姆沟组自下而上分解为党恩组、列衣组、曲嘎寺组和勉戈组。以曲嘎寺组底部的I型不整合面及勉戈组底部的II型不整合面为基准 ,结合内部沉积组合特征 ,尝试划分出 3套三级层序地层 ,即下部层序 (未见底 )、中部I型碳酸盐层序和上部II型层序 (包括喇嘛垭组 ) ,在这些层序内各体系域发育齐全 ,特征明显。
The area of Yidun is in the active arc zone. The 1: 50000 zone divides the original Tumu groove into the party group, the group of Liunas, the Quagsi group and the Miange group from the bottom up. Based on the type I unconformity at the bottom of Quqasi Formation and the type II unconformity at the bottom of Migeo Formation, three sets of three-level sequence stratigraphy, ie, the lower sequence Bottom), central I-carbonate sequence and upper II-type sequence (including Lamaya Formation). In these sequences, each system tract is well-developed and distinctly characterized.