摘要
修定后的勉戈组含义为一套亚碱性钙碱系列、碱性钾质系列的中—酸性火山岩为主夹板岩的地层 ,属古义敦岛弧期的火山建造 ,其底界为一层序界面 ,下伏为洋岛—不成熟岛弧期的曲嘎寺组或根隆组。将勉戈组顶部一段富含化石的泥质岩、碳酸盐岩地层划出 ,称绿参段。勉戈组上覆为浊流相的喇嘛垭组。
The revised Miange Formation is interpreted as intermediate acidic volcanics of subalkline calc alkaline, potassium alkaline series, with intercalations of slates. This sequence is part of the Yidun paleo island arc, lying on a sequence boundary, which is underlain by the Qugasi or Genlong Formation of an island stage to an immature island arc stage. A fossil rich, argillaceous and carbonate member at the top of the Miange Formation is assigned as Lucan Member. The Miange Formation is overlain by the turbidite facies Lamaya Formation.
出处
《中国区域地质》
CSCD
2000年第2期187-191,共5页
Regional Geology of China
关键词
岩石地层
勉弋组
绿参段
四川
地层
lithostratigraphy
Miange Formation
Lucan Member
Sichuan
