摘要
滇西施甸下泥盆统沙坝脚组和中泥盆统松林沟组、何元寨组具有典型斜坡相沉积特征,由三个主要沉积单元组成:a.由半远洋沉积含有光壳竹节石、笔石、菊石等浮游生物的薄层泥晶灰岩、泥灰岩、页岩组成;b.由碎屑流和变密度颗粒流形成的砾屑灰岩;c.在松林沟组中出现有滑塌层及变形构造。
The Shabajiao formation of Lower Devonian and Songlingou and Heyuanzhai formation of Middle Devonian in
Shidian district of West Yunnan are of typical slope facies. The deposits on slope are mainly composed of three major sed-
imentary units.
(1) Hemipelagic sediments consist of thin bedded micrite, marlite and shale with plankton such as styliolina, grapto-
lites and nautiloids.
(2) Calcirudites were originated by debris flow and density-modified grain flow.
(3) Slump and soft-sediment deformation occur in Songlingou formation.
关键词
泥盆世
斜坡相
沉积
slope facies
hemipelagic sediment
debris flow
density-modified grain flow
slump
