楚雄盆地东部晚三叠世沉积环境

Sedimentary environments of the eastern part of the Chuxiong Basin in Yunnan during the Late Triassic

关键词:  楚雄盆地  晚三叠世  沉积环境  云南

Key words:  Chuxiong Basin  Late Triassic  sedimentary environment  Yunnan

摘要:

本文着重从野外剖面典型沉积相以及室内资料分析出发,通过对楚雄盆地东部晚三叠世古地貌、岩相、古生物、粒度以及微量元素等方面的分析,探讨盆地东部晚三叠世的沉积环境,认为晚三叠世的沉积环境从海相演变为过渡相和陆相。

Abstract:

The Chuxiong Basin in central Yunnan is a Mesozoic peripheral foreland basin. The basin was (developed) mainly during the Late Triassic, and may be considered as one of highly prospective areas for oil and gas exploration in southern China. The integration of the data on palaeomorphology, sedimentary facies, palaeontology, grain sizes and trace elements has disclosed that the eastern part of the Chuxiong Basin was once in a (restricted) marginal sea environment during the Carnian and early Norian (i.e. Pujiacunian); a delta (environment) during the late Norian i.e. Ganhaizian) and Rhetian (i.e. Shezian), and a nonmarine environment closely (associated) with seas during the Jurassic, which may be supported by the evidences from several phases of (transgressions) during the Middle and Late Jurassic.