三塘湖盆地晚二叠世芦草沟组孢粉组合

LATE PERMIAN SPOROPOLLEN ASSEMBLAGE FROM LUCAOGOU FORMATION IN SANTANGHU BASIN

尹凤娟 刘洪福 华洪

Yin Fengjuan Liu Hongfu Hua Hong

三塘湖盆地芦草沟组为一套以灰色泥岩为主的浅湖半深湖相沉积。泥岩中产丰富的孢粉化石,计有 26属 28种。经研究表明,芦草沟组孢粉组合是以裸子植物花粉占绝对优势、蕨类植物孢子含量很低为特征。和等花粉在组合中占主导地位。根据孢粉组合特征及其对比,芦草沟组的地质时代属晚二叠世早期;孢粉颜色反映当时的古地温应为 60～110℃,有机质演化属低成熟阶段。

Lucaogou Formation in Santanghu basin consists of a set of shallow lacustrine-semi lacustrine deposits mainly in gray mudstone. Abundant spores and pollen grains including 28 species of 26 genera are recognized in the mudstone. It is indicated by studying that Lucaogou Formation sporopollen assemblage is characterized by the dominance of grains and a small amount of . and are dominant in the mudstone. It is believed that Lucaogou Formation belongs to the early late Permian in age based on its feature of sporopollen assemblage and comparison. colors may reflect then ancient temperature between 60℃～110℃ and evolution of organic material in low maturation stage.

10.11743/ogg20020419