青海南部结扎群上部含煤碎屑岩组孢粉组合

THE SPOROPOLLEN ASSEMBLAGE FROM THE UPPER COALY CLASTIC FORMATION OF THE JIEZHA GROUP IN SOUTHERN QINGHAI

本文首次对青海南部结扎群上部含煤碎屑岩组孢粉组合进行了研究。共发现孢粉和疑源类50属59种,其中包括3个新种。组合特征孢子为70％,花粉为28％疑源类为2％。孢子中主要为l Dictyophyllidites 17.3％,Concavlspovites 8.2％,Steveispovites 3.1％,Punctatisporites 3.8％,Undulialsporites 2.6％,Gleichiniidites 2.1％,Lopkotriletes 4.1％,Apictlatisporis3.1％,Neoraistrickia 3.0％,Convolutlspora 2.1％, Kyrtomisporls 4.4％等。花粉主要为:Cycadopites 11.3％,Pinites 3.4％,Piceapollenites 2.7％,Taeniaesporites 1.9％,Ovalipolli等。疑源类有:Sckizosporis 0.9％,Micrkystridium 0.6％等。地质时代为晚三叠世诺利晚期至瑞替期。

The sporopollen assemblage described in this paper was collected from the Upper Coaly Clastic Formation of the Jiezha Group. This Formation may be divided into two parts. The lower part is composed of grey to dark grey feldspthic quartz sandstone and siltstone, which yields bivalve fossils but no spores or pollen. The upper part consists of greyish-black slate, shale and coal beds or seams, sometimes intercalated with limestone or marl lenses, having a total thickness of 1500—4977m. The assemblage contains 70% spores, 28% pollen and 2% acritarchs, including Dictyophyllidites, Concavisporites, Punctatisporites, Lophotriletes, Apiculatisporis, Kyrtomisporis, Monosulcites and so on. They may be assigned to 50 genera and 59 species, of which 3 species are new. This formation also yields fossil plants such as Taeniopteris cf. stenophylla, Clathorpteris meniscioides, Dictyophyllum (D.) nathorsti, Anomozamites sp., Otozamites sp. The age of this spore-pollen assemblage is late Norian to Rhaetian.