塔里木盆地泥盆系-石炭系界线研究新进展

New Advances in the Study of the Devonian-Carboniferous Boundary in the Tarim Basin

塔里木盆地巴楚组下泥岩段上部产早石炭世早期的 Cymbosporites spp.- Retusotriletes incohatus (SI)孢子组合 ,下部产晚泥盆世的 Auroraspora- Cymbosporites (AC)孢子组合 ,孢子研究表明泥盆系 -石炭系界线应从下泥岩段内部通过。

The strata closely related to the Devonian Carboniferous boundary in the Tarim Basin are the Donghetang, Ganmulike and Bachu (including Lower Mudstone and Bioclastic Limestone members) Formations in ascending order. The position of the Devonian Carboniferous boundary has been changed in the past decade due to poor palaeontological evidence obtained. The boundary used to be drawn at the bases of the Donghetang and Ganmulike Formations, the Lower Mudstone and Bioclastic Limestone members at different time. Based on the spores first obtained from the lower part of the Lower Mudstone Member in this paper that is believed to be of late Devonian age and the spores from the upper part of the Member which have been thought to be earliest Carboniferous in age by Zhu Huai cheng et al ., (1999), it is reasonable to draw the boundary between the lower and upper parts of the Lower Mudstone Member.