塔里木盆地北部井下下石炭统有孔虫及地层对比

LOWER CARBONIFEROUS FORAMINIFERA AND STRATIGRAPHIC CORRELATION IN DRILL, OF THE NORTHERN PART OF TARIM BASIN, XINJIANG

李汉敏

Li Hanmin

地矿部西北石油地质局地质大队 乌鲁木齐830011

Geological Division, Northwest Bureau of Petroleum Geology

塔里木盆地北部井下下石炭统自上而下分为3个组:央拜希组、卡拉沙依组和巴楚组。前两个组产有丰富的和有孔虫化石。科化石有4属18种,为一个带-Eostaffella带。有孔虫共计25属近60种,分成两个化石组合,即:2.Endothyranopsis cassus-Archaediscus krestovnikovi;1.Endothyra inflata f.minima-Archaesphaera minima.其中各有1新种。带和有孔虫组合2时代为中晚维宪期一早纳缪尔期。有孔虫组合1时代为中杜内期。

The Lower Carboniferous in drills of the northern part of Tarim Basin can be divided into three forastions from top to bottom: Yangbaxi, Kalashayi an Bachu. Abunbant foraminiferal and fusulinid fossils occur in Yangbaxi and Kalashayi formation. Fusulinid fossit amounting up to 4 genera and 18species belongs' to Eostaffella zone. Foraminferal fossil containins up to 25 genera and near 60 species could be categorizedas two assemblages: 2. Endothyranopsis cassus——Archaediscus krestovnikovi; and 1. Endothyra inflataf minima——Archaesphaera minima. The geological age of both fusulinid zone and 2 foraminiferal assemblage is from middle-late Visena to early namuran, and that of 1 foraminiferal assemblage is middle Tournaisian.

https://doi.org/10.11781/sysydz199601042