新疆塔里木盆地塔中地区塔中822井上奥陶统的层孔虫化石及其造礁特征

UPPER ORDOVICIAN STROMATOPOROIDS AND REEF CHARACTERISTICS FROM WELL 822 IN THE TAZHONG AREA OF THE TARIM BASIN,XINJIANG,CHINA

塔里木盆地奥陶系的礁滩相地层产出非常丰富的古生物化石,本文研究了塔中地区塔中822井的上奥陶统地层的层孔虫化石,共发现层孔虫2目6属8种,包括一新种,主要有厚柱层孔虫(Pachyst ylostroma)、囊层孔虫(Cystistroma)、拉贝希层孔虫(Labechia)、罗森层孔虫(Rosenella)、蜂巢层孔虫(Ecclimadictyon)和网格层孔虫(Clathrodictyon)。这些不同属种的层孔虫分别呈层状、皮壳状或块状、球状产出,形成层孔虫绑结岩和骨架岩,是生物礁的主要造架生物。

Abundant Ordovician fossils are found from the reef-and beeche-beds in the Tarim Basin. This paper des- cribes the upper Ordovician stromatoporoids of Well 822 in the Tazhong area of the Tarim Basin. They include 9 spe- cies referred to 7 genera as Pachystylostroma, Cystistrorna, Labechia, Rosenella, Argostroma, Ecclimadictyon and Clathrodictyon. All these stromatoporoids show as stratiform, crusty, crumb or spheral shapes in the rocks. They formed bound stone and frame stone, and are the main organisms of the reef.