摘要
青海南部雀莫错地区中-上侏罗统含有丰富的双壳类化石,自上而下划分为雀莫错组、布曲组、夏里组、索瓦组和雪山组等五个岩石地层单元。根据双壳类及共生的菊石化石提出除雪山组上部可能包括部分牛津期外,其余各组属于中侏罗世巴柔期至卡洛夫期。指出沉积盆地的深大断裂构造可能是导致该地区中侏罗统厚度大,达(3200—6300)m,厚度横向变化大的主要原因。推测当时存在(20-50)m和150m左右两种不同水深。
The Jurassic rocks occurred very abundant bivalves in Quemocuo area, Qinghai Province may be subdivided into five formations, in descending order as the Quemocuo Formation, Buqu Formation, Xiall Formation, Suowa Formation, and Xueshan Formation. They are referred into the Bajocina-Callovian of Middle Jurassic, except for the upper part, which might be the Oxydian. The deep rupture may be the main factor, which caused the heavy-thickness (3200 m—6300 m)and the great lateral change of that rocks. It is inferred that the water depth might be (20—50)m and 150 m respectively at that time.
出处
《科学技术与工程》
2004年第7期546-550,共5页
Science Technology and Engineering
基金
国家自然科学基金(40372004)
关键词
青海
侏罗系
双壳类
沉积环境
Qinghai Province
the Jurassic rocks
bivalves
depositionat environments
