西藏措勤曲洛地区新发现侏罗纪地层

New discovery of Jurassic strata at Quluo Township,Cuoqin County,Tibet,China

在西藏措勤县曲洛乡门缸错地区发现了侏罗纪地层,详细描述了实测的侏罗系剖面,将该套地层暂时命名为曲洛组。讨论了该组的岩石组合特征和沉积环境,认为主要为一套海陆过渡三角洲—滨岸泻湖相沉积。根据曲洛组中的双壳化石、古植物及孢粉组合特征将这套地层的时代确定为早侏罗世。措勤地区下侏罗统的发现为区域地质构造演化研究和矿产资源勘查提供了新资料。

Jurassic stratigraphy is newly discovered near Mengang Cuo at Quluo Township,Cuoqin County,Tibet.The measured Jurassic section is described in details in this paper.It is temporary named as Quluo Formation.Lithological association and sedmentary environment of Quluo Formation have been discussed .The sedimentary environment are mainly composed of trasitional delta facies to coastal region lagoon.The time age of Quluo Formation is believed to be Early Jurassic according to bivalve fossils,plant fossils and sore-pollen association.The discover of Lower Jurassic in Cuoqin area will provide new data on area tectonic evolution and exploration of mineral resources.