摘要
根据新发现的晚泥盆世标准化石,把塔里木盆地西南缘原归属于元古界、志留系—中泥盆统、上寒武统—中奥陶统的一套浅变质岩的原岩时代重新确定为晚泥盆世。浅变质岩的物质组成、空间分布和区域地质特征表明,其原岩在沉积之后不久就受到低温动力变质作用改造,动力变质作用与北昆仑造山带在志留纪—泥盆纪期间的碰撞造山作用相关。上泥盆统浅变质岩的确定为北昆仑碰撞造山作用提供了新的时代约束。
According to the index fossil of Late Devonian, the age of the epimetamorphic rocks on the southwestern margin of the Tarim Basin is interpreted as Late Devonian, contradictory to previous asser- tion that they are Proterozoic, Silurian--Middle Devonian, or Late Cambrian--Middle Ordovician in age. The lithological components, spatial distribution and regional geological features of these epimetamorphic rocks show that their protolith experienced low-temperature dynamic metamorphism soon after they were deposited. The metamorphism is related to the collisional orogeny of the North Kunlun Orogen during the Silurian-Devonain. The Upper Devonian epimetamorphic rocks provide new age constraint on the North Kunlun Collisional Orogeny.
出处
《地层学杂志》
CSCD
北大核心
2007年第4期391-394,共4页
Journal of Stratigraphy
关键词
浅变质岩
碰撞造山作用
晚泥盆世
北昆仑造山带
塔里木盆地
新疆
epimetamorphic rock, collisional orogeny, Late Devonian, North Kunlun Orogen, Tarim Ba-sin, Xinjiang
