摘要
凹槽流痕是在等深流作用下,在层面上产生的一种冲刷痕迹原生沉积构造,一般较为罕见,其长轴方向与等深流方向一致,沿大陆斜坡走向分布。赣北晚元古代早期程浪群计林组的紫红色条带状细粒碎屑沉积浅变质岩的层面上,有密集而清晰的凹槽流痕分布。
In the Zhanggongshan terrane of northern Jiangxi, dense and clear trough marks have been discovered on the surface of the Neoproterozoic slightly metamorphosed sedimentary rocks. The beds with trough marks are purple contourites. The macro-axis of the trough marks is oriented in an E-W direction, parallel to the strike of the paleocontinental slope, representing the flow direction of contour currents. In the turbidites of the same sequence of strata, the direction of turbidity currents is about 180°± , which is in line with the dip of the paleocontinental slope.The contour currents are belelieved to be ocean currents between the equator and the poles, controlled by Coriolis inertia force. They should flow in a N-S direction. In combination with the paleomagnetic data, it is suggested that this region probably drifted from south to north and rotated counterclockwise nearly 90°.
出处
《地质论评》
CAS
CSCD
北大核心
1995年第4期371-377,共7页
Geological Review
