东北地区晚古生代海相地层属于大陆边缘沉积的确定

Confirmation of Late Paleozoic marine strata belonging to continental margin deposit in northeastern China

东北地区晚古生代海相地层围绕佳—蒙地块呈环带状分布。岩屑长石砂岩等非稳定型沉积发育,岩性横向变化较大,岩相不稳定,火山岩发育等说明其属于活动型沉积。从佳—蒙地块的核心到边缘缝合带可见有古陆—类陆表海—陆棚海—深海的较为明显岩相带变化。从环带状分布、活动型沉积和构造岩相带有规律分布等方面确定东北地区晚古生代海相地层属于佳—蒙地块的大陆边缘沉积。

The Late Paleozoic marine strata in northeastern China are distributed in zonal pattern and surrounding the Jiamusi—Mongolia block.The unsteady sedimentation such as well-developed lithic feldspar sandstone,transverse lithological variation,unstable lithofacies and development of volcanic rocks,indicated these strata belonging to active sediment.From the core to the marginal suture belt of the Jiamusi—Mongolia block,obvious lithofacies change of old land—para—epicontinental sea—continental shelf sea—abyssal sea can be seen.The authors suggested that the Late Paleozoic marine strata might belong to continental marginal deposits of Jiamusi—Mongolia block in northeastern China,based on the zonal distributions,active deposition,and regular distribution of the tectonic lithological zones.