华北板块北缘赤峰地区晚古生代地层特征

Later Paleozoic Stratigraphy in the Chifeng Area on the Northern Margin of the Huabei Plate

华北板块北缘晚古生代地层发育特征明显不同于华北板块本部。华北板块北缘发育的晚古生代地层总体上表现为海相、海陆过渡相、陆相的完整沉积序列;华北板块本部发育的晚古生代地层为一套海陆交互相,厚度较薄的稳定沉积序列。通过采集华北板块北缘石炭系朝吐沟组、二叠系清凤山组火山岩锆石U-Pb测年,前者为348.2±1.9Ma,为下石炭统;后者为255.5±2.5Ma,为上二叠统,两者锆石均具有岩浆成因。锆石测年确定了华北板块北缘晚古生代地层的地质年龄,为该地区地层的鉴定提供了可靠的依据。

Later Paleozoic stratigraphy on the northern margin of the Huabei plate is a set of sediments of stable marine continental alternation facies. Zircon U-Pb dating data for volcanic rock from the Carboniferous Chaotugou Formation and Permian Qingfengshan Formation are 348.2±1.9Ma and 255.5±2.5Ma, respectively which show Early Carboniferous and Late Permian, respectively.