东北地区晚石炭世岩相古地理研究

Lithofacies Palaeogeography of Late Carboniferous in Northeast China

利用野外地质剖面、关键钻井剖面和区域地质资料,在地层划分与对比、构造格局以及早石炭世研究的基础上,从点—线—面的沉积相分析入手,将晚石炭世的巴什基尔期—格舍尔期作为一个编图单元进行岩相古地理编图,恢复了东北地区晚石炭世的岩相古地理面貌。研究表明,东北地区晚石炭世主要发育浅海陆棚沉积体系、台地沉积体系、障壁海岸沉积体系、河流沉积体系及湖泊沉积体系;研究区存在漠河及佳木斯两个主要的古陆区,物源区碎屑物质供应丰富,其余地区以海相沉积为主,仅北侧黑河-松辽地区和东部饶河地区尚存河流相沉积区。在前人研究成果基础上,融合近年来东北地区地层精细划分和对比、构造演化的新认识,形成了一套更加精细的岩相古地理图。

On the basis of stratigraphie division,correlation,and the study of structural pattern, the field data of the measurement strata sections and the existing regional geological data were used to do the sedimentary facies analysis ranging from the sections to the whole study area. The lithofacies palaeogeographic map of Basbkirian-Gzbelian of Late Carboniferous was constructed in Northeast China. The study shows that the sedimentary systems include mainly neritic shelf sedimentary system, carbonate platform sedimentary system, barrier coast sedimentary system, river sedimentary system, lake sedimentary system developed during the Late Carboniferous in Northeast China; the old lands were Mohe and Jiamusi,which has provided rich source material. Other areas were primarily of marine sedi- ments, with exceptionally Heihe-Songliao region and the eastern Raohe region surviving in fluvial depositional area.