粤东北地区天子岭组碎屑岩特征及沉积环境分析

Abstract

天子岭组是粤北地区典型的一套碳酸盐岩，在粤北地区以灰岩为主，代表了局限台地相沉积，而向东至粤东北地区时天子岭组相变为以碎屑岩为主，局部夹灰岩透镜体，潮汐层理发育，代表了含陆源碎屑物质的滨海相–三角洲相沉积。天子岭组自西向东的岩性变化反应了晚泥盆世早期海侵不断扩大，至晚期时地壳开始抬升，整体上处于一个海退的过程。 Tianziling Formation is mainly a set of carbonate deposition in Northern Guangdong. With limes-tones dominating in Northern Guangdong, it reflects the limited carbonate platform sedimentary facies. While to the Northeastern Guangdong, the sedimentary facies of Tianziling formation changes to clastic rocks depositing, with tidal bedding and limestone lenses intercalated, representing marine to delta sedimentary facies with terrigenous clastics. The lithology change from west to east of Tianziling formation reflected that in early of Late Devonian, the scope of transgression increased, while in the late time, it was in a process of regression on the whole with crustal beginning to uplift.