华北晚古生代海平面变化研究

SEA-LEVEL CHANGES IN NORTH CHINA DURING THE LATE PALAEOZOIC

关键词:  层序地层  海平面变化  陆表海  华北板块

Key words:  sequence stratigraphy  sea-level change  epeiric sea  North China plate

摘要:

本文通过对华北板块沉积层序的研究,认为晚古生代沉积建造形成于一个二级海平面变化周期内,其中包括4个三级海平面变化旋回,分别发育于晚石炭世早期早时,晚石炭世早期晚时至晚石炭世晚期,早二叠世和中二叠早期至晚二叠世早期。每个三级海平面变化周期内又包含了若干个四级升降旋回。海平面变化具有全球性和等时性,本区的二级和三级海平面变化可与俄罗斯地台和北美地台等对比。

Abstract:

On the basis of the study of depositional sequences on the North China plate,the au-thors consider that the Late Palaeozoic depositional sequences in North China were formed in a second-ordre sea-level change cycle,which consists of four third-order sea-level change cycles developed during the early time of early Late Carboniferous,the late time of early Late Carboniferous to late Late Carboniferous,Early Permian and early Middle Permian to early Late Permian,respectively.Each third-order sea-level change cycle,in turn,comprises several fourth-order rise and fall cycles.The sea-level changes have the worldwide and syn-chronous features.The second-and third-order sea-level changes in the study area may be comparable with those on the Russian platform and North American platform.