浅议中国北方中生代陆相盆地中的高级别层序

简单回顾了中国陆相层序地层学的发展,指出有必要加强高级别层序的研究。被广泛采用的术语“构造层序”尽管高于3级层序,但与高级别层序的关系仍难确定。根据当前海相层序地层学的研究成果,讨论了将30～40Ma周期为时限的中层序用于陆相盆地层序地层分析的可能性和存在的问题。

A DISCUSSION ON HIGH-RANK DEPOSITIONAL SEQUENCES OF MESOZOIC CONTINENTAL BASINS IN NORTH CHINA

A brief review of the development of terrestrial sequence stratigraphy in China isgiven and the necessity of the research of the high-rank depositional sequences is emphasised.Despite the fact that the cornrnnly used term "tectonic sequence" is of the rank higher than thebasic sequence, but the relationship between the tectonic sequence and the high-rank depositional sequence is still uncertain. Based on the achievement of the sequence stratigraphy of marine strata, the possibility of the mesoapuence division (30-40 Ma) in terrestrial sequencestratigraPhy is discussed. Through the surnrnarization and analysis of the resu1ts achieved bydifferent authors, it is concluded that the Mesozoic strata in the continental basins of NorthChina can be divided into 5 mesosequences. Their lower beundaries from bottom to top are (1)the boundary between Permian and Triassic system; (2) the top of Norian; (3) the top or upper part of Baocian; (4) the middle of Tithonian and (5) the lower of Albin respectively.