Mesozoic long-term eustatic cycles and their uncertain hierarchy

作     者：Dmitry A.Ruban 

作者机构：Department of Tourism Higher School of Business Southern Federal University International Agency for Minerals Policy ("MinPol") 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2015年第6卷第4期

页      面：503-511页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

主　　题：Global sea leve Eustatic cycle Triassic Jurassic Cretaceous 

摘      要：Global sea-level has changed in a cyclic manner through geologic history, but the regularities of these changes are yet to be fully understood. Despite certain （and sometimes significant） differences, the available Mesozoic eustatic curves permit the outlining of long-term eustatic cycles, which are provi- sionally defined as cycles recognizable at the stage level and higher. Interpretation of the Triassic eustatic curves indicates two orders of long-term cycles and a lst-order sea-level rise throughout the entire period. The Jurassic eustatic curves imply cyclicity of one or two orders, and a 1st-order eustatic rise during the entire period is also evident. Most challenges are interpretations for the Cretaceous; two to four orders of long-term eustatic cycles can be established for this period. Generally, the hierarchy of the long-term eustatic cycles might have changed through the Mesozoic. If so, and if one considers differences of cycles of the same order between the periods of this era, it is difficult to apply ＂standard＂ hierarchical classifications to the documented cycles. The hypothetical uncertainty of the hierarchy of the Mesozoic long-term eustatic cycles is an imoortant challenge for modern researchers.