The assumed Aalenian stage-long eustatic lowstand did not exist: A review of the fresh evidence from Africa and other continents
Abstract The views of the Jurassic eustatic fluctuations differ significantly: specialists either suggest multiple rises and falls ("Haq's view") or question the idea of global falls ("Hallam's view"). For instance, it is unclear whether there was a stage-long eustatic lowstand in the Aalenian. The presence of the noted alternatives is a serious problem complicating interpretation of events in the geological history. This paper summarizes the evidence of the Aalenian long-term shoreline shifts obtained in different regions of the world since 2000, i.e., after the noted views appeared. This evidence deals with the stratigraphical architecture of regions (interpreted in the present article), the established shoreline shifts (transgressions and regressions), and the knowledge of the regional tectonic activity. The compiled information characterizes "stable" regions located in the different parts of the world (Europe, Asia, Africa, North America, South America, and Australia). It is established that there were no regressions in some of these regions in the Aalenian, whereas regressions in the other regions can be explained by the influence of the tectonic activity. There was no coherence of the basin-scale eustatically-driven regressions (in contrast, the long-term Bajocian eustatic rise is proven by a coherence of regional transgressions). This finding contradicts the idea of the stage-long eustatic lowstand in the Aalenian and, thus, favours the "Hallam's view". This interpretation is in agreement with the present knowledge of the Earth's palaeoclimate and the past plate tectonics. This study demonstrates efficacy of interregional correlation of sea-level changes for resolution of the problem of the alternative views of the Jurassic eustasy. Highlights Alternative views of Jurassic eustasy are discussed: rises and falls or only rises. The assumed Aalenian global stage-long sea-level lowstand is questioned. A compilation of "fresh" evidence from "stable" continental regions. No support is found for the idea of the Aalenian stage-long sea-level lowstand. Climate and tectonics were unfavourable for the Aalenian stage-long sea-level lowstand.
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- DOI : http://dx.doi.org/10.1016/j.jafrearsci.2017.12.022
- Elsevier : 저널 > 논문
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