Time-calibrated Milankovitch cycles for the late Permian
Citations Over TimeTop 10% of 2013 papers
Abstract
An important innovation in the geosciences is the astronomical time scale. The astronomical time scale is based on the Milankovitch-forced stratigraphy that has been calibrated to astronomical models of paleoclimate forcing; it is defined for much of Cenozoic-Mesozoic. For the Palaeozoic era, however, astronomical forcing has not been widely explored because of lack of high-precision geochronology or astronomical modelling. Here we report Milankovitch cycles from late Permian (Lopingian) strata at Meishan and Shangsi, South China, time calibrated by recent high-precision U-Pb dating. The evidence extends empirical knowledge of Earth's astronomical parameters before 250 million years ago. Observed obliquity and precession terms support a 22-h length-of-day. The reconstructed astronomical time scale indicates a 7.793-million year duration for the Lopingian epoch, when strong 405-kyr cycles constrain astronomical modelling. This is the first significant advance in defining the Palaeozoic astronomical time scale, anchored to absolute time, bridging the Palaeozoic-Mesozoic transition.
Related Papers
- → Milankovitch, the father of paleoclimate modeling(2021)29 cited
- → Orbital Influences on Conditions Favorable for Glacial Inception(2021)8 cited
- Analysis of milankovitch cycles of quaternary in sanhu area,eastern qaidam basin(2007)
- → Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous Greenhouse world(2013)1 cited
- → Milankovitch cycles in Banded Iron Formations(2022)