Long-period Milankovitch cycles from the Late Triassic and Early Jurassic of eastern North America and their implications for the calibration of the Early Mesozoic time–scale and the long–term behaviour of the planets

Abstract

Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Olsen Paul E. and Kent Dennis V. 1999Long-period Milankovitch cycles from the Late Triassic and Early Jurassic of eastern North America and their implications for the calibration of the Early Mesozoic time–scale and the long–term behaviour of the planetsPhil. Trans. R. Soc. A.3571761–1786http://doi.org/10.1098/rsta.1999.0400SectionRestricted accessLong-period Milankovitch cycles from the Late Triassic and Early Jurassic of eastern North America and their implications for the calibration of the Early Mesozoic time–scale and the long–term behaviour of the planets Paul E. Olsen Paul E. Olsen Lamont-Doherty Earth Observatory of Columbia University, Rt 9W, Palisades, NY 10964, () Google Scholar Find this author on PubMed Search for more papers by this author and Dennis V. Kent Dennis V. Kent Lamont-Doherty Earth Observatory of Columbia University, Rt 9W, Palisades, NY 10964, () Google Scholar Find this author on PubMed Search for more papers by this author Paul E. Olsen Paul E. Olsen Lamont-Doherty Earth Observatory of Columbia University, Rt 9W, Palisades, NY 10964, () Google Scholar Find this author on PubMed Search for more papers by this author and Dennis V. Kent Dennis V. Kent Lamont-Doherty Earth Observatory of Columbia University, Rt 9W, Palisades, NY 10964, () Google Scholar Find this author on PubMed Search for more papers by this author Published:15 July 1999https://doi.org/10.1098/rsta.1999.0400AbstractDuring the Late Triassic and Early Jurassic the Newark rift basin of the northeastern US accumulated in excess 5 km of continental, mostly lacustrine strata that show a profound cyclicity previously interpreted as caused by the astronomical forcing of tropical climate. The Newark record is known virtually in its entirety as a result of scientific and other coring and provides what is arguably one of the longest records of climate cyclicity available. Two proxies of water depth and hence climate in this record are a classification of sedimentary structures (depth ranks) and sediment colour. The depth rank and colour depth series display a full range of climatic precession related cycles. Here, we tune the depth rank and colour records to the 404 ka astronomical cycle and use this tuned record to explore the existence and origin of very long–period climate. We find highly significant periods of climatic precession modulation at periods of ca.1.75 Ma, 1 Ma and 700 ka in not only the depth rank and colour records, but also in the sedimentation rate curve derived from the tuning process. We then use the colour and depth rank time–series to construct an astronomically tuned time–scale for the Late Triassic. While the Newark higher–frequency eccentricity cycles that modulate precession are indistinguishable from today, the 1.75 Ma cycle is significantly different from predictions based on the present day fundamental frequencies of the planets (i.e. 2.5 Ma) and provides the first geological evidence of the chaotic behaviour of the inner planets, otherwise known only from numerical calculations. Previous ArticleNext Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsCited by Falahatkhah O, Kordi M, Fatemi V and Koochi H (2021) Recognition of Milankovitch cycles during the Oligocene–Early Miocene in the Zagros Basin, SW Iran: Implications for paleoclimate and sequence stratigraphy, Sedimentary Geology, 10.1016/j.sedgeo.2021.105957, 421, (105957), Online publication date: 1-Jul-2021. Şengör A (2021) Continental Rifts Encyclopedia of Solid Earth Geophysics, 10.1007/978-3-030-58631-7_31, (64-78), . 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