A method to decipher the time distribution in astronomically forced sedimentary couplets
作者： D. Ma , C. , Meyers , S.R. , Hinnov
DOI: 10.1016/J.MARPETGEO.2020.104399
关键词: Cenomanian 、 Geology 、 Precession 、 Marl 、 Time distribution 、 Sedimentary depositional environment 、 Paleontology 、 Sedimentary rock 、 Sedimentation 、 Paleoclimatology
摘要: Abstract Sedimentary couplets that are generated by astronomical forcing common in pelagic and hemipelagic depositional settings. This study disentangles the time scales (sedimentation rates) of two lithofacies contribute to such astronomically-forced couplets, introducing Alpha method. new method can be applied precession or obliquity-forced sedimentary records, compares frequency modulation an cycle model with thicknesses couplets. The is demonstrated on a synthetic index-forced succession limestone-marlstone Finally, methods case studies: for Middle Cenomanian Eagle Ford Formation (Iona-1 core, Texas), sedimentation rates estimated as 0.85–1.02 cm/kyr marlstone 4.70–5.65 cm/kyr limestone; Eocene IODP Expedition 342 Site U1408, 1.70–1.84 cm/kyr white nannofossil ooze 2.54–2.75 cm/kyr greenish nannofossil-rich clay. More generally, studies paleoclimate geochemical evolution at sub-Milankovitch scale benefit from this
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