A method to decipher the time distribution in astronomically forced sedimentary couplets
A method to decipher the time distribution in astronomically forced sedimentary couplets
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破译天文强迫沉积对中时间分布的方法
DOI:
10.1016/j.marpetgeo.2020.104399
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发表时间:
2020
影响因子:
4.2
通讯作者:
Minisini, Daniel
中科院分区:
文献类型:
--
作者:
Ma, Chao;Meyers, Stephen R.;Hinnov, Linda A.;Eldrett, James S.;Bergman, Steven C.;Minisini, Daniel
Sedimentary couplets that are generated by astronomical forcing are common in pelagic and hemipelagic depositional settings. This study disentangles the time scales (sedimentation rates) of the two lithofacies that contribute to such astronomically-forced couplets, by introducing the Alpha method. This new method can be applied to precession or obliquity-forced sedimentary records, and compares the frequency modulation of an astronomical cycle model with the thicknesses of the couplets. The method is demonstrated on a synthetic model of a precession index-forced succession of limestone-marlstone couplets. Finally, the methods is applied to two case studies: for the Middle Cenomanian Eagle Ford Formation (Iona-1 core, Texas), sedimentation rates are estimated as 0.85–1.02 cm/kyr for the marlstone and 4.70–5.65 cm/kyr for the limestone; for the Middle Eocene IODP Expedition 342 Site U1408, sedimentation rates are 1.70–1.84 cm/kyr for the white nannofossil ooze and 2.54–2.75 cm/kyr for the greenish nannofossil-rich clay. More generally, studies of paleoclimate and geochemical evolution at the sub-Milankovitch scale can benefit from this method.
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