Fig. 4: Spectral analysis by various 2 π multi-taper method (MTM) periodograms. | Nature Communications

Fig. 4: Spectral analysis by various 2 π multi-taper method (MTM) periodograms.

From: Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

Fig. 4

a Comparison of main Milankovitch periodicities for the La04 astronomical solution for the Recent (see ‘Methods’) and at 440 and 468 Ma for the obliquity and precession. b Periodogram for the non-detrended lithological rank time-series (depth domain). c Periodogram of the time-series tuned by frequency stabilization of the 17 kyr precession component (see Supplementary Fig. 10 for details on the frequency stabilization procedure). d Periodogram of the rank time-series tuned to precession cycles. e Periodogram of the Hilbert transform (Envelope) of the precession filter output extracted from the rank time-series tuned to 405 kyr cycles. f Periodogram of the metronomic FM time-series showing bundling at ratios of 1:5.4 and 1:4.6. g Periodogram of the rank time-series tuned to 405 kyr cycles.

Back to article page