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Periodicity of Mesoscale Phanerozoic Sedimentary Cycles and the Role of Milankovitch Orbital Modulation

Data on more than 200 mesoscale sedimentary cycles indicate that Phanerozoic cycle periods are randomly distributed with respect to the four major Milankovitch orbital parameters, except Late Mississippian through Late Pennsylvanian cycles which show positive clustering about the 413,000 yr eccentricity period. Cycle periods, calculated from average thicknesses and accumulation rates, are strongly dependent on the former (correlation coefficient = 0.802), but relatively independent of the latter (correlation coefficient = -0.360). Hence, calculated period is largely a function of average cycle thickness, and Milankovitch-range periods will be preferentially calculated for cycles with average thicknesses between 1 m and 20 m, regardless of actual causes of cyclicity. For individual cyclic sequences, arguments for Milankovitch control based solely on average period are unfounded. Comparison of short-term Holocene sedimentation rates and long-term Phanerozoic accumulation rates for cyclic peritidal and deltaic facies suggests that average cycle deposition occurs in about 1/30 of the time represented by average cycle period. Thus, long, unconstrained intervals of non-deposition predominate in most cratonic and continent-margin cyclic sequences.