Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit
- 1 February 2000
- journal article
- review article
- Published by American Geophysical Union (AGU) in Reviews of Geophysics
- Vol. 38 (1) , 37-59
- https://doi.org/10.1029/1999rg900016
Abstract
Over the past decade the analysis of sedimentary cyclic rhythmites of tidal origin, i.e., stacked thin beds or laminae usually of sandstone, siltstone, and mudstone that display periodic variations in thickness reflecting a strong tidal influence on sedimentation, has provided information on Earth's paleorotation and the evolving lunar orbit for Precambrian time (before 540 Ma). Depositional environments of tidal rhythmites range from estuarine to tidal delta, with a wave‐protected, distal ebb tidal delta setting being particularly favorable for the deposition and preservation of long, detailed rhythmite records. The potential sediment load of nearshore tidal currents and the effectiveness of the tide as an agent of sediment entrainment and deposition are related directly to tidal range (or maximum tidal height) and consequent current speed. Hence the thickness of successive laminae deposited by tidal currents can be a proxy tidal record, with paleotidal and paleorotational values being determined by analysis of measured records of lamina and cycle thickness. The validity of the findings can be investigated by testing the primary, observed values for internal self‐consistency through application of the laws of celestial mechanics. Paleotidal and paleorotational values provided by late Neoproterozoic (∼620 Ma) tidal rhythmites in South Australia are validated by these tests and indicate 13.1±0.1 synodic (lunar) months/yr, 400±7 solar days/yr, a length of day of 21.9±0.4 h, and a relative Earth‐Moon distance a/a0 of 0.965±0.005. The mean rate of lunar recession since that time is 2.17±0.31 cm/yr, which is little more than half the present rate of lunar recession of 3.82±0.07 cm/yr obtained by lunar laser ranging. The late Neoproterozoic data militate against significant overall change in Earth's moment of inertia and radius at least since 620 Ma. Cyclicity displayed by Paleoproterozoic (2450 Ma) banded iron formation in Western Australia may record tidal influences on the discharge and/or dispersal of submarine hydrothermal plumes and suggests 14.5±0.5 synodic months/yr and a/a0 = 0.906±0.029. The combined rhythmite data give a mean rate of lunar recession of 1.24±0.71 cm/yr during most of the Proterozoic (2450–620 Ma), suggesting that a close approach of the Moon did not occur during earlier time. Concentrated study of Precambrian tidal rhythmites promises to illuminate the evolving dynamics of the early Earth‐Moon system and may permit the lunar orbit to be traced back to near the time of the Moon's origin.This publication has 70 references indexed in Scilit:
- Evidence of deposition from individual tides and of tidal cycles from the Francis Creek Shale (host rock to the Mazon Creek Biota), Westphalian D (Pennsylvanian), northeastern IllinoisPublished by Elsevier ,2003
- Late Neoproterozoic periglacial aeolian sand sheet, Stuart Shelf, South Australia*Australian Journal of Earth Sciences, 1998
- Precambrian tidal and glacial clastic deposits: implications for Precambrian Earth–Moon dynamics and palaeoclimateSedimentary Geology, 1998
- The 18.6 yr nodal cycle and its impact on tidal sedimentationSedimentary Geology, 1993
- Laterally and vertically accreted tidal deposits in the Upper Proterozoic Madina—Kouta Basin, southeastern Senegal, West AfricaSedimentary Geology, 1993
- Neap-spring cycles in a subrecent tidal channel fill (3665 BP) at Schoorldam, NW NetherlandsSedimentary Geology, 1991
- Ebb-tidal jets: A model of suspended sediment and mass transport at tidal inletsEstuarine, Coastal and Shelf Science, 1986
- Tidal friction in the Earth-Moon systemPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1984
- Palaeontological data on the history of the earth-moon systemPhysics of the Earth and Planetary Interiors, 1979
- Nodal Tidal Cycle of 18.6 Yr.: Its Importance in Sea-Level Curves of the East Coast of the United States and Its Value in Explaining Long-Term Sea-Level ChangesGeology, 1973