Mathematics – Logic
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..600w&link_type=abstract
Nature (ISSN 0028-0836), vol. 320, April 17, 1986, p. 600-602.
Mathematics
Logic
25
Earth-Moon System, Lunar Rangefinding, Paleontology, Precambrian Period, Lunar Tides, Moon, Tides, Distance, Evolution, Earth-Moon System, Orbits, Cycles, Collisions, Periodicity, Geological Formations, Layers, Tidal Effects, Sediments, History, Friction, Calculations, Samples, Terrestrial
Scientific paper
The first direct determination of the lunar distance in the Precambrian is presented. A 23.3 + or - 0.3 yr periodicity preserved in 2500 Myr BP Australian banded iron formation is interpreted as reflecting the climatic influence of the lunar nodal tide, which has been detected with its modern 18.6-yr periodicity in some modern climate records. The lunar distance at 2500 Myr BP would then have been about 52 earth radii. The implied history of precambrian tidal friction is in accord with both the more recent paleontological evidence and the long-term stability of the lunar orbit. The length of the Milankovitch cycles that modulate the ice ages today also evolve with the earth-moon system. Their detection in the Precambrian sedimentary record would then permit an independent determination of the lunar distance.
Walker James C. G.
Zahnle Kevin J.
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