Physics – Geophysics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3401702w&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 1, CiteID L01702
Physics
Geophysics
Marine Geology And Geophysics: Marine Seismics (0935, 7294), Paleoceanography: Milankovitch Theory, Oceanography: General: Upwelling And Convergences (4964), Geochronology: Sedimentary Geochronology
Scientific paper
A well-pronounced succession of continuous high-amplitude reflectors characterises the upper acoustic units off Southwest Africa as revealed in our seismostratigraphic study. We performed spectral analyses over age-transformed seismic traces. The results suggest a temporal regularity in the variation of reflector strength according to Milankovitch cycles since the early Pliocene. Periods of 100 kyr/cycle between 0-2 Ma correspond to eccentricity modulations. From 2-3 Ma, shorter periods close to obliquity cycles prevail, whereas in even older units periodicity increases again to 100 kyr/cycle. We propose the cyclicity of high-amplitude reflectors is caused by orbitally driven climate variations, which modulate the sedimentary properties and with it the seismic reflectivity.
Uenzelmann-Neben Gabriele
Weigelt Estella
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