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The Gilbert/Gauss sedimentary geomagnetic reversal record from southern Sicily
Author(s) -
van Hoof A. A. M.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00563
Subject(s) - geology , paleomagnetism , geomagnetic reversal , remanence , earth's magnetic field , polar wander , geophysics , sedimentary rock , paleontology , geomagnetic pole , marl , magnetization , physics , quantum mechanics , structural basin , magnetic field
A detailed paleomagnetic record of the Gilbert/Gauss reversal boundary in deep sea marls from southern Sicily shows that the remanence characterising the reversal is carried by a high‐temperature magnetite component. A low‐temperature component is intermediate between the high temperature component and a present‐day overprint, suggesting that it is obscured by weathering. The actual reversal record is clearly affected by filtering caused by early diagenetic acquisition of a chemical remanent magnetisation (CRM). Intermediate VGPs show a general confinement to a longitude over the Americas. More specifically, they are restricted to two clusters, a less distinct one off SE South America, and a very prominent one near NE North America The remarkable coincidence with two ‘Hoffmann clusters’ [Hoffmann, 1992] suggests that even a CRM acquisition filter cannot entirely obscure long‐lived transitional features.