A paleomagnetic and geochemical record of the upper Cochiti reversal and two subsequent precessional cycles from Southern Sicily (Italy)

Details A paleomagnetic and geochemical record of the upper Cochiti reversal and two subsequent precessional cycles from Southern Sicily (Italy) A paleomagnetic and geochemical record of the upper Cochiti reversal and two subsequent precessional cycles from Southern Sicily (Italy)

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.117..235v&link_type=abstract

Earth and Planetary Science Letters, Volume 117, Issue 1-2, p. 235-250.

Mathematics

Logic

10

Scientific paper

A detailed paleomagnetic and geochemical study of the upper Cochiti (N-R) reversal recorded in marine marls on southern Sicily shows two consecutive and very rapid transitions (R-N and N-R) that coincide with distinct lithological boundaries. A `Fe-migration model' is presented in which magnetite is formed under different diagenetic conditions. During sulphate reduction, originally formed (`primary') magnetite is preserved. This primary magnetite has recorded the pre-transitional normal polarity. After burial, migration of ferrous iron occurs and subsequent oxidation produces `secondary magnetite', which records the post-transitional reversed polarity and produces the two apparent transitions. In addition, low temperature (LT) and high temperature (HT) components record the reversal in a slightly different way: the HT component being acquired with a delay. It is probable that both components reside in magnetite but have a different origin and grain size distribution, giving different blocking temperature spectra. The actual upper Cochiti reversal occurs at a level with an estimated astronomically calibrated age of 4.165 Ma.

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