Ivory Coast microtektite strewn field - Description and relation to the Jaramillo geomagnetic event

Details Ivory Coast microtektite strewn field - Description and relation to the Jaramillo geomagnetic event Ivory Coast microtektite strewn field - Description and relation to the Jaramillo geomagnetic event

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..182g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 1, Oct. 1991, p. 182-196.

Physics

24

Geomagnetism, Remanence, Stratigraphy, Tektites, Ivory Coast, Ocean Bottom, Sediments

Scientific paper

The Ivory Coast microtektite strewn field is described, with emphasis on its relation to the Jaramillo geomagnetic event. The strewn field appears to be restricted to between 9 deg N and 12 deg S latitude. There is a general increase in the concentration of microtektites toward the Bosumtwi crater. The relationship between the onset of the Jaramillo subchron and the Ivory Coast microtektite layer is investigated in six cores. A plot of the difference in depth between the base of the Jaramillo subchron and the microtektite layer versus sediment accumulation rate is used to determine the average postdepositional remanent magnetization (PDRM) acquisition depth and the age difference between the onset of the Jaramillo subchron and the deposition of the microtektites. It is found that the average PDRM acquisition depth is 7 cm and that the microtektites were deposited approximately 8 ky after the onset of the Jaramillo subchron, indicating that the impact responsible for the Ivory Coast tektites and microtektites could not be casually related to the geomagnetic reversal at the base of the Jaramillo subchron.

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