Geochronology of the American-Antarctic Ridge

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 2006 English Publisher:Pleiades Publishing LtdJournal:Oceanology, volume 46, pages 114-122 (issn: 0001-4370,

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Authors: Schreider, Anatoly; Schreider, Al. A.; Bulychev, A. A.; Galindo-Zaldívar, Jesús; Maldonado, Andrés; Kashintsev, G. L.;

doi: 10.1134/s0001437006010139

handle: 10261/18678

Geochronology of the American-Antarctic Ridge

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Abstract

A new map of chrons for the American-Antarctic Ridge area has been compiled. Its analysis and the calculations performed showed that the seafloor spreading with respect to its axis started before 85 My B.P. The spreading directions were 115° (chrons C34-C29), 145° (chrons C29-C21), 110° (chrons C21-C5C), and 85° (chrons C5C-C1). The maximum rates of about 4 cm/year were reached earlier than 52 My B.P.; subsequently, a progressive general decrease in the spreading rate has been observed. According to our forecast, the spreading may cease in the following 3.5 My.

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