Geochronology of the American-Antarctic Ridge |
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| Authors: | A A Schreider Al A Schreider A A Bulychev J Galindo-Zaldivar A Maldonado G L Kashintsev |
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| Institution: | (1) Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia;(2) Department of Geology, Moscow State University, Moscow, Russia;(3) University of Granada, Granada, Spain;(4) Institute for Mediterranean Geology, Granada, Spain |
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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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