Holocene Geomagnetic Excursion at Mylodon Cave, Ultima Esperanza, Chile
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Paleomagnetic data from a section of a sedimentary sequence at Mylodon Cave (Seno de Ultima Esperanza, Chile) are reported. According to previous 14C data, the sediments have dates between 13, 500 and 5, 360 y.b.p. The section that is analyzed here is younger than 12, 000 y.b.p. Natural Remanent Magnetization (NRM) was measured from 39 successive cores, and stability of the NRM was analyzed by thermal demagnetization. Only five samples were rejected because they did not carry a characteristic remanent magnetization. Analysis of the rest of samples shows that the upper part of the section (younger than 10, 000 y.b.p.) recorded directions far removed from the present magnetic field, probably corresponding to a field excursion. Two areas where transitional VGP are concentrated were noticed: one in Africa and the other near Australia.
- Earth, Planets and Space
Earth, Planets and Space 47(12), 1325-1332, 1995-12-01
Society of Geomagnetism and Earth, Planetary and Space Sciences