A SOUTHERN HEMISPHERE RECORD OF TIIE MATUYAMA-BRUNHES POLARITY REVERSAL
Abstract. We present a record of the Matuyama-Brunhes (0.73 Ma) polarity transition from a southern hemisphere deepsea sediment core (V16-58; 46"S, 30"E). The transition is recorded across at least 30 em of section and is defined by a nearly 180° change in directions which occurs during a...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1069.6730 http://www.rci.rutgers.edu/%7Edvk/dvk_REPRINTS/Clement%2BKent1991.pdf |
| Summary: | Abstract. We present a record of the Matuyama-Brunhes (0.73 Ma) polarity transition from a southern hemisphere deepsea sediment core (V16-58; 46"S, 30"E). The transition is recorded across at least 30 em of section and is defined by a nearly 180° change in directions which occurs during a low in the relative intensities. An increase in the 10Be/9Be ratios associated with the intensity low suggests that the relative intensities may document a decrease in the strength of the geomagnetic field. The virtual geomagnetic pole (VGP) path is neither clearly near-or far-sided, but tracks approximately 120° west of the site longitude. Considered with other MatuyamaBrunhes transition records, this southern hemisphere record supports previous interpretations that the Matuyama-Brunhes transitional field was not dipolar. Instead, the V16-58 transition together with other records of this reversal recently obtained from this longitudinal sector suggests that nonzonal terms which are symmetric about the equator were important during this transitional field. |
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