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Geology; May 2003; v. 31; no. 5; p. 415-418; DOI: 10.1130/0091-7613(2003)031<0415:POTEGG>2.0.CO;2
© 2003 Geological Society of America
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Paleointensity of the early geodynamo (2.45 Ga) as recorded in Karelia: A single-crystal approach

A.V. Smirnov1, J.A. Tarduno1 and B.N. Pisakin2

1 Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA
2 Department of Earth Physics, Saint Petersburg State University, Saint Petersburg 199034, Russia

We report Thellier paleointensity results from single plagioclase crystals derived from ca. 2.45 Ga border dikes of the Burakovka layered intrusion (Karelia, Russia). Rock magnetic and transmission electron microscope analyses indicate that these plagioclase crystals contain pseudosingle- to single-domain magnetite inclusions. Fifteen determinations from four dikes meet reliability criteria and yield an average paleointensity of 43.2 ± 10.8 µT, which corresponds to a virtual dipole moment of 8.43 ± 2.11 x 1022 Am2. Although our result is unlikely to adequately represent the time-averaged field, the mean and range of values are similar to those of the present-day field. These values suggest that the inner core, which may stabilize the geodynamo, had started to grow by Early Proterozoic time.

Key Words: Precambrian • paleomagnetism • geodynamo • plagioclase feldspar • inner core




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