Computer Science
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.187...39h&link_type=abstract
Earth and Planetary Science Letters, Volume 187, Issue 1-2, p. 39-53.
Computer Science
1
Scientific paper
The paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia was for many years considered to be the only primary pole for Australia in the interval 1050-700 Ma, and has been used to constrain reconstructions of the Neoproterozoic supercontinent Rodinia. We conducted a detailed paleomagnetic study of one of the YB dykes, resampling the same outcrops from which a positive baked contact test was reported previously. Our results yield a negative baked contact test, and, combined with petrographic and rock magnetic data, indicate that the YB dyke magnetisation is a secondary overprint. The YB dyke pole should no longer be used in testing Rodinia reconstructions. Comparison with the apparent polar wander path for Phanerozoic Australia suggests the YB magnetisation is Mesozoic in age, although rocks along the western margin of the Yilgarn Craton preserve Early Paleozoic Rb-Sr biotite ages.
Halls Henry C.
Wingate Michael T. D.
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