Mathematics – Logic
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..349r&link_type=abstract
Earth and Planetary Science Letters, Volume 101, Issue 2-4, p. 349-366.
Mathematics
Logic
13
Scientific paper
Paleomagnetic poles from 1.1-1.0 Ga dyke swarms in eastern Brazil (Sa~o Francisco Craton) are compared with 1.0 Ga poles from granulites of the Namaqua Province in southern Africa (Kalahari Graton). The intrusive ages of dykes are estimated from 40Ar/39Ar dating of outgassed biotites from baked country rocks. The age of magnetization for the granulites is derived by combining 40Ar/39Ar hornblende and biotite dates. When restored to a Mesozoic pre-drift configuration the paleomagnetic poles are in crude spatial agreement but are temporally discordant. To satisfy both paleomagnetic and geochronologic constraints, a reconstruction involving separation of the Sa~o Francisco and Kalahari cratons is required, indicating that the intervening Pan-African (Brasiliano) mobile belt may record a craton-craton collision.
D'Agrella-Filho Manoel S.
Onstott Tullis C.
Pacca Igor I. G.
Renne Paul R.
Teixeira Wilson
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