Mathematics – Logic
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128..357m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, no. 3-4, p. 357-371
Mathematics
Logic
8
Brazil, Geochemistry, Geochronology, Paleomagnetism, Rocks, Thermomagnetic Effects, Magnetic Poles, Magnetite, Radiometers
Scientific paper
The Anari and Tapirapua formations are very similar from the point of view of paleomagnetic, geochronological and geochemical results. They date from around 197 Ma and the flows are mainly tholeiitic basalts with a low TiO2 and incompatible element content. The magnetic carriers in rocks from these two formations were highly oxidized titanomagnetites, maghemites and, probably, titanomaghemites. Paleomagnetic analysis has shown that the magnetizations are all normal in polarity and virtual geomagnetic poles obtained for both formations are indistinguishable at the 95% confidence level. The calculated mean for these poles is 250.3 deg E, 65.5 deg S (N = 15; A95 = 3.6 deg; KSC = 1578). This pole is compatible with Jurassic poles which have been determined for South America or transposed from Africa.
Bellieni Giuliano
Melfi Adolpho J.
Montes-Lauar C. R.
Pacca Igor I. G.
Petrini R.
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