Paleomagnetism and rock magnetism of Fernando de Noronha, Brazil

Details Paleomagnetism and rock magnetism of Fernando de Noronha, Brazil Paleomagnetism and rock magnetism of Fernando de Noronha, Brazil

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79..208s&link_type=abstract

Earth and Planetary Science Letters, Volume 79, Issue 1-2, p. 208-216.

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Seven sites from basaltic rocks of the Quixaba Formation (K/Ar age 3.4 +/- 1.7 m.y.) on Fernando de Noronha (3.85°S, 32.4°W) yield a pole at 80.3°N, 234°E with A95 = 2.9° and K = 446 after AF cleaning, and seven sites from the Remédios Formation (9.5 +/- 1.1 m.y.) yield a pole at 84.5°N, 136°E with A95 = 7.5° and K = 65. Combination of all published reliable data results in poles at 80.6°N, 216°E (N = 21, A95 = 3.2°, K = 100) and 86.0°N, 81°E (N = 17, A95 = 4.9°, K = 53) for the Quixaba and Remédios Formation, respectively (both with mixed polarity). The two pole positions differ significantly from each other. Seven sites from volcanics (K/Ar age 28.7 +/- 2.5 m.y.) in the province of Fortaleza (3.8°S, 38.7°W) yield a pole at 66°N, 54°E with A95 = 19.1° and K = 10.9. Rock magnetic investigations and chemical analyses on samples from Fernando de Noronha reveal as primary phase titanomagnetites with about 60% ulvöspinel in most cases. The titanomagnetites have undergone high-temperature oxidation and low-temperature oxidation of various degrees. The ferrimagnetic phases in the samples from the province of Fortaleza are magnetites with low-temperature alterations showing relative weak stability of remanence.

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