LTD-Thellier paleointensity of 1.2 Ga Nova Floresta mafic rocks (Amazon craton)

Details LTD-Thellier paleointensity of 1.2 Ga Nova Floresta mafic rocks (Amazon craton) LTD-Thellier paleointensity of 1.2 Ga Nova Floresta mafic rocks (Amazon craton)

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3412306c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 12, CiteID L12306

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Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Geomagnetism And Paleomagnetism: Paleointensity, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Geomagnetism And Paleomagnetism: Instruments And Techniques

Scientific paper

Absolute paleointensity at 1.2 Ga was obtained on basalts and gabbros from Nova Floresta Formation (Amazon craton, Brazil). Magnetic carriers in these rocks are single-domain to multi-domain pure (to nearly pure) magnetite. They present a strong decrease in remanence after low-temperature demagnetization (LTD) accompanied by an increase in median destructive fields. Incorporation of LTD to Thellier double-heating measurements improved paleointensity estimates and enabled paleofield recovery for otherwise sterile rock samples, giving twenty seven successful determinations for six sites (45% success rate). Site-mean paleofield values are within 4.90 μT and 15.55 μT (mean at 8.37 +/- 4.07 μT). These results correspond to a mean VDM of 2.08 +/- 0.94 × 1022 Am2, thus increasing the number of low-field determinations that dominate the (still scarce) Precambrian database. Our study exemplifies the need for alternative approaches in the study of ancient rocks.

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