@article{Di:2017:10.1002/2017GC007175,
author = {Di, Chiara A and Muxworthy, AR and Trindade, RIF and Bispo-Santos, F},
doi = {10.1002/2017GC007175},
journal = {Geochemistry, Geophysics, Geosystems},
pages = {3891--3903},
title = {Paleoproterozoic Geomagnetic Field Strength From the Avanavero Mafic Sills, Amazonian Craton, Brazil},
url = {http://dx.doi.org/10.1002/2017GC007175},
volume = {18},
year = {2017}
}

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TY  - JOUR
AB  - A recent hypothesis has suggested that Earth's inner core nucleated during the Mesoproterozoic, as evidenced by a rapid increase in the paleointensity (ancient geomagnetic field intensity) record; however, paleointensity data during the Paleoproterozoic and Mesoproterozoic period are limited. To address this problem, we have determined paleointensity from samples from three Paleoproterozoic Avanavero mafic sills (Amazonian Craton, Brazil): Cotingo, 1782 Ma, Puiuà 1788, and Pedra Preta, 1795 Ma. We adopted a multi-protocol approach for paleointensity estimates combining Thellier-type IZZI and LTD-IZZI methods, and the non-heating Preisach protocol. We obtained an average VDM value of 1.3 ± 0.7 × 1022Am2 (Cotingo) of 2.0 ± 0.4 × 1022Am2 (Puiuà) and 6 ± 4 × 1022Am2 (Pedra Preta); it is argued that the Cotingo estimate is the most robust. Our results are the first data from the upper Paleoproterozoic for South America and are comparable to data available from other regions and similar periods. The new data do not invalidate the hypothesis of that Earth's inner core nucleated during the Mesoproterozoic.
AU  - Di,Chiara A
AU  - Muxworthy,AR
AU  - Trindade,RIF
AU  - Bispo-Santos,F
DO  - 10.1002/2017GC007175
EP  - 3903
PY  - 2017///
SN  - 1525-2027
SP  - 3891
TI  - Paleoproterozoic Geomagnetic Field Strength From the Avanavero Mafic Sills, Amazonian Craton, Brazil
T2  - Geochemistry, Geophysics, Geosystems
UR  - http://dx.doi.org/10.1002/2017GC007175
UR  - http://hdl.handle.net/10044/1/51928
VL  - 18
ER  - 

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