Stalagmite paleomagnetic record of a quiet mid-to-late Holocene field activity in central South America

Plinio Jaqueto (), Ricardo I. F. Trindade, Filipe Terra-Nova, Joshua M. Feinberg, Valdir F. Novello, Nicolás M. Stríkis, Peter Schroedl, Vitor Azevedo, Beck E. Strauss, Francisco W. Cruz, Hai Cheng and R. Lawrence Edwards
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Plinio Jaqueto: Universidade de São Paulo
Ricardo I. F. Trindade: Universidade de São Paulo
Filipe Terra-Nova: Universidade de São Paulo
Joshua M. Feinberg: University of Minnesota
Valdir F. Novello: University of Tübingen
Nicolás M. Stríkis: Universidade Federal Fluminense
Peter Schroedl: University of Minnesota
Vitor Azevedo: Universidade Federal Fluminense
Beck E. Strauss: NIST
Francisco W. Cruz: Universidade de São Paulo
Hai Cheng: Xi’an Jiaotong University
R. Lawrence Edwards: University of Minnesota

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Speleothems can provide high-quality continuous records of the direction and relative paleointensity of the geomagnetic field, combining high precision dating (with U-Th method) and rapid lock-in of their detrital magnetic particles during calcite precipitation. Paleomagnetic results for a mid-to-late Holocene stalagmite from Dona Benedita Cave in central Brazil encompass ~1900 years (3410 BP to 5310 BP, constrained by 12 U-Th ages) of paleomagnetic record from 58 samples (resolution of ~33 years). This dataset reveals angular variations of less than 0.06° yr−1 and a relatively steady paleointensity record (after calibration with geomagnetic field model) contrasting with the fast variations observed in younger speleothems from the same region under influence of the South Atlantic Anomaly. These results point to a quiescent period of the geomagnetic field during the mid-to-late Holocene in the area now comprised by the South Atlantic Anomaly, suggesting an intermittent or an absent behavior at the multi-millennial timescale.

Date: 2022
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DOI: 10.1038/s41467-022-28972-8

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