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

Author

Listed:
  • 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
    Trinity College Dublin)

  • Beck E. Strauss

    (NIST)

  • Francisco W. Cruz

    (Universidade de São Paulo)

  • Hai Cheng

    (Xi’an Jiaotong University
    Key Laboratory of Karst Dynamics, MLR, Institute of Karst Geology, CAGS)

  • R. Lawrence Edwards

    (University of Minnesota)

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.

Suggested Citation

  • 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 C, 2022. "Stalagmite paleomagnetic record of a quiet mid-to-late Holocene field activity in central South America," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28972-8
    DOI: 10.1038/s41467-022-28972-8
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