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 R Schroedl, Vitor Azevedo, Beck E. Strauss, Francisco W. Cruz, Hai Cheng, R. Lawrence Edwards

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number1349
JournalNature communications
Volume13
Issue number1
DOIs
StatePublished - Dec 2022

Bibliographical note

Funding Information:
We are thankfull to Centro Nacional de Pesquisa e Conservação de Cavernas (CECAV/ICMBio) for providing permission to collect stalagmite samples. We are grateful to Augusto Auler and Bruna M. Cordeiro for guiding the first field trip to collect speleothems in Dona Benedita Cave. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. This work was supported by the São Paulo Research Foundation (Grants #2016/24870-2, #2016/15807-5, #2017/50085-3, #2018/15774-5, #2018/07410–3 and #2019/06709-8) the Serrapilheira Institute (grant number: Serra-1812-27990) and the National Council for Scientific and Technological Development (CNPq) (Grant numbers: 308769/2018-0 to N.M.S and 426258/2016-9 to ITP). This work was supported by National Natural Science Foundation of China, NSFC 41888101 to HC. This work was also supported by the National Science Foundation grant EAR-2044535 and US-Israel Binational Science Foundation grant #2016402 to JMF. The IRM is a US National Multi-user Facility supported through the Instrumentation and Facilities Program of the National Science Foundation, Earth Sciences Division, and by funding from the University of Minnesota. This work has been partially performed at USPMag laboratory at Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG) from Universidade de São Paulo (USP) funded by CAPES/FAPESP/CNPQ. Certain commercial equipment, instruments, materials, and software are identified in this paper to foster understanding. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.

Funding Information:
We are thankfull to Centro Nacional de Pesquisa e Conserva??o de Cavernas (CECAV/ICMBio) for providing permission to collect stalagmite samples. We are grateful to Augusto Auler and Bruna M. Cordeiro for guiding the first field trip to collect speleothems in Dona Benedita Cave. This study was financed in part by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior ? Brasil (CAPES) ? Finance Code 001.?This work was supported by the S?o Paulo Research Foundation (Grants #2016/24870-2, #2016/15807-5, #2017/50085-3, #2018/15774-5, #2018/07410?3 and #2019/06709-8) the Serrapilheira Institute (grant number: Serra-1812-27990) and the National Council for Scientific and Technological Development (CNPq) (Grant numbers: 308769/2018-0 to N.M.S and 426258/2016-9 to ITP). This work was supported by National Natural Science Foundation of China, NSFC 41888101 to HC. This work was also supported by the National Science Foundation grant EAR-2044535 and US-Israel Binational Science Foundation grant #2016402 to JMF. The IRM is a US National Multi-user Facility supported through the Instrumentation and Facilities Program of the National Science Foundation, Earth Sciences Division, and by funding from the University of Minnesota. This work has been partially performed at USPMag laboratory at Instituto de Astronomia, Geof?sica e Ci?ncias Atmosf?ricas (IAG) from Universidade de S?o Paulo (USP) funded by CAPES/FAPESP/CNPQ. Certain commercial equipment, instruments, materials, and software are identified in this paper to foster understanding. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.

Publisher Copyright:
© 2022, The Author(s).

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