Environmental significance of speleothem magnetism

• Grant number: 16/24870-2
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): June 01, 2017
• Effective date (End): July 26, 2021
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal researcher: Ricardo Ivan Ferreira da Trindade
• Grantee: Plinio Francisco Jaqueto
• Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 19/06709-8 - Speleothem magnetism from the Last Glacial Maximum to the Holocene in South America, BE.EP.DR

Abstract

Speleothems provide long and continuous paleoenvironmental records with resolution typically ranging from years up to several hundreds of years. The first magnetic studies in speleothems focused only on geomagnetic paleosecular variations, but recent development on instrumentation and environmental magnetism techniques enabled the study of stalagmite magnetism to unprecedented resolution, approaching the one of stable isotope measurements. Recent studies that correlate geochemical and magnetic data suggest that environmental magnetism parameters can be used as a proxy for paleoprecipitation and soil dynamics in stalagmites. Yet, the full development of such magnetic proxy requires a better control on the magnetic mineral sources and processes in karstic systems, from soil formation above the cave to its transfer (and modification) inside the speleothem. This project aims to fill this gap by using state-of-the-art techniques to investigate at very-fine scale variations in the mineral assembly of stalagmites, cave sediments and soils above the cave at four targets in Northeast and Midwest Brazil (States of Bahia, Mato Grosso and Mato Grosso do Sul). Our main goals are: (1) to build a database of magnetic properties of stalagmites and soils above caves in South America at different latitudes and compare these data to the local climatic and soil record; (2) investigate in detail the transfer of iron-bearing minerals and iron in the ionic form from soils over the caves to the dripwater and finally into the stalagmite; (3) unveil the mechanisms responsible for variations in magnetic mineral content in stalagmites at millennial and centennial scales in order to evaluate the potential of this new and independent proxy for paleoprecipitation and soil dynamics in karstic regions. (AU)

Scientific publications

(6)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GREEN, THEODORE; SLOTZNICK, SARAH P.; JAQUETO, PLINIO; RAUB, TIMOTHY D.; TOHVER, ERIC; PLAYTON, TED E.; HAINES, PETER W.; KIRSCHVINK, JOSEPH L.; HOCKING, ROGER M.; MONTGOMERY, PAUL. igh-Resolution Late Devonian Magnetostratigraphy From the Canning Basin, Western Australia: A Re-Evaluatio. Frontiers in Earth Science, v. 9, NOV 24 2021. Web of Science Citations: 0.

JAQUETO, PLINIO; TRINDADE, RICARDO I. F.; FEINBERG, JOSHUA M.; CARMO, JANINE; NOVELLO, VALDIR F.; STRIKIS, NICOLAS M.; CRUZ, FRANCISCO W.; SHIMIZU, MARILIA H.; KARMANN, IVO. agnetic Mineralogy of Speleothems From Tropical-Subtropical Sites of South Americ. Frontiers in Earth Science, v. 9, APR 30 2021. Web of Science Citations: 0.

FU, ROGER R.; HESS, KIMBERLY; JAQUETO, PLINIO; NOVELLO, VALDIR F.; KUKLA, TYLER; TRINDADE, RICARDO I. F.; STRIKIS, NICOLAS M.; CRUZ, FRANCISCO W.; BEN DOR, OREN. High-Resolution Environmental Magnetism Using the Quantum Diamond Microscope (QDM): Application to a Tropical Speleothem. Frontiers in Earth Science, v. 8, JAN 14 2021. Web of Science Citations: 0.

USTRA, ANDREA; MENDONCA, CARLOS; LEITE, ARUA; JAQUETO, PLINIO; NOVELLO, VALDIR FELIPE. Low field frequency dependent magnetic susceptibility inversion. Computers & Geosciences, v. 133, DEC 2019. Web of Science Citations: 0.

NOVELLO, VALDIR F.; CRUZ, FRANCISCO W.; MCGLUE, MICHAEL M.; WONG, CORINNE I.; WARD, BRITTANY M.; VUILLE, MATHIAS; SANTOS, RUDNEY A.; JAQUETO, PLINIO; PESSENDA, LUIZ C. R.; ATORRE, TIAGO; RIBEIRO, LIGIA M. A. L.; KARMANN, IVO; BARRETO, ELINE S.; CHENG, HAI; EDWARDS, R. LAWRENCE; PAULA, MARCOS S.; SCHOLZ, DENIS. Vegetation and environmental changes in tropical South America from the last glacial to the Holocene documented by multiple cave sediment proxies. Earth and Planetary Science Letters, v. 524, OCT 15 2019. Web of Science Citations: 0.

TRINDADE, RICARDO I. F.; JAQUETO, PLINIO; TERRA-NOVA, FILIPE; BRANDT, DANIELE; HARTMANN, GELVAM A.; FEINBERG, JOSHUA M.; STRAUSS, BECKY E.; NOVELLO, VALDIR F.; CRUZ, FRANCISCO W.; KARMANN, IVO; CHENG, HAI; EDWARDS, R. LAWRENCE. Speleothem record of geomagnetic South Atlantic Anomaly recurrence. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v. 115, n. 52, p. 13198-13203, DEC 26 2018. Web of Science Citations: 5.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

JAQUETO, Plinio Francisco. Speleothem magnetism: environmental and geomagnetic records from Brazil. 2021. Doctoral Thesis - Universidade de São Paulo (USP). Instituto Astronômico e Geofísico (IAG/SBD) São Paulo.