Microwave palaeointensity results from the Matuyama-Brunhes geomagnetic field reversal

Maxwell C. Brown; Martin N. Gratton; John Shaw; Richard Holme; Vicente Soler

doi:10.1016/j.pepi.2008.11.001

Microwave palaeointensity results from the Matuyama-Brunhes geomagnetic field reversal

Maxwell C. Brown, Martin N. Gratton, John Shaw, Richard Holme, Vicente Soler

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

We present new palaeointensity and palaeodirectional results from the Matuyama-Brunhes geomagnetic field reversal. Volcanic sequences from La Palma and Guadeloupe record the Matuyama-Brunhes boundary, possible precursors, and fluctuations in the magnetic field prior to the main polarity reversal. Absolute palaeointensity was determined using the microwave technique and palaeodirectional results were obtained from thermal demagnetisation. Ten flows from the 29 flows studied gave reliable mean palaeointensities; however, only 1 of the 10 flows records a transitional direction. The VDM determined from this flow is 1.9 ± 0.6 (± σ) × 1 0²² A m². Analysis of all Matuyama-Brunhes data suggests that the main directional changes occurred once the VDM was reduced below 3 × 1 0²² A m²(∼35% of the present field value). Crown

Original language	English (US)
Pages (from-to)	75-102
Number of pages	28
Journal	Physics of the Earth and Planetary Interiors
Volume	173
Issue number	1-2
DOIs	https://doi.org/10.1016/j.pepi.2008.11.001
State	Published - Mar 2009
Externally published	Yes

Bibliographical note

Funding Information:
This work was carried out under NERC grants NER/S/J/2004/13080 and NERC/A/S/2003/00330 and a visiting fellowship to the Institute for Rock Magnetism, University of Minnesota. The microwave instrumentation was funded by NERC grant NE/B50572X/1. The Institute for Rock Magnetism is supported by a grant from the Instruments and Facilities program, Earth Science Division, the National Science Foundation. Roman Leonhardt and Karl Fabian are thanked for their time and for providing us with the code for the IMMAB4 model. Monika Korte is thanked for providing the CALS7K.2 model. Elisabeth Schnepp and an anonymous reviewer are thanked for their comments. Edward Horncastle, Amy Chen, Yuhji Yamamoto, Mimi Hill, Neil Suttie, Mike Jackson and John Share are thanked for scientific discussions and their experimental assistance. We would like to thank the Medio Ambiente of Santa Cruz de La Palma for providing us with sampling permits.

Keywords

Guadeloupe
La Palma
Matuyama-Brunhes
Microwave
Palaeointensity
Palaeomagnetism
Reversals

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@article{e19b67273c204a98ad55715ea09443b0,

title = "Microwave palaeointensity results from the Matuyama-Brunhes geomagnetic field reversal",

abstract = "We present new palaeointensity and palaeodirectional results from the Matuyama-Brunhes geomagnetic field reversal. Volcanic sequences from La Palma and Guadeloupe record the Matuyama-Brunhes boundary, possible precursors, and fluctuations in the magnetic field prior to the main polarity reversal. Absolute palaeointensity was determined using the microwave technique and palaeodirectional results were obtained from thermal demagnetisation. Ten flows from the 29 flows studied gave reliable mean palaeointensities; however, only 1 of the 10 flows records a transitional direction. The VDM determined from this flow is 1.9 ± 0.6 (± σ) × 1 022 A m2. Analysis of all Matuyama-Brunhes data suggests that the main directional changes occurred once the VDM was reduced below 3 × 1 022 A m2(∼35% of the present field value). Crown",

keywords = "Guadeloupe, La Palma, Matuyama-Brunhes, Microwave, Palaeointensity, Palaeomagnetism, Reversals",

author = "Brown, {Maxwell C.} and Gratton, {Martin N.} and John Shaw and Richard Holme and Vicente Soler",

note = "Funding Information: This work was carried out under NERC grants NER/S/J/2004/13080 and NERC/A/S/2003/00330 and a visiting fellowship to the Institute for Rock Magnetism, University of Minnesota. The microwave instrumentation was funded by NERC grant NE/B50572X/1. The Institute for Rock Magnetism is supported by a grant from the Instruments and Facilities program, Earth Science Division, the National Science Foundation. Roman Leonhardt and Karl Fabian are thanked for their time and for providing us with the code for the IMMAB4 model. Monika Korte is thanked for providing the CALS7K.2 model. Elisabeth Schnepp and an anonymous reviewer are thanked for their comments. Edward Horncastle, Amy Chen, Yuhji Yamamoto, Mimi Hill, Neil Suttie, Mike Jackson and John Share are thanked for scientific discussions and their experimental assistance. We would like to thank the Medio Ambiente of Santa Cruz de La Palma for providing us with sampling permits. ",

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AU - Gratton, Martin N.

AU - Shaw, John

AU - Holme, Richard

AU - Soler, Vicente

N1 - Funding Information: This work was carried out under NERC grants NER/S/J/2004/13080 and NERC/A/S/2003/00330 and a visiting fellowship to the Institute for Rock Magnetism, University of Minnesota. The microwave instrumentation was funded by NERC grant NE/B50572X/1. The Institute for Rock Magnetism is supported by a grant from the Instruments and Facilities program, Earth Science Division, the National Science Foundation. Roman Leonhardt and Karl Fabian are thanked for their time and for providing us with the code for the IMMAB4 model. Monika Korte is thanked for providing the CALS7K.2 model. Elisabeth Schnepp and an anonymous reviewer are thanked for their comments. Edward Horncastle, Amy Chen, Yuhji Yamamoto, Mimi Hill, Neil Suttie, Mike Jackson and John Share are thanked for scientific discussions and their experimental assistance. We would like to thank the Medio Ambiente of Santa Cruz de La Palma for providing us with sampling permits.

PY - 2009/3

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N2 - We present new palaeointensity and palaeodirectional results from the Matuyama-Brunhes geomagnetic field reversal. Volcanic sequences from La Palma and Guadeloupe record the Matuyama-Brunhes boundary, possible precursors, and fluctuations in the magnetic field prior to the main polarity reversal. Absolute palaeointensity was determined using the microwave technique and palaeodirectional results were obtained from thermal demagnetisation. Ten flows from the 29 flows studied gave reliable mean palaeointensities; however, only 1 of the 10 flows records a transitional direction. The VDM determined from this flow is 1.9 ± 0.6 (± σ) × 1 022 A m2. Analysis of all Matuyama-Brunhes data suggests that the main directional changes occurred once the VDM was reduced below 3 × 1 022 A m2(∼35% of the present field value). Crown

AB - We present new palaeointensity and palaeodirectional results from the Matuyama-Brunhes geomagnetic field reversal. Volcanic sequences from La Palma and Guadeloupe record the Matuyama-Brunhes boundary, possible precursors, and fluctuations in the magnetic field prior to the main polarity reversal. Absolute palaeointensity was determined using the microwave technique and palaeodirectional results were obtained from thermal demagnetisation. Ten flows from the 29 flows studied gave reliable mean palaeointensities; however, only 1 of the 10 flows records a transitional direction. The VDM determined from this flow is 1.9 ± 0.6 (± σ) × 1 022 A m2. Analysis of all Matuyama-Brunhes data suggests that the main directional changes occurred once the VDM was reduced below 3 × 1 022 A m2(∼35% of the present field value). Crown

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KW - La Palma

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KW - Microwave

KW - Palaeointensity

KW - Palaeomagnetism

KW - Reversals

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ER -

Microwave palaeointensity results from the Matuyama-Brunhes geomagnetic field reversal

Abstract

Bibliographical note

Keywords

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