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Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection

Knowledge about long-term variation of the geomagnetic dipole field remains in its nascent stage because of the paucity of reliable experimental data over geological periods. Here, we present the first robust experimental data from the largest Cretaceous flood basalt province on Earth, the ~65–66 Ma...

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Autores principales: T., Radhakrishna, Mohamed, Asanulla R., M., Venkateshwarlu, S., Soumya G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7329830/
https://www.ncbi.nlm.nih.gov/pubmed/32612206
http://dx.doi.org/10.1038/s41598-020-67245-6
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author T., Radhakrishna
Mohamed, Asanulla R.
M., Venkateshwarlu
S., Soumya G.
author_facet T., Radhakrishna
Mohamed, Asanulla R.
M., Venkateshwarlu
S., Soumya G.
author_sort T., Radhakrishna
collection PubMed
description Knowledge about long-term variation of the geomagnetic dipole field remains in its nascent stage because of the paucity of reliable experimental data over geological periods. Here, we present the first robust experimental data from the largest Cretaceous flood basalt province on Earth, the ~65–66 Ma Deccan basalt within a thick (1250 m) unbiased stratigraphic section down to the basement, recovered from a drill hole of the Koyna Deep Scientific Drilling Project in the Western Ghats, India. Critical analysis of the result along with similar results of the Cretaceous age find that (i) the dipole moment during the end Cretaceous Deccan eruption is the lowest in whole of Cretaceous (ii) dipole moment at the onset/termination of the Cretaceous Normal Superchron is apparently lower relative to that in mid-superchron, however, such differences cannot be deciphered in shorter polarities probably because of insufficient time to develop recognizable variations (iii) inverse relation between dipole moment and reversal rate is lacking and (iv) a cause and effect relation between core-mantle boundary heat flux and low dipole moment that appears to be the principle governing factor in forming the Large Igneous Provinces on the surface of earth.
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spelling pubmed-73298302020-07-06 Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection T., Radhakrishna Mohamed, Asanulla R. M., Venkateshwarlu S., Soumya G. Sci Rep Article Knowledge about long-term variation of the geomagnetic dipole field remains in its nascent stage because of the paucity of reliable experimental data over geological periods. Here, we present the first robust experimental data from the largest Cretaceous flood basalt province on Earth, the ~65–66 Ma Deccan basalt within a thick (1250 m) unbiased stratigraphic section down to the basement, recovered from a drill hole of the Koyna Deep Scientific Drilling Project in the Western Ghats, India. Critical analysis of the result along with similar results of the Cretaceous age find that (i) the dipole moment during the end Cretaceous Deccan eruption is the lowest in whole of Cretaceous (ii) dipole moment at the onset/termination of the Cretaceous Normal Superchron is apparently lower relative to that in mid-superchron, however, such differences cannot be deciphered in shorter polarities probably because of insufficient time to develop recognizable variations (iii) inverse relation between dipole moment and reversal rate is lacking and (iv) a cause and effect relation between core-mantle boundary heat flux and low dipole moment that appears to be the principle governing factor in forming the Large Igneous Provinces on the surface of earth. Nature Publishing Group UK 2020-07-01 /pmc/articles/PMC7329830/ /pubmed/32612206 http://dx.doi.org/10.1038/s41598-020-67245-6 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
T., Radhakrishna
Mohamed, Asanulla R.
M., Venkateshwarlu
S., Soumya G.
Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title_full Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title_fullStr Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title_full_unstemmed Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title_short Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
title_sort low geomagnetic field strength during end-cretaceous deccan volcanism and whole mantle convection
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7329830/
https://www.ncbi.nlm.nih.gov/pubmed/32612206
http://dx.doi.org/10.1038/s41598-020-67245-6
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