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

Abstract 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...

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Autores principales:	Radhakrishna T., Asanulla R. Mohamed, Venkateshwarlu M., Soumya G. S.
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a5ee85566fd943c3958cbc97c6e7e9f2
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spelling	oai:doaj.org-article:a5ee85566fd943c3958cbc97c6e7e9f22021-12-02T16:32:12ZLow geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection10.1038/s41598-020-67245-62045-2322https://doaj.org/article/a5ee85566fd943c3958cbc97c6e7e9f22020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-67245-6https://doaj.org/toc/2045-2322Abstract 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.Radhakrishna T.Asanulla R. MohamedVenkateshwarlu M.Soumya G. S.Nature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-6 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Radhakrishna T. Asanulla R. Mohamed Venkateshwarlu M. Soumya G. S. Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection
description	Abstract 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.
format	article
author	Radhakrishna T. Asanulla R. Mohamed Venkateshwarlu M. Soumya G. S.
author_facet	Radhakrishna T. Asanulla R. Mohamed Venkateshwarlu M. Soumya G. S.
author_sort	Radhakrishna T.
title	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_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_sort	low geomagnetic field strength during end-cretaceous deccan volcanism and whole mantle convection
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/a5ee85566fd943c3958cbc97c6e7e9f2
work_keys_str_mv	AT radhakrishnat lowgeomagneticfieldstrengthduringendcretaceousdeccanvolcanismandwholemantleconvection AT asanullarmohamed lowgeomagneticfieldstrengthduringendcretaceousdeccanvolcanismandwholemantleconvection AT venkateshwarlum lowgeomagneticfieldstrengthduringendcretaceousdeccanvolcanismandwholemantleconvection AT soumyags lowgeomagneticfieldstrengthduringendcretaceousdeccanvolcanismandwholemantleconvection
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Low geomagnetic field strength during End-Cretaceous Deccan volcanism and whole mantle convection

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