New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces
New magnetostratigraphic data from seven Western Ghats sections in the Deccan Volcanic Province are presented. These are combined with an established geochemically defined stratigraphy, and volcanological logs, to provide a correlated, chronological eruptive framework. We identify two magnetic polar...
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Online Access: | https://doi.org/10.1144/0016-76492007-150 https://ora.ox.ac.uk/objects/uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 2023-05-15T16:50:35+02:00 New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces Jay, A Mac Niocaill, C Widdowson, M Self, S Turner, W 2016-07-28 https://doi.org/10.1144/0016-76492007-150 https://ora.ox.ac.uk/objects/uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 eng eng doi:10.1144/0016-76492007-150 https://ora.ox.ac.uk/objects/uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 https://doi.org/10.1144/0016-76492007-150 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1144/0016-76492007-150 2022-06-28T20:07:49Z New magnetostratigraphic data from seven Western Ghats sections in the Deccan Volcanic Province are presented. These are combined with an established geochemically defined stratigraphy, and volcanological logs, to provide a correlated, chronological eruptive framework. We identify two magnetic polarities in five of the sections, and these are assigned to chrons 29r and 29n. Importantly, the reversal boundary represents an identifiable isochronous surface within the volcanic pile. This surface occurs at different elevations, as does the altitude of the geochemically defined formation boundary (i.e. Ambenali-Mahabaleshwar Fms), which defines a second isochronous surface. Inspection reveals significant differences in the number and thickness of lava units preserved between these two surfaces. This indicates that there was significant local topography (c. 80 m) across Deccan Volcanic Province lava fields during their development; an interpretation consistent with topographies observed across modern and historical examples (e.g. Hawaii, Iceland). These data also indicate that the geochemical stratigraphies of continental flood basalt provinces can mask local and subregional detail in lava stacking patterns when applied at smaller spatial scales (<10 2 - 10 4 m). Finally, transitional (R-N) directions preserved in some eruptive units place constraints upon the rates of eruption, and indicate c. 2 ka periods of volcanic repose. © 2009 Geological Society of London. Article in Journal/Newspaper Iceland ORA - Oxford University Research Archive Journal of the Geological Society 166 1 13 24 |
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Open Polar |
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ORA - Oxford University Research Archive |
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ftuloxford |
language |
English |
description |
New magnetostratigraphic data from seven Western Ghats sections in the Deccan Volcanic Province are presented. These are combined with an established geochemically defined stratigraphy, and volcanological logs, to provide a correlated, chronological eruptive framework. We identify two magnetic polarities in five of the sections, and these are assigned to chrons 29r and 29n. Importantly, the reversal boundary represents an identifiable isochronous surface within the volcanic pile. This surface occurs at different elevations, as does the altitude of the geochemically defined formation boundary (i.e. Ambenali-Mahabaleshwar Fms), which defines a second isochronous surface. Inspection reveals significant differences in the number and thickness of lava units preserved between these two surfaces. This indicates that there was significant local topography (c. 80 m) across Deccan Volcanic Province lava fields during their development; an interpretation consistent with topographies observed across modern and historical examples (e.g. Hawaii, Iceland). These data also indicate that the geochemical stratigraphies of continental flood basalt provinces can mask local and subregional detail in lava stacking patterns when applied at smaller spatial scales (<10 2 - 10 4 m). Finally, transitional (R-N) directions preserved in some eruptive units place constraints upon the rates of eruption, and indicate c. 2 ka periods of volcanic repose. © 2009 Geological Society of London. |
format |
Article in Journal/Newspaper |
author |
Jay, A Mac Niocaill, C Widdowson, M Self, S Turner, W |
spellingShingle |
Jay, A Mac Niocaill, C Widdowson, M Self, S Turner, W New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
author_facet |
Jay, A Mac Niocaill, C Widdowson, M Self, S Turner, W |
author_sort |
Jay, A |
title |
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
title_short |
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
title_full |
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
title_fullStr |
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
title_full_unstemmed |
New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
title_sort |
new palaeomagnetic data from the mahabaleshwar plateau, deccan flood basalt province, india: implications for the volcanostratigraphic architecture of continental flood basalt provinces |
publishDate |
2016 |
url |
https://doi.org/10.1144/0016-76492007-150 https://ora.ox.ac.uk/objects/uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
doi:10.1144/0016-76492007-150 https://ora.ox.ac.uk/objects/uuid:2310ede5-f3f5-439d-9571-d13f7770c8a6 https://doi.org/10.1144/0016-76492007-150 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1144/0016-76492007-150 |
container_title |
Journal of the Geological Society |
container_volume |
166 |
container_issue |
1 |
container_start_page |
13 |
op_container_end_page |
24 |
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1766040719226568704 |