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...
Published in: | Journal of the Geological Society |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2009
|
Subjects: | |
Online Access: | https://oro.open.ac.uk/18358/ https://doi.org/10.1144/0016-76492007-150 |
id |
ftopenunivgb:oai:oro.open.ac.uk:18358 |
---|---|
record_format |
openpolar |
spelling |
ftopenunivgb:oai:oro.open.ac.uk:18358 2023-06-11T04:13:11+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, Anne E. Niocaill, Conall Mac Widdowson, Mike Self, Stephen Turner, William 2009 https://oro.open.ac.uk/18358/ https://doi.org/10.1144/0016-76492007-150 unknown Jay, Anne E. <http://oro.open.ac.uk/view/person/aej63.html>; Niocaill, Conall Mac; Widdowson, Mike <http://oro.open.ac.uk/view/person/mw275.html>; Self, Stephen <http://oro.open.ac.uk/view/person/ss2693.html> and Turner, William (2009). New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces. Journal of the Geological Society, 166(1) pp. 13–24. Journal Item None PeerReviewed 2009 ftopenunivgb https://doi.org/10.1144/0016-76492007-150 2023-05-28T05:42:11Z 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 sub-regional detail in lava stacking patterns when applied at smaller spatial scales (<102–104 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. Article in Journal/Newspaper Iceland The Open University: Open Research Online (ORO) Journal of the Geological Society 166 1 13 24 |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
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 sub-regional detail in lava stacking patterns when applied at smaller spatial scales (<102–104 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. |
format |
Article in Journal/Newspaper |
author |
Jay, Anne E. Niocaill, Conall Mac Widdowson, Mike Self, Stephen Turner, William |
spellingShingle |
Jay, Anne E. Niocaill, Conall Mac Widdowson, Mike Self, Stephen Turner, William 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, Anne E. Niocaill, Conall Mac Widdowson, Mike Self, Stephen Turner, William |
author_sort |
Jay, Anne E. |
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 |
2009 |
url |
https://oro.open.ac.uk/18358/ https://doi.org/10.1144/0016-76492007-150 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Jay, Anne E. <http://oro.open.ac.uk/view/person/aej63.html>; Niocaill, Conall Mac; Widdowson, Mike <http://oro.open.ac.uk/view/person/mw275.html>; Self, Stephen <http://oro.open.ac.uk/view/person/ss2693.html> and Turner, William (2009). New palaeomagnetic data from the Mahabaleshwar Plateau, Deccan Flood Basalt Province, India: implications for the volcanostratigraphic architecture of continental flood basalt provinces. Journal of the Geological Society, 166(1) pp. 13–24. |
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 |
_version_ |
1768389893806882816 |