Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages.
The Tore-Madeira Rise is a seamount chain located 300 km off the Portugal and Morocco coastsattributed to hotspot activity. U-Pb ages of lavas from the northern and central Tore-Madeira Rise rangebetween 103 and 80.5 Ma whereas 40Ar/39Ar ages from the central and southern Tore-Madeira Rise yield age...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Geological Society Publishing House
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/47430 |
| _version_ | 1848757830496026624 |
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| author | Merle, R. Jourdan, Fred Marzoli, A. Renne, P. Grange, Marion Girardeau, J. |
| author_facet | Merle, R. Jourdan, Fred Marzoli, A. Renne, P. Grange, Marion Girardeau, J. |
| author_sort | Merle, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Tore-Madeira Rise is a seamount chain located 300 km off the Portugal and Morocco coastsattributed to hotspot activity. U-Pb ages of lavas from the northern and central Tore-Madeira Rise rangebetween 103 and 80.5 Ma whereas 40Ar/39Ar ages from the central and southern Tore-Madeira Rise yield ages ranging from 94.5 to 0.5 Ma. We performed new 40Ar/39Ar measurements to better understand the geodynamic history of the Tore-Madeira Rise. Plagioclase ages from the Bikini Bottom and Torillon seamounts suggest ages of .90 Ma and >60 Ma, respectively. Amphiboles from the Seine seamount yield an age of 24.0 +- 0.8 Ma. Biotites from lavas of the Ashton seamount give ages of 97.4 +- 1.1 Ma and 97.8 +- 1.1 Ma. The geochronological database available on the Tore-Madeira Rise has been filtered on statistical criteria to eliminate unreliable ages. The resulting database reveals three pulses of alkaline magmatism on the Tore-Madeira Rise at 103-80.5 Ma, at c. 68 Ma and between 30 Ma and the present. The magmatism was continuous from 103 Ma until c. 68 Ma and from c. 30 Ma until the present on the Tore-Madeira Rise, the surrounding seamounts and the Portugal coast. We suggest that the space-time distribution of this magmatism results from the interaction between a wide thermal anomaly emitting magmatic pulses and the complex motion of the Iberian plate. |
| first_indexed | 2025-11-14T09:34:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-47430 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:34:20Z |
| publishDate | 2009 |
| publisher | Geological Society Publishing House |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-474302018-12-14T00:55:14Z Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. Merle, R. Jourdan, Fred Marzoli, A. Renne, P. Grange, Marion Girardeau, J. The Tore-Madeira Rise is a seamount chain located 300 km off the Portugal and Morocco coastsattributed to hotspot activity. U-Pb ages of lavas from the northern and central Tore-Madeira Rise rangebetween 103 and 80.5 Ma whereas 40Ar/39Ar ages from the central and southern Tore-Madeira Rise yield ages ranging from 94.5 to 0.5 Ma. We performed new 40Ar/39Ar measurements to better understand the geodynamic history of the Tore-Madeira Rise. Plagioclase ages from the Bikini Bottom and Torillon seamounts suggest ages of .90 Ma and >60 Ma, respectively. Amphiboles from the Seine seamount yield an age of 24.0 +- 0.8 Ma. Biotites from lavas of the Ashton seamount give ages of 97.4 +- 1.1 Ma and 97.8 +- 1.1 Ma. The geochronological database available on the Tore-Madeira Rise has been filtered on statistical criteria to eliminate unreliable ages. The resulting database reveals three pulses of alkaline magmatism on the Tore-Madeira Rise at 103-80.5 Ma, at c. 68 Ma and between 30 Ma and the present. The magmatism was continuous from 103 Ma until c. 68 Ma and from c. 30 Ma until the present on the Tore-Madeira Rise, the surrounding seamounts and the Portugal coast. We suggest that the space-time distribution of this magmatism results from the interaction between a wide thermal anomaly emitting magmatic pulses and the complex motion of the Iberian plate. 2009 Journal Article http://hdl.handle.net/20.500.11937/47430 10.1144/0016-76492008-060 Geological Society Publishing House fulltext |
| spellingShingle | Merle, R. Jourdan, Fred Marzoli, A. Renne, P. Grange, Marion Girardeau, J. Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title_full | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title_fullStr | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title_full_unstemmed | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title_short | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. |
| title_sort | evidence of multi-phase cretaceous to quaternary alkaline magmatism on tore-madeira rise and neighbouring seamounts from 40ar/39ar ages. |
| url | http://hdl.handle.net/20.500.11937/47430 |