Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages.
dc.contributor.author | Merle, R. | |
dc.contributor.author | Jourdan, Fred | |
dc.contributor.author | Marzoli, A. | |
dc.contributor.author | Renne, P. | |
dc.contributor.author | Grange, Marion | |
dc.contributor.author | Girardeau, J. | |
dc.date.accessioned | 2017-01-30T15:33:15Z | |
dc.date.available | 2017-01-30T15:33:15Z | |
dc.date.created | 2009-08-27T20:02:01Z | |
dc.date.issued | 2009 | |
dc.identifier.citation | Merle, Renaud and Jourdan, Fred and Marzoli, Andrea and Renne, Paul and Grange, Marion and Girardeau, Jaques. 2009. Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. Journal of the Geological Society. 166 (5): pp. 879-894. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/47430 | |
dc.identifier.doi | 10.1144/0016-76492008-060 | |
dc.description.abstract |
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. | |
dc.publisher | Geological Society Publishing House | |
dc.title | Evidence of multi-phase Cretaceous to Quaternary alkaline magmatism on Tore-Madeira Rise and neighbouring seamounts from 40Ar/39Ar ages. | |
dc.type | Journal Article | |
dcterms.source.volume | 166 | |
dcterms.source.number | 5 | |
dcterms.source.startPage | 879 | |
dcterms.source.endPage | 894 | |
dcterms.source.issn | 00167649 | |
dcterms.source.title | Journal of the Geological Society | |
curtin.note |
The link to abstract in 'Lyell Collection' is: | |
curtin.accessStatus | Open access | |
curtin.faculty | The Western Australia School of Mines | |
curtin.faculty | Department of Applied Geology | |
curtin.faculty | Faculty of Science and Engineering |