Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology
The Late Cretaceous magmatism in Madagascar is correlated with the break-up between Madagascar and Greater India, with a presumed track of a hotspot from Madagascar towards the Marion Island and with an anoxic event in the Late Cretaceous. The lava succession and associated dyke swarms and sills of...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/876813 2024-06-23T07:54:32+00:00 Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology Ciro Cucciniello Vincenzo Morra Leone Melluso Fred Jourdan Cucciniello, Ciro Morra, Vincenzo Melluso, Leone Jourdan, Fred 2022 http://hdl.handle.net/11588/876813 https://doi.org/10.1144/SP518-2020-275 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000768879700014 ispartofbook:Large Igneous Provinces and their Plumbing Systems volume:518 firstpage:325 lastpage:340 numberofpages:16 serie:GEOLOGICAL SOCIETY, LONDON, SPECIAL PUBLICATIONS http://hdl.handle.net/11588/876813 doi:10.1144/SP518-2020-275 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85112601237 info:eu-repo/semantics/bookPart 2022 ftunivnapoliiris https://doi.org/10.1144/SP518-2020-275 2024-06-10T14:58:52Z The Late Cretaceous magmatism in Madagascar is correlated with the break-up between Madagascar and Greater India, with a presumed track of a hotspot from Madagascar towards the Marion Island and with an anoxic event in the Late Cretaceous. The lava succession and associated dyke swarms and sills of western Madagascar (Mailaka area) represent a volumetrically important area of the igneous province, where dykes with random orientation, several igneous intrusions and a flood basalt to rhyodacite sequence do occur. The magmas have a tholeiitic and weakly alkaline affinity. Using plagioclase separates, we obtained two plateau 40Ar/39Ar ages, and an inverse isochron age statistically indistinguishable, ranging from 92.9 ± 3.8 to 91.2 ± 1.3 Ma (2σ). These ages indicate that tholeiitic and alkaline rocks were erupted in the same age span. In addition, these ages are close to the Cenomanian–Turonian (C–T; 93.9 ± 0.2 Ma) boundary and are indistinguishable from the U–Pb ages available for the capping rhyodacitic unit of the Mailaka lava succession. A filtered compilation of eight ages for northern and central-western Madagascar rocks suggests a duration for the magmatic activity in this part of Madagascar province of the order of c. 3 Ma. If the western Madagascar magmatism is plume related, the plume head would need to have been located near the Mailaka area at c. 93 Ma. The geochemistry of the mafic lavas and dykes of western Madagascar is barely distinguishable from mid-ocean ridge basalt (MORB), with an increasing crustal contamination towards the evolved rocks, and does not constrain input of typical components derived by plume magmatism. Book Part Marion Island IRIS Università degli Studi di Napoli Federico II Geological Society, London, Special Publications 518 1 325 340 |
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IRIS Università degli Studi di Napoli Federico II |
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ftunivnapoliiris |
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English |
description |
The Late Cretaceous magmatism in Madagascar is correlated with the break-up between Madagascar and Greater India, with a presumed track of a hotspot from Madagascar towards the Marion Island and with an anoxic event in the Late Cretaceous. The lava succession and associated dyke swarms and sills of western Madagascar (Mailaka area) represent a volumetrically important area of the igneous province, where dykes with random orientation, several igneous intrusions and a flood basalt to rhyodacite sequence do occur. The magmas have a tholeiitic and weakly alkaline affinity. Using plagioclase separates, we obtained two plateau 40Ar/39Ar ages, and an inverse isochron age statistically indistinguishable, ranging from 92.9 ± 3.8 to 91.2 ± 1.3 Ma (2σ). These ages indicate that tholeiitic and alkaline rocks were erupted in the same age span. In addition, these ages are close to the Cenomanian–Turonian (C–T; 93.9 ± 0.2 Ma) boundary and are indistinguishable from the U–Pb ages available for the capping rhyodacitic unit of the Mailaka lava succession. A filtered compilation of eight ages for northern and central-western Madagascar rocks suggests a duration for the magmatic activity in this part of Madagascar province of the order of c. 3 Ma. If the western Madagascar magmatism is plume related, the plume head would need to have been located near the Mailaka area at c. 93 Ma. The geochemistry of the mafic lavas and dykes of western Madagascar is barely distinguishable from mid-ocean ridge basalt (MORB), with an increasing crustal contamination towards the evolved rocks, and does not constrain input of typical components derived by plume magmatism. |
author2 |
Cucciniello, Ciro Morra, Vincenzo Melluso, Leone Jourdan, Fred |
format |
Book Part |
author |
Ciro Cucciniello Vincenzo Morra Leone Melluso Fred Jourdan |
spellingShingle |
Ciro Cucciniello Vincenzo Morra Leone Melluso Fred Jourdan Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
author_facet |
Ciro Cucciniello Vincenzo Morra Leone Melluso Fred Jourdan |
author_sort |
Ciro Cucciniello |
title |
Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
title_short |
Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
title_full |
Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
title_fullStr |
Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
title_full_unstemmed |
Constraints on duration, age and migration of the feeder systems of the Madagascan Flood Basalt Province from high-precision 40Ar/39Ar chronology |
title_sort |
constraints on duration, age and migration of the feeder systems of the madagascan flood basalt province from high-precision 40ar/39ar chronology |
publishDate |
2022 |
url |
http://hdl.handle.net/11588/876813 https://doi.org/10.1144/SP518-2020-275 |
genre |
Marion Island |
genre_facet |
Marion Island |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000768879700014 ispartofbook:Large Igneous Provinces and their Plumbing Systems volume:518 firstpage:325 lastpage:340 numberofpages:16 serie:GEOLOGICAL SOCIETY, LONDON, SPECIAL PUBLICATIONS http://hdl.handle.net/11588/876813 doi:10.1144/SP518-2020-275 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85112601237 |
op_doi |
https://doi.org/10.1144/SP518-2020-275 |
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Geological Society, London, Special Publications |
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518 |
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325 |
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340 |
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