Volcanisme de l'île aux Pingouins, archipel Crozet, témoin de l'hétérogénéité du manteau fertile au sud de l'océan Indien

André Giret; Sylvie Tourpin; Sabine Marc; Olivier Verdier; Jean Yves Cottin

doi:10.1016/S1631-0713(02)01780-7

Volcanisme de l'île aux Pingouins, archipel Crozet, témoin de l'hétérogénéité du manteau fertile au sud de l'océan Indien

Translated title of the contribution: Penguins Island, Crozet archipelago, volcanic evidence for a heterogeneous mantle in the southern Indian Ocean

André Giret, Sylvie Tourpin, Sabine Marc, Olivier Verdier, Jean Yves Cottin

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Despite its small area (5.6 km²), the Penguins Island brings magmatic information concerning mantle geochemical heterogeneities in southwestern Indian Ocean. The volcanism that built the island was firstly associated with marine deposits, and secondly with aerial, giving then abundant volcanic breccias and lava flows. The rocks are weakly differentiated and result of magmatic fractionation from picritic to tephritic types. K-Ar ages are near 1.1 Ma. The magmatic source may be related to a HIMU reservoir or to EMI ± EMII ones, depending on the geochemical evidences that are taken into account. However, comparisons with the Marion Island, on the same oceanic plateau and far to the west, as well as with Kerguelen Islands, far to the east, suggest a very heterogeneous mantle source.

Translated title of the contribution	Penguins Island, Crozet archipelago, volcanic evidence for a heterogeneous mantle in the southern Indian Ocean
Original language	French
Pages (from-to)	481-488
Number of pages	8
Journal	Comptes Rendus Geoscience
Volume	334
Issue number	7
DOIs	https://doi.org/10.1016/S1631-0713(02)01780-7
Publication status	Published - 2002
Externally published	Yes

Keywords

Crozet
Hot spot
Indian Ocean
Mantle
Volcanism

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10.1016/S1631-0713(02)01780-7

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title = "Volcanisme de l'{\^i}le aux Pingouins, archipel Crozet, t{\'e}moin de l'h{\'e}t{\'e}rog{\'e}n{\'e}it{\'e} du manteau fertile au sud de l'oc{\'e}an Indien",

abstract = "Despite its small area (5.6 km2), the Penguins Island brings magmatic information concerning mantle geochemical heterogeneities in southwestern Indian Ocean. The volcanism that built the island was firstly associated with marine deposits, and secondly with aerial, giving then abundant volcanic breccias and lava flows. The rocks are weakly differentiated and result of magmatic fractionation from picritic to tephritic types. K-Ar ages are near 1.1 Ma. The magmatic source may be related to a HIMU reservoir or to EMI ± EMII ones, depending on the geochemical evidences that are taken into account. However, comparisons with the Marion Island, on the same oceanic plateau and far to the west, as well as with Kerguelen Islands, far to the east, suggest a very heterogeneous mantle source.",

keywords = "Crozet, Hot spot, Indian Ocean, Mantle, Volcanism",

author = "Andr{\'e} Giret and Sylvie Tourpin and Sabine Marc and Olivier Verdier and Cottin, {Jean Yves}",

year = "2002",

doi = "10.1016/S1631-0713(02)01780-7",

language = "French",

volume = "334",

pages = "481--488",

journal = "Comptes Rendus Geoscience",

issn = "1631-0713",

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number = "7",

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AU - Giret, André

AU - Tourpin, Sylvie

AU - Marc, Sabine

AU - Verdier, Olivier

AU - Cottin, Jean Yves

PY - 2002

Y1 - 2002

N2 - Despite its small area (5.6 km2), the Penguins Island brings magmatic information concerning mantle geochemical heterogeneities in southwestern Indian Ocean. The volcanism that built the island was firstly associated with marine deposits, and secondly with aerial, giving then abundant volcanic breccias and lava flows. The rocks are weakly differentiated and result of magmatic fractionation from picritic to tephritic types. K-Ar ages are near 1.1 Ma. The magmatic source may be related to a HIMU reservoir or to EMI ± EMII ones, depending on the geochemical evidences that are taken into account. However, comparisons with the Marion Island, on the same oceanic plateau and far to the west, as well as with Kerguelen Islands, far to the east, suggest a very heterogeneous mantle source.

AB - Despite its small area (5.6 km2), the Penguins Island brings magmatic information concerning mantle geochemical heterogeneities in southwestern Indian Ocean. The volcanism that built the island was firstly associated with marine deposits, and secondly with aerial, giving then abundant volcanic breccias and lava flows. The rocks are weakly differentiated and result of magmatic fractionation from picritic to tephritic types. K-Ar ages are near 1.1 Ma. The magmatic source may be related to a HIMU reservoir or to EMI ± EMII ones, depending on the geochemical evidences that are taken into account. However, comparisons with the Marion Island, on the same oceanic plateau and far to the west, as well as with Kerguelen Islands, far to the east, suggest a very heterogeneous mantle source.

KW - Crozet

KW - Hot spot

KW - Indian Ocean

KW - Mantle

KW - Volcanism

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Volcanisme de l'île aux Pingouins, archipel Crozet, témoin de l'hétérogénéité du manteau fertile au sud de l'océan Indien

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Keywords

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