2009
DOI: 10.1016/j.jvolgeores.2009.05.002
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A late-Ordovician phreatomagmatic complex in marine soft-substrate environment: The Crozon volcanic system, Armorican Massif (France)

Abstract: International audienceThe mafic lavas and the diabases of Crozon (Armorican Massif, France), belong to an anorogenic Ordovician volcanic complex, emplaced on a rifted passive margin in North Gondwana. Magma passed through syn-volcanic soft sedimentary substrate, which is today mostly composed of alternating sandstones and mudstones, from Llanvirn to Ashgill in age. Field observations together with microscopic studies and geochemical analyses of magmatic rocks lead us to propose a model of volcano formation whi… Show more

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Cited by 18 publications
(6 citation statements)
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“…We suspect a genetic link with a coeval thermal event (Clauer et al, 1995) and the local denudation of Ediacaran basement rocks (Tahiri et al, 2010) (Fig. 7), both possibly related to the magmatic (e.g., Caroff et al, 2009) and/or extensional events (e.g., Martinez-Catalan et al, 1992) affecting the north-Gondwana domain at the end of the Ordovician. The late Tonian population, which is absent from sample 15DL12 from Cambrian strata of Coastal Meseta (Letsch et al, 2018;Fig.…”
Section: Deciphering Sediment Sourcesmentioning
confidence: 96%
“…We suspect a genetic link with a coeval thermal event (Clauer et al, 1995) and the local denudation of Ediacaran basement rocks (Tahiri et al, 2010) (Fig. 7), both possibly related to the magmatic (e.g., Caroff et al, 2009) and/or extensional events (e.g., Martinez-Catalan et al, 1992) affecting the north-Gondwana domain at the end of the Ordovician. The late Tonian population, which is absent from sample 15DL12 from Cambrian strata of Coastal Meseta (Letsch et al, 2018;Fig.…”
Section: Deciphering Sediment Sourcesmentioning
confidence: 96%
“…After a major sea-level fall, the sedimentation continued into the Katian with micaceous sandstones, quartzarenites and mudstones of the Kermeur Fm that were laid down in bay/lagoon-barrier environments evolving towards open shelf settings (Gorini et al, 2008;Vidal et al, 2011a). Upper Katian carbonates (Rosan Fm) were deposited in places, in conjunction with anorogenic volcanics (Caroff et al, 2009). The Hirnantian glacial event is represented by glaciomarine facies (Cosquer Fm: Hamoumi et al, 1981;Robardet and Doré, 1988) overlain by postglacial shelf sandstones.…”
Section: Geological Settingmentioning
confidence: 99%
“…For pyroclastic surge deposits, the dune-migration direction and other flow directions will indicate radiating patterns from the vent location. In contrast, the geometry of water-lain deposits will generally be constrained by (Caroff et al 2009); b Pyroclastic base surge deposits at Cuesta del Plomo inferred from large-scale low-angle cross-beddings and/or planar-parallel beddings, and impact sags (Pardo et al 2008); c Large-scale antidune and plate-shaped scour channels, Laacher See Volcano, Germany (Liu et al 2008) drainage channels or basins; (4) special products. Pyroclastic bed sets are commonly capped by fine-ash fallout layers, often containing accretionary lapilli; (5) plant fragments in modern pyroclastic deposits.…”
Section: Large-scale Cross-bedding and Erosion Groovementioning
confidence: 99%