From oceanic closure to continental collision: A synthesis of the "Schistes lustrés" metamorphic complex of the Western Alps

Deville, É.; Fudral, Serge; Lagabrielle, Yves; Marthaler, Michel; Sartori, Mario

doi:10.1130/0016-7606(1992)104<0127:foctcc>2.3.co;2

Cited by 97 publications

(81 citation statements)

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“…2) composed of ultramafics, mafics and sediments such as radiolarites, ophicalcites (sedimentary breccias with serpentinite clasts and carbonate matrix) and calcschists (metamorphosed marls). This unit carries stratigraphic and metamorphic affinities with the blueschist-bearing "Schistes Lustrés" complex interpreted as the regional sedimentary cover associated with magmatic rocks and deposited in the Piemonte-Ligurian ocean prior to accretion [16,17]. Following initial oceanization, the Lago Nero-Replatte sedimentary succession has been inferred as recording an approach towards an accretionary wedge [18].…”

Section: Geological Settingmentioning

confidence: 99%

Alpine ocean seafloor spreading and onset of pelagic sedimentation: new radiolarian data from the Chenaillet-Montgenèvre ophiolite (French-Italian Alps)

Cordey

Bailly

2007

Geodinamica Acta

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Radiolarians of Middle Jurassic age (tentatively middle Bathonian) provide the first direct age determination from oceanic sediments associated with the Chenaillet-Montgenèvre ophiolite (Piemonte zone, French-Italian Alps). This datum obtained from radiolarites of the Lago NeroReplatte thrust sheet is older than those previously established on ophiolite sedimentary covers from this segment of the western Alps. It also shows that Lago Nero-Replatte basal radiolarites are anterior to the youngest intrusives from the overlying Chenaillet s.s. thrust sheet. This chronological relationship implies either a late seafloor spreading-related magmatic activity in places younger than adjacent initial pelagic sedimentation, or more likely that the Lago Nero-Replatte and the Chenaillet s.s. thrust sheets are distinct and distant pieces of lithosphere that were eventually stacked together: the Lago Nero-Replatte unit was trapped within the accretionary wedge while the Chenaillet s.s., of a younger age and in a more distal position with regards to the European margin, was obducted. Regionally, the Lago Nero-Replatte sediments appear to be coeval to other Bathonian supraophiolitic radiolarites exposed in the western Alps. These results strengthen the Bathonian correlation of widespread seafloor spreading in both western Tethys and the central Atlantic ocean.

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Section: Geological Settingmentioning

confidence: 99%

Alpine ocean seafloor spreading and onset of pelagic sedimentation: new radiolarian data from the Chenaillet-Montgenèvre ophiolite (French-Italian Alps)

Cordey

Bailly

2007

Geodinamica Acta

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“…Based on correlations with other sections of the Western Alps (see the synthesis paper by Deville et al, 1992), and comparison with the unmetamorphosed stratigraphic sequences in the Northern Apennines (e.g. Abbate et al, 1980;Marroni et al, 1992), we suggest that the Saint-Marcel sediments were deposited in different environments during at least three main diachronous events.…”

Section: Discussionmentioning

confidence: 99%

“…These rocks although completely devoid of ophiolitic detrital material, likely correspond to the metaflysch series occurring on top of the Schistes Lustrés nappe of the French-Italian Alps (see Deville et al, 1992), and possibly to the 'Flysch a Helmintoides' formation in the Apennines dated Upper Cretaceous (e.g. Decandia & Elter, 1972).…”

Section: Discussionmentioning

confidence: 99%

“…Abbate, Bortolotti, & Principi, 1980;Decandia & Elter, 1972) whose age ranges from Late Jurassic to Palaeocene (Chiari, Marcucci, & Principi, 2000; Marroni, Monechi, Perilli, Principi, & Treves, 1992 and references therein). By analogy, the supra-ophiolitic sedimentary sequences described in the Schistes Lustrés of the Cottian Alps have been attributed to a similar time range (Lemoine, 1971;Polino & Lemoine, 1984; see review in Deville et al, 1992).…”

Section: Key-sections Lithostratigraphymentioning

confidence: 99%

“…Deville, Fudral, Lagabrielle, Marthaler, & Sartori, 1992;Dewey, Pitman, Ryan, & Bonnin, 1973;Laubscher, 1971;Martin, Tartarotti, & Dal Piaz, 1994;Polino et al, 1990). It consists of the Zermatt-Saas and the Combin units, which were defined in Switzerland and in the northern Aosta Valley on the base of the rock assemblage and metamorphism (e.g.…”

Section: Western Alps Metaophiolitesmentioning

confidence: 99%

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Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy)

Tartarotti

Martin

Monopoli³

et al. 2017

Journal of Maps

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The geological map of the Saint-Marcel valley at the scale of 1:20,000 illustrates the tectonic setting of metaophiolites from the southern Aosta Valley, in the Italian side of the Western Alpine belt. The map highlights the sharp contact between the metaophiolitic basement and its metasedimentary cover, which mainly consists of quartzites, marbles, and calcschists. In spite of the Alpine tectonics, this contact is regarded as deriving from the original oceanic crust/sediments interface. Metaophiolites mostly consist of metabasalts hosting Fe-Cu sulphide mineralisations, characterised by high-pressure metamorphic imprint. These rocks likely represent the shallowest portion of the Tethyan oceanic lithosphere created near the axis of the slow-spreading ridge where hydrothermal fluid circulation was active. Selected key-sections through metasediments reveal a consistent internal lithostratigraphy, in spite of the pervasive metamorphic and tectonic reworking acting during the Alpine evolution. Metasediments reflect various sedimentation episodes starting from pelagic and proximal settings to the onset of the orogenic stage. The Saint-Marcel valley metasediments thus reflect a changing in the sedimentation environments through time and space during the overall geologic evolution. ARTICLE HISTORY

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