The Lac Cornu retrograded eclogites (Aiguilles Rouges massif, Western Alps, France): evidence of crustal origin and metasomatic alteration
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Cited by (43)
Deformation, crustal melting and magmatism in the crustal-scale East-Variscan Shear Zone (Aiguilles-Rouges and Mont-Blanc massifs, Western Alps)
2022, Journal of Structural GeologyCitation Excerpt :Two metamorphic events are distinguished. The first, related to collision and crustal thickening, consists of a mid-to high-pressure metamorphism recorded as garnet-kyanite bearing assemblage in micaschists and paragneisses, and as omphacite-bearing eclogitic assemblage within tholeiitic metamafic lenses (Von Raumer and Schwander, 1985; von Raumer and Bussy, 2004; Liégeois and Duchesne, 1981; Vanardois et al., 2022). High-pressure conditions have been estimated at 1.6–1.85 GPa and 680–750 °C for the Lac Cornu eclogites (Vanardois et al., 2022), and 1.3–1.5 GPa and 650–750 °C for the Val Bérard eclogites (Schulz and von Raumer, 1993, 2011) (see Fig. 1B for locations).
How many subductions in the Variscan orogeny? Insights from numerical models
2020, Geoscience FrontiersCitation Excerpt :Pre-Alpine HP metaophiolite remnants described in Helvetic to Austroalpine domains (e.g. Miller and Thöni, 1995; Guillot et al., 1998; Nussbaum et al., 1998; Spalla et al., 2014; Roda et al., 2019) indicate that segments of the Variscan suture zone, incorporating the records of oceanic lithosphere subduction, were included in the Alpine belt. Oldest ages of Variscan HP metamorphic imprints range from Silurian to Middle-Devonian (437–387 Ma) and HP-UHP rocks display ages up to Upper Missisipian (~330 Ma) (e.g. Liégeois and Duchesne, 1981; Latouche and Bogdanoff, 1987; Vivier et al., 1987; Paquette et al., 1989; Messiga et al., 1992; Guillot et al., 1998; von Raumer et al., 1999; Spalla and Marotta, 2007; Liati et al., 2009; Spalla et al., 2014) accounting for a long period characterised by transformation of metabasites into eclogites during oceanic subduction. The preserved witness of the oceanic crust is represented by the Chamrousse ophiolite, that escaped the HP conditions (Fréville et al., 2018 and refs. therein).
Depositional environment and tectonic implications of the Paleoproterozoic BIF in Changyi area, eastern North China Craton: Evidence from geochronology and geochemistry of the metamorphic wallrocks
2014, Ore Geology ReviewsCitation Excerpt :The volcanic features of the samples likewise may have been related to the poor sorting of the sediments sourced from igneous rocks. The (Ca + Mg) vs. (Al + Ti + Fe) diagram was mainly proposed to distinguish metamorphosed graywackes, mafic volcanics and calcareous graywackes (Moine and de La Roche, 1968), which has been proved effectively in identifying the protoliths of amphibolites (e.g., Liègeois and Duchesne, 1981; McElhaney and McSween, 1983; Moine and de La Roche, 1968). In this diagram, all the samples of the amphibolites fall into the volcanic field (Fig. 8b), suggesting their volcanic origin.
Reprint of "Depositional environment and tectonic implications of the Paleoproterozoic BIF in Changyi area, eastern North China Craton: Evidence from geochronology and geochemistry of the metamorphic wallrocks"
2014, Ore Geology ReviewsCitation Excerpt :The volcanic features of the samples likewise may have been related to the poor sorting of the sediments sourced from igneous rocks. The (Ca + Mg) vs. (Al + Ti + Fe) diagram was mainly proposed to distinguish metamorphosed graywackes, mafic volcanics and calcareous graywackes (Moine and de La Roche, 1968), which has been proved effectively in identifying the protoliths of amphibolites (e.g., Liègeois and Duchesne, 1981; McElhaney and McSween, 1983; Moine and de La Roche, 1968). In this diagram, all the samples of the amphibolites fall into the volcanic field (Fig. 8b), suggesting their volcanic origin.
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Present address: Centre Belge de Géochronologie, Musée Royal de l'Afrique Centrale, 1980 Tervuren (Belgium).