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- W2068651366 abstract "According to geochronological results, granitoids of the French Massif Central fall into two main chronological groups: (1) a Cambro-Silurian group (545-410 Ma) occurring all over the Massif Central, later metamorphosed into orthogneisses during the Devonian metamorphism (400-370 Ma). (2) An Upper Devonian-Carboniferous group (360-280 Ma) including non or weakly deformed granites, the oldest (360-340 Ma) localized in the north of the Massif Central, and the youngest (340-285 Ma) outcropping all over the massif. Geochemistry of Rb, Sr and isotopic evolution diagram give the following results: Strontium initial ratios for orthogneisses increase with time from 0.704 (545 Ma) to 0.710 (410 Ma), excluding a purely mantellic origin of the magmas. Strontium initial ratios for granites show that their magmas cannot result from a remelting of orthogneisses. The isotopic evolution of the leucogranitic family defines a trend originating ∼ 370 Ma, i.e., during the main metamorphic phase. The source rocks of the early Palaeozoic granitoids contain old zircons (1.5–2.0 Ga). Probably originating from an earlier continental crust, but the evidence of this crust is not pointed out by strontium isotopes." @default.
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- W2068651366 date "1984-10-01" @default.
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- W2068651366 title "Palaeozoic granitoids from the French Massif Central: age and origin studied by 87Rb87Sr system" @default.
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- W2068651366 doi "https://doi.org/10.1016/0031-9201(84)90039-6" @default.
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