Palaeozoic granitoids from the French Massif Central: age and origin studied by 87Rb-87Sr system

Details Palaeozoic granitoids from the French Massif Central: age and origin studied by 87Rb-87Sr system Palaeozoic granitoids from the French Massif Central: age and origin studied by 87Rb-87Sr system

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...35..131d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 35, Issue 1-3, p. 131-144.

Physics

32

Scientific paper

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.

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