Download PDF by Richard Simon D'Lemos: The Cadomian orogeny

Download PDF by Richard Simon D'Lemos: The Cadomian orogeny

By Richard Simon D'Lemos

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667 Ma and 656 Ma obtained for granodiorite boulders from a Brioverian conglomerate are the oldest known dates which may relate to the Cadomian orogeny, and imply an early cycle of uplift, erosion and sedimentation before major plutonism around 590 Ma. Two main phases of evolution are recognized. The first one, probably related to an active margin, is characterized by the emplacement of granodiorites at 670-660 Ma, 645 Ma and 615 Ma ago followed by basic magmatism at 600 Ma in a back-arc environment.

In: D'LEMOS, R. , STRACHAN, R. A. & TOPLEY, C. G. (eds) The Cadomian Orogeny. Geological Society, London, Special Publication, 51, 181213. BRUN, J. P. 1975. Contribution à l'étude d'un dôme gneissique: Le Massif de St Malo (Massif Armoricain). Analyse de la deformation. Thèse 3e cycle, Université de Rennes. 1977. La zonation structurale des dômes gneissique. Un example: le Massif de St Malo (Massif Armoricain, France). Canadian Journal of Earth Sciences, 14, 16971707. & BALE, P. 1990. Cadomian tectonics in Northern Brittany.

SONET, J. & ZIMMERMANN, J. L. 1968. Géochronologie et evolution orogenique précambrienne et hercynienne de la partie nord-est du Massif Armoricain. Sciences de la Terre, Memoire, 11, Nancy. , ROACH, R. A. & SONET, J. 1973. Quelques résultats obtenus des roches d'age précambrien du Cotentin. Compte rendus de L'Academie des Sciences. 21212124. PASTEELS, P. & DORE, F. 1982. Age of the VireCarolles granite. In: ODIN, G. S. ) Numerical Dating in Stratigraphy, Part II, John Wiley & Sons, New York. 784790.

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