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muscovite et biotite, de 363 à 370 Ma), une datation Rb-Sr de roche totale (266 Ma) et une datation minérale (biotite, 370 Ma).

Ces âges plus précoces contrastent avec les nouvelles données du zircon et de la monazite, qui confèrent ensemble un âge de 378 ± 1 Ma par cristallisation à haute température (c.-à-d.

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ABSTRACTThe first high-temperature geochronometric data are presented for the peraluminous, multiple phase Musquodoboit Batholith, the second largest intrusion in the Meguma terrane of Nova Scotia.

In this paper, we present the first high-temperature (i.e., Ar mica ages, which provide the time of cooling through 350– 300°C, that being the time at which argon diffusion in mica ceases (Mc Dougall and Harrison 1988). Radioelement mapping of parts of the Musquodoboit Batholith and Liscomb Complex, Meguma Zone, Nova Scotia. RÉSUMÉLes premières données géochronométriques à haute température visent le batholite hyperalumineux à phases multiples de Musquodoboit, deuxième intrusion en importance dans le terrane de Meguma, en Nouvelle-Écosse. Les données géochronologiques antérieures comprennent des datations Ar de mica (c.-à-d. ≥ 3– 4 kilobars).[ Granite batholiths form a large part of tectonic terranes (e.g., Cordillera of North and South America, Appalachian Orogen) and, therefore, constitute an important part of their geological history. Consequently, it is important to document precisely the age of intrusion and longevity of the magmatism and related hydrothermal systems in order to understand the geological evolution of areas underlain by these intrusions. 10 à 12 kilomètres) et du gradient géothermique potentiellement élevé en raison de la nature riche en radioéléments de certaines parties du complexe.

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