U-Pb dating of the Musquodoboit Batholith, southern Nova Scotia: evidence for a protracted magmatic-hydrothermal event in a Devonian intrusion.

Atlantic Geology | July 1, 2004| | Copyright

ABSTRACT

The 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. Previous geochronology includes [sup.40]Ar/[sup.39]Ar mica (i.e., muscovite and biotite, 363 to 370 Ma) and Rb-Sr whole-rock (266 Ma) and mineral (biotite, 370 Ma) ages. These earlier ages contrast with new data for zircon and monazite which together define an age of 378 [+ or -] 1 Ma for the high-temperature crystallization (i.e., ca. >650-800[degrees]C) and, therefore, ...

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