Uranium-lead geochronology of Middle River rhyolite: implications for the provenance of basement rocks of the Bathurst mining camp, New Brunswick; Radiogenic Age and Isotopic Studies: Report 15

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Abstract

Thermal ionization mass spectrometry (TIMS) and sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dating techniques were employed in this study to obtain the crystallization age and ages of xenocrystic zircon from a sample of the Middle River rhyolite of the Bathurst mining camp, New Brunswick. A crystallization age of 479 " 6Ma constrains the timing of initial volcanism and refines the age of the boundary between the Tetagouche and Miramichi groups. Ages of xenocrystic zircon from Middle River rhyolite and synvolcanic Ordovician plutons range from Cambrian to Archean and indicate a Gondwanan, as opposed to a Laurentian, basement.

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