Abstract
Three U-Pb zircon ages of Ordovician volcanic rocks from northern New Brunswick are reported and related into a provisional stratigraphy for the internally imbricated and multiply folded Tetagouche Group. The 471 +5/-3 Ma feldspar-phyric dacites of the Spruce Lake Formation mark the base of the Tetagouche Group, deposited in a Japan Sea-type back-arc basin. Elsewhere in the basin deposition commenced with the calc-arenites and shales of the Vallée Lourdes Formation, which are immediately overlain by the ca. 472 Ma quartz-feldspar porphyries of the Nepisiguit Falls Formation. The association of these units to major massive sulphide deposits indicates that the economically significant syngenetic mineralization occurred early in the Tetagouche Group. The cessation of dominantly subalkalic felsic volcanism is marked by the top of the Flat Landing Brook Formation at 466 ± 2 Ma, after which the alkali basalts of the Boucher Brook Formation were formed.
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