Lithostratigraphic setting of diagenetic, isotopic, and geochemistry studies of Ibexian and Whiterockian carbonate rocks of the St. George and Table Head groups, western Newfoundland

Azmy, Karem and Knight, I. (Ian) and Greene, Michael G. and Lavoie, Denis (2007) Lithostratigraphic setting of diagenetic, isotopic, and geochemistry studies of Ibexian and Whiterockian carbonate rocks of the St. George and Table Head groups, western Newfoundland. Technical Report. Government of Newfoundland and Labrador, St. John's, Newfoundland.

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Abstract

Diagenetic, isotopic and geochemical studies of Ibexian and Whiterockian carbonate rocks of the St. George and Table Head groups in western Newfoundland, are ongoing. This article summarizes the lithostratigraphy that plays host to the succession of shallow-shelf carbonates examined in shoreline sections near Port au Choix, and drill cores from Port au Choix and the Port au Port peninsulas. Ibexian to Whiterockian carbonate rocks of the upper St. George Group form a disconformity-bounded, third-order onlapofflap sequence; this being the last sequence to be deposited on the passive margin of Laurentia (in Newfoundland). Rocks of the Table Head Group preserve Whiterockian carbonate shelf deposits of the succeeding Anticosti foreland basin. The transition between the sequences is marked by the St. George Unconformity, an erosional karst unconformity fashioned by the dynamic interplay of Taconic orogenesis and eustatic sea-level fluctuation upon the local paleo-geography. The dolomitization of significant parts of the sequence is described within the context of the regional lithostratigraphy, and some geochemical, petrographic and isotopic results are summarized and presented here.

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