Stratigraphy, Sedimentology, and Diagenesis of Ordovician Outliers, Northern Ottawa–Bonnechere Graben, Central Ontario
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Several Ordovician outliers along or near the northern Ottawa-Bonnechere graben are bounded by Precambrian rocks of the Canadian Shield; however, they are remnants of a once expansive Late Ordovician phase of the St. Lawrence Platform extending into the craton interior. Integrating litho-, bio-, and chemostratigraphic evidence, four outliers (Deux Rivières, Brent Crater, Cedar Lake, and Manitou Islands) preserve Turinian strata, whereas Owen Quarry outlier preserves lower Chatfieldian strata. Each outlier documents a unique depositional succession but commonly records shallow-water depositional environments during net transgression. Limestone diagenesis occurs in the surface marine, shallow-burial, and deep-burial zones. Dolomite shows basement-related, stratabound, and fault/fracture-related spatial distributions. Combining petrological and isotopic (C, O, Sr) evidence, early-stage dolomitization may be related to Mg derived from marine or meteoric waters whereas late-stage dolomitization, including hydrothermal saddle dolomite, likely involves brines that migrated along Paleozoic-Precambrian boundary, then refocused along vertical faults and fractures.
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Copyright © 2018 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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