Investigating the onshore-to-offshore structure and stratigraphy of the carboniferous Bay St. George subbasin, Western Newfoundland

Shano, Miguel (2022) Investigating the onshore-to-offshore structure and stratigraphy of the carboniferous Bay St. George subbasin, Western Newfoundland. Masters thesis, Memorial University of Newfoundland.

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Abstract

The Bay St. George subbasin is a geologically complex onshore-to-offshore basin that has undergone significant deformation during Appalachian orogenesis. Despite this complex tectonic history, few studies have investigated the crustal inheritance and correlated the geology from the onshore-to-offshore. The main objective of this study is to use high-resolution geophysical data, including seismic, well log, and potential field data to investigate the structure and stratigraphy of the basin. This study reveals significant subsurface compartmentalization reaching crustal-scale depths. A new 3-D gravity inversion and seismic interpretation provide evidence of juxtaposed lower crustal blocks caused by regional faults in the basin and broader Northern Appalachians. Based on the timing and structural characteristics of these regional faults, the Bay St. George subbasin has a history that involves both transtension and transpression.

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