Bedrock geology, Pond Inlet, Nunavut, part of NTS 38-B

Abstract

This map presents the field observations and initial geological interpretations for the Pond Inlet area (part of NTS 38-B), Baffin Island, Nunavut. The bedrock geology comprises Archean tonalitic to monzogranitic gneiss that includes minor mafic to intermediate components, and relatively homogeneous monzogranite-granodiorite intrusions. The Archean Mary River Group forms discontinuous volcano-sedimentary belts, consisting of mafic volcanic rocks interlayered with siliciclastic strata, banded iron-formation, and felsic to intermediate and ultramafic volcanic units. The supracrustal rocks are intruded by monzogranite-granodiorite plutons. Pre-Mesoproterozoic rocks record a complex structural history involving at least two regional deformation events and mineral assemblages indicate metamorphic conditions ranging from upper-greenschist to granulite facies. Mesoproterozoic clastic and carbonate platform sequences of the Bylot Supergroup unconformably overlie Archean units in the central part of northern Baffin Island. These strata were deposited within a graben that forms part of the larger Borden Basin.

Offshore bedrock geology of Eclipse Sound and Pond Inlet: connecting the structure and stratigraphy of Bylot and northern Baffin islands

“…Bylot and northeastern Baffin islands are underlain by upper amphibolite-to granulite-facies metaigneous and metasedimentary rocks Saumur et al 2018;Skipton et al 2018) of the ca. 3.0-2.5 Ga Committee Belt (Committee Fold Belt of Jackson and Taylor 1972) in the northeastern Rae Province (Hoffman 1989), or Rae Craton (St-Onge et al 2020).…”

“…Numerous approximately northeast-, north-, and west-trending minor faults have been mapped on Bylot Island and northern Skipton et al 2018;Saumur et al 2018) with shaded relief underlay and sea-floor bathymetry. Offshore faults have been identified using seismic, bathymetry, aeromagnetic data and published onshore geology maps.…”

“…Baffin Island Skipton et al 2018 nised on industry seismic sections from Lancaster Sound (Harrison et al 2011).…”

“…Dramatic changes in magnetic character can be attributed to faults where these changes are contiguous with faults mapped either onshore of offshore ( Fig. 8; Skipton et al 2018). Individual faults are discussed below under "Structure".…”

“…5) and (or) metavolcanic layering described by their unit sv). Interestingly, beneath Eclipse Sound, reflectors are present in unit A east of horsts 5 and 6 and onshore, ApPsu strata are preserved in the grabens immediately east of these horsts (Skipton et al 2018;Fig. 5).…”