Coasts of Foxe Basin, Arctic Canada

Abstract

AbstractFoxe Basin is a down-faulted arctic basin floored by Palaeozoic carbonates, surrounded by metamorphic Precambrian terrains. Quaternary deposits consist of Pleistocene–Holocene glacial drift, and frost-shattered bedrock-clasts mostly reworked by sea waves during post-glacial emergence during the last 5000–6000 yr. The shallow, primarily micro- to meso-tidal sea is covered by ice for c. 9–10 months each year. This ensures that the overall energy of the coasts is low, although strong storm waves develop during ice-free periods. Puccinellia phryganodes dominated salt marshes occur on muddy and sandy shores and grade into inland sedge-forb wetlands and Dryas-dominated tundra. Cold climate processes active on the emerged land have generated typical features such as frost heaving of bedrock blocks, solifluction lobes on slopes, frost boils in flatter areas, frost shattering and solution of surficial carbonate pebbles, thermokarst lakes, and shallow Cryosols.