Abstract
Emerged Holocene coalescing glaciomarine fans are exposed along the Nastapoka Hills, eastern Hudson Bay. The fans form part of a regional, stratified drift belt associated with terrestrial and submarine frontal moraines and other grounding lines deposits. These thick, extensive and, in many cases, coalescent sediment bodies were deposited during a stillstand of the Québec–Labrador Sector (QLS) of the Laurentide Ice Sheet (LIS) that pinned on the hills during eastward retreat from Hudson Bay. The fans are composed of basal interbedded and interlaminated sand, silt and silty clay (Facies association I, FA I) deposited by suspension settling from overflow plumes, sediment gravity flows and ice rafting. Towards the ice-contact zone, FA I interfingers with diamict layers (FA II) deposited by gravity flows and ice rafting. These two sedimentary units are overlain by interbedded sand and gravel (FA III), formed by reworking during subsequent emergence. Parts of FA I and FA II were remobilized by submarine gravity flows, which prevailed long after ice retreat. The sedimentology of the Nastapoka Hills provides information on the processes operating near the grounding line of a temperate ice sheet reaching tidewater.
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