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Ellesmere Island

Island of the Arctic Archipelago in Nunavut, Canada

  • 21 min read
  • 6 chapters
River Beauty flowers ( Chamerion latifolium ) in foreground, with meltwater stream and Ekblaw Lake in background. Quttinirpaaq National Park. July 2011.
Paul Gierszewski · CC BY-SA 3.0

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Geology

Ellesmere Island has three major geological regions. The Grant Land Highlands is a large belt of fold mountains which dominate the northern face of the island. It is part of the Franklinian mobile belt, a zone of volcanic and intrusive rock from the Cretaceous. South of this is the Greely-Hazen Plateau, a large tableland composed of sedimentary and volcanic rocks. Covering most of the island, the coastal sedimentary plateau is a succession of highly eroded sedimentary peaks which are part of the Franklinian Shield with an extension of the Canadian Shield (Igneous and metamorphic rocks from the Precambrian) in the island's southeastern corner. In addition, there are syntectonic clastics which comprise the Ellesmere Island Volcanics of the Sverdrup Basin Magmatic Province. A period of uplift and faulting prior to the Pleistocene epoch (>2.6 Ma) established the overall features of the island. Additional uplift occurred due to isostatic rebound following the Last Glacial Period. Land features were then shaped by erosion from glacial ice, meltwaters, and scouring by sea ice.

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