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Geological Survey of Canada

Catalogue of Canadian volcanoes
Ember Ridge Northeast

Ember Ridge comprises eight discrete andesite lava masses arranged in a crescent between Mount Fee and Tricouni Peak in the south central Mount Cayley volcanic field (MCVF). These volcanoes consist of jagged to bulbous, steep-sided lava piles whose cooling joint orientations and minimal erosion indicate that their modern shapes approximate their original morphologies. They range in horizontal dimensions from 180 m to 1100 m and in thickness from 30 m to 140 m, and are almost ubiquitously flanked by volcanic scree (rubble). Five of these volcanoes were originally mapped as “Ember Ridge” by Souther (1980). A sixth (Ember Ridge Northeast) was identified during field work conducted in 2001 (Kelman et al., 2002; Kelman, 2005). The two lava masses at Mount Brew have not been studied in detail, but are morphologically and compositionally similar to the other Ember Ridge masses, and are probably similar in age and eruptive style. All eight masses represent eruptions from isolated point sources beneath ice, and likely involved eruptions into well-drained glacial ice cavities without significant penetration of the ice surface. Discounting the effects of erosion (which has been minimal) the volcano shapes and cooling joint characteristics at the Ember Ridge masses are due to some combination of lava flows exploiting the shapes of pre-existing cavities or fractures, eruption on steep or irregular surfaces, collapse of portions of domes during eruption to form breccias, and disruption of earlier-formed cooling units by later pulses of lava. The ages of the Ember Ridge volcanoes are not known precisely, but they were almost certainly erupted during the Fraser Glaciation (25,000-10,000 years ago), probably during its latter stages.

Ember Ridge Northeast drapes the end of a basement ridge and is the smallest of the eight Ember Ridge volcanoes. It consists of a single lava flow less than 40 m thick.

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Ember Ridge Northeast
Type of volcanic feature: Subglacial dome
Additional volcanic features:  
Region: British Columbia
Volcanic belt: Garibaldi volcanic belt
Area: Mount Cayley volcanic field
Latitude: 50°4'20" N
Longitude: 123°12'55" W
Age of last eruption: Pleistocene to Holocene (0.1-1.6 million years ago)
Summit elevation:  
Base elevation: