| Tennena Cone | |
|---|---|
| Icebridge Cone | |
 Tennena Cone from the northwest | |
| Highest point | |
| Elevation | 2,390 m (7,840 ft)[1] |
| Coordinates | 57°41′03″N 130°39′44″W / 57.68417°N 130.66222°W[2] |
| Dimensions | |
| Length | 1,200 m (3,900 ft)[1] |
| Width | 600 m (2,000 ft)[1] |
| Naming | |
| Etymology | Combination of the Tahltan words ten and nena[2] |
| English translation | Icebridge[2] |
| Geography | |
  Tennena Cone Location in British Columbia | |
 | |
| Location in Mount Edziza Provincial Park | |
| Country | Canada[3] |
| Province | British Columbia[3] |
| District | Cassiar Land District[2] |
| Protected area | Mount Edziza Provincial Park[2] |
| Parent range | Tahltan Highland[2][4] |
| Topo map | NTS 104G10 Mount Edziza[2] |
| Geology | |
| Mountain type | Subglacial mound[5] |
| Rock type | Alkali basalt[6] |
| Volcanic region | Northern Cordilleran Province[7] |
| Last eruption | Pleistocene or Holocene age[5][8] |
Tennena Cone, alternatively Icebridge Cone, is a small volcanic cone in Cassiar Land District of northwestern British Columbia, Canada. It has an elevation of 2,390 metres (7,840 feet) and lies on the western flank of Ice Peak, the prominent south peak of Mount Edziza. The cone is almost completely surrounded by glacial ice of Mount Edziza's ice cap which covers an area of around 70 square kilometres (27 square miles). Tennena Cone is 200 metres (660 feet) high, 1,200 metres (3,900 feet) long and up to 600 metres (2,000 feet) wide, its symmetrical structure resembling a black pyramid. The cone and the surrounding area are in Mount Edziza Provincial Park which also includes the Spectrum Range to the south.
Tennena Cone is part of the Mount Edziza volcanic complex, a group of overlapping volcanoes that have formed over the last 7.5 million years. It overlies four geological formations of this volcanic complex that formed during the Miocene, Pliocene and Pleistocene epochs, all of which consist of several types of volcanic rocks. Tennena Cone consists of alkali basalt pillow lavas, tuff breccias and lapilli tuffs of the younger Big Raven Formation which were deposited by a small eruption under glacial ice. The exact timing of this eruption is unknown but radiometric dating of volcanic rocks from Tennena Cone has yielded ages as old as 0.011 ± 0.033 million years.
- ^ a b c Hungerford et al. 2014, p. 41.
- ^ a b c d e f g "Tennena Cone". BC Geographical Names. Archived from the original on 2024-06-08. Retrieved 2024-07-03.
- ^ a b Hungerford et al. 2014, p. 39.
- ^ "A 502" (Topographic map). Telegraph Creek, Cassiar Land District, British Columbia (3 ed.). 1:250,000. 104 G (in English and French). Department of Energy, Mines and Resources. 1989. Archived from the original on 2021-05-02. Retrieved 2021-09-25.
- ^ a b "Tennena Cone". Catalogue of Canadian volcanoes. Natural Resources Canada. 2009-03-10. Archived from the original on 2010-12-11. Retrieved 2024-07-03.
- ^ Souther, J. G. (1988). "1623A" (Geologic map). Geology, Mount Edziza Volcanic Complex, British Columbia. 1:50,000. Cartography by M. Sigouin, Geological Survey of Canada. Energy, Mines and Resources Canada. doi:10.4095/133498.
- ^ Hungerford et al. 2014, p. 40.
- ^ Hungerford et al. 2014, pp. 39, 41.