Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Heart Peaks

stripes

Occurrence number: 
031-00-200
Country: 
Canada
Region: 
British Columbia
Location: 
Longitude: -131.96, Latitude: 58.59
Carbonatite: 
No

Heart Peaks of British Columbia, Canada is a shield volcano belonging to the Northern Cordilleran Volcanic Province. The volcanic centre reaches a maximum elevation of 2012 m, consisting of a flat-topped plateau of mafic lava flows covering an area of ~275 km2, with acid volcanics located on the western side. The extrusives of the plateau belong to two groups: the sub-alkaline Hearts Peaks Formation consisting of rhyolite and trachyte, and the alkaline Level Mountain Group consisting of alkali olivine basalts, hawaiites, and potassic trachybasalts. Some alkali basalts are nepheline-normative, and some contain xenoliths of alkali-diorite. Geochemical data, including major and trace element analysis, Sr and O isotope data and petrographic details can be found in Casey (1980).

Age: 
Neogene to Holocene (?) (Edwards & Russell, 2000)
References: 
CASEY, J.J., 1980. Geology of the Heart Peaks Volcanic Centre, Northwestern British Columbia. Masters thesis, University of Alberta. EDWARDS, B.R. & RUSSELL, J.K., 2000. Distribution, nature, and origin of Neogene-Quarternary magmatism in the north Cordilleran volcanic province, Canada. Bulletin of the Geological Society of America 112 (8) 1280-1295
Fig 1. Map of the Heart Peaks Plateau (Casey, 1980, Fig 4.)
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith