Meager Creek Volcanic Complex, southwestern British Columbia

The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera

“…The upper Lillooet watershed (where the sample was collected) drains a hydrothermally active region with numerous documented hot and cold springs (Read, 1977). Thus it is possible that this water contains high concentrations of cations such as Li or Ba that are normally at low concentration were not measured.…”

The 6 August 2010 Mount Meager rock slide-debris flow, Coast Mountains, British Columbia: characteristics, dynamics, and implications for hazard and risk assessment

“…1). It is part of the MMVC, which consists of about 20 km 3 of volcanic rocks, ranging in age from Pliocene to Holocene (Read, 1978(Read, , 1990. The MMVC lies at the northern limit of the Cascade magmatic arc, which includes other prominent volcanoes in the Pacific Northwest such as Mounts Baker, Rainier, and St. Helens in Washington State, Mount Hood in Oregon, and Mount Shasta in California.…”

“…The oldest known eruption dates to approximately 2.2 Ma ago; the youngest eruption occurred about 2350 years ago (Clague et al, 1995) near the northeast flank of Plinth Peak, when a rhyodacitic welded ash tuff and lava flow blocked Lillooet River (Read, 1990;Stasiuk et al, 1996;Stewart 2002), and produced a pumiceous air fall deposit across part of southern British Columbia and into westernmost Alberta (Nasmith et al, 1967;Westgate and Dreimanis, 1967).…”

“…The MMVC consists of highly fractured, weak, and hydrothermally altered volcanic rocks (Read, 1990), the lowermost of which were assigned by Read (1978) to the Capricorn Formation, which comprises 200 m of porphyritic rhyodacite breccia and tuff, and 200 m of porphyritic rhyodacite flows. Above the Capricorn Formation and forming the steep summit flank is a porphyritic dacite plug of the Plinth Formation.…”

Magnetites from a new unidentified tephra source, Banff National Park, Alberta

“…A more recent ash identified in this area of the Canadian Rocky Mountains, St. Helens Y, emanated from an eruption at Mount St. Helens in southwestern Washington approximately 3350 years BP (Crandell et al 1962). The most recent ash, Bridge River, is thought to have originated from the Meager Mountain volcanic complex in the Coast Mountains north of Vancouver and west of Lillooet, British Columbia (Read 1977). Volcanic ashes from this eruptioil have been dated at approximately 2450 years BP (Nasmith et ul.…”