CGRG Bibliography of Canadian Geomorphology
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Author : Bye, A.; Edwards, B.R.; and Hickson, C.J.
Date : 2000.
Title : Preliminary field, petrographic, and geochemical analysis of possible subglacial, dacitic volcanism at the Watts Point volcanic centre, southwestern British Columbia.
Publication : Geological Survey of Canada, Current Research 2000
Issue : A20.
Page(s) : 9 p.
Abstract
The Watts Point volcanic centre, located 40 km north of Vancouver, British Columbia, along the north shore of Howe Sound, is the southernmost volcanic centre in the Garibaldi segment of the Cascades volcanic arc. The Watts Point volcanic centre comprises approximately 0.02 km3 of sparsely porphyritic, highly jointed hornblende and pyroxene dacite lava and lava breccia. Lavas from the centre overlie the mid-Cretaceous Coast plutonic complex and are overlain locally by sediments and glacial till. The rocks are characterized by columnar joints, ranging in diameter from 5 cm to 40 cm and exhibiting locally radiating patterns. The distinctive, radial columnar joint patterns, the glassy to fine-grained groundmass, the stratigraphic relationships to overlying glacial till, as well as previously published geochronometric constraints support the formation of the Watts Point volcanic centre in a subglacial to englacial environment.
Bibliography of Canadian Geomorphology