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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Cassiar Mountains (1)
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Western Canada
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British Columbia (1)
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Central America
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Guatemala (1)
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Europe
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geochronology (1)
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igneous rocks
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volcanic rocks
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metasomatism (2)
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Pacific Ocean
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North Pacific
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Mariana Trench (1)
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West Pacific
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Northwest Pacific
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Mariana Trench (1)
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sediments
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A 500 ka record of volcanism and paleoenvironment in the northern Garibaldi Volcanic Belt, British Columbia
ABSTRACT The Tuya-Kawdy region of northern British Columbia is well established as a place where glaciation and volcanism overlapped in space. However, no modern work has integrated observations from the region’s volcanic and glacial deposits with geochronologic constraints to summarize how they might overlap in time. Here, we provide a general overview of such characteristics and 23 new 40 Ar/ 39 Ar eruption ages of glaciovolcanic deposits ranging from 4.3 Ma to 63 ka to constrain the timing, location, and minimum thicknesses and distributions of coincident ice. Subaerial lava fields interspersed with glaciovolcanism record periods of ice-sheet absence in presumably warmer climate conditions. These generally coincide with interglacial marine isotope stages. Many of the volcanoes have a secondary record of posteruption glacial modification, cirques, erratics, and mega-lineations, which document later climate changes up to the present. We used edifice-based terrain analysis to reconstruct changes to local minimum Cordilleran ice-sheet thicknesses, extents, and flow directions at specific locations and times during the late Pliocene and the Pleistocene.