On Batholiths and VolcanoesIntrusion and Eruption of Late Cenozoic Magmas in the Glacier Peak Area, North Cascades, Washington
Tabor RW and Crowder DF. 1969. On Batholiths and VolcanoesIntrusion and Eruption of Late Cenozoic Magmas in the Glacier Peak Area, North Cascades, Washington. U.S. Geological Survey (USGS) Professional Paper. 604. US Geological Survey. Washington, D.C.
Description of the Cloudy Pass batholith, the overlying Gamma Ridge volcanic rocks, and the stillyounger Glacier Peak volcano with discussion of the source magmas', their genetic ties, and the structures controlling their emplacement and eruption. In the Glacier Peak area, itihe three principal episodes of Cenozoic igneous activity have been the intrusion of the tonalite- granodiorite Cloudy Pass batholith in early Miocene time, as shown by potassium-argon radiometric dates of 22 ni.y. (million years) ; the extrusion on and near the exposed batholith of a thick pile of predominantly andesitic to dacitic breccia, tuff, and lava of Gamma Ridge between early Miocene and Pleistocene time; and, in late Pleistocene and Recent time, the growth of the dacitic Glacier Peak volcano, which was accompanied by eruption of small amounts of basalt from separate vents near Glacier Peak.
- Type
- Published Report
- Authors
- Tabor, R.; Crowder, D.
- Date of Issue
- 1969
- Publisher
- US Geological Survey
- Units
- HIST , NOCA
- Keywords
- Batholiths, Cloudy Pass, ehistory, Eruption, Geologic Setting, Geology, History, Intrusion, Lithology, Mineralogy, Petrology, Structure and contact relations, Volcanoes