Mt Churchill Dacite Flow
Start: 119000 yBP ± 17000 Years [1]
Event Type: Effusive
Description: From Richter and others (1995): "The exception to the tephra occurrences along the south-east ridge [of Mount Churchill summit area] is an outcrop of flow-banded dacite ([sample number] 90ADg-3) that underlies the tephra. The dacite is a pyroxene-bearing, hornblende dacite, mineralogically distinct from the tephra (see modes, Table 1 [in original text]). Plagioclase from the dacite yielded a K/Ar age of 119 +/- 17 ka (N. Shew, written communication, 1991), indicating that Mount Churchill has been active at least since the Late Pleistocene."
References Cited
[1] Mount Churchill, Alaska: source of the late Holocene White River Ash, 1995
Richter, D. H., Preece, S. J., McGimsey, R. G., and Westgate, J. A., 1995, Mount Churchill, Alaska: source of the late Holocene White River Ash: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 32, n. 6, p. 741-748.[2] Chemical complexity and source of the White River Ash, Alaska and Yukon, 2014
Preece, S.J., McGimsey, R.G., Westgate, J.A., Pearce, N.J.G., Hart, W.K., and Perkins, W.T., 2014, Chemical complexity and source of the White River Ash, Alaska and Yukon: Geosphere, v. 10, n.5., p. 1020-1042, doi: 10.1130/GES00953.1Complete Eruption References
Chemical complexity and source of the White River Ash, Alaska and Yukon, 2014
Preece, S.J., McGimsey, R.G., Westgate, J.A., Pearce, N.J.G., Hart, W.K., and Perkins, W.T., 2014, Chemical complexity and source of the White River Ash, Alaska and Yukon: Geosphere, v. 10, n.5., p. 1020-1042, doi: 10.1130/GES00953.1
Mount Churchill, Alaska: source of the late Holocene White River Ash, 1995
Richter, D. H., Preece, S. J., McGimsey, R. G., and Westgate, J. A., 1995, Mount Churchill, Alaska: source of the late Holocene White River Ash: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 32, n. 6, p. 741-748.
