Churchill, Mt reported activity

Event Name : Mt Churchill Dacite Flow

Start: 119000 (± 17000 Years)

Years BP K-Ar

Lava flow:

Eruption Type:	Effusive
Eruption Product:	dacite
Modal	Yes
Other	felsic

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."