Sample 91

NavDat sample number 88011 · ANDESITE

Sample

Sample ID	91
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Collected by	Hildreth and others
Comment	Lava-flow remnant

Location

Latitude	48.8157
Longitude	-121.943
Location	Lookout Mountain
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.859		0.845	0.873

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	59.8		WT%	XRF
K2O	1.619		WT%	XRF

References

Hildreth, Wes; Lanphere, Marvin A; Champion, Duane E; Fierstein, Judy (2004) Rhyodacites of Kulshan Caldera, north Cascades of Washington;post-caldera lavas that span the Jaramillo. Journal of Volcanology and Geothermal Research, vol.130, no.3-4,pp.227-264, 29 Feb 2004 doi:10.1016/S0377-0273(03)00290-7