Sample 87-030

NavDat sample number 55932 · ANDESITE

Sample

Sample ID	87-030
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.404
Longitude	-121.947
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
28		24	33

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	57.37		WT%	XRF
TIO2	1.25		WT%	XRF
AL2O3	17.31		WT%	XRF
FEO	7.91		WT%	XRF
MNO	0.11		WT%	XRF
MGO	3.38		WT%	XRF
CAO	7.56		WT%	XRF
NA2O	3.48		WT%	XRF
K2O	1.41		WT%	XRF
P2O5	0.2		WT%	XRF

References

Swanson, Donald A (1989) Geologic maps of the French Butte and Greenhorn Buttes quadrangles, Washington. Open-File Report - U. S. Geological Survey. 1989.