Sample 91-024

NavDat sample number 36903 · ANDESITE

Sample

Sample ID	91-024
Rock name	ANDESITE
Rock type	PLUTONIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.4075
Longitude	-121.623
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
25		18	33

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	57.1		WT%	XRF
TIO2	1.18		WT%	XRF
AL2O3	16.61		WT%	XRF
FEO	8.45		WT%	XRF
MNO	0.15		WT%	XRF
MGO	3.89		WT%	XRF
CAO	6.86		WT%	XRF
NA2O	4.09		WT%	XRF
K2O	1.44		WT%	XRF
P2O5	0.24		WT%	XRF

References

Swanson, Donald A (1996) Geologic map of the Hamilton Buttes Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1996.