Sample 91-022

NavDat sample number 36908 · ANDESITE

Sample

Sample ID	91-022
Rock name	ANDESITE
Rock type	PLUTONIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.458
Longitude	-121.551
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
26		19	33

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	59.01		WT%	XRF
TIO2	1.24		WT%	XRF
AL2O3	17.16		WT%	XRF
FEO	7.69		WT%	XRF
MNO	0.14		WT%	XRF
MGO	2.53		WT%	XRF
CAO	6.5		WT%	XRF
NA2O	3.86		WT%	XRF
K2O	1.57		WT%	XRF
P2O5	0.31		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.