Sample 87-045

NavDat sample number 22305 · ANDESITE

Sample

Sample ID	87-045
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.3837
Longitude	-121.87
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	61.28		WT%	XRF
TIO2	1.38		WT%	XRF
AL2O3	15.78		WT%	XRF
FEO	8.06		WT%	XRF
MNO	0.17		WT%	XRF
MGO	2.06		WT%	XRF
CAO	4.58		WT%	XRF
NA2O	4.75		WT%	XRF
K2O	1.57		WT%	XRF
P2O5	0.37		WT%	XRF

References

Swanson, Donald A (1991) Geologic map of the Tower Rock Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1991.