Sample 87-111

NavDat sample number 22302 · ANDESITE

Sample

Sample ID	87-111
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.405
Longitude	-121.846
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	59.59		WT%	XRF
TIO2	1.38		WT%	XRF
AL2O3	15.91		WT%	XRF
FEO	9.16		WT%	XRF
MNO	0.18		WT%	XRF
MGO	2.27		WT%	XRF
CAO	5.6		WT%	XRF
NA2O	3.82		WT%	XRF
K2O	1.53		WT%	XRF
P2O5	0.56		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.