Sample 90-016

NavDat sample number 57211 · RHYOLITE

Sample

Sample ID	90-016
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.313
Longitude	-121.788
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
30		24	36

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	75.27		WT%	XRF
TIO2	0.2		WT%	XRF
AL2O3	14.2		WT%	XRF
FEO	2.12		WT%	XRF
MNO	0.02		WT%	XRF
MGO	0.52		WT%	XRF
CAO	5.92		WT%	XRF
NA2O	1.3		WT%	XRF
K2O	0.41		WT%	XRF
P2O5	0.06		WT%	XRF

References

Swanson, Donald A (1992) Geologic map of the McCoy Peak Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1992.