Sample 92-031

NavDat sample number 57518 · RHYOLITE

Sample

Sample ID	92-031
Rock name	RHYOLITE
Rock type	PLUTONIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.3335
Longitude	-121.694
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
18		12	25

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	75.7		WT%	XRF
TIO2	0.12		WT%	XRF
AL2O3	14.45		WT%	XRF
FEO	1.26		WT%	XRF
MNO	0.04		WT%	XRF
MGO	0.25		WT%	XRF
CAO	0.34		WT%	XRF
NA2O	4.74		WT%	XRF
K2O	3.02		WT%	XRF
P2O5	0.08		WT%	XRF

References

Swanson, Donald A (1994) Geologic map of the East Canyon Ridge Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1994.