Sample 85-075

NavDat sample number 57512 · RHYOLITE

Sample

Sample ID	85-075
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.2745
Longitude	-121.64
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
20		15	25

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	70.75		WT%	XRF
TIO2	0.51		WT%	XRF
AL2O3	15.25		WT%	XRF
FEO	3.3		WT%	XRF
MNO	0.03		WT%	XRF
MGO	0.17		WT%	XRF
CAO	2.25		WT%	XRF
NA2O	4.65		WT%	XRF
K2O	2.94		WT%	XRF
P2O5	0.15		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.