Sample 90-020

NavDat sample number 57142 · BASALTIC-ANDESITE

Sample

Sample ID	90-020
Rock name	BASALTIC-ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.28
Longitude	-121.8
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	54.29		WT%	XRF
TIO2	1.95		WT%	XRF
AL2O3	16.53		WT%	XRF
FEO	9.9		WT%	XRF
MNO	0.16		WT%	XRF
MGO	3.92		WT%	XRF
CAO	8.42		WT%	XRF
NA2O	3.3		WT%	XRF
K2O	1.22		WT%	XRF
P2O5	0.32		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.