Sample 90-074

NavDat sample number 57146 · ANDESITE

Sample

Sample ID	90-074
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.3192
Longitude	-121.817
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	57.6		WT%	XRF
TIO2	1.69		WT%	XRF
AL2O3	16.38		WT%	XRF
FEO	8.74		WT%	XRF
MNO	0.17		WT%	XRF
MGO	3.05		WT%	XRF
CAO	6.72		WT%	XRF
NA2O	4.25		WT%	XRF
K2O	1.11		WT%	XRF
P2O5	0.28		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.