Sample 87-072

NavDat sample number 57163 · ANDESITE

Sample

Sample ID	87-072
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.271
Longitude	-121.859
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
19		18	21

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	61.45		WT%	XRF
TIO2	1.25		WT%	XRF
AL2O3	16.21		WT%	XRF
FEO	7.43		WT%	XRF
MNO	0.15		WT%	XRF
MGO	2.46		WT%	XRF
CAO	5.13		WT%	XRF
NA2O	4.41		WT%	XRF
K2O	1.17		WT%	XRF
P2O5	0.33		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.