Sample 87-022

NavDat sample number 55938 · ANDESITE

Sample

Sample ID	87-022
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.3873
Longitude	-121.994
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	59.34		WT%	XRF
TIO2	1.66		WT%	XRF
AL2O3	16.17		WT%	XRF
FEO	8.1		WT%	XRF
MNO	0.16		WT%	XRF
MGO	2.56		WT%	XRF
CAO	6		WT%	XRF
NA2O	4.19		WT%	XRF
K2O	1.29		WT%	XRF
P2O5	0.53		WT%	XRF

References

Swanson, Donald A (1989) Geologic maps of the French Butte and Greenhorn Buttes quadrangles, Washington. Open-File Report - U. S. Geological Survey. 1989.