Sample 86-042

NavDat sample number 55911 · DACITE

Sample

Sample ID	86-042
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.3375
Longitude	-121.979
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	69.3		WT%	XRF
TIO2	0.48		WT%	XRF
AL2O3	15.69		WT%	XRF
FEO	3.34		WT%	XRF
MNO	0.06		WT%	XRF
MGO	1.37		WT%	XRF
CAO	3.15		WT%	XRF
NA2O	3.31		WT%	XRF
K2O	3.19		WT%	XRF
P2O5	0.1		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.