Sample 87-029

NavDat sample number 55950 · DACITE

Sample

Sample ID	87-029
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.4045
Longitude	-121.944
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
21		19	23

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	70.36		WT%	XRF
TIO2	0.86		WT%	XRF
AL2O3	13.83		WT%	XRF
FEO	4.74		WT%	XRF
MNO	0.07		WT%	XRF
MGO	0.51		WT%	XRF
CAO	3.09		WT%	XRF
NA2O	3.89		WT%	XRF
K2O	2.4		WT%	XRF
P2O5	0.25		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.