Sample 87-175

NavDat sample number 55949 · DACITE

Sample

Sample ID	87-175
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.463
Longitude	-121.881
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	67.26		WT%	XRF
TIO2	0.89		WT%	XRF
AL2O3	15.76		WT%	XRF
FEO	4.84		WT%	XRF
MNO	0.19		WT%	XRF
MGO	0.62		WT%	XRF
CAO	3.38		WT%	XRF
NA2O	4.84		WT%	XRF
K2O	1.94		WT%	XRF
P2O5	0.29		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.