Sample 87-172

NavDat sample number 55943 · DACITE

Sample

Sample ID	87-172
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.497
Longitude	-121.882
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	63.13		WT%	XRF
TIO2	1.14		WT%	XRF
AL2O3	15.29		WT%	XRF
FEO	7.79		WT%	XRF
MNO	0.17		WT%	XRF
MGO	1.45		WT%	XRF
CAO	4.59		WT%	XRF
NA2O	4.44		WT%	XRF
K2O	1.65		WT%	XRF
P2O5	0.35		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.