Sample 87-219

NavDat sample number 22345 · DACITE

Sample

Sample ID	87-219
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.4925
Longitude	-121.801
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
25		23	27

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	70.06		WT%	XRF
TIO2	0.46		WT%	XRF
AL2O3	16.42		WT%	XRF
FEO	3.27		WT%	XRF
MNO	0.07		WT%	XRF
MGO	0.1		WT%	XRF
CAO	2.52		WT%	XRF
NA2O	4.47		WT%	XRF
K2O	2.49		WT%	XRF
P2O5	0.12		WT%	XRF

References

Swanson, Donald A (1991) Geologic map of the Tower Rock Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1991.