Sample 86-200

NavDat sample number 55903 · PYROCLASTIC-FALL

Sample

Sample ID	86-200
Rock name	PYROCLASTIC-FALL
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.3517
Longitude	-121.882
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
30		24	36

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	67.46		WT%	XRF
TIO2	0.72		WT%	XRF
AL2O3	16.45		WT%	XRF
FEO	5.4		WT%	XRF
MNO	0.08		WT%	XRF
MGO	1.83		WT%	XRF
CAO	5.98		WT%	XRF
NA2O	1.01		WT%	XRF
K2O	0.93		WT%	XRF
P2O5	0.13		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.