Sample 493

NavDat sample number 88003 · DACITE

Sample

Sample ID	493
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	lava remnant

Location

Latitude	48.8577
Longitude	-121.735
Location	Barometer Mountain
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.191		1.097	1.285

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	66.3		WT%	XRF
TIO2	0.63		WT%	XRF
AL2O3	16.36		WT%	XRF
FEOT	4.03		WT%	XRF
MNO	0.08		WT%	XRF
MGO	1.66		WT%	XRF
CAO	4.18		WT%	XRF
NA2O	3.85		WT%	XRF
K2O	2.239		WT%	XRF
P2O5	0.27		WT%	XRF
LOI	2.3		WT%	XRF
TOTAL	96.82		WT%	XRF
RB	84		PPM	XRF
SR	465		PPM	XRF
Y	18		PPM	XRF
ZR	181		PPM	XRF
BA	1000		PPM	XRF
CE	43		PPM	XRF
V	75		PPM	XRF
ZN	59		PPM	XRF

References

Hildreth, Wes; Lanphere, Marvin A; Champion, Duane E; Fierstein, Judy (2004) Rhyodacites of Kulshan Caldera, north Cascades of Washington;post-caldera lavas that span the Jaramillo. Journal of Volcanology and Geothermal Research, vol.130, no.3-4,pp.227-264, 29 Feb 2004 doi:10.1016/S0377-0273(03)00290-7