Sample 492

NavDat sample number 88018 · DACITE

Sample

Sample ID	492
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	lava remnant

Location

Latitude	48.8568
Longitude	-121.733
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	65.1		WT%	XRF
TIO2	0.6		WT%	XRF
AL2O3	16.46		WT%	XRF
FEOT	4.22		WT%	XRF
MNO	0.09		WT%	XRF
MGO	2.23		WT%	XRF
CAO	4.82		WT%	XRF
NA2O	3.94		WT%	XRF
K2O	1.87		WT%	XRF
P2O5	0.25		WT%	XRF
LOI	3.51		WT%	XRF
TOTAL	95.81		WT%	XRF
RB	61		PPM	XRF
SR	467		PPM	XRF
Y	17		PPM	XRF
ZR	167		PPM	XRF
BA	904		PPM	XRF
CE	40		PPM	XRF
V	79		PPM	XRF
ZN	62		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