Sample 275C

NavDat sample number 87996 · RHYODACITE

Sample

Sample ID	275C
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others

Location

Latitude	48.8036
Longitude	-121.713
Location	Swift-Rainbow Divide
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.18		1.163	1.197

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	72.2		WT%	XRF
TIO2	0.35		WT%	XRF
AL2O3	15.65		WT%	XRF
FEOT	1.18		WT%	XRF
MNO	0.02		WT%	XRF
MGO	0.28		WT%	XRF
CAO	1.86		WT%	XRF
NA2O	4.89		WT%	XRF
K2O	3.04		WT%	XRF
P2O5	0.12		WT%	XRF
LOI	0.86		WT%	XRF
TOTAL	98.63		WT%	XRF
RB	60		PPM	XRF
SR	266		PPM	XRF
Y	16		PPM	XRF
ZR	223		PPM	XRF
BA	1090		PPM	XRF
CE	50		PPM	XRF
V	25		PPM	XRF
ZN	39		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