Sample 287

NavDat sample number 87992 · RHYODACITE

Sample

Sample ID	287
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	Intrusive-extrusive dome

Location

Latitude	48.8207
Longitude	-121.722
Location	Corax Dome
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.109		1.09	1.128

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	71.1		WT%	XRF
TIO2	0.44		WT%	XRF
AL2O3	15.58		WT%	XRF
FEOT	2.22		WT%	XRF
MNO	0.03		WT%	XRF
MGO	0.43		WT%	XRF
CAO	2.11		WT%	XRF
NA2O	4.73		WT%	XRF
K2O	2.81		WT%	XRF
P2O5	0.17		WT%	XRF
LOI	1.2		WT%	XRF
TOTAL	97.8		WT%	XRF
RB	54		PPM	XRF
SR	293		PPM	XRF
Y	17		PPM	XRF
ZR	212		PPM	XRF
BA	1180		PPM	XRF
CE	49		PPM	XRF
V	27		PPM	XRF
ZN	48		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