Sample 297

NavDat sample number 88022 · RHYODACITE

Sample

Sample ID	297
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	Lava flow

Location

Latitude	48.863
Longitude	-121.812
Location	Deadhorse Creek
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.151		1.135	1.167

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	71.9		WT%	XRF
TIO2	0.35		WT%	XRF
AL2O3	15.41		WT%	XRF
FEOT	1.61		WT%	XRF
MNO	0.02		WT%	XRF
MGO	0.26		WT%	XRF
CAO	2.23		WT%	XRF
NA2O	4.65		WT%	XRF
K2O	3.05		WT%	XRF
P2O5	0.15		WT%	XRF
LOI	0.73		WT%	XRF
TOTAL	98.27		WT%	XRF
RB	65		PPM	XRF
SR	295		PPM	XRF
Y	17		PPM	XRF
ZR	203		PPM	XRF
BA	1260		PPM	XRF
CE	52		PPM	XRF
V	26		PPM	XRF
ZN	32		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