Sample 82

NavDat sample number 88032 · RHYODACITE

Sample

Sample ID	82
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	small lava remnants, mostly glassy, including proximal fused-breccia facies

Location

Latitude	48.8494
Longitude	-121.719
Location	Iceberg Lake
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.063		1.051	1.075

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	72.3		WT%	XRF
TIO2	0.34		WT%	XRF
AL2O3	14.66		WT%	XRF
FEOT	1.9		WT%	XRF
MNO	0.06		WT%	XRF
MGO	0.48		WT%	XRF
CAO	1.5		WT%	XRF
NA2O	4.96		WT%	XRF
K2O	3.33		WT%	XRF
P2O5	0.09		WT%	XRF
LOI	3.93		WT%	XRF
TOTAL	95.1		WT%	XRF
RB	68		PPM	XRF
SR	190		PPM	XRF
Y	20		PPM	XRF
ZR	245		PPM	XRF
BA	1050		PPM	XRF
CE	30		PPM	XRF
V	40		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