Sample 188

NavDat sample number 87994 · RHYODACITE

Sample

Sample ID	188
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	Intracaldera rhyodacite ignimbrite

Location

Latitude	48.8411
Longitude	-121.696
Location	Swift Creek
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.149		1.139	1.159

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	72.5		WT%	XRF
TIO2	0.36		WT%	XRF
AL2O3	14.41		WT%	XRF
FEOT	2.1		WT%	XRF
MNO	0.06		WT%	XRF
MGO	0.81		WT%	XRF
CAO	2.15		WT%	XRF
NA2O	3.8		WT%	XRF
K2O	3.34		WT%	XRF
P2O5	0.12		WT%	XRF
LOI	4.56		WT%	XRF
TOTAL	94.7		WT%	XRF
RB	67		PPM	XRF
SR	285		PPM	XRF
Y	16		PPM	XRF
ZR	146		PPM	XRF
BA	910		PPM	XRF
CE	30		PPM	XRF
V	35		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