Sample 189

NavDat sample number 88025 · RHYODACITE

Sample

Sample ID	189
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	60.2		WT%	XRF
TIO2	0.9		WT%	XRF
AL2O3	17.61		WT%	XRF
FEOT	6.25		WT%	XRF
MNO	0.11		WT%	XRF
MGO	2.66		WT%	XRF
CAO	6.04		WT%	XRF
NA2O	3.78		WT%	XRF
K2O	1.78		WT%	XRF
P2O5	0.25		WT%	XRF
LOI	2.56		WT%	XRF
TOTAL	96.12		WT%	XRF
RB	33		PPM	XRF
SR	650		PPM	XRF
Y	20		PPM	XRF
ZR	116		PPM	XRF
BA	560		PPM	XRF
CE	30		PPM	XRF
V	63		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