Sample s129

NavDat sample number 88019 · RHYODACITE

Sample

Sample ID	s129
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Hildreth and others
Comment	NNW-trending dikes

Location

Latitude	48.8389
Longitude	-121.827
Location	Cougar Divide
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
1.293		1.277	1.309

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	69.2		WT%	XRF
TIO2	0.44		WT%	XRF
AL2O3	15.74		WT%	XRF
FEOT	3.37		WT%	XRF
MNO	0.03		WT%	XRF
MGO	0.9		WT%	XRF
CAO	2.61		WT%	XRF
NA2O	4.3		WT%	XRF
K2O	2.85		WT%	XRF
P2O5	0.15		WT%	XRF
LOI	1.68		WT%	XRF
TOTAL	97.44		WT%	XRF
RB	61		PPM	XRF
SR	375		PPM	XRF
Y	16		PPM	XRF
ZR	198		PPM	XRF
BA	1000		PPM	XRF
CE	35		PPM	XRF
V	55		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