Sample 200

NavDat sample number 30766 · RHYOLITE

Sample

Sample ID	200
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	37.775
Longitude	-118.708
Location	Glass Mountain
State / province	California

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
2.13		1.917	2.343

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	76.7		WT%	EDXRF
TIO2	0.06		WT%	EDXRF
AL2O3	13		WT%	EDXRF
FE2O3	0.64		WT%	EDXRF
MNO	0.06		WT%	EDXRF
CAO	0.32		WT%	EDXRF
NA2O	4.52		WT%	EDXRF
K2O	4.57		WT%	EDXRF
LOI	0.4		WT%	EDXRF
RB	250		PPM	EDXRF
Y	33		PPM	EDXRF
ZR	90		PPM	EDXRF
NB	43		PPM	EDXRF

References

Metz, J M; Mahood, G A (1991) Development of the Long Valley, California, magma chamber recorded inprecaldera rhyolite lavas of Glass Mountain. Contributions to Mineralogy and Petrology, vol.106, no.3, pp.379-397,1991 doi:10.1007/BF00324565