Sample LM79-468

NavDat sample number 61520 · RHYOLITE

Sample

Sample ID	LM79-468
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Muffler
Comment	Grays Peak

Location

Latitude	40.3852
Longitude	-121.685
State / province	California
Volcanic field	Maidu Volcanic Center

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
2.65		0	5.3

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	75.46		WT%	WDXRF
AL2O3	13.16		WT%	WDXRF
FE2O3	0.28		WT%	WDXRF
FEO	1.02		WT%	WDXRF
FEOT	1.28		WT%	WDXRF
MGO	0.38		WT%	WDXRF
CAO	1.16		WT%	WDXRF
NA2O	3.79		WT%	WDXRF
K2O	4.44		WT%	WDXRF
TIO2	0.26		WT%	WDXRF
P2O5	0.04		WT%	WDXRF
MNO	0.01		WT%	WDXRF
LOI	2.48		WT%	LOI
TOTAL	97.39		WT%	WDXRF
MG_NUMBER	39.9			WDXRF

References

Clynne, M.A., Muffler, L.J.P., Siems, D.F., Taggert Jr., J.E., Bruggman, P. (2008) Major and EDXRF trace element chemical analyses of volcanic rocks from Lassen Volcanic National Park and vicinity, California. Open-File Report - U. S. Geological Survey. 2008. Report # OF. 2008-1091