Sample LM80-899

NavDat sample number 61532 · RHYODACITE

Sample

Sample ID	LM80-899
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Muffler
Comment	Lassen Peak

Location

Latitude	40.4307
Longitude	-121.509
State / province	California
Volcanic field	Lassen Volcanics, Bumpass Sequence

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	69.42		WT%	WDXRF
AL2O3	15.79		WT%	WDXRF
FE2O3	0.58		WT%	WDXRF
FEO	2.11		WT%	WDXRF
FEOT	2.63		WT%	WDXRF
MGO	1.11		WT%	WDXRF
CAO	2.88		WT%	WDXRF
NA2O	4.46		WT%	WDXRF
K2O	3.04		WT%	WDXRF
TIO2	0.46		WT%	WDXRF
P2O5	0.1		WT%	WDXRF
MNO	0.05		WT%	WDXRF
LOI	0.66		WT%	LOI
TOTAL	68.6		WT%	WDXRF
MG_NUMBER	48.5			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