Sample LC85-769

NavDat sample number 61315 · RHYODACITE

Sample

Sample ID	LC85-769
Rock name	RHYODACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Clynne
Comment	Reading Peak

Location

Latitude	40.4316
Longitude	-121.492
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	70.97		WT%	WDXRF
AL2O3	14.8		WT%	WDXRF
FE2O3	0.56		WT%	WDXRF
FEO	2.01		WT%	WDXRF
FEOT	2.52		WT%	WDXRF
MGO	0.99		WT%	WDXRF
CAO	2.41		WT%	WDXRF
NA2O	4.06		WT%	WDXRF
K2O	3.57		WT%	WDXRF
TIO2	0.45		WT%	WDXRF
P2O5	0.13		WT%	WDXRF
MNO	0.05		WT%	WDXRF
LOI	0.15		WT%	LOI
TOTAL	98.86		WT%	WDXRF
MG_NUMBER	46.8			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