Sample LC81-710A

NavDat sample number 61111 · ANDESITE

Sample

Sample ID	LC81-710A
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Collected by	Clynne
Comment	Reading Peak

Location

Latitude	40.472
Longitude	-121.406
State / province	California
Volcanic field	Lassen Volcanics, Twin Lakes Sequence, Younger

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	54.85		WT%	WDXRF
AL2O3	17.41		WT%	WDXRF
FE2O3	1.68		WT%	WDXRF
FEO	6.06		WT%	WDXRF
FEOT	7.57		WT%	WDXRF
MGO	5.22		WT%	WDXRF
CAO	9.56		WT%	WDXRF
NA2O	3.05		WT%	WDXRF
K2O	0.87		WT%	WDXRF
TIO2	0.95		WT%	WDXRF
P2O5	0.21		WT%	WDXRF
MNO	0.14		WT%	WDXRF
LOI	0.25		WT%	LOI
TOTAL	100.03		WT%	WDXRF
MG_NUMBER	60.6			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