Sample 81JD218

NavDat sample number 16771 · RHYOLITE

Sample

Sample ID	81JD218
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	36.875
Longitude	-121.185
Location	central Diablo Range
State / province	California
Volcanic field	Quien Sabe

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
9.7		8.5	10.9

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	73.71		WT%	XRF
AL2O3	14.55		WT%	XRF
FE2O3	0.66		WT%	XRF
FEO	0.89		WT%	XRF
MGO	0.82		WT%	XRF
CAO	1.54		WT%	XRF
NA2O	3.57		WT%	XRF
K2O	4.48		WT%	XRF
TIO2	0.28		WT%	XRF
P2O5	0.05		WT%	XRF
MNO	0.03		WT%	XRF

References

Drinkwater, J L; Weigand, P W; Sorg, D H (1988) Petrographic and chemical data for the Quien Sabe volcanic rocks in the Mariposa Peak Quadrangle, central Diablo Range, California. Open-File Report - U. S. Geological Survey. 1988.