Sample 4021

NavDat sample number 12236 · RHYOLITE

Sample

Sample ID	4021
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	rhyolite

Location

Latitude	29
Longitude	-104
Location	Santana Tuff,
State / province	Texas

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
27.8		26	38

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	76.23		WT%	XRF
TIO2	0.14		WT%	XRF
AL2O3	12.2		WT%	XRF
FE2O3	0.29		WT%	XRF
FEO	1.46		WT%	XRF
MNO	0.04		WT%	XRF
MGO	0.04		WT%	XRF
CAO	0.81		WT%	XRF
NA2O	3.5		WT%	XRF
K2O	5.27		WT%	XRF
P2O5	0.01		WT%	XRF
TOTAL	100		WT%	XRF
RB	237		PPM	MS-ID
SR	46		PPM	MS-ID
Y	76		PPM	MS-ID
ZR	367		PPM	MS-ID
NB	99		PPM	MS-ID

References

Cameron, Kenneth L; Cameron, Maryellen (1986) Geochemistry of quartz-normative igneous rocks from the Chinati Mountains and Terlingua areas, West Texas; a comparison with Cenozoic volcanic rocks from Chihuahua and Baja California Sur, Mexico. Guidebook - Bureau of Economic Geology, University of Texas at Austin. 23; Pages 143-163. 1986. .