Sample 57-171

NavDat sample number 5081 · RHYOLITE

Sample

Sample ID	57-171
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	29.2333
Longitude	-103.4
Location	lower flow, Burro Mesa Rhyolite at Burro Mesa Pouroff
State / province	Texas

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
29		26	38

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	74.32		WT%	UNKNOWN
TIO2	0.2		WT%	UNKNOWN
AL2O3	11.5		WT%	UNKNOWN
FE2O3	3.73		WT%	UNKNOWN
MNO	0.08		WT%	UNKNOWN
CAO	0.15		WT%	UNKNOWN
NA2O	5.44		WT%	UNKNOWN
K2O	4.53		WT%	UNKNOWN
P2O5	0.01		WT%	UNKNOWN
TOTAL	99.96		WT%	UNKNOWN
RB	376		PPM	UNKNOWN
SR	5		PPM	UNKNOWN
Y	103		PPM	UNKNOWN
NB	178		PPM	UNKNOWN
TH	47		PPM	UNKNOWN

References

Becker, Susan Ward (1976) Field relations and petrology of the Burro Mesa Riebeckite Rhyolite, Big Bend National Park, Texas.