Sample 228

NavDat sample number 17707 · RHYOLITE

Sample

Sample ID	228
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	Maximum and minimum ages given are approximations based on average error of previous K-Ar dating.

Location

Latitude	32.8831
Longitude	-109.048
Location	Steeple Rock
State / province	New Mexico

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
31.5		28.9	34.1

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	75.39		WT%	EDXRF
TIO2	0.05		WT%	EDXRF
AL2O3	12.01		WT%	EDXRF
FEO	0.75		WT%	EDXRF
MNO	0.02		WT%	EDXRF
MGO	0.11		WT%	EDXRF
CAO	0.51		WT%	EDXRF
NA2O	2.92		WT%	EDXRF
K2O	4.87		WT%	EDXRF
H2O_PLUS	2.45		WT%	EDXRF
TOTAL	99.08		WT%	EDXRF

References

Bornhorst, Theodore Joseph (1980) Major- and trace-element geochemistry and mineralogy of upper Eocene to Quaternary volcanic rocks of the Mogollon-Datil volcanic field, southwestern New Mexico.