Sample 66L-96-B

NavDat sample number 4499

Sample

Sample ID	66L-96-B
Rock type	VOLCANIC
Material	IGNEOUS

Location

Latitude	37.55
Longitude	-106.776
Location	Hwy 160 roadcut, Pass Creek
State / province	COLORADO

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
27.93		27.75	28.11

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	68.7		WT%	XRF
TIO2	0.44		WT%	XRF
AL2O3	16.3		WT%	XRF
FE2O3	3.5		WT%	XRF
MGO	0.69		WT%	XRF
CAO	3		WT%	XRF
NA2O	3.4		WT%	XRF
K2O	3.4		WT%	XRF
P2O5	0.2		WT%	XRF
MNO	0.07		WT%	XRF
LOI	0.9		WT%	XRF
TOTAL	99.7		WT%	XRF

References

Lipman, P W (1975) Evolution of the Platoro caldera complex and related volcanic rocks, southeastern San Juan Mountains, Colorado. U. S. Geological Survey Professional Paper. 1975. .