Sample Table 2 K-spar altered porphyry

NavDat sample number 9143 · DACITE

Sample

Sample ID	Table 2 K-spar altered porphyry
Rock name	DACITE
Rock type	PLUTONIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	40.33
Longitude	-106.25
Location	A.O. Porphyry
State / province	COLORADO

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
23.5		18.5	28.5

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	48.5		WT%	EPMA
AL2O3	5.88		WT%	EPMA
TIO2	0.77		WT%	EPMA
FEO	11.7		WT%	EPMA
MGO	17		WT%	EPMA
CAO	11.3		WT%	EPMA
MNO	0.39		WT%	EPMA
NA2O	1.74		WT%	EPMA
K2O	0.79		WT%	EPMA
TOTAL	98		WT%	EPMA

References

Karimpour, Mohammad Hassan (1982) Petrology, geochemistry, and genesis of the A.O. porphyry copper complex in Jackson and Grand counties, northwestern Colorado.