Sample Wg.8

NavDat sample number 33456 · ANDESITE

Sample

Sample ID	Wg.8
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	40.11
Longitude	-106
Location	Windy Gap
State / province	COLORADO
Formation	Windy Gap member of Denver Formation

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
70.5		66	75

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	61		WT%	UNKNOWN
AL2O3	15.7		WT%	UNKNOWN
TIO2	0.65		WT%	UNKNOWN
FE2O3	4.3		WT%	UNKNOWN
FEO	2.1		WT%	UNKNOWN
CAO	5.1		WT%	UNKNOWN
MGO	1.9		WT%	UNKNOWN
K2O	3.2		WT%	UNKNOWN
NA2O	4		WT%	UNKNOWN
P2O5	0.4		WT%	UNKNOWN
H2O_PLUS	1.5		WT%	UNKNOWN
TOTAL	100.2		WT%	UNKNOWN

References

Larson, Edwin E; Drexler, John W Early Laramide mafic to intermediate volcanism, Front Range, Colorado. Colorado School of Mines Quarterly, vol.83, no.2, pp.41-52, 1988