Sample 9

NavDat sample number 5458

Sample

Sample ID	9
Rock type	VOLCANIC
Material	IGNEOUS

Location

Latitude	24.0333
Longitude	-104.45
Location	Durango City
State / province	Durango
Formation	Aguila Formation

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
30.8		29.3	32.1

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	75.1		WT%	UNKNOWN
TIO2	0.28		WT%	UNKNOWN
AL2O3	12.4		WT%	UNKNOWN
FE2O3	2.43		WT%	UNKNOWN
FEO	0.28		WT%	UNKNOWN
MNO	0.04		WT%	UNKNOWN
MGO	0.1		WT%	UNKNOWN
CAO	0.6		WT%	UNKNOWN
NA2O	2.8		WT%	UNKNOWN
K2O	5.12		WT%	UNKNOWN
H2O_PLUS	0.97		WT%	UNKNOWN
H2O_MINUS	0.23		WT%	UNKNOWN
P2O5	0.14		WT%	UNKNOWN
CO2	0.02		WT%	UNKNOWN

References

Swanson, E R; Keizer, R P; Lyons, J I; Clabaugh, S E (1978) Tertiary volcanism and caldera development near Durango City, Sierra Madre Occidental, Mexico. Geological Society of America Bulletin, vol.89, no.7, pp.1000-1012, Jul 1978 doi:10.1130/0016-7606(1978)89<1000:TVACDN>2.0.CO;2