Sample 19

NavDat sample number 5466

Sample

Sample ID	19
Rock type	VOLCANIC
Material	IGNEOUS

Location

Latitude	23.9
Longitude	-105
Location	Durango City
State / province	Durango
Formation	Soldado Formation

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
28.8		27.7	29.9

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	76.69		WT%	UNKNOWN
TIO2	0.25		WT%	UNKNOWN
AL2O3	12.5		WT%	UNKNOWN
FE2O3	1.22		WT%	UNKNOWN
FEO	0.17		WT%	UNKNOWN
MNO	0.02		WT%	UNKNOWN
MGO	0.17		WT%	UNKNOWN
CAO	0.25		WT%	UNKNOWN
NA2O	2.65		WT%	UNKNOWN
K2O	4.74		WT%	UNKNOWN
H2O_PLUS	1.33		WT%	UNKNOWN
H2O_MINUS	0.49		WT%	UNKNOWN
P2O5	0.03		WT%	UNKNOWN
CO2	0		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