Sample 7

NavDat sample number 5456 · ANDESITE

Sample

Sample ID	7
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

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

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
51.6		50.3	52.9

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	59.1		WT%	UNKNOWN
TIO2	0.88		WT%	UNKNOWN
AL2O3	16.5		WT%	UNKNOWN
FE2O3	2		WT%	UNKNOWN
FEO	4.27		WT%	UNKNOWN
MNO	0.11		WT%	UNKNOWN
MGO	2.74		WT%	UNKNOWN
CAO	6.23		WT%	UNKNOWN
NA2O	3.66		WT%	UNKNOWN
K2O	0.95		WT%	UNKNOWN
H2O_PLUS	1.76		WT%	UNKNOWN
H2O_MINUS	0.44		WT%	UNKNOWN
P2O5	0.25		WT%	UNKNOWN
CO2	0.2		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