Sample PZ-217

NavDat sample number 12240 · ANDESITE

Sample

Sample ID	PZ-217
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	Escobillas andesite

Location

Latitude	28.6668
Longitude	-104.167
Location	1.5km E of Cerro Escobillas
State / province	Chihuahua

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
29.5		26	38

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	58.02		WT%	XRF
TIO2	2.14		WT%	XRF
AL2O3	15.11		WT%	XRF
FE2O3	1.52		WT%	XRF
FEO	7.6		WT%	XRF
MGO	2.52		WT%	XRF
CAO	5.16		WT%	XRF
NA2O	3.8		WT%	XRF
K2O	3.54		WT%	XRF
LOI	1.8		WT%	XRF
TOTAL	100.44		WT%	XRF
NI	9		PPM	MS-ID
RB	96		PPM	MS-ID
SR	388		PPM	MS-ID
Y	43		PPM	MS-ID
ZR	334		PPM	MS-ID
NB	28		PPM	MS-ID

References

Cameron, Kenneth L; Cameron, Maryellen (1986) Geochemistry of quartz-normative igneous rocks from the Chinati Mountains and Terlingua areas, West Texas; a comparison with Cenozoic volcanic rocks from Chihuahua and Baja California Sur, Mexico. Guidebook - Bureau of Economic Geology, University of Texas at Austin. 23; Pages 143-163. 1986. .