Sample DS88-091

NavDat sample number 45955 · ANDESITE

Sample

Sample ID	DS88-091
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	37.574
Longitude	-106.981
Location	Capping flow of South River Peak same loc as 88L-65
State / province	COLORADO
Formation	South River Caldera Cycle, Silver River volcanics

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
27		26.9	27.1

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	59.37		WT%	XRF
TIO2	0.948169		WT%	XRF
AL2O3	16.4719		WT%	XRF
FE2O3	6.9297		WT%	XRF
MGO	2.81425		WT%	XRF
CAO	5.9311		WT%	XRF
NA2O	3.87337		WT%	XRF
K2O	2.83442		WT%	XRF
P2O5	0.504345		WT%	XRF
MNO	0.141217		WT%	XRF
LOI	0.86		WT%	XRF
TOTAL	99.82		WT%	XRF
RB	58		PPM	XRF
SR	935		PPM	XRF
ZR	195		PPM	XRF
BA	1322		PPM	XRF

References

Lipman, Peter W (2004) Chemical analyses of Tertiary volcanic rocks, central San Juan Caldera complex, southwestern Colorado. Open-File Report - U. S. Geological Survey. 2004. .