Sample 85911AL

NavDat sample number 50088 · ANDESITE

Sample

Sample ID	85911AL
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	37.8333
Longitude	-106.333
State / province	Colorado
Volcanic field	Eastern San Juan Volcanic Field

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
32.5		30	35

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
TH	3.3		PPM	INAA
LA	35.9		PPM	INAA
CE	70		PPM	INAA
ND	33		PPM	INAA
SM	7.11		PPM	INAA
EU	1.85		PPM	INAA
TB	0.8		PPM	INAA
YB	2.51		PPM	INAA
LU	0.38		PPM	INAA

References

Parker, D F; Ghosh, A; Price, C W; Rinard, B D; Cullers, R L; Ren, M (2005) Origin of rhyolite by crustal melting and the nature of parentalmagmas in the Oligocene Conejos Formation, San Juan Mountains,Colorado, USA. Journal of Volcanology and Geothermal Research, vol.139, no.3-4,pp.185-210, 15 Jan 2005 doi:10.1016/j.jvolgeores.2004.08.015