Sample 87-109

NavDat sample number 16985 · RHYOLITE

Sample

Sample ID	87-109
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	37.897
Longitude	-106.899
Location	First Fork, Willow Ck., 11,240'
State / province	COLORADO

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
27.35		27.25	27.45

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
TH	13.6		PPM	INAA
U	4.1		PPM	INAA
LA	42		PPM	INAA
CE	71.3		PPM	INAA
ND	19.5		PPM	INAA
SM	5.32		PPM	INAA
EU	1.04		PPM	INAA
GD	5.2		PPM	INAA
TB	0.59		PPM	INAA
YB	2.32		PPM	INAA
LU	0.33		PPM	INAA
TA	1		PPM	INAA
HF	3.71		PPM	INAA
SC	4		PPM	INAA

References

Webber, Karen Louise (1988) The Mammoth Mountain and Wason Park tuffs; magmatic evolution in the central San Juan volcanic field, southwestern Colorado.