Sample 93L-5B

NavDat sample number 36765 · RHYOLITE

Sample

Sample ID	93L-5B
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	37.687
Longitude	-106.626
Location	Ridge, btw W Bear & Alder Cr
State / province	COLORADO

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
28.41		28.31	28.51

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	64.6		WT%	XRF
TIO2	0.53		WT%	XRF
AL2O3	16.1		WT%	XRF
FE2O3	3.49		WT%	XRF
MGO	0.92		WT%	XRF
CAO	2.85		WT%	XRF
NA2O	3.89		WT%	XRF
K2O	4.4		WT%	XRF
P2O5	0.25		WT%	XRF
MNO	0.09		WT%	XRF
LOI	1.89		WT%	XRF
TOTAL	97.12		WT%	XRF
RB	100		PPM	XRF
SR	550		PPM	XRF
Y	30		PPM	XRF
ZR	215		PPM	XRF
NB	12		PPM	XRF
BA	1100		PPM	XRF
LA	43		PPM	XRF
CE	73		PPM	XRF

References

Lipman, Peter W; Dungan, Michael A; Brown, Laurie L; Deino, Alan L (1996) Recurrent eruption and subsidence at the Platoro Caldera complex, southeastern San Juan volcanic field, Colorado; new tales from old tuffs. Geological Society of America Bulletin. 108; 8, Pages 1039-1055. 1996. .