Sample DJ50

NavDat sample number 19241 · RHYOLITE

Sample

Sample ID	DJ50
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	38.7775
Longitude	-105.509
Location	Guffey Volcanic Center
State / province	Colorado
Volcanic field	39-Mile Volcanic Field

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
35		33.9	36.1

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	76.42		WT%	XRF
TIO2	0.08		WT%	XRF
AL2O3	13.78		WT%	XRF
FE2O3	0.29		WT%	XRF
MNO	0.05		WT%	XRF
MGO	0		WT%	XRF
CAO	1.03		WT%	XRF
NA2O	3.88		WT%	XRF
K2O	5		WT%	XRF
P2O5	0.03		WT%	XRF
RB	120		PPM	XRF
SR	400		PPM	XRF
BA	1300		PPM	XRF
NI	-50		PPM	XRF
CR	1.2		PPM	XRF
CO	1.6		PPM	XRF
SC	1.2		PPM	XRF
HF	3.2		PPM	XRF
TH	6.2		PPM	XRF
TA	2.2		PPM	XRF
U	4.5		PPM	XRF
LA	11.1		PPM	INAA
CE	21		PPM	INAA
NI	9		PPM	INAA
SM	1.73		PPM	INAA
EU	0.63		PPM	INAA
TB	0.4		PPM	INAA
YB	1.39		PPM	INAA
LU	0.26		PPM	INAA

References

Wobus, Reinhard A; Mochel, David W; Mertzman, Stanley A; Eide, Elizabeth A; Rothwarf, Miriam T; Loeffler, Bruce M; Johnson, David A; Keating, Gordon N; Sultze, Kimberly; Benjamin, Anne E; Venzke, Edward A; Filson, Tammy (1990) Geochemistry of high-potassium rocks from the mid-Tertiary Guffey volcanic center, Thirtynine Mile volcanic field, central Colorado; with Suppl. Data 90-15. Geology Boulder. 18; 7, Pages 642-645. 1990. .