Sample GK-4-8

NavDat sample number 19343

Sample

Sample ID	GK-4-8
Rock type	VOLCANIC
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	61.47		WT%	XRF
TIO2	0.52		WT%	XRF
AL2O3	17.33		WT%	XRF
FE2O3	4.27		WT%	XRF
MNO	0.06		WT%	XRF
MGO	0.94		WT%	XRF
CAO	3.17		WT%	XRF
NA2O	4.13		WT%	XRF
K2O	4.62		WT%	XRF
P2O5	0.3		WT%	XRF
LOI	1.05		WT%	XRF
RB	139		PPM	XRF
SR	1070		PPM	XRF
BA	2690		PPM	XRF
Y	30		PPM	XRF
ZR	284		PPM	XRF
NI	6		PPM	XRF
CR	30		PPM	XRF
CO	6		PPM	XRF
SC	4.5		PPM	XRF
HF	6.9		PPM	XRF
TH	11		PPM	XRF
TA	1.8		PPM	XRF
U	2.8		PPM	XRF
LA	81.1		PPM	INAA
CE	151		PPM	INAA
NI	52		PPM	INAA
SM	8.18		PPM	INAA
EU	2.19		PPM	INAA
TB	0.8		PPM	INAA
YB	2.76		PPM	INAA
LU	0.4		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. .