Sample R21

NavDat sample number 19239 · TRACHYTE

Sample

Sample ID	R21
Rock name	TRACHYTE
Rock type	VOLCANIC
Composition	INTERMEDIATE
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	67.19		WT%	XRF
TIO2	0.28		WT%	XRF
AL2O3	17.19		WT%	XRF
FE2O3	1.64		WT%	XRF
FEO	0.44		WT%	XRF
MNO	0.09		WT%	XRF
MGO	0.43		WT%	XRF
CAO	1.45		WT%	XRF
NA2O	4.58		WT%	XRF
K2O	5.51		WT%	XRF
P2O5	0.05		WT%	XRF
LOI	1.4		WT%	XRF
RB	136		PPM	XRF
SR	593		PPM	XRF
BA	2079		PPM	XRF
Y	13		PPM	XRF
ZR	353		PPM	XRF
V	13		PPM	XRF
NI	4		PPM	XRF
CR	11		PPM	XRF
CO	1.6		PPM	XRF
SC	2		PPM	XRF
HF	8.1		PPM	XRF
TH	15		PPM	XRF
TA	2.4		PPM	XRF
U	3.1		PPM	XRF
LA	87.4		PPM	INAA
CE	130		PPM	INAA
NI	44		PPM	INAA
SM	7.1		PPM	INAA
EU	1.98		PPM	INAA
TB	0.9		PPM	INAA
YB	2.96		PPM	INAA
LU	0.45		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. .