Sample 556

NavDat sample number 12224 · TRACHYBASALT

Sample

Sample ID	556
Rock name	TRACHYBASALT
Rock type	VOLCANIC
Composition	MAFIC
Material	IGNEOUS
Comment	Trachybasalt lava

Location

Latitude	29.25
Longitude	-103.767
Location	Tule Mountain Trachyandesite, 1.5 miles NW of Lajitas on River Road
State / province	Texas

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
31.8		26	38

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	50.94		WT%	XRF
TIO2	2.88		WT%	XRF
AL2O3	15.62		WT%	XRF
FE2O3	1.34		WT%	XRF
FEO	11.17		WT%	XRF
MNO	0.17		WT%	XRF
MGO	3.82		WT%	XRF
CAO	7.81		WT%	XRF
NA2O	3.4		WT%	XRF
K2O	2.21		WT%	XRF
P2O5	0.64		WT%	XRF
TOTAL	100		WT%	XRF
NI	10		PPM	MS-ID
RB	57		PPM	MS-ID
SR	539		PPM	MS-ID
Y	36		PPM	MS-ID
ZR	312		PPM	MS-ID
NB	24		PPM	MS-ID

References

Cameron, Kenneth L; Cameron, Maryellen (1986) Geochemistry of quartz-normative igneous rocks from the Chinati Mountains and Terlingua areas, West Texas; a comparison with Cenozoic volcanic rocks from Chihuahua and Baja California Sur, Mexico. Guidebook - Bureau of Economic Geology, University of Texas at Austin. 23; Pages 143-163. 1986. .