Sample SSP-21

NavDat sample number 29338 · BASALT

Sample

Sample ID	SSP-21
Rock name	BASALT
Rock type	VOLCANIC
Composition	MAFIC
Material	IGNEOUS
Comment	alkali olivine basalt; erupted from small shield volcano 1.5 km south of cinder cone which sourced the other Smith Praire units; porphyritic with phenos of plag and olivine in intersertal to intergranular groundmass of plag, olivine, pyroxene, sanidine, glass and opaques; given location is for the vent

Latitude	43.509
Longitude	-115.505
Location	Western Snake River Plain
State / province	Idaho
Volcanic field	Boise River Group 2, Smith Praire basalt, unit 3

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.2		0.05	0.35

Item	Value	Unit	Method
SIO2	48.8	WT%	EPMA
TIO2	1.94	WT%	EPMA
AL2O3	17.2	WT%	EPMA
FEOT	10.33	WT%	EPMA
MNO	0.13	WT%	EPMA
MGO	6.65	WT%	EPMA
CAO	9.69	WT%	EPMA
NA2O	2.89	WT%	EPMA
K2O	1.53	WT%	EPMA
P2O5	0.44	WT%	EPMA
TOTAL	99.61	WT%	EPMA
NB	35	PPM	XRF
ZR	178	PPM	XRF
Y	19	PPM	XRF
SR	518	PPM	XRF
RB	41	PPM	XRF
NI	77	PPM	XRF
CR	131	PPM	XRF
V	194	PPM	XRF
SC	23	PPM	XRF
BA	596	PPM	XRF