Sample SP-4

NavDat sample number 29291 · BASALT

Sample

Sample ID	SP-4
Rock name	BASALT
Rock type	VOLCANIC
Composition	MAFIC
Material	IGNEOUS
Comment	alkali olivine basalt; aa flow erupted from cinder cone; nearly aphyritic; rare phenos of olivine and plag; intersertal groundmass of plag, olivine, glass, rare pyroxene, and stable K-feldspar; contains numerous granitic xenoliths in various stages of dissaggregation near its vent; location given is for the vent

Latitude	43.525
Longitude	-115.566
Location	Western Snake River Plain
State / province	Idaho
Volcanic field	Boise River Group 2, Smith Creek basalt

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.35		0.2	0.5

Item	Value	Unit	Method
SIO2	47.7	WT%	EPMA
TIO2	2.54	WT%	EPMA
AL2O3	16.3	WT%	EPMA
FEOT	12.97	WT%	EPMA
MNO	0.18	WT%	EPMA
MGO	7.27	WT%	EPMA
CAO	9.56	WT%	EPMA
NA2O	2.78	WT%	EPMA
K2O	1.31	WT%	EPMA
P2O5	0.33	WT%	EPMA
TOTAL	100.93	WT%	EPMA
NB	27	PPM	XRF
ZR	150	PPM	XRF
Y	33	PPM	XRF
SR	369	PPM	XRF
RB	28	PPM	XRF
NI	92	PPM	XRF
CR	175	PPM	XRF
V	265	PPM	XRF
SC	27	PPM	XRF
BA	509	PPM	XRF