Sample HSP-72

NavDat sample number 29339 · BASALT

Sample

Sample ID	HSP-72
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	49.5	WT%	EPMA
TIO2	1.98	WT%	EPMA
AL2O3	17.1	WT%	EPMA
FEOT	10.43	WT%	EPMA
MNO	0.15	WT%	EPMA
MGO	7.27	WT%	EPMA
CAO	9.84	WT%	EPMA
NA2O	2.11	WT%	EPMA
K2O	1.16	WT%	EPMA
P2O5	0.08	WT%	EPMA
TOTAL	99.67	WT%	EPMA
NB	34	PPM	XRF
ZR	176	PPM	XRF
Y	33	PPM	XRF
SR	514	PPM	XRF
RB	39	PPM	XRF
NI	69	PPM	XRF
CR	135	PPM	XRF
V	188	PPM	XRF
SC	22	PPM	XRF
BA	593	PPM	XRF