Sample NTP-8

NavDat sample number 125510 · LAMPROITE

Sample

Sample ID	NTP-8
Rock name	LAMPROITE
Rock type	VOLCANIC
Composition	EXOTIC
Material	IGNEOUS

Location

Latitude	41.822
Longitude	-108.996
Location	Leucite Hill
State / province	Montana

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
2.25		1.4	3.1

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
RB	238		PPM	XRF
SR	2146		PPM	ICPAES
PB	38.97		PPM	XRF
SM	23.5		PPM	ICPAES
ND	198		PPM	ICPAES
SR87_SR86	0.705819			MS
ND143_ND144	0.512024			MS
U	6.9		PPM	INAA
TH	31.2		PPM	INAA
CS	2.88		PPM	INAA
TA	4.78		PPM	INAA
HF	42		PPM	INAA
PB206_PB204	17.562			MS
PB207_PB204	15.485			MS
PB208_PB204	37.599			MS

References

O'Brien, Hugh E; Irving, Anthony J; McCallum, I S; Thirlwall, MatthewF (1995) Strontium, neodymium, and lead isotope evidence for the interaction ofpost-subduction asthenospheric potassic mafic magmas of the HighwoodMountains, Montana, USA, with ancient Wyoming craton lithosphericmantle. Geochimica et Cosmochimica Acta, vol.59, no.21, pp.4539-4556, Nov1995 doi:10.1016/0016-7037(95)99266-J