Sample HM1-4

NavDat sample number 125513 · LAMPROITE

Sample

Sample ID	HM1-4
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	221		PPM	XRF
SR	3750		PPM	ICPAES
PB	29.65		PPM	XRF
SM	29		PPM	ICPAES
ND	242		PPM	ICPAES
SR87_SR86	0.705237			MS
ND143_ND144	0.511832			MS
U	3.1		PPM	INAA
TH	11.8		PPM	INAA
CS	2.21		PPM	INAA
TA	2.4		PPM	INAA
HF	36.3		PPM	INAA
PB206_PB204	17.302			MS
PB207_PB204	15.466			MS
PB208_PB204	37.153			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