Sample 797-20A

NavDat sample number 13856

Sample

Sample ID	797-20A
Rock type	PLUTONIC
Material	IGNEOUS

Location

Latitude	45.7467
Longitude	-114.447
State / province	Montana
Volcanic field	Challis epizonal plutonics and volcanics

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
50		45	55

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
RB	272.9		PPM	XRF
SR	19.9		PPM	XRF
SR87_SR86	0.74003			TIMS

References

Criss, Robert E; Fleck, Robert J (1987) Petrogenesis, geochronology, and hydrothermal systems of the northern Idaho Batholith and adjacent areas based on (super 18?O/ (super 16?O, D/H, (super 87?Sr/ (super 86?Sr, K-Ar, and (super 40?Ar/ (super 39?Ar studies. U. S. Geological Survey Professional Paper, Report: P 1436, pp.95-137, 1987