Sample J87-73

NavDat sample number 30648 · RHYOLITE

Sample

Sample ID	J87-73
Rock name	RHYOLITE
Rock type	PLUTONIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	31.2783
Longitude	-105.475
Location	Round Top; Trans-Pecos
State / province	TEXAS

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
36		32.4	39.6

Analyses

MINERAL

Item	Value	Std. dev.	Unit	Method
PB206_PB204	18.241			TIMS
PB207_PB204	15.49			TIMS
PB208_PB204	38.551			TIMS

References

James, Eric William; Henry, Christopher D (1993) Southeastern extent of the North American Craton in Texas and northern Chihuahua as revealed by Pb isotopes; with Suppl. Data 9310. Geological Society of America Bulletin, vol.105, no.1, pp.116-126, Jan 1993 doi:10.1130/0016-7606(1993)105<0116:SEOTNA>2.3.CO;2