Sample MGD 677

NavDat sample number 30680 · TRACHYBASALT

Sample

Sample ID	MGD 677
Rock name	TRACHYBASALT
Rock type	VOLCANIC
Composition	MAFIC
Material	IGNEOUS

Location

Latitude	29.84
Longitude	-103.597
Location	Butcherknife Hill; Big Bend and Christmas Mtns
State / province	TEXAS

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
42		37.8	46.2

Analyses

MINERAL

Item	Value	Std. dev.	Unit	Method
PB206_PB204	18.169			TIMS
PB207_PB204	15.555			TIMS
PB208_PB204	37.805			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