Sample s_MA-719

NavDat sample number 33714 · ANDESITE

Sample

Sample ID	s_MA-719
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.206
Longitude	-121.49
Location	CASCADES / HIGH CASCADES / NORTHWESTERN CASCADES / MOUNT ADAMS / PACIFIC OCEAN
State / province	WASHINGTON
Location comment	MD SPRING

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.622		0.5598	0.6842

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
K2O	1.111		WT%	AES
AR40	9.95E-13		MOLE/G	MS-ID

References

Hildreth, Wes; Lanphere, Marvin A (1994) Potassium-argon geochronology of a basalt-andesite-dacite arc system; the Mount Adams volcanic field, Cascade Range of southern Washington. Geological Society of America Bulletin. 106; 11, Pages 1413-1429. 1994. doi:10.1130/0016-7606(1994)106<1413:PAGOAB>2.3.CO;2