Sample s_MA-992

NavDat sample number 33715 · ANDESITE

Sample

Sample ID	s_MA-992
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	LAUREL

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.631		0.5679	0.6941

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
K2O	2.276		WT%	AES
AR40	2.07E-12		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