Sample s_MA-477

NavDat sample number 33680 · ANDESITE

Sample

Sample ID	s_MA-477
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	THE SPEARHEAD

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.474		0.4266	0.5214

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
K2O	2.025		WT%	AES
AR40	1.38E-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