Sample s_4

NavDat sample number 39569 · DACITE

Sample

Sample ID	s_4
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	subaerial

Location

Latitude	46.2
Longitude	-122.18
Location	CASCADES / HIGH CASCADES / NORTHWESTERN CASCADES / MOUNT ST. HELENS / PACIFIC OCEAN
State / province	WASHINGTON

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.0024		0.00216	0.00264

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	63.26		WT%	EPMA
TIO2	0.69		WT%	EPMA
AL2O3	18.7		WT%	EPMA
FEOT	4.17		WT%	EPMA
CAO	4.89		WT%	EPMA
MGO	1.99		WT%	EPMA
MNO	0.1		WT%	EPMA
K2O	1.27		WT%	EPMA
NA2O	5.07		WT%	EPMA

References

Gardner, J E; Rutherford, M; Carey, S; Sigurdsson, H (1995) Experimental constraints on pre-eruptive water contents and changing magma storage prior to explosive eruptions of Mount St Helens Volcano. Bulletin of Volcanology. 57; 1, Pages 1-17. 1995.