Sample s_7

NavDat sample number 39571 · DACITE

Sample

Sample ID	s_7
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
0.0035		0.00315	0.00385

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	65.94		WT%	EPMA
TIO2	0.65		WT%	EPMA
AL2O3	17.55		WT%	EPMA
FEOT	3.97		WT%	EPMA
CAO	4.55		WT%	EPMA
MGO	1.33		WT%	EPMA
MNO	0.08		WT%	EPMA
K2O	1.39		WT%	EPMA
NA2O	4.46		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.