Sample s_3

NavDat sample number 39575 · DACITE

Sample

Sample ID	s_3
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
0.0018		0.00162	0.00198

Analyses

Volcanic glass

Item	Value	Std. dev.	Unit	Method
SIO2	72.77		WT%	UNKNOWN
TIO2	0.35		WT%	UNKNOWN
AL2O3	14.24		WT%	UNKNOWN
FEOT	2.51		WT%	UNKNOWN
CAO	2.4		WT%	UNKNOWN
MGO	0.56		WT%	UNKNOWN
MNO	0.04		WT%	UNKNOWN
K2O	2.43		WT%	UNKNOWN
NA2O	4.69		WT%	UNKNOWN

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.