Sample s_2

NavDat sample number 39574 · DACITE

Sample

Sample ID	s_2
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
0.0005		0.00045	0.00055

Analyses

Volcanic glass

Item	Value	Std. dev.	Unit	Method
SIO2	74.79		WT%	UNKNOWN
TIO2	0.21		WT%	UNKNOWN
AL2O3	13.87		WT%	UNKNOWN
FEOT	1.65		WT%	UNKNOWN
CAO	1.69		WT%	UNKNOWN
MGO	0.3		WT%	UNKNOWN
MNO	0.04		WT%	UNKNOWN
K2O	2.29		WT%	UNKNOWN
NA2O	5.17		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.