Sample s_SH-114

NavDat sample number 16331 · DACITE

Sample

Sample ID	s_SH-114
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	subaerial

Location

Latitude	46.1436
Longitude	-122.202
Location	Mount St. Helens
State / province	Washington
Location comment	Castle Creek Unit

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0		0	0.01	Holocene

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	62.97		WT%	EPMA
TIO2	0.66		WT%	EPMA
AL2O3	17.66		WT%	EPMA
FEOT	4.73		WT%	EPMA
CAO	5.39		WT%	EPMA
MGO	2.2		WT%	EPMA
MNO	0.07		WT%	EPMA
K2O	1.24		WT%	EPMA
NA2O	4.54		WT%	EPMA
P2O5	0.13		WT%	EPMA
SIO2	62.27		WT%	XRF
TIO2	0.72		WT%	XRF
AL2O3	17.68		WT%	XRF
FE2O3T	5.45		WT%	XRF
CAO	5.28		WT%	XRF
MGO	2.43		WT%	XRF
MNO	0.08		WT%	XRF
K2O	1.22		WT%	XRF
NA2O	4.43		WT%	XRF
P2O5	0.13		WT%	XRF

References

Rutherford, Malcolm J; Devine, Joseph D (1988) The May 18, 1980, eruption of Mount St. Helens; 3, Stability and chemistry of amphibole in the magma chamber. Journal of Geophysical Research, B, Solid Earth and Planets. 93; 10, Pages 11,949-11,959. 1988. doi:10.1029/JB093iB10p11949