Sample s_SS-31

NavDat sample number 40994 · ANDESITE

Sample

Sample ID	s_SS-31
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	FUSED SAMPLES

Location

Latitude	44.1
Longitude	-121.75
Location	CASCADES / HIGH CASCADES / NORTHWESTERN CASCADES / SOUTH SISTER / PACIFIC OCEAN
State / province	OREGON
Location comment	MAIN CONE

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	65.4		WT%	EPMA
TIO2	0.92		WT%	EPMA
AL2O3	16		WT%	EPMA
FEOT	5.16		WT%	EPMA
CAO	3.62		WT%	EPMA
MGO	1.35		WT%	EPMA
MNO	0.1		WT%	EPMA
K2O	2.22		WT%	EPMA
NA	4.79		WT%	EPMA
LOI	0.32		WT%	IGN

References

Brophy, J G; Dreher, S T (2000) The origin of composition gaps at South Sister Volcano, central Oregon; implications for fractional crystallization processes beneath active calc-alkaline volcanoes. Journal of Volcanology and Geothermal Research. 102; 3-4, Pages 287-307. 2000. doi:10.1016/S0377-0273(00)00192-X