Sample s_97-12

NavDat sample number 43395 · ANDESITE

Sample

Sample ID	s_97-12
Rock name	ANDESITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Texture	PORPHYRITIC
Comment	LOWER UNIT

Location

Latitude	46.87
Longitude	-121.758
Location	Burroughs Mountain Lava Flow
State / province	Washington
Location comment	North Vertical Section

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.496		0.489	0.503

Analyses

Mineral

Item	Value	Std. dev.	Unit	Method
SIO2	49.9		WT%	EPMA
TIO2	0.83		WT%	EPMA
AL2O3	4.66		WT%	EPMA
CR2O3	0.08		WT%	EPMA
FEO	11.5		WT%	EPMA
CAO	19.4		WT%	EPMA
MGO	12.8		WT%	EPMA
MNO	0.35		WT%	EPMA
NA2O	0.52		WT%	EPMA

References

Stockstill, Karen R; Vogel, Thomas A; Sisson, Thomas W (2003) Origin and emplacement of the andesite of Burroughs Mountain, a zoned, large-volume lava flow at Mount Rainier, Washington, USA. Journal of Volcanology and Geothermal Research. 119; 1-4, Pages 275-296. 2003. doi:10.1016/S0377-0273(02)00358-X