Sample 87-131

NavDat sample number 57169 · DIORITE

Sample

Sample ID	87-131
Rock name	DIORITE
Rock type	PLUTONIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	46.3322
Longitude	-121.87
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
20		15	25

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	62.67		WT%	XRF
TIO2	0.89		WT%	XRF
AL2O3	16.71		WT%	XRF
FEO	5.84		WT%	XRF
MNO	0.09		WT%	XRF
MGO	2.7		WT%	XRF
CAO	5.25		WT%	XRF
NA2O	4.36		WT%	XRF
K2O	1.25		WT%	XRF
P2O5	0.25		WT%	XRF

References

Swanson, Donald A (1992) Geologic map of the McCoy Peak Quadrangle, southern Cascade Range, Washington. Open-File Report - U. S. Geological Survey. 1992.