Sample 83-50

NavDat sample number 93501 · DACITE

Sample

Sample ID	83-50
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Grove and others

Location

Latitude	41.4367
Longitude	-122.22
Location	Shastina cone
State / province	California

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.01		0.0094	0.01

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	63.38		WT%	XRF
TIO2	0.6		WT%	XRF
AL2O3	16.13		WT%	XRF
FE2O3	1.78		WT%	XRF
FEO	2.41		WT%	XRF
MNO	0.07		WT%	XRF
MGO	3.7		WT%	XRF
CAO	6.09		WT%	XRF
NA2O	4.58		WT%	XRF
K2O	1.14		WT%	XRF
P2O5	0.2		WT%	XRF
LOI	0.34		WT%	XRF
SR	933		PPM	XRF
BA	320		PPM	XRF
CE	21		PPM	XRF
LA	18		PPM	XRF
GA	26		PPM	XRF
NB	3		PPM	XRF
RB	22		PPM	XRF
Y	12		PPM	XRF
ZR	124		PPM	XRF
ZN	71		PPM	XRF
CU	45		PPM	XRF
CR	94		PPM	XRF
NI	67		PPM	XRF

References

Grove, Timothy L; Baker, Michael B; Price, Richard C; Parman, StephenW; Elkins-Tanton, Linda T; Chatterjee, Nilanjan; Muentener, Othmar (2005) Magnesian andesite and dacite lavas from Mt. Shasta, NorthernCalifornia; products of fractional crystallization of H (sub 2) O-richmantle melts. Contributions to Mineralogy and Petrology, vol.148, no.5, pp.542-565,Jan 2005 doi:10.1007/s00410-004-0619-6