Sample 82-92a

NavDat sample number 93548 · DACITE

Sample

Sample ID	82-92a
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Grove and others

Location

Latitude	41.4677
Longitude	-122.185
Location	Sargents Ridge cone
State / province	California

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0.19		0.13	0.25

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	66.38		WT%	XRF
TIO2	0.45		WT%	XRF
AL2O3	16.37		WT%	XRF
FEO	3.59		WT%	XRF
MNO	0.06		WT%	XRF
MGO	1.89		WT%	XRF
CAO	4.18		WT%	XRF
NA2O	4.1		WT%	XRF
K2O	1.94		WT%	XRF
P2O5	0.13		WT%	XRF
LOI	1.3		WT%	XRF
SR	478		PPM	XRF
BA	475		PPM	XRF
CE	24		PPM	XRF
LA	14		PPM	XRF
GA	22		PPM	XRF
NB	4		PPM	XRF
RB	56		PPM	XRF
Y	11		PPM	XRF
ZR	138		PPM	XRF
ZN	50		PPM	XRF
CU	15		PPM	XRF
CR	19		PPM	XRF
NI	11		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