Sample 99-10

NavDat sample number 93523 · DACITE

Sample

Sample ID	99-10
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Grove and others

Location

Latitude	41.3718
Longitude	-122.339
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	64.4		WT%	XRF
TIO2	0.43		WT%	XRF
AL2O3	17.6		WT%	XRF
FE2O3	3.58		WT%	XRF
MNO	0.06		WT%	XRF
MGO	2.07		WT%	XRF
CAO	5.23		WT%	XRF
NA2O	4.32		WT%	XRF
K2O	1.18		WT%	XRF
P2O5	0.19		WT%	XRF
LOI	0.01		WT%	XRF
SR	808		PPM	XRF
BA	272		PPM	XRF
CE	16		PPM	XRF
LA	10		PPM	XRF
GA	20		PPM	XRF
NB	3		PPM	XRF
RB	18		PPM	XRF
Y	8		PPM	XRF
ZR	93		PPM	XRF
ZN	44		PPM	XRF
CU	20		PPM	XRF
CR	8		PPM	XRF
NI	13		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