Sample 82-91a

NavDat sample number 93479 · DACITE

Sample

Sample ID	82-91a
Rock name	DACITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Collected by	Grove and others

Location

Latitude	41.4723
Longitude	-122.131
Location	Hotlum cone
State / province	California

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0		0.002	0.006

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	63.14		WT%	XRF
TIO2	0.57		WT%	XRF
AL2O3	16.88		WT%	XRF
FE2O3	1.54		WT%	XRF
FEO	2.43		WT%	XRF
MNO	0.07		WT%	XRF
MGO	3.59		WT%	XRF
CAO	5.89		WT%	XRF
NA2O	4.11		WT%	XRF
K2O	1.18		WT%	XRF
P2O5	0.17		WT%	XRF
LOI	0.3		WT%	XRF
SR	960		PPM	XRF
BA	307		PPM	XRF
CE	22		PPM	XRF
LA	12		PPM	XRF
GA	22		PPM	XRF
NB	2		PPM	XRF
RB	24		PPM	XRF
Y	11		PPM	XRF
ZR	125		PPM	XRF
ZN	48		PPM	XRF
CU	27		PPM	XRF
CR	72		PPM	XRF
NI	52		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