Sample Mafic-poor units of Tuffs and Lavas of Area 20

NavDat sample number 17030 · PYROCLASTIC FLOW

Sample

Sample ID	Mafic-poor units of Tuffs and Lavas of Area 20
Rock name	PYROCLASTIC FLOW
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	Averages determined by analysis of pumice, vitrophyres, and devitrified interiors of ash flow tuffs and lava flows; additional data from Quinlivan and Byers 1977, Lipman et al. 1966, Spengler et al. 1981, Zielinski 1983, Scott and Castellanos 1984, and Broxton et al. 1986

Latitude	37.2
Longitude	-116.5
Location	N side of TM-OV
State / province	Nevada
Volcanic field	Timber Mountain- Oasis Valley Caldera Complex

Age (Ma)	Error	Min	Max	Geologic age	Dated by
13.75		12.375	15.125

Item	Value	Unit	Method
SIO2	77.3	WT%	XRF
TIO2	0.08	WT%	XRF
AL2O3	12.5	WT%	XRF
FEOT	0.79	WT%	XRF
MNO	0.6	WT%	XRF
MGO	0.1	WT%	XRF
CAO	0.51	WT%	XRF
NA2O	3.47	WT%	XRF
K2O	5.14	WT%	XRF
P2O5	-0.01	WT%	XRF
SC	2.5	PPM	INAA
CO	0.22	PPM	INAA
ARSENIC	2.5	PPM	INAA
RB	169	PPM	INAA
SB	0.31	PPM	INAA
CS	6.32	PPM	INAA
BA	80	PPM	INAA
HF	3.8	PPM	INAA
TA	1.4	PPM	INAA
TH	23.2	PPM	INAA
U	4.4	PPM	INAA
LA	28	PPM	INAA
CE	64	PPM	INAA
ND	24	PPM	INAA
SM	5.5	PPM	INAA
EU	0.28	PPM	INAA
TB	0.68	PPM	INAA
DY	4.8	PPM	INAA
YB	2.7	PPM	INAA
LU	0.37	PPM	INAA