Sample RP-6d

NavDat sample number 4789 · RHYOLITE

Sample

Sample ID	RP-6d
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	70 to 75% aphanitic groundmass of equal proportions of albite and orthoclase, along with quartz; groundmass also contains 2% to 3% opaques; phenocrysts are anorthoclase laths

Latitude	44.4052
Longitude	-103.677
State / province	South Dakota
Volcanic field	Black Hills Tertiary igneous province

Age (Ma)	Error	Min	Max	Geologic age	Dated by
54		50	58

Item	Value	Unit	Method
SIO2	68.23	WT%	NAA
AL2O3	15.87	WT%	NAA
FE2O3	1.9	WT%	NAA
MGO	1.87	WT%	NAA
CAO	1.07	WT%	NAA
NA2O	5.71	WT%	NAA
K2O	4.99	WT%	NAA
TIO2	0.24	WT%	NAA
MNO	0.07	WT%	NAA
BAO	0.05	WT%	NAA
BA	451	PPM	NAA
CE	250.7	PPM	NAA
CO	1.1	PPM	NAA
EU	1.8	PPM	NAA
HF	10.1	PPM	NAA
LA	91.7	PPM	NAA
LU	0.7	PPM	NAA
RB	197.3	PPM	NAA
SC	0.3	PPM	NAA
SM	9.4	PPM	NAA
TH	85.6	PPM	NAA
V	19.3	PPM	NAA
YB	3.7	PPM	NAA