a - Sample and mineral being analyzed. a is apatite, z is
zircon. b - Rs is the radius of a sphere with an equivalent
alpha ejection correction as the grain, calculated using equation A6 in
Cooperdock et al., (2019) c - Concentrations of He, U, Th and
Sm computed from their absolute amounts and the estimated dimensional
mass reported in Table 3 d - 2s propagated analytical
uncertainty on the U, Th, Sm, and He measurements e - eU is
effective uranium concentration. Calculated as U + 0.238*Th + 0.0012*Sm
after Cooperdock et al., (2019) f - Uncertainty on eU estimated
at 15% of the eU value g - Uncorrected date is calculated
iteratively using the 4He production equation defined as equation 1 in
Wolf et al. (1998) and assuming secular equilibrium. h - 2s
propagated analytical uncertainty on the U, Th, Sm and He measurements
i - The combined alpha-ejection correction for the crystal
calculated from the isotope specific FT corrections in Table 2, the
proportion of U and Th contributing to 4He production, and assuming
homogeneous parent isotope distributions. j - The corrected
date is calculated iteratively using the absolute values of He, U, Th
and Sm in Table 2, the isotope specific FT corrections in Table 2, and
equation 34 in Ketcham at al., (2011) assuming secular equilibrium.
k - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements. MW Avg - Inverse variance weighted
mean; mean ages and uncertainty do not include grains that were parsed
due to Z-scores > 2- |
a - Sample and mineral
being analyzed. a is apatite, z is zircon. b - Rs is the radius
of a sphere with an equivalent alpha ejection correction as the grain,
calculated using equation A6 in Cooperdock et al., (2019) c -
Concentrations of He, U, Th and Sm computed from their absolute amounts
and the estimated dimensional mass reported in Table 3 d - 2s
propagated analytical uncertainty on the U, Th, Sm, and He measurements
e - eU is effective uranium concentration. Calculated as U +
0.238*Th + 0.0012*Sm after Cooperdock et al., (2019) f -
Uncertainty on eU estimated at 15% of the eU value g -
Uncorrected date is calculated iteratively using the 4He production
equation defined as equation 1 in Wolf et al. (1998) and assuming
secular equilibrium. h - 2s propagated analytical uncertainty
on the U, Th, Sm and He measurements i - The combined
alpha-ejection correction for the crystal calculated from the isotope
specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |
a - Sample and
mineral being analyzed. a is apatite, z is zircon. b - Rs is
the radius of a sphere with an equivalent alpha ejection correction as
the grain, calculated using equation A6 in Cooperdock et al., (2019)
c - Concentrations of He, U, Th and Sm computed from their
absolute amounts and the estimated dimensional mass reported in Table 3
d - 2s propagated analytical uncertainty on the U, Th, Sm, and
He measurements e - eU is effective uranium concentration.
Calculated as U + 0.238*Th + 0.0012*Sm after Cooperdock et al., (2019)
f - Uncertainty on eU estimated at 15% of the eU value
g - Uncorrected date is calculated iteratively using the 4He
production equation defined as equation 1 in Wolf et al. (1998) and
assuming secular equilibrium. h - 2s propagated analytical
uncertainty on the U, Th, Sm and He measurements i - The
combined alpha-ejection correction for the crystal calculated from the
isotope specific FT corrections in Table 2, the proportion of U and Th
contributing to 4He production, and assuming homogeneous parent isotope
distributions. j - The corrected date is calculated iteratively
using the absolute values of He, U, Th and Sm in Table 2, the isotope
specific FT corrections in Table 2, and equation 34 in Ketcham at al.,
(2011) assuming secular equilibrium. k - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements.
MW Avg - Inverse variance weighted mean; mean ages and
uncertainty do not include grains that were parsed due to Z-scores
> 2- |
a - Sample and mineral being analyzed. a is
apatite, z is zircon. b - Rs is the radius of a sphere with an
equivalent alpha ejection correction as the grain, calculated using
equation A6 in Cooperdock et al., (2019) c - Concentrations of
He, U, Th and Sm computed from their absolute amounts and the estimated
dimensional mass reported in Table 3 d - 2s propagated
analytical uncertainty on the U, Th, Sm, and He measurements e
- eU is effective uranium concentration. Calculated as U + 0.238*Th +
0.0012*Sm after Cooperdock et al., (2019) f - Uncertainty on eU
estimated at 15% of the eU value g - Uncorrected date is
calculated iteratively using the 4He production equation defined as
equation 1 in Wolf et al. (1998) and assuming secular equilibrium.
h - 2s propagated analytical uncertainty on the U, Th, Sm and
He measurements i - The combined alpha-ejection correction for
the crystal calculated from the isotope specific FT corrections in Table
2, the proportion of U and Th contributing to 4He production, and
assuming homogeneous parent isotope distributions. j - The
corrected date is calculated iteratively using the absolute values of
He, U, Th and Sm in Table 2, the isotope specific FT corrections in
Table 2, and equation 34 in Ketcham at al., (2011) assuming secular
equilibrium. k - 2s propagated analytical uncertainty on the U,
Th, Sm, and He measurements. MW Avg - Inverse variance
weighted mean; mean ages and uncertainty do not include grains that were
parsed due to Z-scores > 2- |