Zircon U-Pb Geochronology Links the End-Triassic Extinction with the Central Atlantic Magmatic Province

“…Robust biotic recovery, which initially occurred in the form of bio-siliceous deposition 36 , did not begin until Hg concentrations returned to pre-extinction levels and Hg-MIF re-appeared, indicating the cessation of major CAMP volcanism. This inferred timing of recovery contrasts with previous suggestions 3 that the recovery was underway as CAMP was still erupting.…”

“…4 , 5 ). Another 3 analyses were slightly but resolvably older, compatible with previous reports 2 , 6 , 10 .

Figure 4 206 Pb/ 238 U weighted mean ages for the NMB03 sample using different Th/U [magma] correction values.

…”

“…Sample NJ1 from the well‐studied Palisades sill located in New Jersey yielded in situ apatite U‐Pb bulk and 3‐s integrated Tera‐Wasserburg intercept dates of 201.4 ± 8.3 Ma and 201.0 ± 6.0 Ma, respectively. These new in situ apatite U‐Pb age determinations are consistent with previous plagioclase and biotite 40 Ar/ 39 Ar and zircon U‐Pb age determinations of the Palisades sill of ∼203–195 Ma and 201.520 ± 0.034 Ma, respectively (Blackburn et al., 2013; Marzoli et al., 2011). The concurrence of these ages further confirms that in situ apatite U‐Pb geochronology is a robust tool to determine the crystallization ages of mafic to intermediate rocks (Figure 1 and Table 1).…”

“…Robust biotic recovery, which initially occurred in the form of bio-siliceous deposition 36 , did not begin until Hg concentrations returned to pre-extinction levels and Hg-MIF re-appeared, indicating the cessation of major CAMP volcanism. This inferred timing of recovery contrasts with previous suggestions 3 that the recovery was underway as CAMP was still erupting.…”

“…4 , 5 ). Another 3 analyses were slightly but resolvably older, compatible with previous reports 2 , 6 , 10 .

Figure 4 206 Pb/ 238 U weighted mean ages for the NMB03 sample using different Th/U [magma] correction values.

…”

“…Sample NJ1 from the well‐studied Palisades sill located in New Jersey yielded in situ apatite U‐Pb bulk and 3‐s integrated Tera‐Wasserburg intercept dates of 201.4 ± 8.3 Ma and 201.0 ± 6.0 Ma, respectively. These new in situ apatite U‐Pb age determinations are consistent with previous plagioclase and biotite 40 Ar/ 39 Ar and zircon U‐Pb age determinations of the Palisades sill of ∼203–195 Ma and 201.520 ± 0.034 Ma, respectively (Blackburn et al., 2013; Marzoli et al., 2011). The concurrence of these ages further confirms that in situ apatite U‐Pb geochronology is a robust tool to determine the crystallization ages of mafic to intermediate rocks (Figure 1 and Table 1).…”

“…Robust biotic recovery, which initially occurred in the form of bio-siliceous deposition 36 , did not begin until Hg concentrations returned to pre-extinction levels and Hg-MIF re-appeared, indicating the cessation of major CAMP volcanism. This inferred timing of recovery contrasts with previous suggestions 3 that the recovery was underway as CAMP was still erupting.…”

“…4 , 5 ). Another 3 analyses were slightly but resolvably older, compatible with previous reports 2 , 6 , 10 .

Figure 4 206 Pb/ 238 U weighted mean ages for the NMB03 sample using different Th/U [magma] correction values.

…”

“…Sample NJ1 from the well‐studied Palisades sill located in New Jersey yielded in situ apatite U‐Pb bulk and 3‐s integrated Tera‐Wasserburg intercept dates of 201.4 ± 8.3 Ma and 201.0 ± 6.0 Ma, respectively. These new in situ apatite U‐Pb age determinations are consistent with previous plagioclase and biotite 40 Ar/ 39 Ar and zircon U‐Pb age determinations of the Palisades sill of ∼203–195 Ma and 201.520 ± 0.034 Ma, respectively (Blackburn et al., 2013; Marzoli et al., 2011). The concurrence of these ages further confirms that in situ apatite U‐Pb geochronology is a robust tool to determine the crystallization ages of mafic to intermediate rocks (Figure 1 and Table 1).…”