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2018 ; 8
(1
): 9578
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Precisely dating the Frasnian-Famennian boundary: implications for the cause of
the Late Devonian mass extinction
#MMPMID29934550
Percival LME
; Davies JHFL
; Schaltegger U
; De Vleeschouwer D
; Da Silva AC
; Föllmi KB
Sci Rep
2018[Jun]; 8
(1
): 9578
PMID29934550
show ga
The Frasnian-Famennian boundary records one of the most catastrophic mass
extinctions of the Phanerozoic Eon. Several possible causes for this extinction
have been suggested, including extra-terrestrial impacts and large-scale
volcanism. However, linking the extinction with these potential causes is
hindered by the lack of precise dating of either the extinction or
volcanic/impact events. In this study, a bentonite layer in uppermost-Frasnian
sediments from Steinbruch Schmidt (Germany) is re-analysed using CA-ID-TIMS U-Pb
zircon geochronology in order to constrain the date of the Frasnian-Famennian
extinction. A new age of 372.36?±?0.053?Ma is determined for this bentonite,
confirming a date no older than 372.4?Ma for the Frasnian-Famennian boundary,
which can be further constrained to 371.93-371.78?Ma using a pre-existing Late
Devonian age model. This age is consistent with previous dates, but is
significantly more precise. When compared with published ages of the Siljan
impact crater and basalts produced by large-scale volcanism, there is no apparent
correlation between the extinction and either phenomenon, not clearly supporting
them as a direct cause for the Frasnian-Famennian event. This result highlights
an urgent need for further Late Devonian geochronological and chemostratigraphic
work to better understand the cause(s) of this extinction.