Siberian Trap volcanism, global warming and the Permian-Triassic mass extinction: New insights from Armenian Permian-Triassic sectionsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 июля 2020 г.
Аннотация:Permian-Triassic boundary sections from
Armenia were studied for carbon isotopes
of carbonates as well as oxygen isotopes of
conodont apatite in order to constrain the
global significance of earlier reported variations
in the isotope proxies and elaborate
the temporal relationship between carbon
cycle changes, global warming and Siberian
Trap volcanism. Carbon isotope records of
the Chanakhchi and Vedi II sections show
a 3–5‰ negative excursion that start in the
Clarkina nodosa (C. yini) conodont Zone (latest
Permian) with minimum values recorded
in Hindeodus parvus to Isarcicella isarcica
conodont zones (earliest Triassic). Sea surface
temperatures (SST) reconstructed from
oxygen isotopes of conodont apatite increase
by 8–10 °C over an extrapolated time interval
of ~39 ka with the onset of global warming
occurring in the C. iranica (C. meishanensis)
Zone of the latest Permian. Climate warming
documented in the Armenian sections
is comparable to published time-equivalent
shifts in SST in Iran and South China suggesting
that this temperature change represents
a true global signature. By correlating
the Armenian and Iranian section with the
radiometrically well-dated Meishan GSSP
(Global Stratotype Section and Point) section
(South China), the negative shift in δ13C is
estimated to have occurred 12–128 ka prior
to the onset of global warming. This temporal
offset is unexpected given the synchrony
in changes in atmospheric CO2 and global
temperature as seen in Pleistocene ice core
records.