Volcanism of the Central Atlantic magmatic province as the trigger of environmental and biotic changes around the Triassic-Jurassic boundary
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Tartalom: http://specialpapers.gsapubs.org/content/early/2014/08/21...
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Gyűjtemény: Status = Published

Type = Article
Cím:
Volcanism of the Central Atlantic magmatic province as the trigger of environmental and biotic changes around the Triassic-Jurassic boundary
Létrehozó:
Pálfy, József
Kocsis, Tibor Ádám
Dátum:
2014
Téma:
QE Geology / földtudományok
Tartalmi leírás:
In the last decade, major advances have been made in our understanding of
the end-Triassic mass extinction, related environmental changes, and volcanism of
the Central Atlantic magmatic province. Studies of various fossil groups and synoptic
analyses of global diversity document the extinction and subsequent recovery.
The concomitant environmental changes are manifested in a series of carbon isotope
excursions (CIE), suggesting perturbations in the global carbon cycle. Besides
the earlier-recognized initial and main negative anomalies, a more complex picture
is emerging with other CIEs, both negative and positive, prior to and following the
Triassic-Jurassic boundary. The source of isotopically light carbon remains debated
(methane from hydrate dissociation vs. thermogenic methane), but either process is
capable of amplifying an initial warming, resulting in runaway greenhouse conditions.
Excess CO2 entering the ocean causes acidifi cation, an effective killing mechanism
for heavily calcifi ed marine biota that appears implicated in the reef crisis.
The spatial and temporal extent of Central Atlantic magmatic province volcanism is
established through a growing data set of radiometric ages. Since the Central Atlantic
magmatic province is one of the largest Phanerozoic large igneous provinces, volcanic
CO2-driven warming is plausible as a key factor in the chain of Triassic-Jurassic
boundary events. Greenhouse warming may have been punctuated by short-term
cooling episodes due to H2S emission and production of sulfate aerosols, a process
more diffi cult to trace in the stratigraphic record. Taken together, recently generated
data signifi cantly increase the support for Central Atlantic magmatic province
volcanism as a viable trigger for the environmental and biotic changes around the
Triassic-Jurassic boundary.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Pálfy, József and Kocsis, Tibor Ádám (2014) Volcanism of the Central Atlantic magmatic province as the trigger of environmental and biotic changes around the Triassic-Jurassic boundary. Special Papers, 505. ISSN 0072-1077
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