Massive volcanism at the Permian-Triassic boundary and its impact on the isotopic composition of the ocean and atmosphere
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Massive volcanism at the Permian-Triassic boundary and its impact on the isotopic composition of the ocean and atmosphere. / Korte, Christoph; Pande, P.; Kalia, P.; Kozur, H.W.; Joachimski, M.M.; Oberhänsli, H.
In: Journal of Asian Earth Sciences, Vol. 37, No. 4, 2010, p. 293-311.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Massive volcanism at the Permian-Triassic boundary and its impact on the isotopic composition of the ocean and atmosphere
AU - Korte, Christoph
AU - Pande, P.
AU - Kalia, P.
AU - Kozur, H.W.
AU - Joachimski, M.M.
AU - Oberhänsli, H.
PY - 2010
Y1 - 2010
N2 - Bulk carbonate and conodonts from three Permian-Triassic (P-T) boundary sections at Guryul Ravine (Kashmir), Abadeh (central Iran) and Pufels/Bula/Bulla (Italy) were investigated for d13C and d18O. Carbon isotope data highlight environmental changes across the P-T boundary and show the following features: (1) a gradual decrease of 4‰ to more than 7‰ starting in the Late Permian (Changhsingian) C. bachmanni Zone, with two superimposed transient positive excursions in the C. meishanensis-H. praeparvus and the M. ultima-S. ? mostleri Zones; (2) two d13C minima, the first at the P-T boundary and a higher, occasionally double-minimum in the lower I. isarcica Zone. It is unlikely that the short-lived phenomena, such as a breakdown in biological productivity due to catastrophic mass extinction, a sudden release of oceanic methane hydrates or meteorite impact(s), could have been the main control on the latest Permian carbon isotope curve because of its prolonged (0.5 Ma) duration, gradual decrease and the existence of a >1‰ positive shift at the main extinction horizon. The P-T boundary d13C trend matches in time and magnitude the eruption of the Siberian Traps and other contemporaneous volcanism, suggesting that volcanogenic effects, such as outgassed CO2 from volcanism and, even more, thermal metamorphism of organic-rich sediments, as the likely cause of the negative trend.
AB - Bulk carbonate and conodonts from three Permian-Triassic (P-T) boundary sections at Guryul Ravine (Kashmir), Abadeh (central Iran) and Pufels/Bula/Bulla (Italy) were investigated for d13C and d18O. Carbon isotope data highlight environmental changes across the P-T boundary and show the following features: (1) a gradual decrease of 4‰ to more than 7‰ starting in the Late Permian (Changhsingian) C. bachmanni Zone, with two superimposed transient positive excursions in the C. meishanensis-H. praeparvus and the M. ultima-S. ? mostleri Zones; (2) two d13C minima, the first at the P-T boundary and a higher, occasionally double-minimum in the lower I. isarcica Zone. It is unlikely that the short-lived phenomena, such as a breakdown in biological productivity due to catastrophic mass extinction, a sudden release of oceanic methane hydrates or meteorite impact(s), could have been the main control on the latest Permian carbon isotope curve because of its prolonged (0.5 Ma) duration, gradual decrease and the existence of a >1‰ positive shift at the main extinction horizon. The P-T boundary d13C trend matches in time and magnitude the eruption of the Siberian Traps and other contemporaneous volcanism, suggesting that volcanogenic effects, such as outgassed CO2 from volcanism and, even more, thermal metamorphism of organic-rich sediments, as the likely cause of the negative trend.
U2 - 10.1016/j.jseaes.2009.08.012
DO - 10.1016/j.jseaes.2009.08.012
M3 - Journal article
VL - 37
SP - 293
EP - 311
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
SN - 1367-9120
IS - 4
ER -
ID: 15888477