Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy): implications for palaeoenvironmental changes

TY - JOUR

T1 - Organic carbon isotope values from the Late Permian Seis/Siusi succession (Dolomites, Italy)

T2 - implications for palaeoenvironmental changes

AU - Siegert, Susann

AU - Kraus, Sonja H.

AU - Mette, Wolfgang

AU - Struck, Ulrich

AU - Korte, Christoph

PY - 2011/8

Y1 - 2011/8

N2 - The Permian-Triassic boundary is marked by a globally prominent negative carbon isotope excursion traceable in marine carbonates and organic matter. In the shallow marine carbonate succession at Seis/Siusi (Dolomites, Italy), the d13Ccarb and d13Corg signatures follow the general Permian-Triassic boundary carbon isotope trend, but the d13Corg values are slightly less depleted in 13C in two episodes representing restricted lagoonal environments and in the period around the Tesero Oolite Horizon. This isotopically less depleted organic matter in the lagoons is interpreted to be most likely caused by poor oxygen ventilation and/or slightly modified salinity which may have led to restricted bioproductivity and increased hence the relative amounts of continental-sourced organic matter. In addition, elevated riverine influx and supply of terrestrial organic matter, perhaps triggered by a wet period, might be the cause for the relatively less depleted 13C in the organic matter around the Tesero Oolite Horizon and in overlying sediments.

AB - The Permian-Triassic boundary is marked by a globally prominent negative carbon isotope excursion traceable in marine carbonates and organic matter. In the shallow marine carbonate succession at Seis/Siusi (Dolomites, Italy), the d13Ccarb and d13Corg signatures follow the general Permian-Triassic boundary carbon isotope trend, but the d13Corg values are slightly less depleted in 13C in two episodes representing restricted lagoonal environments and in the period around the Tesero Oolite Horizon. This isotopically less depleted organic matter in the lagoons is interpreted to be most likely caused by poor oxygen ventilation and/or slightly modified salinity which may have led to restricted bioproductivity and increased hence the relative amounts of continental-sourced organic matter. In addition, elevated riverine influx and supply of terrestrial organic matter, perhaps triggered by a wet period, might be the cause for the relatively less depleted 13C in the organic matter around the Tesero Oolite Horizon and in overlying sediments.

U2 - 10.1002/mmng.201100008

DO - 10.1002/mmng.201100008

M3 - Journal article

SN - 2193-0066

VL - 14

SP - 207

EP - 217

JO - Fossil Record

JF - Fossil Record

IS - 2

ER -