Recovery from the Late Permian mass extinction was slowed by continued environmental perturbation... more Recovery from the Late Permian mass extinction was slowed by continued environmental perturbations during the Early Triassic. Rapid fluctuations of the Early Triassic marine carbonate carbon isotope record indicate instability in the global carbon cycle, and recent dOapatite studies link elevated temperatures to the prolonged biotic recovery. High temperatures potentially caused enhanced continental weathering that was detrimental to marine ecosystems, but linking weathering rates to temperature has proven difficult. One proxy for weathering is the 87Sr/86Sr of marine carbonate; we present here an 87Sr/86Sr record from an upper Permian–lower Triassic succession near Zal, Iran, that is coupled to a dCcarbonate record. An increase in the rate of 87Sr/86Sr rise from the Dienerian to the Smithian may be linked to elevated continental weathering rates caused by warming during the Smithian. GEOLOGY, September 2014; v. 42; no. 9; p. 1–4; Data Repository item 2014283 | doi:10.1130/G35545.1 ...
The study section is located in northwestern Iran, 30 km south of Julfa, near the village of Zal ... more The study section is located in northwestern Iran, 30 km south of Julfa, near the village of Zal (N38°43′47′′, E45°36′13′′, 1600 m; Fig. 1). The section accumulated as a carbonate platform succession on the Iranian microcontinent during the Early Triassic (Fig. DR1; Sengör, 1984; Besse et al., 1998). The Iranian microcontinent formed part of the Cimmeria terranes separating the Neotethys and Paleotethys oceans (Sengör, 1984; see Fig. DR1). The section represents relatively continuous deposition without evidence of major intraformational hiati (Horacek et al., 2007). The Dienerian is represented by nearly 300 m of strata (Fig. 2), enabling high-resolution sampling through this substage.
Recovery from the Late Permian mass extinction was slowed by continued environmental perturbation... more Recovery from the Late Permian mass extinction was slowed by continued environmental perturbations during the Early Triassic. Rapid fluctuations of the Early Triassic marine carbonate carbon isotope record indicate instability in the global carbon cycle, and recent dOapatite studies link elevated temperatures to the prolonged biotic recovery. High temperatures potentially caused enhanced continental weathering that was detrimental to marine ecosystems, but linking weathering rates to temperature has proven difficult. One proxy for weathering is the 87Sr/86Sr of marine carbonate; we present here an 87Sr/86Sr record from an upper Permian–lower Triassic succession near Zal, Iran, that is coupled to a dCcarbonate record. An increase in the rate of 87Sr/86Sr rise from the Dienerian to the Smithian may be linked to elevated continental weathering rates caused by warming during the Smithian. GEOLOGY, September 2014; v. 42; no. 9; p. 1–4; Data Repository item 2014283 | doi:10.1130/G35545.1 ...
The study section is located in northwestern Iran, 30 km south of Julfa, near the village of Zal ... more The study section is located in northwestern Iran, 30 km south of Julfa, near the village of Zal (N38°43′47′′, E45°36′13′′, 1600 m; Fig. 1). The section accumulated as a carbonate platform succession on the Iranian microcontinent during the Early Triassic (Fig. DR1; Sengör, 1984; Besse et al., 1998). The Iranian microcontinent formed part of the Cimmeria terranes separating the Neotethys and Paleotethys oceans (Sengör, 1984; see Fig. DR1). The section represents relatively continuous deposition without evidence of major intraformational hiati (Horacek et al., 2007). The Dienerian is represented by nearly 300 m of strata (Fig. 2), enabling high-resolution sampling through this substage.
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Papers by Alexa Sedlacek