Carbon-isotope variability of Triassic amber, as compared with wood and leaves (Southern Alps, Italy)

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• 作者：Jacopo Dal Corso^a ; ^{jacopo.dalcorso@unipd.it} ; Nereo Preto^a ; Evelyn Kustatscher^c ; Paolo Mietto^a ; Guido Roghi^b ; Hugh C. Jenkyns^d
• 关键词：Carbon-isotopes ; Amber ; Fossil wood ; Fossil leaves ; Middle-Late Triassic ; Southern Alps
• 刊名：Palaeogeography, Palaeoclimatology, Palaeoecology
• 出版年：2011
• 出版时间：15 March 2011
• 年：2011
• 卷：302
• 期：3-4
• 页码：187-193
• 全文大小：453 K

文摘

The carbon-isotope signatures of Carnian (Late Triassic) amber drops from Rifugio Dibona (Southern Alps, Italy) were studied and compared with that of other Middle-early Late Triassic fossil plant remains, namely wood and leaves. Amber, wood and leaf carbon-isotope data are highly variable within the same beds. δ¹³C_amber values vary by up to 5.4‰ and are enriched by ~ 2.5‰ with respect to associated wood. δ¹³C_wood and δ¹³C_leaf ranges are narrower than that of amber (~ 2–3‰) and the isotopic offset within each bed is similar over time. The high Triassic amber carbon-isotope variability is similar to that of recent resin. Despite the high variability, δ¹³C_wood and δ¹³C_leaf illustrate a Middle-early Late Triassic secular positive trend that is similar to that of marine δ¹³C_inorg data and must record the carbon-isotope evolution of the ocean–atmosphere system.