DOI: 10.1016/j.palaeo.2015.03.034
论文题名: Carbon isotope (δ13C) differences between Late Cretaceous ammonites and benthic mollusks from Antarctica
作者: Tobin T.S. ; Ward P.D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 428 起始页码: 50
结束页码: 57
语种: 英语
英文关键词: Ammonite
; Benthic
; Carbon Isotope
; Cretaceous
; K-Pg
; K-T
; Mollusk
; Paleogene
; δ13C
英文摘要: Ammonites are one of the most common fossils of the Mesozoic, but there is little consensus on their mode of life. Isotopic studies have been used to reconstruct their preferred water temperature from δ18O measurements, but δ13C values have more ambiguous interpretations. Previous studies have recorded population differences in δ13C values between ammonite and benthic organisms without explaining the cause in detail. Here we examine a molluscan community from Seymour Island, Antarctica and find a 4‰ carbon isotope offset between ammonites and other benthic mollusks. The most likely cause of this anomaly is an increased metabolic carbon contribution to ammonite shell material when compared with other mollusks, but we cannot rule out the possibility of a methane seep contribution. Increased respired CO2 production could be generated by a more active lifestyle and increased energy demands, which may have increased the susceptibility of ammonites to the end Cretaceous mass extinction. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68940
Appears in Collections: 过去全球变化的重建
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作者单位: Lake Superior State University, Sault Ste. Marie, MI, United States; University of Washington, Seattle, WA, United States
Recommended Citation:
Tobin T.S.,Ward P.D.. Carbon isotope (δ13C) differences between Late Cretaceous ammonites and benthic mollusks from Antarctica[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,428