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タイトル: Environmental and vegetational changes recorded in sedimentary leaf wax n-alkanes across the Cretaceous-Paleogene boundary at Loma Capiro, Central Cuba
著者: Yamamoto, Shinya
Hasegawa, Takashi link image link image
Tada, Ryuji
Goto, Kazuhisa
Reinaldo, Rojas-Consuegra
Diaz-Otero, Consuelo
Garcia-Delgado, Dora E.
Yamamoto, Shinji
Sakuma, Hironobu
Matsui, Takafumi
長谷川, 卓
発行日: 2010年 9月
出版社(者): Elsevier BV
雑誌名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
巻: 295
号: 1-2
開始ページ: 31
終了ページ: 41
キーワード: Cretaceous
Cretaceous-Paleogene boundary
Leaf wax
N-alkane
Paleogene
Stable carbon isotopes
抄録: The stable carbon isotopic compositions (δ13C) and chain-length distribution [ACL and n-C31/(n-C29+n-C31)] of sedimentary leaf wax n-alkanes were investigated across the Cretaceous-Paleogene (K-Pg) boundary at Loma Capiro, Central Cuba, to reconstruct paleoenvironmental changes that are recorded in terrestrial higher plants. The stratigraphic profiles of the n-alkane δ13C values show a negative excursion in the lowermost Paleocene, although its magnitude is much smaller (~0.3‰) than the global signals (1.5 to 2.0‰) in the surface ocean-atmospheric carbon reservoir. Relations between the n-alkane δ13C values and the C31/(C29+C31) ratios exhibit two different trends, suggesting that our δ13C records are likely affected by two types of paleoenvironmental factors in addition to the δ13C variations in the exogenous carbon reservoir. Rare occurrence of terrigenous organic matter that is usually transported by rivers suggests that the n-alkanes at Loma Capiro are likely to have been transported by trade winds, which recorded paleoenvironmental conditions of the northwestern part of the African continent. The n-alkane δ13C values show a parallel decrease with the ACL and C31/(C29+C31) values in the first 37,000yr following the K-Pg boundary. Such decreases are consistent with plant physiological responses to reduced net evaporation, suggesting a possible influence of the impact-induced warm-humid condition in the early Paleocene. In contrast, the n-alkane δ13C values are negatively correlated with the C31/(C29+C31) ratios from 40,000 to 67,000yr after the K-Pg boundary. This time period matches well with that required for the recovery of terrestrial floras from the K-Pg mass extinction to those with diversity equivalent to the late Cretaceous, suggesting that the n-alkane signals are also likely affected by the plant diversification process after the mass extinction. © 2010 Elsevier B.V.
DOI: 10.1016/j.palaeo.2010.05.013
URI: http://hdl.handle.net/2297/25025
関連URI: http://www.elsevier.com/locate/issn/00310182
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(理)

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