Unravelling the oxygen isotope signal (δ18O) of rodent teeth from northeastern Iberia, and implications for past climate reconstructions

QUATERNARY SCIENCE REVIEWS

卷:218

Article

Fernandez-Garcia, Monica^1,2  Royer, Aurelien³  Manuel Lopez-Garcia, Juan⁴  Bennasar, Maria^4,5  Goedert, Jean⁶  Fourel, Francois⁷  Julien, Marie-Anne²  Banuls-Cardona, Sandra¹  Rodriguez-Hidalgo, Antonio^8,9  Vallverdu, Josep^4,5  Lecuyer, Christophe^10,11,12 

[1] Univ Ferrara UNIFE, Dipartimento Studi Umanist, Sez Sci Preistor & Antropol, C So Ercole I dEste 32, I-44121 Ferrara, Italy

[2] Sorbonne Univ, HNHP, UMR CNRS 7194, MNHN, 1 Rue Rene Panhard, F-75013 Paris, France

[3] Univ Bourgogne Franche Comte, Biogeosci, UMR CNRS 6282, 6 Blvd Gabriel, F-21000 Dijon, France

[4] Inst Catala Paleoecol Humana & Evolucio Social IP, Zona Educ 4,Campus Sescelades URV Edif W3, Tarragona 43007, Spain

[5] URV, Area Prehist, Av Catalunya 35, Tarragona 43002, Spain

[6] Univ Bordeaux, PACEA, UMR CNRS 5199, Batiment B18,Allee Geoffroy St Hilaire,CS 50023, F-33615 Pessac, France

[7] Univ Claude Bernard Lyon 1, LEHNA, UMR CNRS 5023, ENTPE, F-69622 Villeurbanne, France

[8] Univ Complutense Madrid, Prehist Ancient Hist & Archaeol Dept, Madrid 28040, Spain

[9] IDEA, C Covarrubias 36, Madrid 28010, Spain

[10] Univ Claude Bernard Lyon 1, Lab Geol Lyon, UMR CNRS 5276, F-69622 Villeurbanne, France

[11] Ecole Normale Super Lyon, F-69622 Villeurbanne, France

[12] Inst Univ France, Paris, France

关键词: Small mammals;    Stable isotopes;    Geochemistry;    Palaeoclimatology;    Late Pleistocene;    Western Europe;   

DOI  :  10.1016/j.quascirev.2019.04.035

来源: Elsevier

【 摘 要 】

Small mammals, especially rodents, constitute valuable proxies for continental Quaternary environments at a regional and local scale. Recent studies have demonstrated the relation between the stable oxygen isotope composition of the biogenic phosphate from rodent teeth (delta O-18(p)), and the oxygen isotope composition of meteoric waters (delta O-18(mw)), which is related to air temperatures at mid and high latitudes. This work explores the delta O-18(p) of rodent tooth enamel (from Murinae and Arvicolinae subfamilies) to investigate the palaeoenvironmental conditions in northeastern Iberia during Marine Isotope Stage 3 (MIS 3; ca. 60-30 ka). Fourteen new delta O-18(p) analyses from modern samples in conjunction with forty-six delta O-18(p) analyses previously published are used to decipher the isotope record of present-day rodent teeth in this region. Two main factors should be considered in Iberian palaeoenvironmental reconstructions: the singular nature of Iberian delta O-18(mw) records and the potential seasonality bias of small-mammal accumulation. Methodological proposals are made with a view to ensuring the correct interpretation of the delta O-18(p) of small mammals in reconstructing past air temperatures. This methodology is applied to the MIS 3 sequence of the Cova dels Xaragalls site (Vimbodi-Poblet, Tarragona, Spain), where fifty-one delta(18)Oanalyses were performed on wood mouse (Apodemus sylvaticus) lower incisors. A spring-early summer accumulation of small mammals is suggested for the layers at Cova dels Xaragalls. In agreement with previous environmental studies of the site, variations in the delta O-18(p) values suggest slight fluctuations in the climatic conditions throughout the sequence, which are consistent with the stadial-interstadial alternations that characterized MIS 3. Complementary palaeoenvironmental methods determine cooler conditions than nowadays, but within a globally stable climatic period. (C) 2019 Elsevier Ltd. All rights reserved.

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