Coupling textural and stable-isotope variations in fluvial stromatolites:Comparison of Pleistocene and recent records in NE Spain

作     者：C.Arenas M.C.Osácar L.Auqué C.Sancho 

作者机构：Department of Earth SciencesUniversity of Zaragoza Geotransfer Group and Institute for Research on Environmental Sciences of Aragón(IUCA) 

出 版 物：《Journal of Palaeogeography》 (古地理学报（英文版）)

年 卷 期：2019年第8卷第2期

页      面：150-169页

核心收录：

学科分类：0303[法学-社会学] 0710[理学-生物学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0813[工学-建筑学] 0833[工学-城乡规划学] 

基　　金：funded by projects CGL2009–09216/CLI and CGL2013–42867 of the Spanish Government and European Regional Funds fits the objectives of the research groups Geotransfer,Procesos Geoambientales y Cambio Global and Modelización Geoquímica(Aragón Government and University of Zaragoza,and European Regional Funds) part of the activities of the Geotransfer scientific group(Aragón Government,Operating Program FEDER Aragón 2014–2020) 

主　　题：Tufa Recent and ancient stromatolites Stable isotopes Biotic and abiotic laminae Intra-annual and inter-annual water temperature variations 

摘      要：Textural and stable isotopic features of two middle Pleistocene fluvial stromatolite profiles are compared to a recent stromatolite,both formed in the River Piedra system(NE Spain),to test the reliability of climatic,hydrologic and depositional information derived from ancient *** Pleistocene stromatolites formed in a multi-domed,highly-inclined *** recent stromatolite also formed in a highly-inclined cascade of the River Piedra,the sedimentary conditions of which were periodically examined between the years 2000 and *** Pleistocene stromatolites are formed of an alternation of 1) thin large-crystal laminae(type A),with elongated crystals up to 1 mm long,and 2) thick small-crystal laminae(type B),consisting of cyanobacterial fan-and bushshaped *** textural and isotopic comparison with the recent stromatolite shows that each A–B couplet corresponds to one *** type-A laminae are comparable to the macrocrystalline laminae that occur in the cool-period deposits of the recent stromatolite,and the type-B laminae are comparable to the warm-period deposits of the recent *** temperatures(Tw),calculated from δ^(18)O_(calcite) and present measures of δ^(18)O_(water),were similar in the Pleistocene and recent specimens,and close to the measured river ***,the Pleistocene stromatolites formed not far from isotopic equilibrium,as did the recent *** Pleistocene δ^(18) O_(calcite) biannual oscillation is wider in amplitude than in the recent stromatolite,which suggests larger differences in Tw through the year in the Pleistocene than at *** Pleistocene δ^(13)C_(calcite) does not show any pattern;and the values are slightly higher than the recent *** co-evolution of δ^(18)O and δ^(13)C is parallel in the Pleistocene stromatolites,matching the recent stromatolite *** results and their comparison with other ancient examples prove that textural and isotopic features in ancient stromatolites