000078823 001__ 78823
000078823 005__ 20230914083222.0
000078823 0247_ $$2doi$$a10.1186/s42501-019-0021-y
000078823 0248_ $$2sideral$$a111146
000078823 037__ $$aART-2019-111146
000078823 041__ $$aeng
000078823 100__ $$0(orcid)0000-0002-4212-0524$$aArenas, C.$$uUniversidad de Zaragoza
000078823 245__ $$aCoupling textural and stable-isotope variations in fluvial stromatolites: Comparison of Pleistocene and recent records in NE Spain
000078823 260__ $$c2019
000078823 5060_ $$aAccess copy available to the general public$$fUnrestricted
000078823 5203_ $$aTextural 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 records. The Pleistocene stromatolites formed in a multi-domed, highly-inclined cascade-barrage. The 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 2012. The 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 bush-shaped bodies. The textural and isotopic comparison with the recent stromatolite shows that each A–B couplet corresponds to one year. The 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 stromatolite. Water temperatures (Tw), calculated from d 18 O calcite and present measures of d 18 O water , were similar in the Pleistocene and recent specimens, and close to the measured river Tw. Thus, the Pleistocene stromatolites formed not far from isotopic equilibrium, as did the recent stromatolite. The Pleistocene d 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 present. The Pleistocene d 13 C calcite does not show any pattern; and the values are slightly higher than the recent ones. The co-evolution of d 18 O and d 13 C is parallel in the Pleistocene stromatolites, matching the recent stromatolite behavior. These results and their comparison with other ancient examples prove that textural and isotopic features in ancient stromatolites are useful tools to infer past depositional, climatic and hydrological conditions. Moreover, interpretations from recent fluvial stromatolites can be extrapolated to past environments to help decipher patterns of past processes, in cases where both recent and ancient stromatolites can be compared within one environmental setting. Such comparisons may be used to help interpretations of ancient stromatolites where the modern ones are not available to study.
000078823 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CGL2009-09216-CLI$$9info:eu-repo/grantAgreement/ES/MICINN/CGL2013-42867$$9info:eu-repo/grantAgreement/ES/DGA/E32-17R
000078823 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000078823 590__ $$a2.02$$b2019
000078823 592__ $$a0.68$$b2019
000078823 591__ $$aPALEONTOLOGY$$b15 / 55 = 0.273$$c2019$$dQ2$$eT1
000078823 593__ $$aGeography, Planning and Development$$c2019$$dQ1
000078823 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b111 / 198 = 0.561$$c2019$$dQ3$$eT2
000078823 593__ $$aPaleontology$$c2019$$dQ2
000078823 593__ $$aEarth-Surface Processes$$c2019$$dQ2
000078823 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000078823 700__ $$0(orcid)0000-0002-5246-366X$$aOsácar, M.C.$$uUniversidad de Zaragoza
000078823 700__ $$0(orcid)0000-0003-1463-1682$$aAuqué, L.$$uUniversidad de Zaragoza
000078823 700__ $$0(orcid)0000-0002-1304-2264$$aSancho, C.$$uUniversidad de Zaragoza
000078823 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica
000078823 7102_ $$12000$$2427$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Externa
000078823 7102_ $$12000$$2280$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Estratigrafía
000078823 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000078823 773__ $$g8, 1 (2019), 13 [20 pp]$$pJ. Palaeogeogr.$$tJournal of Palaeogeography-English$$x2095-3836
000078823 8564_ $$s1894774$$uhttps://zaguan.unizar.es/record/78823/files/texto_completo.pdf$$yVersión publicada
000078823 8564_ $$s87909$$uhttps://zaguan.unizar.es/record/78823/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
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000078823 951__ $$a2023-09-13-10:40:46
000078823 980__ $$aARTICLE