000095987 001__ 95987 000095987 005__ 20210902121752.0 000095987 0247_ $$2doi$$a10.1344/GeologicaActa2020.18.7 000095987 0248_ $$2sideral$$a118821 000095987 037__ $$aART-2020-118821 000095987 041__ $$aeng 000095987 100__ $$aLarena, Z. 000095987 245__ $$aStratigraphy and sedimentology of distal-alluvial and lacustrine deposits of the western-central ebro basin (NE iberia) reflecting the onset of the middle miocene climatic optimum 000095987 260__ $$c2020 000095987 5060_ $$aAccess copy available to the general public$$fUnrestricted 000095987 5203_ $$aStratigraphic and sedimentological study of distal alluvial and lacustrine deposits in the Plana de la Negra-Sancho Abarca area (western-central Ebro Basin, NE Iberia) within the early and middle Miocene allows five main lithofacies to be characterized and mapped within two tectosedimentary units, construction of a sedimentary facies model and discussion on allogenic controls on sedimentation. In this area, the boundary between tectosedimentary units T5 and T6 appears to be conformable and is marked by the change from dominant clastics to carbonates. Correlation of the studied outcrops with nearby sections that already had magnetostratigraphic and biostratigraphic data allows the studied succession to be dated from C5Dr to C5Cn (Burdigalian-Langhian), placing the boundary T5/T6 at ca.16.1-16.05Ma. Seven vertical facies sequences document deposition of distal alluvial clastics and palustrine and lacustrine carbonates. Sandstones and mudstones represent low-sinuosity channels and lateral and terminal splays by unconfined flows runnig across the alluvial plain, associated to the Pyrenean-derived Luna fluvial system. The carbonates contain charophytes, ostracods, bivalves and gastropods, indicating deposition in 2-4m deep lakes. Laminated carbonate facies record reworking of shore carbonates and the influx fine-siliciclastic sediment offshore. Abundant bioturbation and desiccation features indicate episodic submergence and subaerial exposure. Four main episodes of alluvial and associated palustrine/lacustrine facies belt shifts are identified. Alluvial deposition in the studied T5 unit is related to low lake level conditions, rather than to a Pyrenean uplift. The maximum extent of the freshwater carbonates occur at the base of unit T6. This is consistent with conditions of increasing humidity of the Middle Miocene Climatic Optimum. 000095987 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CGL2013-42867-P 000095987 540__ $$9info:eu-repo/semantics/openAccess$$aby-sa$$uhttp://creativecommons.org/licenses/by-sa/3.0/es/ 000095987 590__ $$a1.432$$b2020 000095987 591__ $$aGEOLOGY$$b25 / 48 = 0.521$$c2020$$dQ3$$eT2 000095987 592__ $$a0.523$$b2020 000095987 593__ $$aGeology$$c2020$$dQ2 000095987 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000095987 700__ $$0(orcid)0000-0002-4212-0524$$aArenas, C.$$uUniversidad de Zaragoza 000095987 700__ $$aBaceta, J.I. 000095987 700__ $$aMurelaga, X. 000095987 700__ $$aSuarez-Hernando, O. 000095987 7102_ $$12000$$2280$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Estratigrafía 000095987 773__ $$g18 (2020), 1-26$$pGeol. acta$$tGEOLOGICA ACTA$$x1695-6133 000095987 8564_ $$s2635648$$uhttps://zaguan.unizar.es/record/95987/files/texto_completo.pdf$$yVersión publicada 000095987 8564_ $$s353650$$uhttps://zaguan.unizar.es/record/95987/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000095987 909CO $$ooai:zaguan.unizar.es:95987$$particulos$$pdriver 000095987 951__ $$a2021-09-02-09:49:27 000095987 980__ $$aARTICLE