Gradual changes in the Olenekian-Anisian continental record and biotic implications in the Central-Eastern Pyrenean basin, NE Spain

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dc.contributor.authorLloret, Joan
dc.contributor.authorHorra Del Barco, Raúl De La
dc.contributor.authorGretter, Nicola
dc.contributor.authorBorruel Abadía, Violeta
dc.contributor.authorFernández Barrenechea, José María
dc.contributor.authorRonchi, Ausonio
dc.contributor.authorDiez, José B.
dc.contributor.authorArche, Alfredo
dc.contributor.authorLópez Gómez, José Trinidad
dc.date.accessioned2023-06-16T15:19:51Z
dc.date.available2023-06-16T15:19:51Z
dc.date.issued2020-09
dc.description.abstractThis work focuses on the Olenekian-Anisian (Early-Middle Triassic) continental record of the Central-Eastern Pyrenean basin (NE Spain), a near-equator (10°-14°N) basin located in the western peri-Tethys margin, inside the Variscan fold-belt. Due to the mass mortality of the end-Permian and the subsequent Smithian-Spathian Boundary (SSB) crisis, the Early Triassic and its transition to the Middle Triassic was a time period with intermittent stages of environmental instability that affected fauna and flora intensely. Compared to other crisis, a remarkable feature is the longer time required to achive life recovery during this time-interval and the fact that continental environments have been less globally studied than their marine counterparts. Furthermore, in SW Europe there is almost no sedimentary continental record from the beginning of the Triassic. This multidisciplinary study, embracing sedimentology, mineralogy, palaeontology, palaeopedology and palaeogeography, of 10 complete and well dated Early-Middle Triassic field sections has allowed (1) the location and characterization of the oldest Mesozoic sedimentary record in the basin, which is of late Smithian age and overlies the late-middle Permian continental rocks and of (2) the Smithian-Spathian transition (SST), (3) the timing of life recovery during the late Spathian-Anisian, (4) the characterization of the first incursion of the Tethys sea into the basin, and (5) the comparison of the evolution of this basin with other basins of the same age in SW Europe. The SST coincides with hyper-arid climate conditions, evolving to semi-arid in the late Spathian and semi-arid to semi-humid in Anisian times. Poorly sorted breccias and conglomerate alluvial sheets with aeolian reworking dominate the SST, as a result of these environmental changes and tectonicsA broader comparison, based on stratigraphic studies by other authors, indicates less aridity in the basin studied compared to other SW Europe basins in the same period, maybe due to its greater proximity to the equator. Sedimentary characteristics changed during the late Spathian, when sandy braided fluvial systems developed and the first dispersed plants, pollen assemblages and paleosols appeared. Well-developed floodplains and associated paleosols and plants developed during the early Anisian, when more humid conditions prevailed. The occurrence of aluminium phosphate-sulphate (APS) minerals might be considered as evidence of environmental acidification during the Olenekian with an amelioration during the early Anisian, as described in neighboring basins, although in the Pyrenean basin this acidification was probably less intensive. The first incursion of the Tethys sea reached the Central-Eastern Pyrenean basin during the Anisian-Ladinian transition, about 3 My later than in neighbouring Southwestern Europe basins. General comparison with other Early-Middle Triassic continental records of Western Europe basins indicates contrasting trends of climate and sedimentary evolution, probably related to the still prevailing great paleorelief of the Variscan foldbelt, where part of the study basin could constitute an elevated area during some time-intervals, possibly related to the so-called Ebro High.
dc.description.departmentDepto. de Geodinámica, Estratigrafía y Paleontología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/61392
dc.identifier.doi10.1016/j.gloplacha.2020.103252
dc.identifier.issn0921-8181
dc.identifier.officialurlhttps://www.sciencedirect.com/science/article/pii/S0921818120301430#!
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6374
dc.issue.number103252
dc.journal.titleGlobal and Planetary Change
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDPGC2018-098272-B-100
dc.rights.accessRightsrestricted access
dc.subject.cdu551.7"622.22" (234.12)
dc.subject.keywordSmithian
dc.subject.keywordSpathian
dc.subject.keywordEarly Triassic recovery
dc.subject.keywordPyrenean basin
dc.subject.keywordOlenekian
dc.subject.keywordSmithian-Spathian Transition
dc.subject.ucmGeología estratigráfica
dc.subject.ucmPaleontología
dc.subject.unesco2506.19 Estratigrafía
dc.subject.unesco2416 Paleontología
dc.titleGradual changes in the Olenekian-Anisian continental record and biotic implications in the Central-Eastern Pyrenean basin, NE Spain
dc.typejournal article
dc.volume.number192
dspace.entity.typePublication
relation.isAuthorOfPublication509bf5dc-e657-4052-8eca-019bb7e1350b
relation.isAuthorOfPublicationb0d179ce-eb7f-46a1-b1bf-4926c43bd780
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relation.isAuthorOfPublication.latestForDiscoveryb0d179ce-eb7f-46a1-b1bf-4926c43bd780
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