109627 20240319080947.0 doi 10.1007/s41513-021-00181-0 sideral 126007 ART-2022-126007 eng Laita, E. Universidad de Zaragoza (orcid)0000-0002-1954-6180 Weathering events recorded in uppermost Hauterivian-lower Barremian clay-dominated continental successions from the NW Iberian Range: climatic vs. tectonic controls 2022 Access copy available to the general public Unrestricted The facies and clay mineral study of clay/marl-rich levels from the Torrelapaja Formation (latest Hauterivian-early Barremian, NW Iberian Range, NE Spain) allowed to establish the palaeoclimatic and palaeoenvironmental conditions under they were generated. The muddy levels and pisoids contained therein of two logs were sampled and studied by X-ray diffraction and optical and electron microscopy. A similar mineralogical upwards trend is recorded in both logs, with a decrease in calcite coupled with an increase in quartz and orthoclase content and constant proportions in goethite, hematite, diaspore, anatase, rutile, ilmenite, and clay mineral content. The lower muddy levels have higher kaolinite content than the upper levels, where illitic phases are the dominant clay minerals. Smectite and intergrowths of illitic phases and kaolinite are also detected upwards. The kaolinite and smectite textures indicate an authigenic origin, whereas the illitic phases are former phases acting as a substrate for kaolinite crystallization. Pisoids mineralogy and texture show an in-situ origin, but some are fractured, indicating reworking processes. The mineral association found in the muddy levels is characteristic of oxisols formed under warm and humid conditions. The upward decrease in kaolinite content is coeval with an increase in the illitic phases and quartz content, related to siliciclastic input, but is also coeval with the presence of authigenic smectite. This indicates a decrease in chemical weathering, not fully registered due to the siliciclastic contribution, which was possibly associated with a change to colder, drier conditions during the latest Hauterivian-early Barremian in the studied area. info:eu-repo/grantAgreement/ES/DGA/E18-20R info:eu-repo/grantAgreement/ES/MCIU/RTI2018-093419-B-100 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.3 2022 GEOLOGY 30 / 48 = 0.625 2022 Q3 T2 0.484 2022 Stratigraphy 2022 Q2 Geology 2022 Q2 3.2 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Bauluz, B. Universidad de Zaragoza (orcid)0000-0002-4970-6333 Aurell, M. Universidad de Zaragoza (orcid)0000-0002-2430-7424 Badenas, B. Universidad de Zaragoza (orcid)0000-0003-1112-524X Yuste, A. Universidad de Zaragoza (orcid)0000-0002-2169-4561 2000 280 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Estratigrafía 2000 120 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Cristalografía Mineralog. 48 (2022), 45–63 J. iber. geol. JOURNAL OF IBERIAN GEOLOGY 1698-6180 7284605 http://zaguan.unizar.es/record/109627/files/texto_completo.pdf Versión publicada 2158423 http://zaguan.unizar.es/record/109627/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:109627 articulos driver 2024-03-18-12:43:24 ARTICLE