147763 20250103153613.0 doi 10.3390/min11121339 sideral 125459 ART-2021-125459 eng Bauluz, Blanca Universidad de Zaragoza (orcid)0000-0002-4970-6333 Micro- and Nanotexture and Genesis of Ball Clays in the Lower Cretaceous (SE Iberian Range, NE Spain) 2021 Ball clay deposits in the SE of the Iberian Range (NE Iberian Peninsula) consist of Albian clays and siltstones with greyish and blackish colors, interbedded with subbituminous coals. The ball clays are nowadays mined for the manufacture of white color ceramics. The mineralogy of these deposits consists mainly of kaolinite, illitic phases, and quartz. The euhedral to sub-euhedral morphology of the kaolinites suggests their in-situ origin. The anhedral morphology of the illites and the presence of frayed illites suggest a detrital origin. At the micro-scale, authigenic kaolinite booklets are observed filling pores and forming micakaolinite intergrowths, in which the kaolinite grows between the cleavage sheets of pre-existing detrital mica. At nanometer scale, illitesmectite (IS) phases are detected forming interlayers with mica and kaolinite, and evidence of the replacement of mica by kaolinite is observed. The matrix consists of defective illite and kaolinite, and random mixed layers of kaolinite-IS (Kln-IS), illite-IS (Ilt-IS), and IS-smectite (IS-S). The textures of illite and the presence of different types of mixed layers suggest that the expandable phases and kaolinite are products of mica alteration. The effectivity of the alteration was probably a consequence of the low pH that occurred in the environment due to the presence of abundant organic- and acidic- rich fluids. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/E18-20R info:eu-repo/grantAgreement/ES/MCIU-AEI-FEDER/RTI2018-093419-B-I00 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 2.818 2021 GEOCHEMISTRY & GEOPHYSICS 42 / 87 = 0.483 2021 Q2 T2 MINING & MINERAL PROCESSING 8 / 20 = 0.4 2021 Q2 T2 MINERALOGY 11 / 30 = 0.367 2021 Q2 T2 0.522 2021 Geotechnical Engineering and Engineering Geology 2021 Q2 Geology 2021 Q2 3.7 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Mayayo, María José Universidad de Zaragoza (orcid)0000-0003-0410-6948 Laita, Elisa Universidad de Zaragoza (orcid)0000-0002-1954-6180 Yuste, Alfonso Universidad de Zaragoza (orcid)0000-0002-2169-4561 2000 120 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Cristalografía Mineralog. 11, 12 (2021), 1339 [15 pp.] Minerals (Basel) Minerals 2075-163X 11533413 http://zaguan.unizar.es/record/147763/files/texto_completo.pdf Versión publicada 2748609 http://zaguan.unizar.es/record/147763/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:147763 articulos driver 2025-01-03-13:21:03 ARTICLE