Italian Journal of Geosciences - Vol. 140 (2021) f.1

Texture and mineralogy as proxies of late Holocene tsunami deposits from the Doñana National Park (SW Spain)

Francisco Ruiz (1,8), María Isabel Carretero (2), Manuel Pozo (3), María Luz González-Regalado (1,8), Guadalupe Monge (2), Joaquín Rodríguez Vidal (1,8), Luis Miguel Cáceres (1,8), Manuel Abad (4), Josep Tosquella (1), Tatiana Izquierdo (4,5), Juan Manuel Muñoz (6), María Isabel Prudencio (7), María Isabel Dias (7), Rosa Marques (7), Paula Gómez (1,8), Antonio Toscano (1), Verónica Romero (1) & Marta Arroyo (1)
(1) Departamento de Ciencias de la Tierra, Universidad de Huel- va, Avda. Tres de Marzo, s/n, 21071-Huelva, Spain. (2) Departamento de Cristalografía, Mineralogía y Química Agrícola, Universidad de Sevilla, C/Profesor García González 1, 41012, Spain. (3)Departamento de Geología y Geoquímica, Universidad Autónoma de Madrid, Avda. Francisco Tomas y Valiente 7, 28049-Ma- drid, Spain . (4) Departamento de Biología y Geología, Física y Química In- orgánica, ESCET, Universidad Rey Juan Carlos, 28933-Móstoles, Spain. (5) Universidad de Atacama, Avda. Copayapu 485, Copiapó, Chile. (6) Departamento de Estadística e Investigación Operativa, Uni- versidad de Sevilla, C/Profesor García González 1, 41012, Spain. (7) Centro de Ciências e Tecnologias Nucleares (C2TN), Institu- to Superior Técnico, Universidade de Lisboa, Estrada Nacional 10 (k 139.7), 2695-066-Bobadela LRS, Portugal. (8) Centro de Investigación en Patrimonio Histórico, Cultural y Natural (CIPHCN), Universidad de Huelva, 21071-Huelva, Spain. Corresponding author e-mail: ruizmu@uhu.es


DOI: https://doi.org/10.3301/IJG.2021.02
Volume: 140 (2021) f.1

Abstract

The multidisciplinary analysis (dating, texture, total mineralogy) of two deep cores collected in the Doñana National Park (SW Spain) allows to distinguish the main features of three tsunami deposits found in three different paleoenvironmental scenarios (TSU-1: inner area of an open lagoon; TSU-2: inner area of a restricted lagoon; TSU- 3: outer area of a restricted lagoon). The main textural feature of the inner lagoonal tsunami deposits is the increase in bioclastic sands, while the outer TSU-3 is composed almost entirely of medium and fine sands without bioclasts. The mineralogical analysis of TSU-1 and TSU-2 reveals a decrease in phyllosilicates in the basal layers of these tsunami deposits and a parallel increase of quartz, feldspars, dolomite and sometimes calcite. Silica is the main component of TSU-3, whose mineralogical composition changes progressively due to the action of tidal currents in the inlet lagoon on which it is deposited. This rich- SiO2 outer tsunami deposit is derived from the erosion of the adjacent aeolian systems, while the inner TSU-1 and TSU-2 were generated by the transport of bioclastic sands from the outermost parts through the lagoon (TSU-1), or through a nearby tidal channel (TSU-2).

Keywords


Get Full Text