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dc.contributor.author
Alonso Zarza, A. M.
dc.contributor.author
Genise, Jorge Fernando
dc.contributor.author
Cabrera, M. C.
dc.contributor.author
Mangas, J.
dc.contributor.author
Martín Pérez, A.
dc.contributor.author
Valdeolmillos, A.
dc.contributor.author
Dorado Valiño, M.
dc.date.available
2020-04-03T15:39:05Z
dc.date.issued
2008-07-31
dc.identifier.citation
Alonso Zarza, A. M.; Genise, Jorge Fernando; Cabrera, M. C.; Mangas, J.; Martín Pérez, A.; et al.; Megarhizoliths in Pleistocene aeolian deposits from Gran Canaria (Spain): Ichnological and palaeoenvironmental significance; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 265; 1-2; 31-7-2008; 39-61
dc.identifier.issn
0031-0182
dc.identifier.uri
http://hdl.handle.net/11336/101817
dc.description.abstract
The Pleistocene dune field of Tufia, located on the east of Gran Canaria (Spain), contains different stratigraphic levels of indurated pillar-like structures that are interpreted as megarhizoliths. The megarhizoliths occur at the top of different aeolian sets and reach 31.5 cm in diameter and over 1 m in height. These scattered, free-standing, vertical, cylindrical-to-slightly conical columns usually appear as hollow cylinders, displaying elliptical cross-sections aligned with the prevailing wind. On the leeward side of some specimens the external wall shows a tail of rock matrix resembling a sort of “wind shadow”. These tails and other remains of the associated rock matrix show a texture composed of long, horizontal, parallel cylinders orientated with the wind. Internally the most complete structures show five concentrically arranged zones: Zone (a), is a central pore corresponding to the cavity originally occupied by the root; Zones (b) and (c), which include alveolar and laminated carbonate textures indicating that carbonate precipitation was mostly induced by the roots and their associated microorganisms; and Zones (d) and (e), consisting mostly of aeolian sands. In (d) the sand grains show thin micritic coatings whereas in (e) vadose aragonite cements can be seen on the grain surface suggesting a less biogenic influence in their formation. The degree of cementation and the time of the precipitation of carbonate around the roots controlled the preservation of these zones. Thus, in some cases, Zones b, c and/or d are not preserved. Cylinders are up to 30× the diameter of the root that nucleated them. The presence of the megarhizoliths at the top of the aeolianite beds indicates that aeolian sedimentation halted several times, allowing soil formation and plant colonisation during slightly more humid periods. The occurrence of megarhizoliths is further proof of the alternation of arid and slightly more humid climates in the north Atlantic during the last glacial period. It is also noted that they may be misinterpreted as animal trace fossils or tree trunk casts, resulting in incorrect ichnological or palaeoenvironmental interpretations.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Megarhizoliths
dc.subject
Roots
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Trace Fossils
dc.subject
Canarias
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Paleontología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Megarhizoliths in Pleistocene aeolian deposits from Gran Canaria (Spain): Ichnological and palaeoenvironmental significance
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-03-16T15:08:24Z
dc.identifier.eissn
1872-616X
dc.journal.volume
265
dc.journal.number
1-2
dc.journal.pagination
39-61
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Alonso Zarza, A. M.. Universidad Complutense de Madrid; España
dc.description.fil
Fil: Genise, Jorge Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina. Museo Paleontológico Egidio Feruglio; Argentina
dc.description.fil
Fil: Cabrera, M. C.. Universidad de Las Palmas de Gran Canaria; España
dc.description.fil
Fil: Mangas, J.. Universidad de las Plumas de Gran Canaria; España
dc.description.fil
Fil: Martín Pérez, A.. Universidad Complutense de Madrid; España
dc.description.fil
Fil: Valdeolmillos, A.. Universidad Complutense de Madrid; España
dc.description.fil
Fil: Dorado Valiño, M.. Universidad de Alcalá; España
dc.journal.title
Palaeogeography, Palaeoclimatology, Palaeoecology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0031018208002630
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.palaeo.2008.04.020
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