Conspicuous sediment structures in fossil beach deposits (southern Tenerife, Canary Islands, Spain): paleoliquefaction features versus biogenic origin |
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| Authors: | Jörg Kröchert Elmar Buchner Luis I González de Vallejo |
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| Institution: | (1) Institut für Planetologie, Herdweg 51, 70174 Stuttgart, Germany;(2) Departamento de Geodinamica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain |
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| Abstract: | Tubular-shaped concretions and concretionary dykes occur in Holocene fossil beach deposits between the township of El Médano
and Punta Roja in southern Tenerife, Canary Islands. These sediment structures have been interpreted either as the result
of (a) the interaction between hot ignimbrites that overflowed wet beaches; (b) fast accumulation of beach sands on hot and
degassing ignimbrites; (c) paleoliquefaction caused by an earthquake (seismites). Based on the interpretation as seismites,
an intense paleoearthquake with a moment magnitude of M = 6.8 was proposed to be responsible for the generation of the paleoliquefaction structures. However, we here reinterpret
the sedimentary structures in question using the general criteria diagnostic for rhizocretions and root tubules with respect
to their orientation, size, branching system, and style of cementation and, thus, consider them, to be of biogenic origin. |
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| Keywords: | Seismites Root tubules Rhizocretions Dewatering structures Tenerife Canary Islands |
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