Asociaciones palinológicas del tránsito Rhaetiense-Hettangiense en Asturias (España)



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Barrón, E. and Gómez, J. J. and Goy, Antonio and Pieren, A. P. (2005) Asociaciones palinológicas del tránsito Rhaetiense-Hettangiense en Asturias (España). Geotemas, 8 . pp. 133-136. ISSN 1576-5172

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The palynological study of 49 successive samples collected from the Vilorteo and Cantavieyo Diamond Drill Holes, drilled in the La Camocha Mine area, near Gijón (Asturias), allowed the characterization of three palynological assemblages. The oldest assemblage (PA!) is characteristic of the Rhaetian. A precise age for the middle assemblage (PA2) cannot be assigned, due to the scarce productivity of the samples. The youngest assemblage (PA3) is characteristic of the Hettangian. Consequently the Triassic-Jurassic boundary (TIB) is located within the upper part of the carbonate succession of the Solis Mb. Two palynozones, Rhaetipollis germanicus Zone and Krausselisporites reissingeri Zone, have been established. Their boundary nearly coincides with the T/B. A quantitative analysis reveals an increase in the proportion of hygrophilous and warmer taxa near the TJB, compatible with a global climatic change probably related with the end-Triassic mass extinction.

Item Type:Article
Uncontrolled Keywords:Palynology, biostratigraphy, climate change, Rhaetian-Hettangian, Asturias.
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Paleontology
ID Code:60668
Deposited On:28 May 2020 10:38
Last Modified:25 Mar 2021 07:27

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