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Detailed clay mineralogy of the Triassic-Jurassic boundary section at Kendlbachgraben (Northern Calcareous Alps, Austria)

Published online by Cambridge University Press:  09 July 2018

N. Zajzon ,
F. Kristály ,
J. Pálfy  and
T. Németh
N. Zajzon*
Affiliation:
Institute of Mineralogy and Geology, University of Miskolc, Egyetemváros, Miskolc, Hungary
F. Kristály
Affiliation:
Institute of Mineralogy and Geology, University of Miskolc, Egyetemváros, Miskolc, Hungary
J. Pálfy
Affiliation:
Department of Physical and Applied Geology, Eötvös University, Budapest, Hungary Research Group for Paleontology, Hungarian Academy of Sciences–Hungarian Natural History Museum–Eötvös University, Budapest, Hungary
T. Németh
Affiliation:
Institute for Geochemical Research, Hungarian Academy of Sciences and Department of Mineralogy, Eötvös University, Budapest, Hungary
*
*E-mail: [email protected]
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Abstract

The Triassic-Jurassic boundary (TJB) is marked by one of the five largest Phanerozoic mass extinctions. To constrain existing models for TJB events, we obtained a stratigraphically highly resolved dataset from a marine section at Kendlbachgraben, Austria.

The topmost Triassic Kössen Formation contains low to medium-charged smectite and vermiculite as alteration products of mafic-ultramafic minerals. The clay minerals in the boundary mudstone are kaolinite ⩾ illite + muscovite ⨠ smectite > chlorite. Predominant kaolinite suggests humid climate and abundant terrigenous input. In the lowermost Jurassic, the clay mineral pattern changes to illite + muscovite ⨠ kaolinite ⨠ smectite, which reflects change to less humid and more moderate climate.

The topmost Kössen Formation also contains clay spherules. Their composition, shape and size indicate that they are alteration products of airborne volcanic glass droplets solidified in the air, settled in the sea and altered rapidly with negligible transport in terrestrial or marine environments. Our data are consistent with sudden climatic change at the TJB, as a result of large-scale volcanic activity of the Central Atlantic Magmatic Province which produced distal airfall volcanic ash.

Keywords

Triassic-Jurassic boundaryKendlbachgrabenclay mineralogyvolcanic spherulesclimate changeAustria
Type
12th George Brown Lecture
Information
Clay Minerals , Volume 47 , Issue 2 , June 2012 , pp. 177 - 189
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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