Emplacement and associated sedimentary record of the Jurassic submarine salt allochthon of the Wurzeralm (Eastern Alps, Austria)

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1111/ter.12675. This is version 3 of this Preprint.

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Authors

Maditha Kurz, Oscar Fernandez , Lino Eggerth, Bernhard Grasemann, Philipp Strauss

Abstract

A fossil salt sheet emplaced in the Jurassic in submarine conditions is described in the Eastern Alps of Austria, providing unique insights into the emplacement of similar submarine structures and their potential control on depositional systems. The salt sheet is a plug-fed extrusion emplaced due to squeezing of a salt diapir under compression. The preserved mylonitic shear fabric in the evaporites indicates radial, south-directed emplacement of the salt sheet. Tectono-sedimentary relationships record the evolution of the salt structure, from initial diapiric growth, to salt sheet extrusion and posterior collapse. Syn-extrusion sediments record the variable bathymetry of the extruding salt sheet, with reefal carbonates building up on the crestal bulge while their deeper water equivalents accumulated on the extruding salt lobe. This is the first description of a salt allochthon still linked to its source diapir in the Eastern Alps.

DOI

https://doi.org/10.31223/X5RH3J

Subjects

Tectonics and Structure

Keywords

Fossil salt sheet, diapir, gypsum mylonite, Eastern Alps, syn-tectonic sedimentation

Dates

Published: 2023-05-15 23:28

Last Updated: 2023-08-11 07:44

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No Creative Commons license

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Data Availability (Reason not available):
Data is available from authors upon request