Differential stresses estimated from calcite veins in HP-LT Triassic Hallstatt Limestones (Northern Calcareous Alps, Austria)

Barbora ŠČERBÁKOVÁ, Hans-Jürgen Gawlick, Zoltan NÉMETH

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Using paleopiezometry we calculated differential stresses (σD = σ 1 – σ 3), recorded by calcite veins during final stages of deformation of exhumed HP-LT Triassic Hallstatt Limestone blocks in the Pailwand Mt. (central Northern Calcareous Alps). Extreme recrystallization of the micrite of Hallstatt Limestone, which had taken place earlier than the studied calcite veins originated, has not allowed us to use calcite paleopiezometry on host rock. Studied calcite veins were strained during the last deformation phase which the Hallstatt Limestone has underwent. High number of deformation twins per 1 mm in calcite grains (Twin Density; D = 21–47) with grainsize from 323 to 571 μm demonstrates the deformation at differential stresses from 184 to 234 MPa. This paper supports earlier interpretation that the Hallstatt Limestone in the Northern Calcareous Alps represents a lateral equivalent of a part of the Bôrka nappe of Meliata unit in the Western Carpathians and both segments underwent Middle Jurassic subduction, followed by rapid Late Jurassic-Early Cretaceous exhumation and thrusting.
Original languageEnglish
Pages (from-to)33-44
Number of pages12
JournalMineralia Slovaca
Issue number1
Publication statusPublished - 2020

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