New insights into the Cambrian to Permian evolution of the Austroalpine basement units of the Schladming Crystalline by U­Pb zircon geochronology and granitoid geochemistry

Isabella Haas; Walter Kurz; Christoph Iglseder; Daniela Gallhofer; Harald Fritz; Etienne Skrzypek; Christoph Hauzenberger

doi:10.17738/ajes.2026.0007

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New insights into the Cambrian to Permian evolution of the Austroalpine basement units of the Schladming Crystalline by UPb zircon geochronology and granitoid geochemistry

Austrian Journal of Earth Sciences

Volume 119 (2026): Issue 1 (January 2026)

By: Isabella Haas, Walter Kurz, Christoph Iglseder, Daniela Gallhofer, Harald Fritz, Etienne Skrzypek and Christoph Hauzenberger

Open Access

|Aug 2026

Abstract

The Austroalpine unit comprises, among others, pre-Variscan and Variscan crustal fragments that were incorporated into several nappe systems during Alpine orogeny. These fragments therefore provide important insights that help fill in gaps in our knowledge regarding pre-Alpine paleogeography, tectonics and related magmatism. U-Pb zircon dating in combination with geochemical whole rock and zircon isotope data of meta-granitoids revealed three distinct pre-Alpine plutonic suites within the Austroalpine Schladming crystalline: (1) the Lignitz Plutonic Suite, (2) the Untertal Plutonic Suite and (3) the Eisenhut Plutonic Suite.

The mostly fine grained, highly fractionated meta-granitoids of the Lignitz Plutonic Suite have U-Pb ages ranging from 480.1 ± 6.4 to 501.2 ± 6.6 Ma and mean ƐHf(t) values between 6.8 and 11.2. The Hf-isotopes partly hint to a mantle source with different degrees of crustal material assimilation during magma ascent. This suite is highly differentiated showing met- to peraluminous, calc-alkalic character. A suitable setting for this suite is an active margin along northern Gondwana during the Ceneric orogeny. The meta-granitoids to meta-granodiorites of the Untertal Plutonic Suite have U-Pb zircon ages between 350.4 ± 4.8 Ma and 370.4 ± 4.9 Ma and ƐHf(t) values between 2.6 and 3.9. Ordovician ages and high ƐHf(t) values of zircon cores indicate remelting of parts of the Lignitz Plutonic Suite. The Untertal Plutonic Suite is poorly fractionated having comparatively low SiO2 and high Al2O3 contents. The rocks are strongly peraluminous, mostly magnesian and have calc-alkalic to alkali-calcic affinities. Emplacement of the Untertal Plutonic Suite can be related to a Devonian/early Carboniferous continental arc setting that formed during the early phases of the Variscan orogeny. The Eisenhut Plutonic Suite contains highly fractionated meta-granitoids with ages between 261.0±3.5 Ma and 271.2±5.7 Ma and ƐHf(t) values of 2.7 to 5.2. Its more juvenile ƐHf(t) values probably indicate renewed input of mantle-derived melts. This suite is peraluminous, ferroan and has a calc-alkalic to alkali-calcic character. It likely intruded during Permian lithospheric extension, following late Variscan orogeny that was accompanied by formation of horst-graben structures that finally resulted in the disintegration of Pangea.

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Articles in this issue

DOI: https://doi.org/10.17738/ajes.2026.0007 | Journal eISSN: 2072-7151 | Journal ISSN: 0251-7493

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Language: English

Page range: 115 - 150

Submitted on: Feb 24, 2026

Accepted on: Jul 28, 2026

Published on: Aug 26, 2026

Published by: Austrian Geological Society

In partnership with: Paradigm Publishing Services

Keywords:

Eastern Alps,

pre-Alpine basement,

Austroalpine unit,

Silvretta-Seckau Nappe System,

plutonic suite,

tectono-magmatic evolution,

paleogeographic situation

Related subjects:

Geosciences,

Geophysics,

Geology and mineralogy,

Geosciences, other

© 2026 Isabella Haas, Walter Kurz, Christoph Iglseder, Daniela Gallhofer, Harald Fritz, Etienne Skrzypek, Christoph Hauzenberger, published by Austrian Geological Society
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 119 (2026): Issue 1 (January 2026)

New insights into the Cambrian to Permian evolution of the Austroalpine basement units of the Schladming Crystalline by U­Pb zircon geochronology and granitoid geochemistry

Abstract

New insights into the Cambrian to Permian evolution of the Austroalpine basement units of the Schladming Crystalline by UPb zircon geochronology and granitoid geochemistry