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Geology of Styria: an Overview

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Geology of Styria: an Overview ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Mitteilungen des naturwissenschaftlichen Vereins für Steiermark Jahr/Year: 2009 Band/Volume: 139 Autor(en)/Author(s): Gasser Deta, Gusterhuber Jürgen, Krische Oliver, Puhr Barbara, Scheucher Lorenz E. A., Wagner Thomas, Stüwe Kurt Artikel/Article: Geology of Styria: An overview. 5-36 © Naturwissenschaftlicher Verein für Steiermark; download unter www.biologiezentrum.at Mitteilungen des naturwissenschaftlichen Vereines für Steiermark Bd. 139 S. 5–36 Graz 2009 Geology of Styria: An overview From Deta Gasser1, Jürgen Gusterhuber2, Oliver Krische2, Barbara Puhr1, Lorenz Scheucher2, Thomas Wagner1 & Kurt Stüwe1 With 17 figures and 1 table Angenommen am 30. Oktober 2009 Zusammenfassung: Geologie der Steiermark: Ein Überblick. – Im Frühling 2009 organisierte die steirische Doktoratsschule Erdwissenschaften eine geologische Exkursion zum Thema „Geologie der Steiermark“. Die Exkursion wurde von Doktoranden der drei steirischen Universitäten KF Graz, TU Graz und MU Leoben geführt. Resultierend aus dieser Exkursion präsentieren wir hier eine vereinfachte Beschreibung der Geologie der Steiermark, basierend auf modernen Konzepten zur tektonischen Ent- wicklung des Bundeslandes. Im ersten Teil werden die tektonischen Einheiten, welche die Steiermark aufbauen, präsentiert. Im zweiten Teil wird die zeitliche geodynamische Entwicklung dieser Einheiten beschrieben. Ein dritter Teil behandelt die wirtschaftliche Bedeutung von geologischen Rohstoffen in der Steiermark. Die Abbildungen dieses Artikels sind auch auf den Seiten des naturwissenschaftlichen Vereins und auf http://wegener.uni-graz.at zu finden. Summary: In 2009 the Styrian Doctoral School of Earth Sciences organised a field workshop on the geology of Styria. The field trip was led by PhD students of the three participating universities: KFU Graz, TU Graz and MU Leoben. As an outcome of this field trip, we present here the geology of the entire pro- vince in a simplified way, taking into account modern concepts of the tectonic evolution. In a first part, the tectonic units building up Styria are presented; in a second part the geodynamic evolution of these units through time is described. A third part deals with the economic significance of mineral resources in Styria. The figures of this contribution are available online on the pages of the naturwissenschaftlicher Verein and at http://wegener.uni-graz.at. 1. Introduction Styria, the second largest province of Austria, has a very rich and diverse geological history. Located at the transition from the European Alps in the west to the Pannonian Basin in the east, it contains rocks that tell a fascinating story of mountain building and basin formation that covers at least the last 500 million years of Earth‘s history. Indeed, the capital of Styria, Graz, can probably boast with the fact of having a more variable geology within 50 km radius than just about any other state capital in the world: from volcanism to high-grade metamorphic rocks, from young limestones to ancient marbles, from active mountain building to sedimentary basin formation, all can be found within an hours drive in Styria. Earth Sciences in general and the processes that shaped the geological history of Styria in particular can be studied at three universities in Styria: the Karl Franzens University Graz (KFU), the Technical University Graz (TUG) and the Montan University Leoben (MUL). As part of the newly founded joint Doctoral School of Earth Sciences of the three universities, a geological field trip for PhD students took place in May 2009 (Fig. 1). The 1 Deta Gasser, Barbara Puhr, Thomas Wagner, Kurt Stüwe, Institut für Erdwissenschaften, Karl- Franzens-Universität, Universitätsplatz 2, 8010 Graz, E-Mail: [email protected], [email protected], [email protected], [email protected] 2 Jürgen Gusterhuber, Oliver Krische, Lorenz Scheucher, Institut für angewandte Geowissenschaften und Geophysik, Peter-Tunner-Strasse 5, 8700 Leoben, E-Mail: [email protected], [email protected], [email protected] 5 © Naturwissenschaftlicher Verein für Steiermark; download unter www.biologiezentrum.at Fig. 1: Group photo of participants of the first field excursion with the topic “Geology of Styria” of the joint doctoral school “Earth Sciences” of the three universities KF Graz, TU Graz and MU Leoben. The rock boulder consists of a Permian gabbro eclogitized during the Cretaceous oro- geny, Koralpe, Styria. Participants: 1 Thomas Wiedel (KF), 2 Dr. Prof. Roland Bakker (MU) 3 Latif Yalcinoglu (MU), 4 Lorenz Scheucher (MU), 5 Bernhard Hubinger (KF), 6 Patrick Grunert (KF), 7 Andrea Kern (KF), 8 Stefan Hausegger (TU), 9 Emilie Bruand (KF), 10 Florian Mit- termeyer (TU), 11 Oliver Krische (MU), 12 Jürgen Gusterhuber (MU), 13 Muhammad Imran (MU) 14 Omar Mohammed (KF), 15 Nantasin Prayath (KF), 16 Ivana Cuperova (MU), 17 Barbara Puhr (KF), 18 Nina Gegenhuber (MU), 19 Dr. Prof. Kurt Stüwe (KF), 20 Rhamat Ali Gakkhar (MU), 21 Nicolas Legrain (KF), 22 Thomas Wagner (KF), 23 Deta Gasser (KF), 24 Tamer Abu-Alam (KF), 25 Esam Abu El-Siba (MU). aim was to introduce the (partly international) students to the geology of Styria and to provide an overview of the complex geological history of this area. The excursion was led by PhD students who work on geological projects in different parts of Styria and was co- ordinated by K. Stüwe. During the field trip, the idea was born to present the geology of Styria to a wider audience. This contribution is the outcome of a combined effort of the involved PhD students to present a simplified, modern overview of the geological history of Styria to professional earth scientists and non-professionals alike. Our contribution presents an overview over the different tectonic units building up the province, the diffe- rent rock types occurring in these units, the evolution of these units through time as well as the economic significance of ore deposits in the state. Around 200 years of geological research in Styria led to the formulation of many different models and concepts explaining its geological history. �������������������������A milestone in the under- standing of the geological history of Styria was the contribution by Flügel & Neubauer 1984. However, since then, many debates were led about the exact tectonic relationship between different units, or about which rocks actually belong to which units and which do not. Some of these debates are still ongoing (fortunately for the active geologists!). There are debates of only local importance; others deal with the large-scale origin of huge 6 © Naturwissenschaftlicher Verein für Steiermark; download unter www.biologiezentrum.at areas in Styria. We are aware of these controversies, but a short overview contribution like ours can never cope with all of them. We therefore decided to closely follow the two recent contributions of Schmid & al. 2004 and Froitzheim & al. 2008, except for the Northern Calcareous Alps where we follow Frisch & Gawlick 2003. In addition we would like to point to the contribution by Neubauer & al. 2000 where a different nomen clature and tectonic interpretation is used. In addition, we selected a small number of the most recent/relevant contributions on each geological unit. Clearly, this selection is our personal choice and meant to give the reader only a starting-point. 2. Geographical division of Styria On a topographic map derived from a digital elevation model (Fig. 2), a first-order geo- graphic division of Styria is immediately obvious: whereas the northern, western and south- western parts of Styria are built up of rugged mountains, the south-eastern part is made up of relatively flat lowlands with only minor topographic relief. This transition is spectacular: it marks the passage from the Alps, which extend hundreds of kilometres westward all the way to Nice, to the Pannonian Basin, which extends hundreds of kilometres eastward all the way to the Carpathian arc. �����������������������������������������������������������������������������Three main rivers drain the Alpine part of Styria to either side of the prin- cipal Alpine divide (located at the Schoberpass, Präbichl and Semmering): the Enns towards the north-west and the Mur and Mürz towards the south-east (Fig. 2). The valleys formed by Fig. 2: Topographic map derived from a digital elevation model of Styria with the transition from the Eastern Alps into the Styrian/Pannonian Basin nicely visible. The Alpine part of Styria is divided into several regions, whereof the most important ones are: (1) Niedere Tauern, (2) Koralpe, (3) Gleinalpe, (4) Fischbacher Alpen, (5) Eisenerzer Alpen, (6) Seetaler Alpen, (7) Grazer Bergland, (8) Rax, (9) Hochschwab, (10) Gesäuse, (11) Dachstein. More detailed topographic maps of Styria are online at: www.austrianmap.at. 7 © Naturwissenschaftlicher Verein für Steiermark; download unter www.biologiezentrum.at these three river systems divide the Alpine part of Styria into several smaller massifs, of which the most important ones are the Niederen Tauern, Koralpe, Gleinalpe, Fischbacher Alpen, Eisenerzer Alpen, Seetaler Alpen, Grazer Bergland, Rax, Hochschwab, Gesäuse and Dachstein (Fig. 2). The part of the Pannonian Basin exposed in Styria is called the Styrian Basin. Typical photographs of different Styrian landscapes are shown on Fig. 3. Each of these landscapes has its own geological history,
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