Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia

Arne P. Willner; Michael Gopon; Johannes Glodny; Victor N. Puchkov; Hans-Peter Schertl

doi:10.1007/s12583-019-1249-2

Volume 30 Issue 6

Dec 2019

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Journal of Earth Science > 2019 > 30(6): 1144-1165.

Arne P. Willner, Michael Gopon, Johannes Glodny, Victor N. Puchkov, Hans-Peter Schertl. Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia. Journal of Earth Science, 2019, 30(6): 1144-1165. doi: 10.1007/s12583-019-1249-2

Citation:

Arne P. Willner, Michael Gopon, Johannes Glodny, Victor N. Puchkov, Hans-Peter Schertl. Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia. Journal of Earth Science, 2019, 30(6): 1144-1165. doi: 10.1007/s12583-019-1249-2

Citation:

Arne P. Willner, Michael Gopon, Johannes Glodny, Victor N. Puchkov, Hans-Peter Schertl. Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia. Journal of Earth Science, 2019, 30(6): 1144-1165. doi: 10.1007/s12583-019-1249-2

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Timanide (Ediacaran-Early Cambrian) Metamorphism at the Transition from Eclogite to Amphibolite Facies in the Beloretsk Complex, SW-Urals, Russia

doi: 10.1007/s12583-019-1249-2

1.
Institute of Geology, Mineralogy and Geophysics, Ruhr-University Bochum, D-44780 Bochum, Germany
2.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
Deutsches Geoforschungszentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany
4.
Institute of Geology and Geochemistry, Uralian Branch of Russian Academy of Science, 620016 Ekaterinburg, Russia

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Corresponding author: Arne P. Willner
Received Date: 21 Jun 2019
Accepted Date: 15 Sep 2019
Publish Date: 01 Dec 2019

Abstract

Abstract

The Beloretsk Metamorphic Complex in the SW Urals formed at a convergent eastern margin of Baltica during the Neoproterozoic-Early Cambrian Timanide orogeny. It comprises three major units with lenses of facies-critical metabasites within metasedimentary rocks:A lowermost eclogite unit, an intermediate garnet amphibolite unit and an upper amphibolite-greenschist unit. Pressure (P)-temperature (T)-paths of four rocks from the two lowermost units were determined mainly by PT pseudosection techniques showing similar clockwise loops at different peak metamorphic, water-satu-rated conditions:A phengite-bearing eclogite shows peak PT conditions of 16.5-18.5 kbar/525-550℃ (stage Ⅰ) followed by stage Ⅱ at 11.5-13.0 kbar/585-615℃. A garnet amphibolite from the intermediate unit yields lower peak conditions of 11.7-14.5 kbar/480-510℃ (stage Ⅰ) followed by stage Ⅱ at 9.5-11.0 kbar/535-560℃. However, a granite gneiss in the eclogite unit shows similar maximum pressures as the eclogite, but higher temperatures at 15.6-16.2 kbar/660-675℃, whereas a garnet micaschist contains comparable high pressure relicts, but underwent an advanced midcrustal reequilibration at 7.5-9.0 kbar/555-610℃. We dated the eclogite by a 7-point Rb/Sr mineral isochron (phengite, omphacite, apa-tite) at 532.2±9.1 Ma interpreted as age of crystallisation of the eclogitic peak PT assemblage. This age is the youngest compared to the known Timanide metamorphic and magmatic ages.
- Urals,
- eclogite,
- high pressure metamorphism,
- Timanide orogeny,
- Rb-Sr dating,
- PT pseudosections,
- PT-path

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References(74)

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