Quartz c-axis fabrics in constrictionally strained orthogneisses: implications for the evolution of the Orlica-Śnieżnik Dome, the Sudetes, Poland

Żelaźniewicz, A.; Kromuszczyńska, O.; Biegała, N.

doi:10.2478/agp-2013-0030

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Tytuł artykułu

Quartz c-axis fabrics in constrictionally strained orthogneisses: implications for the evolution of the Orlica-Śnieżnik Dome, the Sudetes, Poland

Autorzy

Żelaźniewicz A. , Kromuszczyńska O. , Biegała N.

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DOI

10.2478/agp-2013-0030

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Abstrakty

The Orlica-Śnieżnik Dome (OSD), NE Bohemian Massif, contains in its core several gneiss variants with protoliths dated at ~500 Ma. In the western limb of the OSD, rodding augen gneisses (Spalona gneiss unit) are mainly L>S tectonites with a prominent stretching lineation. The few quartz LPO studies have produced somewhat discrepant results. Reexamination of these rocks revealed that texture formation was a protracted, multistage process that involved strain partitioning with changing strain rate and kinematics in a general shear regime at temperatures of the amphibolite facies (450–600°C). Quartz c-axis microfabrics show complex yet reproducible patterns that developed under the joint control of strain geometry and temperature; thus the LPOs are mixed features represented by pseudogirdle patterns. Domainal differences in quartz microfabrics (ribbons, tails, quartzo-feldspathic aggregate) are common in the Spalona orthogneisses but uncommon in the sheared migmatitic gneisses. In the latter rocks, the constrictional strain was imposed on the originally planar fabric defined by high-temperature migmatitic layering. The constrictional fabric of the Spalona gneisses may have developed in the hinge zones of kilometer-scale folds, where the elongation occurred parallel to the fold axes. Other occurrences of rodding gneisses throughout the Orlica-Śnieżnik Dome are thought to occupy similar structural positions, which would point to the significance of large-scale folds in the tectonic structure of the dome.

Słowa kluczowe

quartz c-axis constriction Augen orthogneiss microfabric Stretching Lineation rodding gneiss pseudo-girdle Bohemian Massif

Masyw Czeski kurczenie gnejs

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2013

Tom

Vol. 63, no. 4

Strony

697--722

Opis fizyczny

Bibliogr. 62 poz., il.

Twórcy

autor

Żelaźniewicz A.

pansudet@pwr.wroc.pl

Instytut Nauk Geologicznych PAN, Podwale 75, PL-50-449 Wrocław, Poland

autor

Kromuszczyńska O.

olga.kromuszczynska@twarda.pan.pl

Instytut Nauk Geologicznych PAN, Podwale 75, PL-50-449 Wrocław, Poland
Instytut Geologii UAM, Maków Polnych 16, PL-61-606 Poznań, Poland

autor

Biegała N.

Instytut Geologii UAM, Maków Polnych 16, PL-61-606 Poznań, Poland

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