Podiform chromitites from the Variscan ophiolite serpentinites of Lower Silesia (SW Poland) : petrologic and tectonic setting implications

Wojtulek, P. M.; Puziewicz, J.; Ntaflos, T.; Bukała, M.

doi:10.7306/gq.1238

Artykuł - szczegóły

Tytuł artykułu

Podiform chromitites from the Variscan ophiolite serpentinites of Lower Silesia (SW Poland) : petrologic and tectonic setting implications

Autorzy

Wojtulek P. M. , Puziewicz J. , Ntaflos T. , Bukała M.

Treść / Zawartość

Pełne teksty:

Wojtulek_P_Podiform _Geol. Quart._Vol. 60_No 1_2016.pdf

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Identyfikatory

DOI

10.7306/gq.1238

Warianty tytułu

Języki publikacji

Abstrakty

The Gogołów-Jordanów Serpentinite Massif (GJSM) and the Braszowice-Brzeźnica Massif (BBM) are the largest serpentinite outcrops in the Fore-Sudetic Block (NE part of the Bohemian Massif, Central Europe). The GJSM is a peridotitic member of the Variscan Ślęża Ophiolite (SW Poland). Podiform bodies (veins and pockets) of chromitite are found on the Czernica Hill (GJSM) and on the Grochowiec Hill (BBM) within strongly serpentinized harzburgites which occur several hundred metres below Paleo-Moho. Chromitites consist of rounded chromite grains up to 3 cm across, and of chlorite filling the interstices. The veins are embedded in serpentine-olivine-chlorite aggregates. Relics of Mg-rich olivine (Fo_95-96) occur in massive chromitite in the BBM. The bulk-rock total PGEs content is very low (42-166 ppm) and the PGE pattern is negatively sloped towards Pt and Pd and depleted relative to chondrite. The primary chromite I is aluminous (Cr# 0.50-0.52, Mg# 0.60-0.70). The highly aluminous and magnesian (Cr# 0.38, Mg# 0.80) chromite Ia occurs locally in the BBM. The secondary chromite II is enriched in Cr and impoverished in Al (Cr# 0.57-0.69), it replaces chromite I. Both chromite I and II contain small amounts of Ti (<0.14 wt% TiO₂). Silicate inclusions in chromite are scarce. The composition and mode of occurrence of both the GJSM and the BBM chromitites are similar, thus they were formed probably under the same conditions. Textures of the chromitites suggest their magmatic origin. Their current geological position indicates their emplacement and crystallization in the uppermost mantle harzburgites occurring below the Moho Transition Zone (MTZ). The chromitites and hosting harzburgites were subjected to the greenschist-facies metamorphic overprint. The moderate Cr# and low PGEs contents suggest that the chromitites originated in the arc setting, thus their host ophiolite is of supra-subduction type.

Słowa kluczowe

ophiolite chromitite platinum group elements PGE supra-subduction setting Variscan orogeny

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2016

Tom

Vol. 60, No. 1

Strony

56--66

Opis fizyczny

Bibliogr. 44 poz., rys., wykr.

Twórcy

autor

Wojtulek P. M.

piotr.wojtulek@interia.pl

University of Wrocław, Institute of Geological Sciences, pl. M. Borna 9, 50-204 Wrocław, Poland

autor

Puziewicz J.

University of Wrocław, Institute of Geological Sciences, pl. M. Borna 9, 50-204 Wrocław, Poland

autor

Ntaflos T.

University of Vienna, Department of Lithospheric Research, Althanstrasse 14, 1090 Vienna, Austria

autor

Bukała M.

University of Wrocław, Institute of Geological Sciences, pl. M. Borna 9, 50-204 Wrocław, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-6b1da90e-a971-4584-b2b8-d432b4b4bcfd