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The Austridic eclogites, metabasites and metaultrabasites from the Pohorje area (Eastern Alps, Yugoslavia): 1. The eclogries and related rocks

Le eclogiti, metabasiti e metaultrabasiti austroalpine dell’area di Pohorje (Alpi Orientali, lugoslavia): l. Le eclogiti e rocce ad esse correlate

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Abstract

Petrography, petrology, mineral chemistry, metamorphic evolution and geothermo-barometric estimations concerning the Pohorje eclogites are discussed. These rocks record a three-stage metamorphic evolution: (0 an older, dry, high-pressure/high-temperature recrystallization (eclogite stage);(ii) a later, lower-pressure/lower temperature symplectite stage, partly developed under granulite faciès conditions;(iii) a younger, epidote-amphibolite overprint. The latter water-controlled recrystallization is believed to be Alpine. However, the main part of the metamorphic history is to be considered pre-Alpine: such chronological classification is consistent with the prevailing interpretation concerning similar Austridic rocks in the Eastern Alps.

Riassunto

Le eclogiti dell’area di Pohorje vengono studiate dal punto di vista petrografico, petrologico, della composizione delle fasi mineralogiche e dell’evoluzione metamorfica. Tale evoluzione risulta articolata in tre stadi: (i) una antica ricristallizzazione in ambiemte anidro, sotto alte T eP (stadio eclogitico);(ii) un successivo stadio simplettitico, a più basseT e P, svoltosi nella sua ultima parte in condizioni granulitiche;(Hi) una sovrimpronta recente in facies delle anfiboliti ad epidoto. Quest’ultima ricristallizzazione in presenza di H2O viene ritenuta Alpina, mentre la parte principale della storia metamorfica di queste eclogiti viene ritenuta pre-Alpina. Tale classificazione cronologica è in accordo con le prevalenti interpretazioni riguardanti simili rocce del basamento Austridico delle Alpi Orientali.

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Authors and Affiliations

  1. Geoloski Zavod Parmova, 33 - Ljubljana, Iugoslavia

    Ana Hinterlechner-Ravnik

  2. Dipartimento di Mineralogia, Petrologia Università degli Studi di Padova Corso G., Garibaldi, 37, - 35137, Padova

    Francesco P. Sassi & Dario Visonà

Authors
  1. Ana Hinterlechner-Ravnik
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  2. Francesco P. Sassi
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  3. Dario Visonà
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Nella seduta del 15 dicembre 1990.

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Hinterlechner-Ravnik, A., Sassi, F.P. & Visonà, D. The Austridic eclogites, metabasites and metaultrabasites from the Pohorje area (Eastern Alps, Yugoslavia): 1. The eclogries and related rocks. Rend. Fis. Acc. Lincei 2, 157–173 (1991). https://doi.org/10.1007/BF03001419

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