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Petrology and Metamorphism of Amphibolites with Corundum from Prijepolje, Serbia

Explore the geological features of amphibolites containing corundum from Prijepolje in southwestern Serbia, within the Dinaridic Ophiolite Belt. Discover the mineral composition and degrees of metamorphism, along with the formation processes of corundum. Analyze the tectonic contacts and field observations to understand the metamorphic history of these rocks.

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Petrology and Metamorphism of Amphibolites with Corundum from Prijepolje, Serbia

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  1. Milovanović Dragan., Eric Suzana., SekeLajos. Petrology and metamorphism of amphibolites with corundum from Prijepolje , Dinaridicophiolite Belt (Southwestern Serbia)

  2. Geographic position of Serbia on Balkan Peninsula K A R PA T H O A L P S B A L K A N I D I N A R I D E S D E S A P E N I N E S

  3. The Mesozoic ophiolites in Serbia TISSIA Belgrade Vardar zone Jadar block Vardar zone Amphibolites with corundum Dinarideophiolite belt Drina Ivanjica terran Vardar zone

  4. The Mesozoic ophiolites in Serbia TISSIA Pillow lavas Belgrade Vardar zone Triassic limestone Jadar block Triassic limestone Zlatiborperidotites Vardar zone Amphibolites with corundum Amphibolites with corundum Dinarideophiolite belt Drina Ivanjica terran Peridotites Vardar zone Ophioliticmelange

  5. The field trip observations • Amphibolite with corundum occur as lens, up to 100 m. thick • tectonic contact with surroundig rocks, peridotites and mafic granulites Amphibilite with corundum Peridotites with Gr-Cpi veins Mafic granulites Fault Fault 500 m

  6. Mineral composition The field trip observations • Amphibolite with corundum occur as lens, up to 100 m. thick • tectonic contact with surroundig rocks, peridotites and mafic granulites

  7. Mineral composition Plagioclase with 92.9-98.9% An (average 95.18) Piroxene Plagioclase Amphibole

  8. Mineral composition Rock composition Corundum contain 0.085-0.161% Cr2O3 Corundum

  9. Rock composition

  10. Degrees of metamorphism Experimental constraints S&D 94 P (kbar) W&N 91 Amphibole - plagioclase geothermometer (Blundy and Holland, 1990) Qtz-absent Grt Qtz-present 16 Hbl Cpx Pl Qtz L Cpx Qtz R 93 Hbl Grt P&B 95 Pl 8-12 kB, 820-10500C Pl L C 88 Qtz 12 Opx V E&T 86 R 91 W&W 94 8 Al content in Ho ( Hammerstorm and Zen, 1986) N&C 00b N&C 00a P 68, J 78 and WW 93 Hbl Opx Pl Cpx Qtz 4 L 6-12 kB P&B 95 Hbl+Qtz= Opx+Cpx+Pl+V B&L 91 B 69 CWT 67 S 81 0 400 T (0C) 800 600 1000

  11. Degrees of metamorphism The genesis of Corundum: As a residue after partial melting as one of the liquides phases, with clinopyroxene and spinel orclinopyroxene and garnet for gabbroic anorthosite (Raheim&Green, 1974) Metamorphic origin by reaction spinel+anorthite = corundum+diopside in rocks with sufficiently high Al2O3 content, e.g. a troctolitic protholith This reaction needs spinel as one of the reactants, which may be formed by the raction olivine + plagioclase = orthopyroxene + clinopyroxene + spinel. (Kushiro&Yoder,1966) The maximum P-T condition still remains open. The most common mineral assemblage in the upper amphibolite facies for metabasites is Hbl+Pl±Qtz, with or without either Cpx or garnet. Replacement of Hbl+Pl±Qtz by combinations of Cpx, Pl +corundum is the main task of this study.

  12. Protolith Subduction ? Eu and Sr positive anomalies reflect plagioclase accumulation, protolith have a cumulus origin (olivine gabbro ?) High Cr content (783-1090 ppm) imply formation from not evolved liquids. Whole-rock and mineral chemical compositions of AmC havecumulus origin, with a primary (?) mineral assemblage controlled by crystalization of olivine, plagioclase and clinopyroxene,as residue from primitive mantle (MORB source mantle ?).

  13. Protolith Eu and Sr positive anomalies reflect plagioclase accumulation, protolith have a cumulus origin (olivine gabbro ?) High Cr content (783-1090 ppm) imply formation from not evolved liquids. Whole-rock and mineral chemical compositions of AmC havecumulus origin, with a primary (?) mineral assemblage controlled by crystalization of olivine, plagioclase and clinopyroxene,as residue from primitive mantle (MORB source mantle ?).

  14. Conclusions: Whole rock compositions, with positive Eu and Sr anomalies indicate that protoliths of Amc have a basic composition, olivine gabbro cumulates (?) After cooling at shallow levels olivin gabbro cumulates, together with surrounding peridotites undergone subduction and metamorphose under amphibole-granulite-eclogite facies, most probably related with Jurassic subduction during formation of Dinaridic ophiolite belt. During uplift and tectonical emplacement (closing of ocean space) the AmC was dismembered, forming fragments which were included in the ophiolite melange. The absence of thermal relaxation features in Amc require rapid exhumation. Amphibilite with corundum Peridotites with Gr-Cpi veins Mafic granulites

  15. Conclusions: Ophiolites in Serbia and surrounding countries Dinaridic Vardarzone ophiolite belt Degrees of metamorphism of AmC and relation withultramafic rocks is one of the important questions in genesis and emplacement of Dinaridic ophiolite belt.

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