1. Petrology and metamorphism of amphibolites
Milovanović Dragan.,
Eric Suzana.,
Seke Lajos.
Petrology and metamorphism of amphibolites
with corundum from Prijepolje , Dinaridic ophiolite
Belt (Southwestern Serbia)

2. Geographic position of Serbia on Balkan Peninsula
T H
K A R
P A A
B A L K
E S O
N I D
A L P S
D I N A R I 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
Dinaride ophiolite belt
Drina Ivanjica
terran
Vardar zone

4. The Mesozoic ophiolites in Serbia TISSIA
Pillow lavas
Belgrade
Vardar zone
Triassic limestone
Jadar
block
Triassic
limestone
Zlatibor peridotites
Vardar zone
Amphibolites
with corundum
Amphibolites
with corundum
Dinaride ophiolite belt
Drina Ivanjica
terran
Peridotites
Vardar zone
Ophiolitic melange

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. Rock composition Mineral composition
Corundum contain % Cr2O3
Corundum

9. Rock composition

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

11. Degrees of metamorphism
The genesis of Corundum:
As a residue after partial melting as one of the liquides phases, with clinopyroxene and
spinel or clinopyroxene 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 ( ppm) imply formation from not evolved liquids.
Whole-rock and mineral chemical compositions of AmC have cumulus 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 ( ppm) imply formation from not evolved liquids.
Whole-rock and mineral chemical compositions of AmC have cumulus 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. Ophiolites in Serbia and surrounding countries
Conclusions:
Ophiolites in Serbia and surrounding countries
Dinaridic
Vardar zone
ophiolite
belt
Degrees of metamorphism of AmC and relation with ultramafic rocks is one of the important questions in genesis and emplacement of Dinaridic ophiolite belt.