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| Titel |
The Age and Geodynamic Evolution of the Metamorphic sole rocks from Izmir-Ankara-Erzıncan suture zone (Northern-Turkey) |
| VerfasserIn |
Rahmi Melih Çörtük, Ömer Faruk Çelik, Mutlu Özkan, Sarah C. Sherlock, Andrea Marzoli, İsmail Emir Altıntaş, Gültekin Topuz |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127178
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| Publikation (Nr.) |
 EGU/EGU2016-7021.pdf |
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| Zusammenfassung |
| The İzmir-Ankara-Erzincan suture zone in northern Turkey is one of the major tectonic
zones separating the Pontides to the North from the Anatolide-Tauride block and Kı
rşehir Massif to the South. The accretionary complex of the İzmir-Ankara-Erzincan
suture zone, near Artova, is composed mainly of peridotites with varying degree
serpentinization, metamorphic rocks, basalt, sandstones, pelagic and neritic limestones. The
metamorphic rocks are represented by amphibolite, garnet micaschit, calc-schist and
marble.
The metamorphic rocks were interpreted as the metamorphic sole rocks. Because; (i)
They are tectonically located beneath the serpentinized peridotites. (ii) Foliation planes of
both the amphibolites and mantle tectonites are parallel to each other. (iii) The metamorphic
rocks are crosscut by non-metamorphic dolerite dikes which exhibite Nb and Ta depletion
relative to Th enrichment on the N-MORB normalized multi-element spider diagram. The
dolerite dikes display flat REE patterns (LaN/YbN=0.85-1.24). These geochemical
signatures of the dolerite dikes are indicative of subduction component during their
occurrences.
Geochemical observations of the amphibolites suggest E-MORB- and OIB-like signatures
(LaN/SmN= 1.39-3.14) and their protoliths are represented by basalt and alkali basaltic
rocks. Amphiboles from the amphibolites are represented by calcic amphiboles
(magnesio-hornblende, tchermakite and tremolite) and they yielded 40Ar-39Ar ages
between 157.8 ± 3.6 Ma and 139 ± 11 Ma. These cooling ages were interpreted to be
the intra-oceanic subduction/thrusting time of the İzmir-Ankara-Erzincan oceanic
domain.
This study was funded by TÜBİTAK (Project no: 112Y123). |
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