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| Titel |
A Paleomagnetic Study of Late Cretaceous Ophiolites in SE Turkey:
implications for palaeolatitudes of S Neotethyan spreading centers and
emplacement-related tectonic rotations |
| VerfasserIn |
Cinku Mualla, Timur USTAOMER, Parlak Osman, Mumtaz Hisarli |
| 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 |
250122115
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| Publikation (Nr.) |
 EGU/EGU2016-1060.pdf |
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| Zusammenfassung |
| Two E-W trending ophiolite belts crop out in SE Turkey, The southerly located ophiolites
(Hatay, Koçali) were emplaced onto the Arabian Platform in Late Cretaceous whereas the
northerly located ophiolites (Göksun, İspendere, Kömürhan, Guleman) were underthrust the
S Tauride margin (i.e. Malatya-Keban Platform) in Late Cretaceous. Different tectonic
models exist in the literature for the origin of these different ophiolite belts that we test here
by a detailed palaomagnetic study: a) all the ophiolites in Turkey, including those in the study
area were rooted from a single ocean basin to the N (i.e. the N Neotethyan Ocean
Basin); b) all the ophiolites in SE Turkey were derived from the S Neotethyan Ocean
Basin; c) the two ophiolite belts in SE Turkey are believed to have rooted from
two different ocean basins; the Berit ocean to the north and the S Neotethys to the
S.
Our palaeomagnetic study from 72 different sites was focused on to the sheeted dyke
complex, cumulate gabbros and extrusive sequences where available of each ophiolite from
the N and S belts. We also sampled the unconformable cover units to distinguish
emplacement related tectonic rotations from post-emplacement tectonic rotations. Here we
report our first results obtained from the Göksun Ophiolite of the northern belt and the Hatay
Ophiolite of the southern belt.
Rock magnetic experiments showed evidence od magnetite/titanomagnetite as the
main magnetic carriers at the majority of sites. Progressive thermal and alternating
demagnetization revealed that the characteristic remanent component is removed between
500 and 580 ?C or 30–100 mT, respectively. Our new paleomagnetic results from the
ophiolitic rocks emplaced in Arabian platform and the SE Anatolia show important
implications to the spreading centre of the former ocean (s). Large counterclockwise rotations
up to 100˚ are obtained from the sheeded dykes of the Hatay ophiolite in the Arabian plate
with a paleolatitude of ∼16˚ , in contrast to the sheeded dykes of the Göksun ophiolite
emplaced in the SE Anatolian with clockwise rotation of 90˚ and a paleolatitude of 22˚ .
The relative movement of the ophiolitic series show their emplacement in the different
zones.
This study was financially supported by the project of the Scientific and Technical
Research Council of Turkey (TUBITAK) with Project number 114R024. |
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