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| Titel |
Geometry of the Turkey-Arabia and Africa-Arabia plate boundaries in the latest Miocene to Mid-Pliocene: the role of the Malatya-Ovacik Fault Zone in eastern Turkey |
| VerfasserIn |
R. Westaway, T. Demir, A. Seyrek |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1815-381X
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| Digitales Dokument |
URL |
| Erschienen |
In: eEarth ; 3, no. 1 ; Nr. 3, no. 1 (2008-08-05), S.27-35 |
| Datensatznummer |
250000778
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| Publikation (Nr.) |
 copernicus.org/ee-3-27-2008.pdf |
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| Zusammenfassung |
| We suggest a working hypothesis for the geometry of the strike-slip faults
that formed the boundaries between the Turkish, African and Arabian plates
in the latest Miocene to Mid-Pliocene (LMMP), between ~7–6 Ma and
~3.5 Ma. This geometry differed significantly from the modern
geometry; the northern Dead Sea Fault Zone (DSFZ) was located east of its
present line and the TR-AR boundary was formed by the Malatya-Ovacık
Fault Zone (MOFZ), located well north of the modern East Anatolian Fault
Zone (EAFZ). The MOFZ is potentially the most problematic aspect of such a
scheme, given the dramatically different interpretations of it that have
been proposed. However, the presently-available evidence, albeit limited, is
consistent with our proposed interpretation. Significant differences between
the proposed LMMP fault geometry and the modern geometry include, first, the
transtensional geometry of the MOFZ, the modern EAFZ being typically a
left-lateral transform fault zone but with localized transpression. Second,
the MOFZ slip rate was much lower than the ~9–10 mm a−1 EAFZ slip
rate; it is estimated as ~2–3 mm a−1, having produced no more
than ~8 km of slip during its approximately three million year long
activity. The Euler vector is tentatively inferred to have involved relative
rotation between the Turkish and Arabian Plates at ~0.85±0.15° Ma−1 about a pole at
~37.75±0.15° N, ~38.8±0.3° E. Third, unlike at present, there was no throughgoing linkage of
left-lateral faulting between the LMMP DSFZ and the MOFZ; instead, the DSFZ
terminated northward, and the MOFZ terminated southward, in a zone of
localised crustal shortening adjoining the suture of the former Neotethys
Ocean in the Kahramanmaraş-Pazarcık region of SE Turkey. The
different motion of the Turkish plate relative to Arabia, and, thus,
relative to Eurasia, means that senses and rates of crustal deformation can
be expected to have been different during the LMMP phase from at present,
throughout the eastern Mediterranean region. |
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