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| Titel |
A new chronostratigraphy (40Ar-39Ar and U-Pb Dating) for the Middle Section of the Burdur-Fethiye Shear Zone, SW Turkey |
| VerfasserIn |
İrem Elitez, Cenk Yaltırak, Gürsel Sunal |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137460
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| Publikation (Nr.) |
 EGU/EGU2017-180.pdf |
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| Zusammenfassung |
| There are few basins containing younger rocks along the Burdur-Fethiye Shear Zone,
such as the Burdur, Tefenni, Eşen and Acı göl basins. The middle section of the
Burdur-Fethiye Shear Zone, where Neogene sediments predominate, includes three
modern basins: the Acı payam, Çameli and Gölhisar basins. All these basins represent
portions of larger carbonate lakes. A considerable number of studies suggested
controversial Neogene stratigraphy of these basins and environs. In most cases,
the local river and alluvial fan deposits were mapped together with the lacustrine
sediments. According to most studies, the lacustrine deposits are of Pliocene age,
except in small areas north and east of Acı payam Basin. Our field observations
revealed two distinct young sedimentary sequences that unconformably overlies the
pre-Neogene basement in the middle section of the Burdur-Fethiye Shear Zone. The first
sequence begins with meandering- and braided-river sediments, which transition
upward into lacustrine sediments. The uppermost part of the lacustrine sediments
consists mostly of red-wine-coloured claystones and silty carbonates including
caliche. This sequence is overlain by alluvial fan conglomerates, mudstones and
claystones.
In the northern part of Acı payam Basin at elevations of ∼1500-1600 m, the lamproites
cut or overlie both fluvial conglomerates and lacustrine marls, claystones and limestones. In
addition, a tuff level was found in the lacustrine sediments south-west of Çameli Basin. We
provide new geochronological data from these volcanic rocks. Zircon U-Pb results from tuff
level yielded age of 6.933±0.041 Ma. The lamproites are dated at 5.06±1.44, 5.69±2.34,
6.08±0.48, 6.43±0.29, 6.94±0.35, 6.98±0.31 and 6.88±0.22 Ma by 39Ar/40Ar dating
method.
Consequently, a Messinian age is suggested for the uppermost part of the river deposits.
Field relations show that the lacustrine sediments are upper Miocene-lower Pliocene in age
and the widespread exposures of the lacustrine sediments indicate the presence of an
extensive warm late Miocene lake. This lake likely evaporated due to the Messinian salinity
crisis. After the Messinian, the lake began to break up into smaller lakes as a result of the
evolution of the Burdur-Fethiye Shear Zone. The Acı payam, Çameli and Gölhisar basins are
the parts of this lake. These new ages also allow us to correlate the lacustrine sediments in the
middle part of the Burdur-Fethiye Shear Zone with sedimentary sequences of other basins. |
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