Origin and geodynamic implications of basaltic rocks intercalated with Miocene turbidites around the Iskenderun Basin (Eastern Mediterranean / Turkey)
Yükleniyor...
Tarih
2023
Yazarlar
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Yayıncı
Pergamon-Elsevier Science Ltd.
Erişim Hakkı
info:eu-repo/semantics/embargoedAccess
Özet
We report a detailed investigation and the geodynamic implications of a basaltic lava flow that is intercalated with the early-middle Miocene turbiditic sedimentary rocks (Karatas, Formation) that are exposed near the Iskenderun Basin in southern Turkey. In order to reveal the age and origin of the basaltic rocks, we systematically sampled clastic samples from measured sedimentary sections, which include the basaltic lava flow, from around Ceyhan (east of Adana city). Forty different species belonging to 14 calcareous nannoplankton genera were identified in the samples, representing the Langhian-Tortonian (middle-late Miocene) time interval. Considering the stratigraphic distribution of the calcareous nannoplankton species in the section, the age of the basaltic lava flow is determined to be Serravallian (middle Miocene). The basaltic rocks experienced only minor magmatic evolution and have a restricted compositional range. Analysed in situ major element contents (from electron microprobe analysis, EMPA) for minerals (plagioclase, olivine and clinopyroxene) hosted by the late Miocene basaltic rocks show that they originated in an intraplate setting. Geochemical analysis indicates that olivine have Fo (forsterite) compositions between 57.81% and 83.83%. The EMPA contents (primarily based on pyroxenes) suggests that the late Miocene volcanism was related to the Pleistocene Delihalil-Turunclu basaltic volcanism. The studied late Miocene volcanism could have originated in two possible tectono-magmatic environments: 1) one involving collisional tectonics (e.g., folding) combined with a change from regional compression to strikeslip; or 2) an intraplate setting. We propose that the tectonic setting of the late Miocene basaltic lava flow was similar to that of the extensive Pleistocene Delihalil volcanism in the same region. This would extend the onset of the regional basaltic volcanism back to the middle-late Miocene, rather than being restricted to the Pleistocene-Quaternary.
Açıklama
Anahtar Kelimeler
Iskenderun Basin, Karatas¸ Formation, Basaltic Lava, Calcareous Nannoplankton, Mineral Chemistry
Kaynak
Journal of African Earth Sciences
WoS Q Değeri
Q3
Scopus Q Değeri
Q1
Cilt
198
