Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Yazarlar: Ali GÜREL

Konular:Mühendislik

DOI:10.28948/ngumuh.502050

Anahtar Kelimeler:Cappadocıan Volcanic Province,Late Miocene,Climate,Geological proxies

Özet: The Messinian salinity crisis in the marine Mediterranean Sea area has been studied from widely different perspectives. Nevertheless, non-marine paleoenvironmental and paleoclimatic records of the late Miocene surrounding the Mediterranean area are very limited in their spatial range. The paleosols and fluvio-lacustrine sedimentary rocks (limestone, marlstone and diatomite) of Bayramhacılı Member of Ürgüp Formation in Güllüdere Section were examined using polarized-light microscopy, X-ray diffractometry (XRD) as well as by chemical methods. Red colored paleosols formed within these terrestrial sedimentary rocks under near surface or surface conditions, and comprise predominantly of smectite ± illite with feldspar, quartz, opal-CT, serpentine and amphibole. Micomorphological development of flaky smectite edges illite on and between devitrified volcanic glass and relict feldspar crystal reveals in-situ precipitation based on dissolution and precipitation mechanisms. The sedimentary rocks such as limestone, marlstone and diatomite formed in lacustrine environment. The alteration of the ignimbrites caused the depletion of Si, and increase of Al+Fe+Mg, Ti, and K (and related Ba+Sr) favored precipitation of smectite ± illite in paleosols. The appearance of limestone, marlstone and diatomite from the upper profile level is suggestive of a shift to more arid or more seasonal conditions that is equivalent with a prominent change in sediment provenance and these indicate decrease in sedimentation rate during the latter part of the Messinian age.

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