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Title: Plio-quaternary sediments and neotectonics of the Isparta angle, S.W. Turkey
Author: Glover, Clare Paula
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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An integrated approach, combining sedimentology, structural geology and geomorphology, has been used to reconstruct the Pliocene and Quaternary evolution of the Aksu basin, located on the Mediterranean coast of Turkey. The present basin opened in the Lower Miocene (Flecker, PhD, 1995). The shallow marine, bioclastic Gebiz Limestone, originally thought to be Messinian in age is believed to date from the late Miocene (late Tortonian/early Messinian). Selenitic gypsum in the Aksu basin is related to the Messinian dessication of the Mediterranean Sea, which produced widespread evaporite deposits. Right-lateral shear is recognised during the late Miocene-early Pliocene. Pre-existing structural lineaments, that were orientated sub-parallel to the shear direction, were reactivated as right-lateral shear zones. Between these defined lineaments broader zones of distributed shear are thought to have deformed by clockwise rotation of small blocks bounded by sinistral fault planes. Flooding of the Mediterranean at the beginning of the Pliocene resulted in deposition of the Yenimahalle Formation. The onshore sediments of the Yenimahalle Formation are dated as Globorotalia puncticulata-Globorotalia margaritae zone, using planktic foraminifera. Benthic foraminifera assemblages show that maximum water depth at this time was of the order of 150m. Seismic profiles in Antalya Bay indicate that the Pliocene sediment package is approximately 500m thick and that it was deposited onto a block-faulted topography. Three transgressive phases are recognised, that can be related to eustatic sea-level changes during the Lower Pliocene highstand. The Yenimahalle Formation shallows and coarsens upwards in the upper 25m of section. The sediments change from blue-grey silts to yellow sands containing gravel lenses, shallow-water burrows and large macrofossils. The benthic foraminifera assemblage of the upper part of the section indicates a water depth of 50m or less. The Yenimahalle Formation grades into the Çalkaya Formation. This consists of non-marine fanglomerates in the far north; braided stream deposits in the northern Aksu basin; and deltaic marine and transitional marine deposits (marine sands and conglomerates, muds, soils and coals) in the south. A tuff deposit in the Çalkaya Formation is interpreted as the basal surge deposit of a small phreatomagmatic eruption. K-Ar dates from biotites extracted from pumice clasts in the tuff were inconclusive, due to excess atmospheric argon.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available