Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)

Lüdecke, Tina

doi:10.3906/yer-1207-11

Cited by 20 publications

(36 citation statements)

References 74 publications

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“…Miocene marine sedimentary rocks are distributed across portions of Anatolia, which implies that modest topographic relief existed at this time (Figure b and Table ; Bartol & Govers, ; Cipollari et al, ; Cosentino et al, ; Hüsing et al, ; Poisson et al, ; Schildgen et al, , 2014). This implication is consistent with stable isotopic compositions of sediment samples from continental basins across Central Anatolia, which indicate a lack of significant orographic barriers until middle Miocene times (Lüdecke et al, ; Schemmel et al, ). These observations indicate that negligible topographic elevation is a reasonable starting condition.…”

Section: Inverse Modeling Of River Profilessupporting

confidence: 80%

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

McNab

Ball

Hoggard

et al. 2018

Geochem Geophys Geosyst

102

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It is agreed that mantle dynamics have played a role in generating and maintaining the elevated topography of Anatolia during Neogene times. However, there is debate about the relative importance of subduction zone and asthenospheric processes. Key issues concern onset and cause of regional uplift, thickness of the lithospheric plate, and the presence/absence of temperature and/or compositional anomalies within the convecting mantle. Here, we tackle these interlinked issues by analyzing and modeling two disparate suites of observations. First, a drainage inventory of 1,844 longitudinal river profiles is assembled. This database is inverted to calculate the variation of Neogene regional uplift through time and space by minimizing the misfit between observed and calculated river profiles subject to independent calibration. Our results suggest that regional uplift commenced at 20 Ma in the east and propagated westward. Second, we have assembled a database of geochemical analyses of basaltic rocks. Two different approaches have been used to quantitatively model this database with a view to determining the depth and degree of asthenospheric melting across Anatolia. Our results suggest that melting occurs at depths as shallow as 60 km in the presence of mantle potential temperatures as high as 1400°C. There is evidence that temperatures are higher in the east, consistent with the pattern of subplate shear wave velocity anomalies. Our combined results are consistent with isostatic and admittance analyses and suggest that elevated asthenospheric temperatures beneath thinned Anatolian lithosphere have played a first‐order role in generating and maintaining regional dynamic topography and basaltic magmatism.

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Section: Inverse Modeling Of River Profilessupporting

confidence: 80%

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

McNab

Ball

Hoggard

et al. 2018

Geochem Geophys Geosyst

102

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“…1B). Lüdecke et al (2013) attributed the earlier, wetter conditions to the absence of significant orographic barriers to precipitation along the northern and southern plateau margins during the early to middle Miocene. This interpretation is in concert with the aforementioned view of major uplift of the central Taurides in the south, which started in the latest Miocene.…”

Section: What About External Factors?mentioning

confidence: 96%

“…According to palynological and isotopic data, central Turkey experienced a humid subtropic climate during the Oligo-Miocene period (Akgün et al, 2007;Lüdecke et al, 2013). The mean annual paleoprecipitation values exceeded 1300-1200 mm/yr during the early Miocene and decreased to below 1000 mm/yr in the late Miocene, which represents the lowest values of the country today, with amounts of 300-600 mm/yr (Akkiraz et al, 2011;Fig.…”

Section: What About External Factors?mentioning

confidence: 98%

“…1B). However, according to sedimentological, paleontological, and geochemical studies, the Central Anatolia region was a relatively humid region during the early Neogene, and it gradually turned into an arid region (e.g., Erol, 1969;Akgün et al, 2007;Akkiraz et al, 2011;Lüdecke et al, 2013). In this scene, some authors have suggested that the most important factor controlling this climatological evolution was the global climatic changes during the Neogene-Quaternary periods (e.g., Erol, 1969).…”

Section: Introductionmentioning

confidence: 96%

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Genetic framework of Neogene–Quaternary basin closure process in central Turkey

Gürbüz

Kazancı

2015

Lithosphere

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Central Turkey represents the only orogenic plateau in the Mediterranean region. Also, the largest closed drainage basin and the largest intracontinental basin of Turkey, the Lake Tuz Basin, is located in this region. Results from a three-dimensional (3-D) computer modeling study of the Lake Tuz Basin indicate a southward-deepening freshwater lake basin with great depth in the Mio-Pliocene, which regressed toward the north during the Plio-Quaternary into the shallow saline lake basin it is today. The spatio-temporal variations of Neogene and Quaternary deposits reflect the main effects of internal forces (isostasy>volcanism>faulting) that were caused by lithospheric slab breakoff and subsequent asthenospheric upwelling under central Turkey. Climatic change played a relatively minor role during these periods and was closely associated with the results of internal forces.

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“…O values, ranging from -8‰ to -12‰ SMOW and -9.99‰ to -11.28‰ SMOW, were obtained by Lüdecke et al (2013) for present-day meteoric waters on the plateau in central Anatolia and by Yıldız et al (2008) in a neighbouring area, respectively. In Figure 10, the δ 18 O values of the calcrete samples are similar to those of the lacustrine carbonate samples, indicating deposition in a shallow lake or at the lake margin, where carbonates were affected by subaerial exposure.…”

mentioning

confidence: 91%

Geology, mineralogy, geochemistry, and depositional environment of a Late Miocene/Pliocene fluviolacustrine succession, Cappadocian Volcanic Province, central Anatolia, Turkey

Göz¹,

Kadır²,

Gürel³

et al. 2014

Turkish J Earth Sci

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has been provided concerning the local palaeoclimates, and the effects of the Messinian Salinity Crisis on terrestrial areas surrounding the Mediterranean Sea are currently a matter of discussion. Therefore, the goals of this paper are to describe the mineralogy, geochemistry, and depositional environment of the Late Miocene/Pliocene fluviolacustrine deposits and associated palaeosols and calcretes within the CVP and to interpret the palaeoenvironmental and palaeoclimatic evolution data.

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Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)

Cited by 20 publications

References 74 publications

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

Genetic framework of Neogene–Quaternary basin closure process in central Turkey

Geology, mineralogy, geochemistry, and depositional environment of a Late Miocene/Pliocene fluviolacustrine succession, Cappadocian Volcanic Province, central Anatolia, Turkey

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