Submarine fan and slope-apron deposition in a Cretaceous Forearc Basin: The Gürsökü Formation (Kavak–Samsun, N. Turkey)

Akdağ, Kemal; Kırmacı, M. Ziya

doi:10.1016/j.jseaes.2007.05.005

Cited by 5 publications

(3 citation statements)

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“…Forty‐three paleocurrent measurements were made using mainly unidirectional indicators from 38 flute casts and bidirectional (linear) indicators from five groove casts from five locations through the Campanian‐Maastrichtian sequence (Figure and Table S1). Paleoflow direction L6 is from Leren () and L7 is from Akdağ and Kırmacı ().…”

Section: Resultsmentioning

confidence: 99%

“…Counterclockwise back rotations of 20° were applied for locations L4 and L5. Counterclockwise back rotations of 20° and 40° were applied to paleoflow directions from locations L6 (Leren, ) and L7 (Akdağ & Kırmacı, ), respectively. However, there is no major change between most of the nonrotated and back rotated paleocurrent directions due to low rotation angles (Meijers et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Geological maps of the central Pontides showing the distribution of the Lower Cretaceous and Campanian‐Maastrichtian turbidites, the paleocurrents, and sample locations used for U–Pb dating (modified after Akdoğan et al, ; Hakyemez & Papak, ; Uğuz et al, ). (a) Paleoflow directions of the Campanian‐Maastrichtian turbidites are from this study, Leren (), and from Akdağ and Kırmacı () and those of the Lower Cretaceous turbidites are from Akdoğan et al (). (b) All paleoflow directions were back‐rotated according to Meijers et al ().…”

Section: Introductionmentioning

confidence: 90%

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Striking Variation in the Provenance of the Lower and Upper Cretaceous Turbidites in the Central Pontides (Northern Turkey) Related to the Opening of the Black Sea

2019

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The Lower and Upper Cretaceous turbidites cover large areas in the central Pontides (north-central Turkey). The Lower Cretaceous turbidites are over 2 km thick and are exposed in an area of 400 × 90 km. The Upper Cretaceous (Campanian-Maastrichtian) forearc turbidites are up to 1,200 m thick and crop out in NW-SE trending elongate basins about 40 km wide, extending along the central and eastern Pontides. We present new detrital zircon U-Pb ages, petrography, and paleocurrent measurements from the Campanian-Maastrichtian turbidites and compare them to those from the Lower Cretaceous turbidites. The Campanian-Maastrichtian sandstones are dominated by carbonate and magmatic lithic grains. The paleocurrents indicate paleoflow directions parallel to the axis of the basin. The sandstones are dominated by Late Cretaceous zircons indicating derivation mainly from the coeval magmatic arc. In contrast, the Lower Cretaceous sandstones are dominated by quartz and feldspar, and paleocurrents indicate southward transport. The detrital zircons in the Lower Cretaceous sandstones are mainly Archean and Paleoproterozoic, indicating that in the Early Cretaceous, the source of turbidites was from the Archean-Paleoproterozoic Ukrainian Shield to the north. After the opening of the Black Sea in the Late Cretaceous, the connection between the Pontides and the East European Platform was severed and the Campanian-Maastrichtian turbidites were sourced principally from the magmatic arc in the Pontides. Our results indicate that the Campanian-Maastrichtian turbidites represent the first turbiditic sequence deposited after the opening of the Black Sea.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%