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The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of İstanbul

The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of İstanbul,10.1016/j.margeo.2007.04.010,Marine Geolo

The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf south of İstanbul   (Citations: 16)
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High-resolution seismic reflection profiles and analyses of the sedimentary substrate at the Sea of Marmara (SoM) entrance to the Strait of İstanbul (SoI, Bosphorus) provide a detailed record of the transgression that took place after the SoM reconnected with the Mediterranean. The sediments progressively fill a paleo shelf valley that incised the margin from the SoI to the shelf break at the time of the pre-Holocene lowstand. We map seven seismic reflection units that can be confidently correlated to sediment cores by lithology and physical properties. Sediments in the cores are dated by radiocarbon methods. Early channel and levee deposits within the paleo valley belong to the Younger Dryas cold stage and record outflow from the Black Sea via the SoI. Small clinoform packages on the valley margin formed in proximity to climbing paleo shorelines. The elevations of these deposits conform to the sealevel history recorded in Barbados corals. The younger part of the succession includes a subaqueous prodelta sourced from the Kurbağalıdere River. Its relatively young age when the Holocene sea had almost reached its modern level suggests that the thick progradational and aggradational clinoform development was primarily a response to sediment supply rather than the filling of expanding accommodation space. Our findings refute the hypothesis of Aksu et al. (Aksu, A.E., Hiscott, R.N., Mudie., P.J., Rochon, A., Kaminski, M.A., Abrojano, T., Yaşar, D., 2002a. Persistent Holocene outflow fromn the Black Sea to the Eastern Mediterranean contradicts Noah's Flood hypothesis, GSA Today 10,(6), 3–7., Aksu, A.E., Hiscott, R.N., Kaminski, M.A., Mudie, P.J., Gillespie, H., Abrojano, T., Yaşar, D., 2002b. Last glacial–Holocene paleoceanography of the Black Sea and Marmara Sea: stable isotopic, foraminiferal and coccolith evidence. Mar. Geol., 190, 119–149.) and Hiscott et al. (Hiscott, R.N., Aksu, A.E., Yaşar, D., Kaminski, M.A., Mudie, P.J., Kostylev, V.E., MacDonald, J.C. Isler, F.I., Lord, A.R., 2002. Deltas south of the Bosphorus Strait record persistent Black Sea outflow to the Marmara Sea since ∼10 ka, Mar. Geol., 190, 95–118., Hiscott, R.N., Aksu, A.E., Mudie., P.J., Kaminski, M.A., Abrajano, T., Yaşar, D., Rochon, A., 2007. The Marmara Sea gateway since ∼16 ky BP: non-catastrophic causes of paleoceanographic events in the Black Sea at 8.4 and 7.15 ky BP. In Yanko-Hombach,V., Gilbert, A.S., Dolukhanov, P.M. (Eds.), The Black Sea Flood Question, Springer, The Netherlands, 89–117.) that this deposit was supplied from the SoI and that its presence requires a persistent Black Sea outflow since 10 14C ka bp (not corrected from the reservoir age or calibrated).
Journal: Marine Geology - MAR GEOLOGY , vol. 243, no. 1, pp. 57-76, 2007
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    • ...2) Their objection that the age calibration of 6.2 to 3.8 ka for the Unit 2 delta (Eriş et al., 2007) is too young when compared to the earlier calibration of 10 to 9 ka (Hiscott et al., 2002, 2007)...
    • ...3) Their contention that the -83m sill depth in the Dardanelles (Çanakkale) Strait (Eriş et al., 2007) is too deep compared to their -67 ± 3 m elevation...
    • ...The dip directions of Gökaşan et al. (2002) agree with those independently measured by Eriş et al. (2007) and reveal a radial pattern of sediment distribution emanating from the Kurbağalıdere Bay...
    • ...This change happens the same time in the past (~8.4 ka) as the 6-fold increase in the age-depth model of Core MD-2750 (Eriş et al., 2007), located just 2.8 km away on the floor of the Bosporus shelf valley...
    • ...The change in Core MD-2750 occurs at the boundary between Units 3 and 4 of Eriş et al. (2007)...
    • ...These authors match this boundary to their reflector C. However, the change lithologic and sedimentation rate change in Core MAR98-09 occurs at 50 cm and is calibrated by Hiscott et al. (2002) to a different and more shallow reflector — namely the 1 reflector as drawn in Fig. 10 in the Hiscott et al. (2002) publication which is equivalent to reflector A of Eriş et al. (2007)...
    • ...The calibration of the Core MD-2750 age-model of Eriş et al. (2007) to reflectors 1 and 2 does not have such un certainty...
    • ...Apparently an inferred age can trump not only an actual 11.5-10.5 ka age obtained by sampling (Eriş et al., 2007) but also measurements of the sill using reflection profiling...
    • ...No wonder that Hiscott et al. (2007) are adamant in dismissing the deeper -83m value in Eriş et al. (2007) because it is the main defense for their ~16 to 14.7 age allegation for the Unit 5 delta 1...
    • ...Thus there should be no surprise that the depth of the shoreline coincides with the outlet (a subsequent inlet) depth used by Eriş et al. (2007)...
    • ...The cascade eroded a subaerial valley deep into Paleozoic bedrock (Fig 6). The mapping of subsurface of the modern Strait with reflection profiles (Ryan et al, 2006; Yaltırak et al., 2000, 2002) has located a sill in the bare rock at an elevation of -85 m. Contrary to the assertions of Hiscott et al. (2008), none of the discussion above or in the publication of Eriş et al. (2007) rule out episodes of pre-12 ka evaporative drawdown of the ...
    • ...Our reply simply points out that the strata under examination have been directly sampled and dated by Eriş et al. (2007) at locations and at subbottom levels not obscured by seafloor reverberation...

    K. K. Erişaet al. Reply to Comment on “The timing and evolution of the post-glacial tran...

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