First note on marine-like cementation of Late Holocene beachrock, Iznik Lake (Turkey)
AuthorErginal, Ahmet Evren
Kıyak, Nafiye Güneç
Öztürk, Muhammed Zeynel
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CitationErginal, A. E., Kıyak, N. G., Öztürk, M. Z., Yiğitbaş, E., Bozcu, M., Avcıoğlu, M. & Öztürk, B. (2012). First note on marine-like cementation of late holocene beachrock, iznik lake (turkey). Geochronometria, 39(1), 76-83. doi:10.2478/s13386-011-0053-2
Micro-fabric characteristics and optically stimulated luminescence (OSL) dating results are presented to discuss the controlling agents and timing of beachrock cementation on the fresh-water Iznik Lake shoreline. The beachrocks are made up of grain-supported polygenic conglomerate containing 20.42% carbonate with encrusted grains, basically as micrite coatings, isopachous aragonite rims, cryptocrystalline void fills and meniscus bridges. The optical ages of twelve samples yielded ages that range from 4.226 +/- 0.569 ka on the lowermost beds to 0.706 +/- 0.081 on the uppermost. This is the first report of precipitation of marine-like cements in Iznik Lake. The abundant aragonite-dominated cement is likely indicative of precipitation-prone dry evaporative conditions from the climatic optimum to the last millennia.