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First note on marine-like cementation of late Holocene Beachrock, Iznik Lake (Turkey)

Erginal A. E., Kiyak N. G., Ozturk M. Z., Yigitbas E.

Geochronometria

2012

Vol. 39, no. 1

76-83

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 con-taining 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 4.226š0.569 ka on the lowermost beds to 0.706š0.081 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 cli-matic optimum to the last millennia.