RESEARCH PAPER
First note on marine-like cementation of Late Holocene beachrock, Iznik Lake (Turkey)
1
Department of Geography, Canakkale Onsekiz Mart University, TR-17100, Canakkale, Turkey
2
Department of Physics, Işık University, TR-34980, Şile, Istanbul, Turkey
3
Department of Geology Engineering, Canakkale Onsekiz Mart University, TR-17020, Canakkale, Turkey
Online publication date: 2011-12-25
Publication date: 2012-03-01
Geochronometria 2012;39(1):76-83
KEYWORDS
ABSTRACT
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.
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