First note on marine-like cementation of Late Holocene beachrock, Iznik Lake (Turkey)

Geochronometria

Mustafa Bozcu¹  Muhammed Z. Ozturk¹  Mustafa Avcioglu¹  Beyhan Ozturk¹  Ahmet E. Erginal¹  Erdinc Yigitbas¹  Nafiye G. Kiyak² 

[1] Canakkale Onsekiz Mart University;Işık University

关键词: Beachrock cementation;    Carbonate precipitation;    Late Holocene;    Iznik Lake;    Turkey;   

DOI  :  10.2478/s13386-011-0053-2

学科分类：社会科学、人文和艺术（综合）

来源: Politechnika Slaska * Instytut Fizyki

【 摘 要 】

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.

【 授权许可】

Unknown