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


ERGİNAL A. E. , Kiyak N. G. , ÖZTÜRK M. , Yiğitbaş E. , Bozcu M. , Avcıoğlu M. , ...Daha Fazla

GEOCHRONOMETRIA, cilt.39, ss.76-83, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 39 Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.2478/s13386-011-0053-2
  • Dergi Adı: GEOCHRONOMETRIA
  • Sayfa Sayıları: ss.76-83

Özet

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.