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., ...More

GEOCHRONOMETRIA, vol.39, no.1, pp.76-83, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 1
  • Publication Date: 2012
  • Doi Number: 10.2478/s13386-011-0053-2
  • Journal Name: GEOCHRONOMETRIA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.76-83
  • Çanakkale Onsekiz Mart University Affiliated: Yes

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.