First record of beachrock on Black Sea coast of Turkey: Implications for Late Holocene sea-level fluctuations

Erginal A. E., Ekinci Y. L., Demirci A., Bozcu M., Öztürk M. Z., Avcıoğlu M., ...Daha Fazla

SEDIMENTARY GEOLOGY, cilt.294, ss.294-302, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 294
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.sedgeo.2013.06.003
  • Dergi Adı: SEDIMENTARY GEOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.294-302
  • Anahtar Kelimeler: Beachrock, Sequential cementation, Sea-level changes, Thrace, Black Sea, INTERTIDAL ZONE, CEMENTATION, ISLAND, CALIBRATION, CLIMATE
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

We present new data on the diagenetic characteristics, subsurface nature and radiocarbon ages of beachrock from the Thracian Black Sea coast of Turkey, indicative of sea-level changes and climatic conditions favoring lithification of beach sands between 5.4 ka and 3.5 ka cal BP. Micrite coatings and succeeding meniscus cements typify diagenetic history and suggest a two-stage cementation over this timeframe. The early cements are typical of upper intertidal zone when the sea-level was likely similar to that of today. The ensuing intergranular bridges refer to an approximate 2 m decline in sea-level, favoring downward percolation of meteoric waters related to subaerial exposure, marked by a reduction in Mg concentration and dissolution pits on early cement coatings. Formation of beachrock during this bimillennial period could be associated with relatively drier conditions promoting the precipitation of connective cements. (C) 2013 Elsevier B.V. All rights reserved.