The tephra record from the Sea of Marmara for the last ca. 70 ka and its palaeoceanographic implications (Articolo in rivista)

Type
Label
  • The tephra record from the Sea of Marmara for the last ca. 70 ka and its palaeoceanographic implications (Articolo in rivista) (literal)
Anno
  • 2015-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.margeo.2015.01.005 (literal)
Alternative label
  • Cagatay, M. Namik; Wulf, Sabine; Sancar, Ummuhan; Ozmaral, Asli; Vidal, Laurence; Henry, Pierre; Appelt, Oona; Gasperini, Luca (2015)
    The tephra record from the Sea of Marmara for the last ca. 70 ka and its palaeoceanographic implications
    in Marine geology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cagatay, M. Namik; Wulf, Sabine; Sancar, Ummuhan; Ozmaral, Asli; Vidal, Laurence; Henry, Pierre; Appelt, Oona; Gasperini, Luca (literal)
Pagina inizio
  • 96 (literal)
Pagina fine
  • 110 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 361 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 15 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istanbul Teknik University; Fac Min; Helmholtz Association; Centre National de la Recherche Scientifique (CNRS); Centre National de la Recherche Scientifique (CNRS); Helmholtz Association; Consiglio Nazionale delle Ricerche (CNR) (literal)
Titolo
  • The tephra record from the Sea of Marmara for the last ca. 70 ka and its palaeoceanographic implications (literal)
Abstract
  • We report the results of tephrochronological studies on marine cores from the eastern and western part of the Sea of Marmara extending back to early MIS-4. Glass shard compositions using electron probe microanalyses (EPMA) and stratigraphic analysis assigned three distinct tephra layers to the eruption of Aydin (Somma-Vesuvius/Italy, 3.9 ka), Cape Riva (Thera/Santorini, 22 ka) and the Campanian Ignimbrite (Phlegrean Fields/Italy, 393 ka), respectively. Tephra layers are important chronostratigraphic markers for the refining of age-depth models of cores and thus for the reconstruction of the palaeoceanographic evolution of the Sea of Marmara. Accordingly, a continuous sedimentary record for the last ca. 67 ka in core MD01-2430, located at -580 m on the Western High, shows only one lacustrine-marine transition at 12.55 +/- 0.35 cal ka BP, which indicates that the Sea of Marmara was under lacustrine conditions disconnected from the Mediterranean Sea from early MIS-4 to early MIS-1. High lake levels and oxic bottom water conditions prevailed especially during the MIS-3 stadials. This implies that the sill depth of the canakkale Strait (Dardanelles) was probably higher during MIS-3 time than the present sill depth of -65 m. Alternatively, strong fresh water discharges from the Black Sea during the interstadials might have kept the Sea of Marmara stratified with a relatively thick layer of fresh waters above a weak Mediterranean inflow filling only deeper parts of the basins. Based on the radiocarbon and tephra-integrated age model the marine transgression at 12.55 +/- 0.35 cal ka BP was followed by the deposition of the main lower Holocene sapropel between ca. 12.3 and 5.7 cal ka BP, and in the shallow shelf areas (<-100 m depth) such as the Gemlik Gulf, by the formation of the upper Holocene sapropel between ca. 5.4 and 2.7 cal ka BP. (C) 2015 Elsevier B.V. All rights reserved. (literal)
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