Last glacial-Holocene sediment sequences in N. Aegean basins: Structure, accumulation rates and clay mineral distribution

Roussakis, G; Karageorgis, AP; Conispoliatis, N; Lykousis, V

dc.contributor.author	Roussakis, G	en
dc.contributor.author	Karageorgis, AP	en
dc.contributor.author	Conispoliatis, N	en
dc.contributor.author	Lykousis, V	en
dc.date.accessioned	2014-03-01T01:20:42Z
dc.date.available	2014-03-01T01:20:42Z
dc.date.issued	2004	en
dc.identifier.issn	0276-0460	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16019
dc.subject	Clay Minerals	en
dc.subject	Grain Size	en
dc.subject	Organic Carbon	en
dc.subject	Relative Sea Level	en
dc.subject	Seasonality	en
dc.subject	Sediment Supply	en
dc.subject	Sedimentation Rate	en
dc.subject	Vertical Distribution	en
dc.subject	Eastern Mediterranean	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Oceanography	en
dc.subject.other	basin fill	en
dc.subject.other	grain size	en
dc.subject.other	Holocene	en
dc.subject.other	Last Glacial	en
dc.subject.other	sedimentary sequence	en
dc.subject.other	sedimentation	en
dc.subject.other	Aegean Sea	en
dc.subject.other	Mediterranean Sea	en
dc.title	Last glacial-Holocene sediment sequences in N. Aegean basins: Structure, accumulation rates and clay mineral distribution	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s00367-004-0167-0	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s00367-004-0167-0	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The vertical distribution patterns of grain-size parameters, carbonate and organic carbon contents, and clay mineral abundances were examined in ten sediment cores from basins of the northern Aegean Sea. Sedimentation rates for Holocene deposition were determined on the basis of 11 14C datings and indirectly from the age of the lower sapropel S1; they were estimated at 14.9, 18.9-21.8 and 34.7 cm 103 year-1 for the North Skyros, Athos, and North Limnos basins respectively. The sedimentation rates decrease gradually towards the southern basins, as a consequence of the greater distance from sediment supply sources. Also, sedimentation rates appear to decrease from the last glacial to Holocene units. The clay minerals illite, smectite, kaolinite and chlorite were identified in the cores. Generally, illite is the predominant mineral, showing a north-south-decreasing trend, followed by smectite; both minerals have a terrigenous origin, and smectite occurrence is higher in basins located near Limnos Island where volcanic formations prevail. Terrigenous illite is abundant in the sapropel S1, exhibiting the highest content of all sedimentological units. High illite content is unusual in eastern Mediterranean sapropels. This pattern is attributed to the proximity of the N. Aegean Sea basins to Balkan and Turkish land sources. In general, sediment mass gravity flow processes coupled with seasonal deposition from nepheloid layers are the predominant sedimentation mechanisms in the N. Aegean basins. The relative sea-level stand, the proximity to terrigenous sources (rivers), the morphology of the N. Aegean basins (small dimensions, isolated, steep slopes), as well as seismic activity and strong bottom currents are probably the major factors controlling sedimentation in the region. © Springer-Verlag 2004.	en
heal.publisher	SPRINGER-VERLAG	en
heal.journalName	Geo-Marine Letters	en
dc.identifier.doi	10.1007/s00367-004-0167-0	en
dc.identifier.isi	ISI:000221115400004	en
dc.identifier.volume	24	en
dc.identifier.issue	2	en
dc.identifier.spage	97	en
dc.identifier.epage	111	en