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| Titel |
Ostracod assemblages as a tool for documenting dynamics in marginal semi-closed marine environments: a case study from Late Quaternary sediments of Saronikos Gulf (Attica, central Greece) |
| VerfasserIn |
Konstantinos Daioglou, Theodora Tsourou, Hara Drinia, Assimina Antonarakou, George Anastasakis |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144417
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| Publikation (Nr.) |
 EGU/EGU2017-8240.pdf |
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| Zusammenfassung |
| The Saronikos Gulf is a semi-enclosed embayment situated in the west-central region of the
Aegean Sea in the eastern Mediterranean, and covers a total surface area of 1,117 km2. It is a
neotectonic basin, divided by a very shallow north–south-oriented platform into a western
and an eastern part. The western basin has depths exceeding 400 m, the eastern basin depths
around 100 and 200 m. Furthermore, Elefsis Bay, situated to the north, is separated from the
gulf by two shallow sills. This complex bottom morphology greatly influences the regional
water circulation pattern.
The Saronikos Gulf draws the attention of marine science because it constitutes the
natural marine gateway of the city of Athens and the Piraeus harbor and receives the treated
wastes of ∼4 million people.
A sedimentary record spanning more than 16935+50 calyr BP was recovered at N
37.52’23.38" E 23.15’40", water depth 140 m, in the western basin of the gulf. A total of 50
samples from a 260 cm core were quantitatively and qualitatively analyzed for
micropalaeontological study in order to reconstruct palaeoenvironmental conditions. In the
framework of this study, ostracod assemblages were used to trace changes in the depositional
environment of the investigated core.
Two main ostracod assemblages alternate along the core, indicating a gradual transition
from a shallow marine infralittoral to an outer infralittoral-inner -circalittoral environment. A
mesohaline shallow marine assemblage, mainly with Leptocythere lagunae, Leptocythere
rara, and Callistocythere sp., is dominant for the largest part of the core (from 260 to
about 50cm). At the upper part a deeper marine assemblage prevails, mainly with
Callistocythere crispata, Acanthocythereis hystrix, Pterygocythereis jonesii and Bairdia
sp.
The pattern of the environmental change that took place in Saronikos Gulf during Late
Quaternary is comparable with the one established by Tsourou et al. (2015) for Southern
Evoikos Gulf, suggesting that similar regional forces affected the two gulfs during the studied
period.
Tsourou, Th., Drinia, H. & G. Anastasakis (2015). Ostracod assemblages from
Holocene middle shelf deposits of southern Evoikos Gulf (central Aegean Sea, Greece)
and their palaeoenvironmental implications. Micropaleontology, 61(1-2): 85-99. |
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