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| Titel |
Multiple-proxy study of ostracods from Middle Pleistocene lake sediments at Marks Tey, Essex: Qualitative and quantitative approaches to palaeoenvironmental reconstruction |
| VerfasserIn |
Anna March, David Horne, Jonathan Holmes, Simon Lewis |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250121978
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| Publikation (Nr.) |
 EGU/EGU2016-894.pdf |
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| Zusammenfassung |
| Preliminary results of a multiple-proxy study of ostracods from the Middle Pleistocene
lacustrine sedimentary succession at Marks Tey, Essex, UK, are presented. Both
assemblage-based and isotopic analyses are used to investigate changes in the palaeoclimate
and palaeoenvironment and the associated faunal response across the transition from
interglacial to colder conditions. The >30m thick succession includes substantial intervals
represented by laminated sediments amenable to high-resolution sampling and comprises not
only the most complete record of the Hoxnian interglacial (MIS 11c) in Britain but also the
transition (MIS11b-a) to the succeeding glacial (MIS 10). A fairly diverse freshwater
(possibly slightly saline in some intervals) lacustrine ostracod fauna has so far been
recovered, including Candona spp., Ilyocypris spp., Cytherissa lacustris (Sars, 1863),
Limnocytherina sanctipatricii (Brady & Robertson, 1869),Limnocythere inopinata (Baird,
1843), Limnocythere falcata (Diebel, 1968), Limnocythere suessenbornensis (Diebel,
1968), and rare Limnocythere parallela (Diebel, 1968) (the first record from the
UK). Taphonomic analyses confirm the in situ nature of the main elements of the
assemblages, which can therefore be considered representative of local palaeoenvironments
and contemporary palaeoclimates. Changes in dominant species throughout the
succession are presented alongside results of a pilot study of stable isotopes; as yet the
extent to which these variations reflect temperature and/or evaporative enrichment
is unclear, although both may be related to climate change. Some of the higher
assemblages are comparable with those of Late Quaternary thermokarst lakes in Alaska
and Siberia. The prospects for multi-proxy quantitative analysis, combining the
Mutual Ostracod Temperature Range method with stable isotope data, are discussed. |
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