Evolution of the sebkha Dreîaa (South-Eastern Tunisia, Gulf of Gabes) during the Late Holocene: Response of ostracod assemblages

Zaïbi, Chahira; Carbonel, Pierre; Kamoun, Fékri; Fontugne, Michel; Azri, Chafai; Jedoui, Younes; Montacer, Mabrouk

doi:10.1016/j.revmic.2012.03.003

Cited by 20 publications

(11 citation statements)

References 30 publications

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“…Similar observations are described in the modern Rhône subaqueous delta (Goineau et al, 2011(Goineau et al, , 2015Mojtahid et al, 2009). Similarly, ostracods content of Cluster A are represented by littoral to sublittoral/phytal marine forms (e.g., Bonaduce et al, 1975;Cabral et al, 2006;Carbonel, 1980;Peypouquet and Nachite, 1984;Zaïbi et al, 2012). The genus Leptocythere is commonly found in brackish and shallow-water environments, and many Leptocythere are known to be euryhaline species (e.g., Anadon et al, 2002;Boomer and Eisenhauer, 2002;Carbonel, 1973Carbonel, , 1980Frenzel and Boomer, 2005;Gliozzi et al, 2005;Van Morkhoven, 1963).…”

Section: Record Of Holocene Sea-level Rise and Rhône Delta Evolutionsupporting

confidence: 67%

“…Except for C. lobatulus, which is preferentially found in a high-energy shallowwater setting (e.g., Bartels-Jónsdóttir et al, 2006;Javaux and Scott, 2003;Milker et al, 2011;Murray, 2006), foraminifera assemblage is mainly composed of species thriving under a stable environment characterized by marine-derived organic matter input and well-oxygenated sediments (e.g., De Rijk et al, 2000;Debenay and Redois, 1997;Fontanier et al, 2008;Goineau, 2011;Goineau et al, 2011Goineau et al, , 2015Mendes et al, 2004;Mojtahid et al, 2009). Clusters B and F are mainly composed of shallow infra-littoral ostracods (e.g., Bonaduce et al, 1975;Frenzel and Boomer, 2005;Guernet et al, 2003;Ruiz et al, 1997;Zaïbi et al, 2012), whereas Cluster C is primarily made of circa-littoral and epi-bathyal species (e.g., Bonaduce et al, 1975;El Hmaidi et al, 2010;Yamaguchi and Norris, 2012).…”

Section: Record Of Holocene Sea-level Rise and Rhône Delta Evolutionmentioning

confidence: 99%

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Sedimentary archives of climate and sea-level changes during the Holocene in the Rhone prodelta (NW Mediterranean Sea)

Fanget¹,

Bassetti²,

Fontanier³

et al. 2016

Preprint

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Abstract. A 7.38 m-long sediment core was collected from the eastern part of the Rhone prodelta (NW Mediterranean) at 67 m water depth. A multi-proxy study (sedimentary facies, benthic foraminifera and ostracods, clay mineralogy, and major elements from XRF) provides a multi-decadal to century-scale record of climate and sea-level changes during the Holocene. The early Holocene is marked by alternative silt and clay layers interpreted as distal tempestites deposited in a context of rising sea level. This interval contains shallow infra-littoral benthic meiofauna (e.g. Pontocythere elongata, Elphidium spp., Quinqueloculina lata) and formed between ca. 20 and 50 m water depth. The middle Holocene (ca. 8.3 to 4.5 ka cal. BP), is characterized, at the core site, by a period of sediment starvation (accumulation rate of ca. 0.01 cm yr−1) resulting from the maximum landward shift of the shoreline and the Rhone outlet(s). From a sequence stratigraphic point of view, this condensed interval, about 35 cm-thick, is a Maximum Flooding Surface that can be identified on seismic profiles as the transition between delta retrogradation and delta progradation. It is marked by very distinct changes in all proxy records. Following the stabilization of the global sea level, the late Holocene is marked by the establishment of prodeltaic conditions at the core site, as shown by the lithofacies and by the presence of benthic meiofauna typical of the modern Rhone prodelta (e.g. Valvulineria bradyana, Cassidulina carinata, Bulimina marginata). Several periods of increased fluvial discharge are also emphasized by the presence of species commonly found in brackish and shallow water environments (e.g. Leptocythere). Some of these periods correspond to the multi-decadal to centennial late Holocene humid periods recognized in Europe (i.e. the 2.8 ka event and the Little Ice Age). Two other periods of increased runoffs at ca. 1.3 and 1.1 ka cal. BP are recognized, and are likely to reflect periods of regional climate deterioration that are observed in the Rhone watershed.

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Section: Record Of Holocene Sea-level Rise and Rhône Delta Evolutionsupporting

confidence: 67%

Section: Record Of Holocene Sea-level Rise and Rhône Delta Evolutionmentioning

confidence: 99%

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhone prodelta (NW Mediterranean Sea)

Fanget¹,

Bassetti²,

Fontanier³

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

“…Similar observations are described in the modern Rhône subaqueous delta (Goineau et al, , 2015Mojtahid et al, 2009). Similarly, ostracods content of Cluster A are represented by littoral to sublittoral/phytal marine forms (e.g., Bonaduce et al, 1975;Cabral et al, 2006;Carbonel, 1980;Peypouquet and Nachite, 1984;Zaïbi et al, 2012). The genus Leptocythere is commonly found in brackish and shallow-water environments, and many Leptocythere are known to be euryhaline species (e.g., Anadon et al, 2002;Boomer and Eisenhauer, 2002;Carbonel, 1973Carbonel, , 1980Frenzel and Boomer, 2005;Gliozzi et al, 2005;Van Morkhoven, 1963).…”

Section: Interval 1 (Ca 105-83 Ka Cal Bp)supporting

confidence: 65%

Section: Interval 2 (Ca 83-45 Ka Cal Bp)mentioning

confidence: 99%

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhône prodelta (NW Mediterranean Sea)

et al. 2016

View full text Add to dashboard Cite

Abstract. A 7.38 m long sediment core was collected from the eastern section of the Rhône prodelta (NW Mediterranean) at 67 m water depth. A multi-proxy study (including sedimentary facies, benthic foraminifera, ostracods, and clay mineralogy) provides a multi-decadal to century-scale record of climate and sea-level changes during the Holocene. The early Holocene is marked by alternative silt and clay layers interpreted as distal tempestites deposited in a context of rising sea level. This interval contains shallow infra-littoral benthic meiofauna (e.g., Pontocythere elongata, Elphidium spp., Quinqueloculina lata) and formed between ca. 20 and 50 m water depth. The middle Holocene (ca. 8.3 to 4.5 ka cal. BP) is characterized, at the core site, by a period of sediment starvation (accumulation rate of ca. 0.01 cm yr −1 ) resulting from the maximum landward shift of the shoreline and the Rhône outlet(s). From a sequence stratigraphic point of view, this condensed section, about 35 cm thick, can be identified on seismic profiles as a maximum flooding surface that marks the transition between delta retrogradation and delta progradation. The transition between the early Holocene deposits and the middle Holocene condensed section is marked by a gradual change in all proxy records. Following the stabilization of sea level at a global scale, the late Holocene is marked by the establishment of prodeltaic conditions at the core site, as shown by the lithofacies and by the presence of benthic meiofauna typical of the modern Rhône prodelta (e.g., Valvulineria bradyana, Cassidulina carinata, Bulimina marginata). Several periods of increased fluvial discharge are also emphasized by the presence of species commonly found in brackish and shallow-water environments (e.g., Leptocythere spp.

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“…Cerastoderma glaucum and Abra segmentum are also present in fair numbers. Two inner shelf taxa, Elphidium and Bulimina, as well as the marine lagoonal and brackish taxon Loxoconha elliptica (Zaibi et al 2012), were also identified. The assemblage at 25 cm depth is almost the same, with the exception that H. acuta , L. elliptica and A .…”

Section: Resultsmentioning

confidence: 99%

Depositional environments, sediment characteristics, palaeoecological analysis and environmental assessment of an internationally protected shallow Mediterranean lagoon, Gialova Lagoon – Navarino Bay, Greece

Avramidis¹,

Iliopoulos²,

Κοντόπουλος³

et al. 2014

Earth and Environmental Science Transactions of the Royal Socie

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This study presents sedimentological, palaeoecological and geochemical data from a shallow Mediterranean coastal lagoon which has been severely influenced by human intervention over the last 70 years. The Gialova Lagoon is protected by international conventions and is listed in the Natura 2000 European Community Network as Special Protection Area (SPA) and Site of Community Importance (SCI). The spatial variability of sediment characteristics such as grain size, total organic carbon (TOC) and moment measures, mean, sorting, kurtosis and skewness were calculated. Moreover, micro- and macrofossil and sediment geochemical analyses were carried out on six gravity core samples. Study of the above parameters indicates that the anthropogenic impact and intervention are reflected in the micro- (ostracods, foraminifera, charophytes) and macrofossil (molluscs) taxa corresponding to different depositional environmental facies, representing a brackish lagoon with the influence of (a) fresh water inflow, (b) shallow marine environment and (c) hypoxic and dystrophic conditions. The geochemical characteristics and the calculation of the degree of sediment contamination using enrichment factors (EF), contamination factors (Cif) and the index of geo-accumulation (Igeo) indicate a recent relative improvement of the lagoon towards the upper layers of the gravity cores, rendering the lagoon as unpolluted to moderately polluted. This combinatorial study of sediment geochemical characteristics, as well as the downcore micro- and macrofossil assemblages, can be considered as a baseline for future monitoring in accordance with European Union directives, and for any future engineering interventions for the lagoon environmental maintenance and conservation; as this is the first time that geochemical and downcore palaeoecological data have been presented from this lagoon.

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Evolution of the sebkha Dreîaa (South-Eastern Tunisia, Gulf of Gabes) during the Late Holocene: Response of ostracod assemblages

Cited by 20 publications

References 30 publications

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhone prodelta (NW Mediterranean Sea)

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhone prodelta (NW Mediterranean Sea)

Sedimentary archives of climate and sea-level changes during the Holocene in the Rhône prodelta (NW Mediterranean Sea)

Depositional environments, sediment characteristics, palaeoecological analysis and environmental assessment of an internationally protected shallow Mediterranean lagoon, Gialova Lagoon – Navarino Bay, Greece

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