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| Traoré, Kalil; Menier, David; Gensac, Erwan; Le Roy, Pascal; Lambert, Clément; Bessin, Paul; Pédoja, Kevin; Duperret, Anne; Le Gall, Romain. |
| The morphology and internal structure of the Horaine Bank (Bay of Saint-Brieuc, NW France) are described based on multibeam echosounder and high-resolution seismic datasets coupled with vibro-core data. The Horaine Bank shows large-scale bedforms in the lee of a submerged rocky shoal, which allowed defining it as a Banner Bank. The internal structure of the sandbank reveals four seismic units (U1–U4) on a Cambrian basement (U0). The basal unit U1 is interpreted as reworked lowstand fluvial sediments those infilled micro incised valleys during a rise in sea level. This unit is overlain by paleo-coastal barrier sand-spit (U2) whose development was controlled by swell in the context of a rapid rise in sea level. The successive prograding unit (U3) is... |
| Tipo: Text |
Palavras-chave: Sand banks; Banner bank; Holocene climate; Geomorphology; Sea level rise; Tidal gyre.. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00685/79660/82424.pdf |
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| Roth, S; Reijmer, Jjg. |
| A marine sediment core from the leeward margin of Great Bahama Bank (GBB) was subjected to a multiproxy study. The aragonite dominated core MD992201 comprises the past 7230 years in a decadal time resolution and shows sedimentation rates of up to 13.8 m/kyr. Aragonite mass accumulation rates, age differences between planktonic foraminifera and aragonite sediments, and temperature distribution are used to deduce changes in aragonite production rates and paleocurrent strengths. Aragonite precipitation rates on GBB are controlled by exchange of carbonate ions and CO2 loss due to temperature-salinity conditions and biological activity, and these are dependent on the current strength. Paleocurrent strengths on GBB show high current velocities during the periods... |
| Tipo: Text |
Palavras-chave: Holocene climate; Great Bahama Bank; Atlantic circulation. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00229/33981/32331.pdf |
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