|
|
|
|
|
| Wu, Jiawang; Filippidi, Amalia; Davies, Gareth R.; De Lange, Gert J.. |
| Organic-rich sapropel sediments were repeatedly deposited in the eastern Mediterranean Sea (EMS), in response to insolation-driven freshwater forcing. However, the exact freshwater sources and causal associated paleoclimate-related processes remain unresolved. Sapropel S5, formed during the insolation maximum of the last interglacial, is one of the most intensely developed sapropels of the Late-Quaternary. Here, detrital sediments of sapropel S5 obtained from 8 cores, together with 13 EMS surface samples, are analyzed for major elements, rare earth elements, and Sr and Nd isotopes. This permits a basin-wide investigation of the source and distribution of river-borne material to the EMS for sapropel S5, and its comparison to the present-day and the Holocene... |
| Tipo: Text |
Palavras-chave: Sapropel S5; Eastern Mediterranean Sea; Provenance; Radiogenic isotopes; Major elements; Rare earth elements. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00435/54623/56024.pdf |
| |
|
|
| Meyer, Inka; Davies, Gareth R.; Stuut, Jan-berend W.. |
| Five sediment cores from offshore NW Africa were analyzed for strontium and neodymium isotope ratios to reconstruct temporal variations in continental weathering regimes. Sediments were taken from three time slices with well-known and distinctive environmental conditions: present-day (dry and warm), similar to 6 ka (wet and warm), and similar to 12 ka (dry and cold). Terrigenous sediment samples were split into two size fractions to distinguish between the two dominant transport mechanisms offshore NW Africa: fluvial (0-10 mu m) and aeolian (10-40 mu m). Sr isotope data record evidence of marked grain size control with higher isotopic ratios in the fine fraction. In contrast, epsilon(Nd) values are largely unaffected by grain size. Minor variability in Nd... |
| Tipo: Text |
Palavras-chave: Holocene; Sr-Nd isotopes; Provenance; Grain size effect. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33870/32263.pdf |
| |
|
|
|
