Publication Date:
2023-12-15
Description:
Sm-Nd concentrations and Nd isotopes were investigated in the fine fraction of two Labrador Sea cores to reconstruct the deep circulation patterns through changes in sedimentary supply since the last glacial stage. Three sources are involved: the North American Shield, Palaeozoic rocks from northeastern Greenland, and mid-Atlantic volcanism. The variable input of these sources provides constraints on the relative sedimentary supply, in conjunction with inception of deep currents. During the last glacial stage a persistent but sluggish current occurred inside the Labrador Basin. An increasing discharge of volcanic material driven by the North East Atlantic Deep Water is documented since 14.3 kyr, signaling the setup of a modern-like deep circulation pattern throughout the Labrador, Irminger, and Iceland basins. During the last deglacial stage the isotopic record was punctually influenced by erosion processes related mainly to ice-sheet instabilities, especially 11.4, 10.2, and 9.2 kyr ago.
Keywords:
Age, 14C milieu/reservoir corrected (-400 yr); Age, dated; Age, mineral; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; HU90-13-013; HUD90/13; Hudson; Marine isotopic stage; Neodymium; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Northwest Atlantic; PC; Piston corer; Samarium; Samarium-147/Neodymium-144 ratio; ε-Neodymium
Type:
Dataset
Format:
text/tab-separated-values, 555 data points
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