Radiogenic Nd isotope labeling of the northern NE Atlantic during MIS 2

摘要: Paleoceanographic reconstructions rely on chemical proxies which are controlled by physical, chemical, and biological marine parameters. The accurate interpretation of proxy records relies the integrity proxy-environmental relationships through time, under changing conditions. In this study we closely examine paleo controls authigenic Nd isotope from five cores in northern NE Atlantic, approximating a depth-transect, allowing spatial temporal to be reconstructed. We compare our with other paleocirculation proxies, consider sedimentalogical signals, comparing ice-rafted detritus lithology counts, detrital sediment chemistry redox sensitive element concentrations measured foraminifera coatings. With suite geochemical data show that Atlantic were labeled radiogenic sediments, however modification did not occur pore-waters each core, but instead likely reflects changes isotopic composition deep-waters caused input during Heinrich events last glacial maximum. This has implications for understanding how localized signal can set watermass end-member composition, decoupling proxy-circulation locally, providing potentially traced along deep-water flowpath. Such scenarios must considered future interpretations taken within belt downstream flowpaths.