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

Roberts, Natalie L. and Piotrowski, Alexander M. (2015) Radiogenic Nd isotope labeling of the northern NE Atlantic during MIS 2. Earth and Planetary Science Letters, 423. pp. 125-133. ISSN 0012821X DOI

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

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA69;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Earth and Planetary Science Letters
Volume: 423
Page Range: pp. 125-133
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 20 Aug 2015 14:28
Last Modified: 25 Aug 2015 14:57

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