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Contrasting conditions preceding MIS3 and MIS2 Heinrich events

Jullien, Elsa, Grousset, Francis E., Hemming, Sidney R., Peck, Victoria Louise, Hall, Ian Robert ORCID:, Jeantet, Cédric and Billy, Isabelle 2006. Contrasting conditions preceding MIS3 and MIS2 Heinrich events. Global and Planetary Change 54 (3-4) , pp. 225-238. 10.1016/j.gloplacha.2006.06.021

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This paper presents an integrated multi-tracer study performed on piston cores recovered in the glacial ice-rafted detritus belt, stretching from Newfoundland to the Irish margin across the North Atlantic (40–55°N), in order to compare in detail the internal structure of each Heinrich event (HE). These tracers are IRD counts (quartz, dolomite, volcanic grains), their Nd isotopic composition and Ar–Ar datings of individual hornblende grains. A focus on the detailed structure of HE confirms that all intervals of massive sediment flux, specifically Heinrich layers HL1-to-5 (HLs), were dominated by North American, Laurentide ice-sheet surges from Hudson Strait, that are evident as far east as the Bay of Biscay (European margin). The sequences of events leading up to the HLs, however, present significant dissimilarities. One important difference is that HL2 and HL1 were preceded by “precursor events” (increases in the number of lithic grains per gram from non-Laurentide sediment sources). Sediment debris derived from near-simultaneous iceberg releases originating from the European ice-sheet are only detectable close to the European margin. In contrast there are no comparable precursor events before HL5 and HL4. This observation implies that precursor events are unlikely to be mechanistically linked to the triggering of HEs. The similarity of the HLs, against contrasting background conditions, is a significant observation that should add constraints to their origin.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Uncontrolled Keywords: Heinrich events; ice-rafted detritus; Nd isotopes; 40Ar/39Ar; Last glacial; North Atlantic
Publisher: Elsevier
ISSN: 0921-8181
Last Modified: 20 Oct 2022 09:04

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