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| Hesse, Reinhard; Khodabakhsh, Saeed. |
| Heinrich layers (H-layers) are distinct, decimetre to centimetre thick layers of ice-rafted debris (IRD) that were deposited in the North Atlantic during the Late and middle Pleistocene. H-layers (H-layers) are characterized by high detrital carbonate and low foraminifera contents. In the Labrador Sea, H-layers reach metre thickness in some proximal core sites near the iceberg source of the Hudson Strait ice stream and show five distinct depositional facies involving sediment lofting and low-density turbidity currents as sediment delivery processes besides ice rafting. Thick massive ice-rafted layers (type I H-layers) occur in the most proximal parts of H-layer 3 and older H-layers. Within 300 km distance from the assumed Hudson Strait ice stream terminus,... |
| Tipo: Text |
Palavras-chave: Heinrich layers; Labrador Sea; Ice rafting; Sediment lofting; Turbidity currents; Ice-proximal environments. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00341/45214/44639.pdf |
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| Hemming, Sidney R.. |
| Millennial climate oscillations of the glacial interval are interrupted by extreme events, the so-called Heinrich events of the North Atlantic. Their near-global footprint is a testament to coherent interactions among Earth's atmosphere, oceans, and cryosphere on millennial timescales. Heinrich detritus appears to have been derived from the region around Hudson Strait. It was deposited over approximately 500 +/- 250 years. Several mechanisms have been proposed for the origin of the layers: binge-purge cycle of the Laurentide ice sheet, jokulhlaup activity from a Hudson Bay lake, and an ice shelf buildup/collapse fed by Hudson Strait. To determine the origin of the Heinrich events, I recommend (1) further studies of the timing and duration of the events,... |
| Tipo: Text |
Palavras-chave: Climate; Heinrich layers; Heinrich events; Ice-rafted detritus. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00224/33549/32033.pdf |
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