Publication
U and Th isotope constraints on the duration of Heinrich events H0-H4 in the southeastern Labrador Sea
| dc.contributor.author | Veiga-Pires, C. | |
| dc.contributor.author | Hillaire-Marcel, C. | |
| dc.date.accessioned | 2012-02-23T19:44:57Z | |
| dc.date.available | 2012-02-23T19:44:57Z | |
| dc.date.issued | 1999 | |
| dc.date.updated | 2012-02-23T17:15:43Z | |
| dc.description.abstract | The duration and sequence of events recorded in Heinrich layers at sites near the Hudson Strait source area for ice-rafted material are still poorly constrained, notably because of the limit and uncertainties of the 14C chronology. Here we use high-resolution 230Th-excess measurements, in a 6 m sequence raised from Orphan Knoll (southern Labrador Sea), to constrain the duration of the deposition of the five most recent Heinrich (H) layers. On the basis of maximum/minimum estimates for the mean glacial 230Th-excess flux at the studied site a minimum/maximum duration of 1.0/0.6, 1.4/0.8, 1.3/0.8, 1.5/0.9, and 2.1/1.3 kyr is obtained for H0 (∼Younger Dryas), Hl, H2, H3, and H4, respectively. Thorium-230-excess inventories and other sedimentological features indicate a reduced but still significant lateral sedimentary supply by the Western Boundary Undercurrent during the glacial interval. U and Th series systematics also provide insights into source rocks of H layer sediments (i.e., into distal Irminger Basin/local Labrador Sea supplies). | |
| dc.identifier.citation | Paleoceanography, 14, 2, (1999) 187-187. | por |
| dc.identifier.issn | 0883-8305 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/909 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.title | U and Th isotope constraints on the duration of Heinrich events H0-H4 in the southeastern Labrador Sea | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| person.familyName | Veiga-Pires | |
| person.givenName | Cristina | |
| person.identifier | 113325 | |
| person.identifier.ciencia-id | 4A1F-CEDA-E66C | |
| person.identifier.orcid | 0000-0002-9323-0723 | |
| person.identifier.rid | B-5144-2008 | |
| person.identifier.scopus-author-id | 7801372905 | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | d1541efa-0eaa-48dc-aea3-a1e64aa0065a | |
| relation.isAuthorOfPublication.latestForDiscovery | d1541efa-0eaa-48dc-aea3-a1e64aa0065a |