Silicic tephras in ODP Legs 151, 152, and 162
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2002
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| _version_ | 1867167661382696960 |
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| author | Lacasse, Christian van den Bogaard, Paul |
| author_facet | Lacasse, Christian van den Bogaard, Paul |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A 6-m.y.-long composite marine record of explosive silicic volcanism from five Ocean Drilling Program sites in the subpolar North Atlantic was compared with several marine records of global and local paleoclimate proxies (benthic d18O and ice-rafted debris records). Coarsening and high frequency of occurrence of Icelandic tephras were recorded in 3.6-3 Ma sediments, suggesting that these tephras were dispersed farther from the source by enhanced westerly winds over the subpolar North Atlantic. The 40Ar/39Ar ages were determined by laser probe on K-feldspar and biotite phenocrysts of tephras that were erupted from the Jan Mayen volcanic system. Compared to the tuned paleomagnetic age model, the 40Ar/39Ar dating (0.618+/-0.007 Ma to 4.90+/-0.05 Ma) yields a new age model that postdates by 155 k.y. the inception of ice rafting on the Iceland Plateau during the cold marine isotope stage M2 (i.e., 3.3-3.14 Ma). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_713309 |
| institution | PANGAEA |
| language | en |
| publishDate | 2002 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Silicic tephras in ODP Legs 151, 152, and 162 Lacasse, Christian van den Bogaard, Paul 151-907A; 152-919A; 152-919B; 162-907B; 162-983A; 162-983C; 162-984B; 162-985A; 162-985B; DRILL; Drilling/drill rig; Greenland Sea; Iceland Sea; Joides Resolution; Leg151; Leg152; Leg162; North Atlantic Ocean; Norwegian Sea; Ocean Drilling Program; ODP A 6-m.y.-long composite marine record of explosive silicic volcanism from five Ocean Drilling Program sites in the subpolar North Atlantic was compared with several marine records of global and local paleoclimate proxies (benthic d18O and ice-rafted debris records). Coarsening and high frequency of occurrence of Icelandic tephras were recorded in 3.6-3 Ma sediments, suggesting that these tephras were dispersed farther from the source by enhanced westerly winds over the subpolar North Atlantic. The 40Ar/39Ar ages were determined by laser probe on K-feldspar and biotite phenocrysts of tephras that were erupted from the Jan Mayen volcanic system. Compared to the tuned paleomagnetic age model, the 40Ar/39Ar dating (0.618+/-0.007 Ma to 4.90+/-0.05 Ma) yields a new age model that postdates by 155 k.y. the inception of ice rafting on the Iceland Plateau during the cold marine isotope stage M2 (i.e., 3.3-3.14 Ma). |
| title | Silicic tephras in ODP Legs 151, 152, and 162 |
| topic | 151-907A; 152-919A; 152-919B; 162-907B; 162-983A; 162-983C; 162-984B; 162-985A; 162-985B; DRILL; Drilling/drill rig; Greenland Sea; Iceland Sea; Joides Resolution; Leg151; Leg152; Leg162; North Atlantic Ocean; Norwegian Sea; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.713309 |