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| Main Authors: | , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2003
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| Online Access: | https://doi.org/10.1594/PANGAEA.847689 |
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| _version_ | 1867170058740957184 |
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| author | Fretzdorff, Susanne Haase, Karsten M Leat, Philip Livermore, Roy A Garbe-Schönberg, Dieter Fietzke, Jan Stoffers, Peter |
| author_facet | Fretzdorff, Susanne Haase, Karsten M Leat, Philip Livermore, Roy A Garbe-Schönberg, Dieter Fietzke, Jan Stoffers, Peter |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | New U-series isotope data for lavas from the East Scotia backarc spreading center span a large range in (230Th/232Th) and (238U/232Th). Most of the backarc lavas have (238U/230Th) < 1, similar to the composition of mid-oceanic-ridge basalts (MORB). Lavas from two segments have (238U/230Th) > 1 and are enriched in fluid-mobile elements, implying a recent addition of a U-rich slab-derived component. The data from one segment suggest an influence from an aqueous fluid from altered MORB, whereas samples from the other slab-influenced segment show addition of a sediment melt. The slab-influenced samples form a distinct trend in the equiline diagram between aqueous fluid and sediment melt that is suggested to be a mixing line rather than an isochron. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_847689 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Composition of volcanic glasses from the East Scotia Ridge Fretzdorff, Susanne Haase, Karsten M Leat, Philip Livermore, Roy A Garbe-Schönberg, Dieter Fietzke, Jan Stoffers, Peter EastScotiaRidge; Error, absolute; Magnesium oxide; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; ROCK; Rock sample; Sample ID; Section; Southern Ocean; SPP1158; Thorium; Thorium-230/Thorium-232 ratio; Thorium-230/Uranium-238 ratio; Uranium; Uranium-234/Uranium-238 activity ratio; Uranium-238/Thorium-232 ratio New U-series isotope data for lavas from the East Scotia backarc spreading center span a large range in (230Th/232Th) and (238U/232Th). Most of the backarc lavas have (238U/230Th) < 1, similar to the composition of mid-oceanic-ridge basalts (MORB). Lavas from two segments have (238U/230Th) > 1 and are enriched in fluid-mobile elements, implying a recent addition of a U-rich slab-derived component. The data from one segment suggest an influence from an aqueous fluid from altered MORB, whereas samples from the other slab-influenced segment show addition of a sediment melt. The slab-influenced samples form a distinct trend in the equiline diagram between aqueous fluid and sediment melt that is suggested to be a mixing line rather than an isochron. |
| title | (Table 1) Composition of volcanic glasses from the East Scotia Ridge |
| topic | EastScotiaRidge; Error, absolute; Magnesium oxide; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; ROCK; Rock sample; Sample ID; Section; Southern Ocean; SPP1158; Thorium; Thorium-230/Thorium-232 ratio; Thorium-230/Uranium-238 ratio; Uranium; Uranium-234/Uranium-238 activity ratio; Uranium-238/Thorium-232 ratio |
| url | https://doi.org/10.1594/PANGAEA.847689 |