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Fretzdorff, Susanne; Haase, Karsten M; Leat, Philip; Livermore, Roy A; Garbe-Schönberg, Carl-Dieter; Fietzke, Jan; Stoffers, Peter (2003): (Table 1) Composition of volcanic glasses from the East Scotia Ridge. PANGAEA,, Supplement to: Fretzdorff, S et al. (2003): 230Th-238U disequilibrium in East Scotia backarc basalts: Implications for slab contributions. Geology, 31(8), 693,

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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.
Latitude: -58.000000 * Longitude: -25.000000
EastScotiaRidge * Latitude: -58.000000 * Longitude: -25.000000 * Location: Southern Ocean * Method/Device: Rock sample (ROCK)
The quoted errors are 2 sigma errors.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SectionSectFretzdorff, Susannesegment
2Sample IDSample IDFretzdorff, Susanne
3Magnesium oxideMgO%Fretzdorff, Susanne
4ThoriumThmg/kgFretzdorff, Susanne
5UraniumUmg/kgFretzdorff, Susanne
6Uranium 238/Thorium 232 ratio238U/232ThFretzdorff, Susanne
7Error, absoluteError a±Fretzdorff, Susanne238U/232Th
8Uranium 234/Uranium 238 activity ratio(234U/238U)Fretzdorff, Susanne
9Error, absoluteError a±Fretzdorff, Susanne234U/238U
10Thorium 230/Thorium 232 ratio230Th/232ThFretzdorff, Susanne
11Error, absoluteError a±Fretzdorff, Susanne230Th/232Th
12Thorium 230/Uranium 238 ratio230Th/238UFretzdorff, Susanne
13Error, absoluteError a±Fretzdorff, Susanne230Th/238U
265 data points

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