Unknown
PANGAEA
In:
Supplement to: Fretzdorff, Susanne; Haase, Karsten M; Leat, Philip; Livermore, Roy A; Garbe-Schönberg, Dieter; Fietzke, Jan; Stoffers, Peter (2003): 230Th-238U disequilibrium in East Scotia backarc basalts: Implications for slab contributions. Geology, 31(8), 693, https://doi.org/10.1130/G19469.1
Publication Date:
2023-10-28
Description:
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.
Keywords:
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
Type:
Dataset
Format:
text/tab-separated-values, 265 data points
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