Fretzdorff, Susanne; Haase, Karsten M; Leat, Philip; Livermore, Roy A; Garbe-Schönberg, Dieter; Fietzke, Jan; Stoffers, Peter (2003): (Table 1) Composition of volcanic glasses from the East Scotia Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.847689, Supplement to: Fretzdorff, S et al. (2003): 230Th-238U disequilibrium in East Scotia backarc basalts: Implications for slab contributions. Geology, 31(8), 693, https://doi.org/10.1130/G19469.1
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Abstract:
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.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -58.000000 * Longitude: -25.000000
Event(s):
Comment:
The quoted errors are 2 sigma errors.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Section | Sect | Fretzdorff, Susanne | segment | ||
| 2 | Sample ID | Sample ID | Fretzdorff, Susanne | |||
| 3 | Magnesium oxide | MgO | % | Fretzdorff, Susanne | ||
| 4 | Thorium | Th | mg/kg | Fretzdorff, Susanne | ||
| 5 | Uranium | U | mg/kg | Fretzdorff, Susanne | ||
| 6 | Uranium-238/Thorium-232 ratio | 238U/232Th | Fretzdorff, Susanne | |||
| 7 | Error, absolute | Error a | ± | Fretzdorff, Susanne | 238U/232Th | |
| 8 | Uranium-234/Uranium-238 activity ratio | (234U/238U) | Fretzdorff, Susanne | |||
| 9 | Error, absolute | Error a | ± | Fretzdorff, Susanne | 234U/238U | |
| 10 | Thorium-230/Thorium-232 ratio | 230Th/232Th | Fretzdorff, Susanne | |||
| 11 | Error, absolute | Error a | ± | Fretzdorff, Susanne | 230Th/232Th | |
| 12 | Thorium-230/Uranium-238 ratio | 230Th/238U | Fretzdorff, Susanne | |||
| 13 | Error, absolute | Error a | ± | Fretzdorff, Susanne | 230Th/238U |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
265 data points
Data
| 1 Sect (segment) | 2 Sample ID | 3 MgO [%] | 4 Th [mg/kg] | 5 U [mg/kg] | 6 238U/232Th | 7 Error a [±] (238U/232Th) | 8 (234U/238U) | 9 Error a [±] (234U/238U) | 10 230Th/232Th | 11 Error a [±] (230Th/232Th) | 12 230Th/238U | 13 Error a [±] (230Th/238U) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| E3 | 96DS-1 | 8.16 | 0.178 | 0.0590 | 1.006 | 0.004 | 1.164 | 0.020 | 1.158 | 0.015 | ||
| E3 | 97DS-1 | 6.94 | 0.323 | 0.1000 | 0.944 | 0.004 | 1.046 | 0.016 | 1.108 | 0.014 | ||
| E3 | 98DS-1 | 6.83 | 0.499 | 0.1420 | 0.864 | 0.004 | 0.953 | 0.011 | 1.103 | 0.011 | ||
| E4 | wx47 | 6.35 | 0.666 | 0.1900 | 0.865 | 0.005 | 1.000 | 0.006 | 0.841 | 0.011 | 0.972 | 0.014 |
| E4 | 99DS-1 | 5.85 | 1.372 | 0.3260 | 0.720 | 0.004 | 1.013 | 0.005 | 0.738 | 0.007 | 1.025 | 0.011 |
| E4 | 99DS-4 | 5.97 | 1.408 | 0.3300 | 0.711 | 0.004 | 0.760 | 0.006 | 1.069 | 0.009 | ||
| E4 | 100DS-1 | 7.42 | 0.263 | 0.0910 | 1.057 | 0.003 | 0.999 | 0.005 | 1.001 | 0.011 | 0.947 | 0.012 |
| E5 | wx48 | 8.13 | 0.103 | 0.0444 | 1.308 | 0.004 | 1.469 | 0.020 | 1.123 | 0.012 | ||
| E5 | 104DS-1 | 7.02 | 0.225 | 0.0891 | 1.200 | 0.006 | 1.203 | 0.019 | 1.003 | 0.016 | ||
| E5 | 104DS-1 (rpt) | 7.02 | 0.225 | 0.0879 | 1.192 | 0.003 | 1.203 | 0.019 | 1.003 | 0.017 | ||
| E6 | 106DS-1 | 7.82 | 0.128 | 0.0499 | 1.182 | 0.005 | 1.203 | 0.028 | 1.018 | 0.023 | ||
| E6 | 107DS-1 | 7.93 | 0.152 | 0.0630 | 1.257 | 0.004 | 1.314 | 0.022 | 1.045 | 0.016 | ||
| E6 | 107DS-3 | 8.10 | 0.200 | 0.0713 | 1.079 | 0.003 | 1.166 | 0.014 | 1.081 | 0.011 | ||
| E6 | 108DS-1 | 7.68 | 0.217 | 0.0805 | 1.126 | 0.003 | 1.164 | 0.017 | 1.033 | 0.014 | ||
| E7 | 109DS-1 | 7.75 | 0.128 | 0.0498 | 1.183 | 0.004 | 1.214 | 0.021 | 1.026 | 0.017 | ||
| E7 | 110DS-3 | 6.81 | 0.309 | 0.1130 | 1.108 | 0.003 | 1.214 | 0.012 | 1.096 | 0.009 | ||
| E8 | wx56 | 5.04 | 0.216 | 0.0826 | 1.160 | 0.005 | 0.996 | 0.012 | 1.007 | 0.016 | 0.868 | 0.019 |
| E8 | wx60 | 3.58 | 0.178 | 0.0608 | 1.035 | 0.005 | 0.995 | 0.011 | 0.885 | 0.020 | 0.855 | 0.027 |
| E8 | wx62 | 6.65 | 0.120 | 0.0383 | 0.970 | 0.003 | 0.993 | 0.014 | 0.900 | 0.023 | 0.928 | 0.028 |
| E9 | wx63 | 6.20 | 0.298 | 0.1040 | 1.060 | 0.004 | 1.159 | 0.015 | 1.093 | 0.013 | ||
| E9 | wx67 | 6.61 | 0.614 | 0.2160 | 1.069 | 0.006 | 1.124 | 0.013 | 1.051 | 0.012 | ||
| E9 | wx68 | 6.66 | 0.382 | 0.1320 | 1.047 | 0.005 | 1.230 | 0.010 | 1.175 | 0.008 | ||
| E9 | wx69 | 7.22 | 0.447 | 0.1580 | 1.076 | 0.005 | 1.159 | 0.008 | 1.078 | 0.008 |