Kasemann, Simone A; Pogge von Strandmann, Philip A E; Prave, Anthony R; Fallick, Anthony E; Elliott, Tim; Hoffmann, Karl-Heinz (2014): (Table 1) Boron, carbon, magnesium and calcium isotope data, post-Marinoan Neoproterozoic carbonate sections, Namibia [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.833928, Supplement to: Kasemann, SA et al. (2014): Continental weathering following a Cryogenian glaciation: Evidence from calcium and magnesium isotopes. Earth and Planetary Science Letters, 396, 66-77, https://doi.org/10.1016/j.epsl.2014.03.048
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Abstract:
A marked ocean acidification event and elevated atmospheric carbon dioxide concentrations following the extreme environmental conditions of the younger Cryogenian glaciation have been inferred from boron isotope measurements. Calcium and magnesium isotope analyses offer additional insights into the processes occurring during this time. Data from Neoproterozoic sections in Namibia indicate that following the end of glaciation the continental weathering flux transitioned from being of mixed carbonate and silicate character to a silicate-dominated one. Combined with the effects of primary dolomite formation in the cap dolostones, this caused the ocean to depart from a state of acidification and return to higher pH after climatic amelioration. Differences in the magnitude of stratigraphic isotopic changes across the continental margin of the southern Congo craton shelf point to local influences modifying and amplifying the global signal, which need to be considered in order to avoid overestimation of the worldwide chemical weathering flux.
Related to:
Kasemann, Simone A; Hawkesworth, Chris J; Prave, Anthony R; Fallick, Anthony E; Pearson, Paul N (2005): Boron and calcium isotope composition in Neoproterozoic carbonate rocks from Namibia: evidence for extreme environmental change. Earth and Planetary Science Letters, 231(1-2), 73-86, https://doi.org/10.1016/j.epsl.2004.12.006
Kasemann, Simone A; Prave, Anthony R; Fallick, Anthony E; Hawkesworth, Chris J; Hoffmann, Karl-Heinz (2010): Neoproterozoic ice ages, boron isotopes, and ocean acidification: Implications for a snowball Earth. Geology, 38(9), 775-778, https://doi.org/10.1130/G30851.1
Project(s):
Coverage:
Median Latitude: -19.586229 * Median Longitude: 14.336760 * South-bound Latitude: -20.199167 * West-bound Longitude: 13.995608 * North-bound Latitude: -19.256564 * East-bound Longitude: 15.016164
Minimum SECTION, height: 0.0 m * Maximum SECTION, height: 300.3 m
Event(s):
Comment:
SECTION, height [m]: heights are meters above base of cap carbonate.
#: uncertainty for Ca isotope data is ± 0.2 per mil 2 Sigma; uncertainties for Mg isotope data are valid for the last digits (2 Sigma).
+: C, O and B isotope data taken from Kasemann et al., (2005, 2010).
Ombaatjie: Ca isotope data taken from Kasemann et al., (2005).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Lithologic unit/sequence | Unit | Kasemann, Simone A | |||
| 3 | Lithology/composition/facies | Lithology | Kasemann, Simone A | |||
| 4 | Sample code/label | Sample label | Kasemann, Simone A | |||
| 5 | SECTION, height | Section | m | Geocode | ||
| 6 | δ13C, carbonate | δ13C carb | ‰ PDB | Kasemann, Simone A | + | |
| 7 | δ18O, carbonate | δ18O carb | ‰ PDB | Kasemann, Simone A | ||
| 8 | δ11B | δ11B | ‰ SRM | Kasemann, Simone A | + | |
| 9 | δ44/40 Ca | δ44/40 Ca | ‰ SRM 915a | Kasemann, Simone A | Finnigan TRITON thermal ionization mass spectrometer (TIMS) | # |
| 10 | δ26Mg | δ26Mg | ‰ | Kasemann, Simone A | # | |
| 11 | Uncertainty | Uncertainty | ± | Kasemann, Simone A | # |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
419 data points
Data
| 1 Event | 2 Unit | 3 Lithology | 4 Sample label | 5 Section [m] | 6 δ13C carb [‰ PDB] | 7 δ18O carb [‰ PDB] | 8 δ11B [‰ SRM] | 9 δ44/40 Ca [‰ SRM 915a] | 10 δ26Mg [‰] | 11 Uncertainty [±] |
|---|---|---|---|---|---|---|---|---|---|---|
| Fransfontein | Elandshoek Fm | med-bd dolostone | FF1-46 | 252.2 | 0.69 | -3.14 | -0.5 | 0.9 | ||
| Fransfontein | Elandshoek Fm | med-bd dolostone | FF1-44 | 207.2 | 2.17 | -5.17 | -2.13 | 5 | ||
| Fransfontein | Elandshoek Fm | med-bd dolostone | FF1-41 | 142.2 | 1.34 | -5.13 | 2.0 | 1.1 | ||
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-40 | 132.2 | 1.37 | -5.62 | -0.2 | 1.1 | ||
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-39 | 122.2 | 1.39 | -3.94 | 4.7 | -2.12 | 2 | |
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-37 | 102.2 | 1.61 | -4.97 | 6.7 | -1.78 | 11 | |
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-36 | 92.2 | 1.57 | -0.91 | 4.5 | 1.3 | ||
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-34 | 72.2 | 1.52 | -1.46 | 2.0 | 1.1 | ||
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-32 | 52.2 | 0.58 | -5.32 | -1.0 | 0.8 | ||
| Fransfontein | Maieberg Fm | thin-bdd dolostone | FF1-31 | 48.2 | -0.34 | -6.86 | -4.3 | 0.8 | -1.81 | 3 |
| Fransfontein | Maieberg Fm | thin-bdd limestone | FF1-30 | 42.7 | -4.19 | -9.42 | -2.5 | |||
| Fransfontein | Maieberg Fm | thin-bdd limestone | FF1-29 | 42.0 | -4.37 | -9.73 | -2.0 | 0.8 | ||
| Fransfontein | Maieberg Fm | thin-bdd limestone | FF1-28 | 14.7 | -4.13 | -10.18 | -3.6 | 1.0 | -1.69 | 10 |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-22 | 5.4 | -2.79 | -8.80 | -1.55 | 3 | ||
| Fransfontein | Keilberg Fm | dolomicrite | FF1-20 | 4.6 | -3.25 | -8.27 | -3.5 | -1.76 | 5 | |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-12 | 2.2 | -2.97 | -7.53 | -2.2 | 0.9 | -1.61 | 11 |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-9 | 1.6 | -2.25 | -7.36 | 1.0 | -1.47 | 7 | |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-6 | 1.0 | -2.60 | -7.29 | -2.6 | -1.45 | 3 | |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-5 | 0.8 | -1.74 | -6.73 | -1.2 | -1.43 | 5 | |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-4 | 0.6 | -2.17 | -7.25 | -0.5 | 1.1 | -1.63 | 12 |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-3 | 0.4 | -1.82 | -6.99 | 1.2 | 1.1 | -1.60 | 11 |
| Fransfontein | Keilberg Fm | dolomicrite | FF1-2 | 0.2 | -1.56 | -6.98 | 3.0 | 1.1 | -1.56 | 11 |
| Khowarib | Elandshoek Fm | med-bd dolostone | KW1-82 | 300.3 | -1.49 | -7.41 | 6.5 | 0.5 | ||
| Khowarib | Elandshoek Fm | med-bd dolostone | KW1-80 | 264.3 | -2.57 | -6.21 | 4.5 | 0.6 | ||
| Khowarib | Maieberg Fm | thin-bdd dolostone | KW1-79 | 260.3 | -4.09 | -8.61 | 6.5 | 0.4 | ||
| Khowarib | Maieberg Fm | thin-bdd dolostone | KW1-78 | 245.3 | -3.60 | -5.94 | 5.0 | |||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-77 | 225.3 | -3.63 | -8.10 | 6.8 | |||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-75 | 185.3 | -4.18 | -8.59 | 0.2 | |||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-67 | 80.3 | -5.19 | -9.52 | 2.5 | 0.7 | ||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-64 | 57.3 | -5.24 | -9.59 | 3.2 | 0.5 | ||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-58 | 31.3 | -5.24 | -9.05 | 0.2 | 0.5 | ||
| Khowarib | Maieberg Fm | thin-bdd limestone | KW1-55 | 21.3 | -5.13 | -8.56 | 2.2 | 0.6 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-45 | 14.8 | -4.19 | -8.96 | 0.5 | |||
| Khowarib | Keilberg Fm | dolomicrite | KW1-37 | 10.8 | -3.25 | -6.89 | -1.2 | |||
| Khowarib | Keilberg Fm | dolomicrite | KW1-32 | 8.3 | -3.03 | -7.55 | -0.1 | 0.6 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-29 | 6.8 | -2.77 | -7.47 | 2.7 | 0.3 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-24 | 4.3 | -2.98 | -7.73 | 1.5 | |||
| Khowarib | Keilberg Fm | dolomicrite | KW1-21 | 2.7 | -2.90 | -7.62 | 2.0 | 0.7 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-18 | 1.4 | -3.07 | -7.73 | 1.7 | 0.4 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-18 | 1.4 | -3.10 | -7.70 | 1.5 | 0.7 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-15 | 0.8 | 3.5 | |||||
| Khowarib | Keilberg Fm | dolomicrite | KW1-14 | 0.6 | -2.96 | -7.21 | 2.8 | 0.5 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-12 | 0.2 | -3.23 | -6.09 | 3.2 | |||
| Khowarib | Keilberg Fm | dolomicrite | KW1-11 | 0.1 | -3.17 | -7.34 | 6.7 | 0.2 | ||
| Khowarib | Keilberg Fm | dolomicrite | KW1-10 | 0.0 | -3.21 | -7.44 | 9.7 | 0.4 | ||
| Ombaatjie | Elandshoek | med-bd dolostone | OBTJ 74 | 241.0 | -1.94 | -6.13 | -0.5 | 1.1 | -1.52 | 7 |
| Ombaatjie | Maieberg Fm | thin-bdd dolostone | OBTJ 70 | 181.0 | -3.02 | -4.27 | 0.0 | 0.9 | -1.61 | 15 |
| Ombaatjie | Maieberg Fm | thin-bdd limestone | OBTJ 67 | 126.0 | -4.31 | -8.57 | 0.2 | 0.6 | -1.69 | 4 |
| Ombaatjie | Maieberg Fm | thin-bdd limestone | OBTJ 65 | 106.0 | -4.08 | -8.93 | -0.2 | 0.4 | -1.94 | 14 |
| Ombaatjie | Maieberg Fm | thin-bdd limestone | OBTJ 58 | 36.0 | -5.78 | -11.40 | -2.4 | 0.6 | -2.14 | 3 |
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 55 | 10.5 | -3.87 | -8.50 | -6.0 | 0.8 | -2.04 | 6 |
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 52 | 5.6 | -3.04 | -6.82 | -6.2 | 0.9 | -1.50 | 9 |
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 47 | 2.5 | -3.01 | -6.87 | -4.8 | 1.0 | -1.43 | 13 |
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 46 | 1.6 | -2.56 | -6.90 | -5.5 | 1.0 | ||
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 45 | 1.5 | -2.63 | -6.30 | -3.3 | 1.0 | -1.39 | 11 |
| Ombaatjie | Keilberg Fm | dolomicrite | OBTJ 43 | 0.1 | 1.66 | -4.60 | 2.7 | 1.1 | -1.78 | 7 |