(Table 1) Boron, carbon, magnesium and calcium isotope data, post-Marinoan Neoproterozoic carbonate sections, Namibia

DOI

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.

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).

Supplement to: Kasemann, Simone A; Pogge von Strandmann, Philip A E; Prave, Anthony R; Fallick, Anthony E; Elliott, Tim; Hoffmann, Karl-Heinz (2014): Continental weathering following a Cryogenian glaciation: Evidence from calcium and magnesium isotopes. Earth and Planetary Science Letters, 396, 66-77

Identifier
DOI https://doi.org/10.1594/PANGAEA.833928
Related Identifier IsSupplementTo https://doi.org/10.1016/j.epsl.2014.03.048
Related Identifier References https://doi.org/10.1016/j.epsl.2004.12.006
Related Identifier References https://doi.org/10.1130/G30851.1
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.833928
Provenance
Creator Kasemann, Simone A ORCID logo; Pogge von Strandmann, Philip A E ORCID logo; Prave, Anthony R; Fallick, Anthony E ORCID logo; Elliott, Tim ORCID logo; Hoffmann, Karl-Heinz
Publisher PANGAEA
Publication Year 2014
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 419 data points
Discipline Earth System Research
Spatial Coverage (13.996W, -20.199S, 15.016E, -19.257N); NW Namibia