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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Continental weathering following a Cryogenian glaciation: Evidence from calcium and magnesium isotopes
Earth and Planetary Science Letters, Volume 396, Year 2014
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Description
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. © 2014 Elsevier B.V.
Authors & Co-Authors
Kasemann, Simone A.
Germany, Bremen
Marum – Zentrum Für Marine Umweltwissenschaften
Pogge von Strandmann, Philip A.E.
United Kingdom, London
Birkbeck, University of London
Prave, Anthony R.
United Kingdom, St Andrews
University of st Andrews
Fallick, Anthony Edward
United Kingdom, East Kilbride
Scottish Universities Environmental Research Centre
Elliott, Tim
United Kingdom, Bristol
University of Bristol
Hoffmann, Karl Heinz
Namibia, Windhoek
Geological Survey of Namibia
Statistics
Citations: 84
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.1016/j.epsl.2014.03.048
ISSN:
0012821X
Research Areas
Environmental
Study Locations
Congo
Namibia