Connotea
CiteULike
del.ico.us
BibSonomyAbstract
Biotic enhancement of weathering, atmospheric oxygen and carbon dioxide in the Neoproterozoic
Centre for Ecology and Hydrology, Bush Estate, Penicuik, UK
School of Environmental Sciences, University of East Anglia, Norwich, UK
It has been suggested that biological colonization of the land surface began in the Neoproterozoic 1000–544 million years ago (Ma). We hypothesize that this colonization involved selective weathering of P from rocks, as well as an amplification of overall weathering rates. We show that two recent models, despite differences in the feedback mechanisms represented, predict that an increase in the weathering flux of P to the ocean would have caused a rise in atmospheric O2 in the Neoproterozoic. This in turn may have provided a necessary condition for the evolution of animals with hard skeletons seen in the ‘Cambrian explosion’. Increased weathering of silicate rocks would also have caused a decline in atmospheric CO2, which could have been a causal factor in the Neoproterozoic glaciations.
Received 9 October 2003; accepted 10 February 2004; published 10 March 2004.
Citation: (2004), Biotic enhancement of weathering, atmospheric oxygen and carbon dioxide in the Neoproterozoic, Geophys. Res. Lett., 31, L05202, doi:10.1029/2003GL018802.
Cited By