Pseudo dissolution of marine calcite

Details Pseudo dissolution of marine calcite Pseudo dissolution of marine calcite

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.208..291b&link_type=abstract

Earth and Planetary Science Letters, Volume 208, Issue 3-4, p. 291-296.

Physics

3

Caco3 Dissolution

Scientific paper

An enigma exists regarding observations aimed at determining the extent of calcite dissolution on the Ceara Rise in the western equatorial Atlantic. Based on pore-water gradients for Ca, alkalinity, pH, 13C and 14C, a strong case can be constructed that at a depth of 3.3 km about 30% of the calcite rain dissolves [Martin and Sayles, Geochim. Cosmochim. Acta 60 (1996) 243-263 Hales and Emerson, Geochim. Cosmochim. Acta 61 (1997) 501-514 Martin et al., Geochim. Cosmochim. Acta 61 (2000) 1391-1404]. However, benthic chambers deployed at this site record no Ca or alkalinity flux [Jahnke and Jahnke, Geochim. Cosmochim. Acta (2002) in press]. Further, there is no evidence for shell weight loss or shell breakup between 2.8 and 4.1 km water depth on the Ceara Rise [Broecker and Clark, Global Geochem. Cycles (2002) in press]. A possible scenario which accounts for all but the 14C observations [Martin et al., Geochim. Cosmochim. Acta 61 (2000) 1391-1404] is that coatings formed on the calcite are stirred downward into the respiration-CO2-rich core-top mixed layer and there redissolve. We term this phenomenon pseudo dissolution.

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