Pseudo dissolution of marine calcite

Publication Status is "Submitted" Or "In Press: 
Yes
LDEO Publication: 
Yes
Publication Type: 
Year of Publication: 
2003
Editor: 
Journal Title: 
Earth and Planetary Science Letters
Journal Date: 
Mar 30
Place Published: 
Tertiary Title: 
Volume: 
208
Issue: 
3-4
Pages: 
291-296
Section / Start page: 
Publisher: 
ISBN Number: 
0012-821X
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000181954800014
LDEO Publication Number: 
6409
Call Number: 
Abstract: 

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, C-13 and C-14, a strong case can be constructed that at a depth of 3.3 km 1 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; Martinet 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 info the respiration-CO2-rich core-top mixed layer and there redissolve. We term this phenomenon Pseudo dissolution. (C) 2003 Elsevier Science B.V. All rights reserved.

Notes: 

662NWTimes Cited:9Cited References Count:8

DOI: 
Doi 10.1016/S0012-821x(03)00051-7