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A Method for Quantifying Deep-Sea Carbonate Dissolution Using 14C Dating

Published online by Cambridge University Press:  18 July 2016

S.A. Van Kreveld ,
G. M. Ganssen ,
J.E. Van Hinte ,
M. M. Melkert ,
S. R. Troelstra ,
K. Van Der Borg  and
A. De Jong
S.A. Van Kreveld
Affiliation:
Center for Marine Earth Sciences, Free University, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands
G. M. Ganssen
Affiliation:
Center for Marine Earth Sciences, Free University, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands
J.E. Van Hinte
Affiliation:
Center for Marine Earth Sciences, Free University, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands
M. M. Melkert
Affiliation:
Center for Marine Earth Sciences, Free University, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands
S. R. Troelstra
Affiliation:
Center for Marine Earth Sciences, Free University, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands
K. Van Der Borg
Affiliation:
Robert J. van de Graaff Laboratorium, State University Utrecht, Box 80.000, NL-3508 TA Utrecht, The Netherlands
A. De Jong
Affiliation:
Robert J. van de Graaff Laboratorium, State University Utrecht, Box 80.000, NL-3508 TA Utrecht, The Netherlands
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Abstract

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We quantified the rate of carbonate dissolution with increasing water depth by taking the difference in the carbonate mass accumulation rate of deep (3393–4375 m) core top sediments from the shallowest one (3208 m), which we assumed was unaffected by dissolution. This method depends on high quality 14C dates that we calibrated to calendar years for calculating sedimentation rates. Our results show low (ranging from 0 to 0.3 g cm−2 ka−1) and high (ranging from 1.5 to 1.7 g cm−2 ka−1) carbonate dissolution rates, above and below 4000 m, respectively. Therefore, we interpret the sudden increase in the carbonate dissolution rate at 4000-m water depth to mark the lysocline.

Type
IV. 14C as a Tracer of the Dynamic Carbon Cycle in the Current Environment
Information
Radiocarbon , Volume 37 , Issue 2 , 1995 , pp. 585 - 592
Copyright
Copyright © the Department of Geosciences, The University of Arizona 

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