PDF

Deep-sea limestone block as a source of14C-depleted dissolved inorganic carbon at the Palau Trench

Tatsuya Tsuboi, Hideki Wada

2013enpalau trenchdeep-sealimestonedissolutioncarbon isotopes

Abstract

Language:

The submersible Shinkai 6500 located a large limestone block on the landward slope of the Palau Trench at approximately 6500 m depth, significantly deeper than the lysocline. This study aims to document the deep-sea carbon flux from the limestone block to seawater. The Sr isotope age of the limestone block indicates it formed in the middle and late Miocene, approximately 13–7 million years ago. Accelerator mass spectrometry measurements of the 14C of dissolved inorganic carbon (DIC) extracted from seawater collected around the limestone block yielded values as low as −295‰. Through isotope mass-balance calculations, we estimated the flux of limestone-derived carbonate ions to deep seawater, revealing that limestone-derived carbonate ions contribute up to 6.7% of the bottom water DIC concentration. The annual DIC flux from the limestone block is estimated to be 2.1 (±1.4) × 10^8 mol/y or 2.5 (±1.7) × 10^9 gC/y. These findings demonstrate a significant carbon flux into the deep-sea environment and represent the first example of carbonate dissolution occurring below the lysocline.

Download

Cite This Work

@article{05fddb67-ec57-4ef7-811b-1a19978a4c0c,
  title={Deep-sea limestone block as a source of14C-depleted dissolved inorganic carbon at the Palau Trench},
  author={Tatsuya Tsuboi and Hideki Wada},
  year={2013},
  language={en}
}
TY  - JOUR
TI  - Deep-sea limestone block as a source of14C-depleted dissolved inorganic carbon at the Palau Trench
AU  - Tatsuya Tsuboi
AU  - Hideki Wada
PY  - 2013
LA  - en
ER  -

Similar Items

The effect of bicarbonate on the microbial dissolution of autunite mineral in the presence of gram-positive bacteria

Paola M. Sepulveda-Medina, Yelena P. Katsenovich

Bacteria are key players in the processes that govern fate and transport of contaminants. The uranium release from Na and Ca-autunite by Arthrobacter

2015enPDF

Comparison of the kinetic rate law parameters for the dissolution of natural and synthetic autunite in the presence of aqueous bicarbonate ions

Ravi K.P. Gudavalli, Yelena P. Katsenovich

This research evaluated the effect of aqueous hydrogen carbonate solutions on the uranium rate of release from natural Ca-autunite and quantified the

2013enPDF

Dissolution of uranyl and plutonyl borates: Influences of crystalline structures and aqueous ligands

Yu Yang, Shu Wang

Novel crystalline actinide materials can be utilized for the immobilization of uranium and transuranium elements at radioactive waste disposal sites;

2013enPDF

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Estela Reinoso-Maset, Carl I. Steefel

Uranyl oxyhydroxide minerals are important weathering products in uranium-contaminated surface and subsurface environments that regulate dissolved ura

2017enPDF

Metallurgical Plant Design and Operating Strategies

P Card, J Canterford

This document presents a collection of papers from the METPLANT 2011 conference focusing on metallurgical plant design and operating strategies. The o

2011enPDF

Plant auditing: a powerful tool for improving metallurgical plant performance

Deepak Malhotra

This work discusses the essential components of a rigorous auditing process aimed at enhancing metallurgical plant performance. The objective is to id

2015enPDF