Iron availability as a dominant control ...
Document type :
Article dans une revue scientifique
Title :
Iron availability as a dominant control on the primary composition and diagenetic overprint of organic-matter-rich rocks
Author(s) :
Tribovillard, N. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Hatem, E. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Averbuch, Olivier [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Barbecot, F. [Auteur]
Université du Québec à Montréal = University of Québec in Montréal [UQAM]
Bout-Roumazeilles, V. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Trentesaux, Alain [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Hatem, E. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Averbuch, Olivier [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Barbecot, F. [Auteur]
Université du Québec à Montréal = University of Québec in Montréal [UQAM]
Bout-Roumazeilles, V. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Trentesaux, Alain [Auteur]

Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Journal title :
Chemical Geology
Pages :
67-82
Publisher :
Elsevier
Publication date :
2015
ISSN :
0009-2541
English keyword(s) :
Geochemistry
Organic matter preservation
Iron shuttle
Arsenic
Molybdenum
Antimony
Organic matter preservation
Iron shuttle
Arsenic
Molybdenum
Antimony
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre/Géochimie
English abstract : [en]
Iron is known to stimulate surface ocean productivity, as well as intervene with bacterially-mediated processes of organic matter remineralization, during early diagenesis. In this paper, we examine the influence of iron ...
Show more >Iron is known to stimulate surface ocean productivity, as well as intervene with bacterially-mediated processes of organic matter remineralization, during early diagenesis. In this paper, we examine the influence of iron supply on the geochemistry (trace metals, δ34S, organic matter) of sedimentary rocks deposited in a clastic-dominated marine ramp environment. To this end, we studied two Late Jurassic formations of the Boulonnais area (North-France). Both formations were deposited under quite similar conditions, but they differ in the reactive-iron supply they received. Only one of the two formations was affected by the particulate iron shuttle process. Our results indicate that 1)the iron shuttle may be recorded through concomitant enrichments in P, Mo, As and Sb; 2)a limited reactive-iron supply will allow the sulfurization of organic matter, even in a context of moderate productivity. Thus sulfurization can be a factor favoring a noticeable accumulation of organic matter: iron may thus be an important agent in the C cycle.Show less >
Show more >Iron is known to stimulate surface ocean productivity, as well as intervene with bacterially-mediated processes of organic matter remineralization, during early diagenesis. In this paper, we examine the influence of iron supply on the geochemistry (trace metals, δ34S, organic matter) of sedimentary rocks deposited in a clastic-dominated marine ramp environment. To this end, we studied two Late Jurassic formations of the Boulonnais area (North-France). Both formations were deposited under quite similar conditions, but they differ in the reactive-iron supply they received. Only one of the two formations was affected by the particulate iron shuttle process. Our results indicate that 1)the iron shuttle may be recorded through concomitant enrichments in P, Mo, As and Sb; 2)a limited reactive-iron supply will allow the sulfurization of organic matter, even in a context of moderate productivity. Thus sulfurization can be a factor favoring a noticeable accumulation of organic matter: iron may thus be an important agent in the C cycle.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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