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Latitudinal variability of preserved sedimentary organic matter along the Peruvian continental margin as inferred from petrographic and geochemical properties
Indexado
WoS WOS:000692441600001
Scopus SCOPUS_ID:85110138716
DOI 10.1016/J.MARCHEM.2021.104004
Año 2021
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



Processes controlling preservation and accumulation of organic matter (OM) in marine sediments are highly sensitive towards both natural and anthropogenic impacts. Thus, the sedimentary OM is considered a key proxy for the characterization of recent and past sedimentary environments. Along the Peruvian continental margin (PCM), high primary production and an intense oxygen minimum zone (OMZ) favor the accumulation and preservation of OM in sediments. Spatial variations in oceanographic conditions impact on both productivity and the redox conditions, in particular the OMZ intensity. These factors in turn lead to spatial differences in depositional conditions and OM accumulation and preservation. Therefore, this study aims at characterizing nature and types of recent sedimentary OM along the PCM covering a wide latitudinal and bathymetric range. With this purpose, a total of 29 surface sediment samples were collected from Tumbes (3°S) to San Juan (15°S) and analyzed by means of organic petrography (palynofacies analysis) and Rock-Eval pyrolysis. Results allowed characterizing the OM from recent sediments. Along the PCM, the sedimentary OM is predominantly amorphous, revealing its overwhelming marine origin. The highest abundances of gelified amorphous OM, total organic carbon, S1 and S2 Rock-Eval fractions occurred towards the southern part of the study area, especially off Callao (12°S) and Pisco (14°S), considered important upwelling and primary productivity centers. A principal component analysis performed allowed the description of main OM depositional environments. In the outer continental shelf of Callao (12°S) and OMZ of Pisco (14°S), accumulation of well-preserved OM occurs whereas in the inner shelf of Callao redox oscillations lead to less OM accumulation and pyrite formation in sediments. North of Callao, from Tumbes (3°S) to Huacho (11°S), a mixed signal of OM accumulation was observed. Finally, along the slope, transportation processes seem to play a key role in OM accumulation. This study also allowed the evaluation of certain proxies (e.g. Rock-Eval hydrogen index and oxygen index) routinely used in palaeoceanographic studies.

Revista



Revista ISSN
Marine Chemistry 0304-4203

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Disciplinas de Investigación



WOS
Oceanography
Chemistry, Multidisciplinary
Scopus
Oceanography
Chemistry (All)
Water Science And Technology
Environmental Chemistry
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Igarza, Maricarmen - Universidad Peruana Cayetano Heredia - Perú
Instituto del Mar del Perú - Perú
UNIV PERUANA CAYETANO HEREDIA - Perú
Inst del Mar Peru - Perú
2 Boussafir, Mohammed Hombre Institut des Sciences de la Terre d'Orléans (ISTO) - Francia
E.A 6293 GéoHydrosystèmes COntinentaux - Francia
Inst Sci Terre Orleans - Francia
Univ Tours - Francia
Earth Sciences Institute of Orléans - Francia
3 Graco, Michelle I. Mujer Universidad Peruana Cayetano Heredia - Perú
Instituto del Mar del Perú - Perú
UNIV PERUANA CAYETANO HEREDIA - Perú
Inst del Mar Peru - Perú
4 Sifeddine, Abdelfettah Hombre IRD Centre d'Ile-de-France - Francia
Sorbonne Univ - Francia
5 VALDES-SAAVEDRA, JORGE RUBEN Hombre Universidad de Antofagasta - Chile
6 Gutierrez, D. Hombre Universidad Peruana Cayetano Heredia - Perú
Instituto del Mar del Perú - Perú
UNIV PERUANA CAYETANO HEREDIA - Perú
Inst del Mar Peru - Perú

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Financiamiento



Fuente
MINEDUC-UA
Institut de recherche pour le développement
Instituto del Mar del Perú
Peruvian National Council of Science and Technology
Universidad Peruana Cayetano Heredia
Instituto del Mar del Per?
ISTO
Institut de Sciences de la Terre
Institut de Sciences de la Terre d'Orléans

Muestra la fuente de financiamiento declarada en la publicación.

Agradecimientos



Agradecimiento
We would like to thank the Institut de Recherche pour le Développement (IRD) and the Institut de Sciences de la Terre d'Orléans (ISTO) that made possible, through its projects LMI PALEOTRACES and PROSUR, the four months internship of M. Igarza to perform all geochemical analyses. J. Valdés was supported by MINEDUC-UA grant, ANT 1855 .
This work was supported by the Peruvian National Council of Science and Technology (Contrato No. 223-2010-CONCYTEC-OAJ ) through a fellowship awarded to M. Igarza to perform her master studies in Marine Science at Universidad Peruana Cayetano Heredia (UPCH).
We would like to thank the Institut de Recherche pour le Développement (IRD) and the Institut de Sciences de la Terre d'Orléans (ISTO) that made possible, through its projects LMI PALEOTRACES and PROSUR, the four months internship of M. Igarza to perform all geochemical analyses. J. Valdés was supported by MINEDUC-UA grant, ANT 1855 .
This work was supported by the Peruvian National Council of Science and Technology (Contrato No. 223-2010-CONCYTEC-OAJ) through a fellowship awarded to M. Igarza to perform her master studies in Marine Science at Universidad Peruana Cayetano Heredia (UPCH).

Muestra la fuente de financiamiento declarada en la publicación.