Universidad Peruana Cayetano Heredia

Latitudinal variability of preserved sedimentary organic matter along the Peruvian continental margin as inferred from petrographic and geochemical properties

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dc.contributor.author Igarza, Maricarmen
dc.contributor.author Boussafir, Mohammed
dc.contributor.author Graco, Michelle
dc.contributor.author Sifeddine, Abdelfetta
dc.contributor.author Valdés, Jorge
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.date.accessioned 2021-10-04T23:00:58Z
dc.date.available 2021-10-04T23:00:58Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/9847
dc.description.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 en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Marine Chemistry
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Argentina en_US
dc.subject biogeochemistry en_US
dc.subject Callao en_US
dc.subject chalcopyrite en_US
dc.subject continental margin en_US
dc.subject continental shelf en_US
dc.subject depositional environment en_US
dc.subject geochemistry en_US
dc.subject Ica en_US
dc.subject inorganic matter en_US
dc.subject latitudinal gradient en_US
dc.subject organic matter en_US
dc.subject Organic petrography en_US
dc.subject Peru en_US
dc.subject Peruvian continental margin en_US
dc.subject petrogenesis en_US
dc.subject petrography en_US
dc.subject Pisco en_US
dc.subject pyrite en_US
dc.subject Rock-Eval pyrolysis en_US
dc.subject San Juan [Argentina] en_US
dc.subject Sedimentary organic matter en_US
dc.subject Tumbes en_US
dc.title Latitudinal variability of preserved sedimentary organic matter along the Peruvian continental margin as inferred from petrographic and geochemical properties en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.marchem.2021.104004
dc.relation.issn 1872-7581


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