Interplay between detrital and diagenetic processes since the last glacial maximum on the northwest Iberian continental shelf Mohamed, Kais Jacob Rey, Daniel Rubio, Belen Vilas, Federico Frederichs, Thomas 2010-06-03T18:30:55Z 2010-06-03T18:30:55Z 2010-02
dc.description Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Quaternary Research 73 (2010): 507-520, doi:10.1016/j.yqres.2010.02.003. en_US
dc.description.abstract Integrated analyses of magnetic, geochemical and textural data on six cores from the northwestern Iberian continental shelf allowed the reconstruction of the paleoenvironmental evolution of this area since the last glacial maximum (LGM). Four sedimentary units were identified, representing a succession from fluvial and subaerial settings to high and finally low-energy marine deposits subsequent to the post-LGM sea evel rise. The uppermost unit was deposited during the Holocene and its magnetic properties were controlled by the interplay between detrital input and early diagenetic reductive dissolution of magnetic minerals. Identification of a primary steady-state early diagenetic signal allowed the recognition of periods of increased detrital input bounded by intervals of lower detrital input and intensified reductive diagenesis related related to upwelling intensifications in the area. These paleoenvironmental alternations are consistent with the climatic evolution of the late Holocene. During the Roman Warm Period (RWP) and Medieval Warm Period (MWP), the combined effect of greater humidity and intense agricultural and mining activities led to a greater erosion and transport of detrital sediments to the shelf. In contrast, enhanced diagenetic reduction intervals, caused by upwelling intensification, were roughly coincident with the colder Dark Ages (DA) and the Little Ice Age (LIA). en_US
dc.description.sponsorship Contribution to projects CTM2007-61227/MAR and REN2003-02822 funded by the Spanish MICINN. Partial contribution to projects PGIDIT06TAM31201PR and IN825B funded by Xunta de Galicia and NACSA 236962 and ANCORIM funded by the EU. The EU Paleostudies program funded the stay of Kais J. Mohamed in Bremen. K. J. Mohamed wishes to acknowledge joint funding from the Fulbright Program and the Spanish Ministry of Education and Science and the Marie Curie International Outgoing Fellowships within the 7th European Community Framework Programme. en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.subject Environmental magnetism en_US
dc.subject Detrital input en_US
dc.subject Iberian continental shelf en_US
dc.subject Early diagenesis en_US
dc.subject Paleoclimatic evolution en_US
dc.subject Upwelling en_US
dc.title Interplay between detrital and diagenetic processes since the last glacial maximum on the northwest Iberian continental shelf en_US
dc.type Preprint en_US
dspace.entity.type Publication
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