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The Ria de Muros is the northernmost of the 4 Rias Baixas and, like the others, is subject to seasonal upwelling. The high organic carbon content of its sediments (average 2.4%) is due to the consequent high primary production together with significant continental input from river discharge and runoff. This high organic carbon content not only favours early diagenesis, but does so to an extent that depends on the relative proportions of labile marine organic carbon and refractory terres- trial organic carbon. Thus, changes in early diagenesis reflected in the mineralogy and/or composi- tion of the Ria's sediments can throw light on the degree of oceanic influence in the Ria, and hence on changes in the circulation and ventilation of its water masses and/or the climate on shore. In this study of sediment cores taken in the outer Ria de Muros, the combined use of textural analysis, mag- netic properties (magnetic susceptibility (κ), ratio of anhysteretic to isothermal remanent magnetisa- tion (ARM:IRM), and median destructive field (MDF)) and geochemical parameters (total concentra- tions of diagenetically stable and mobile elements in sediment and pore water) allowed the identification of a current redox front and 2 palaeosedimentary redox fronts in the sediment record. These fronts originated during periods of high marine/terrestrial organic matter ratio (as inferred from the ratio of total organic carbon to total nitrogen (TOC:TN) and δ 13 C). Sedimentation rates calcu- lated from 14 C dating results identify these periods as known periods of increased upwelling and reduced continental input due to colder, drier climate in the NW Iberian Peninsula, namely the Little Ice Age, the Dark Ages, and first cold period of the Upper Holocene.

climate research

Palaeoclimatic changes in the NW Iberian ­Peninsula during the last 3000 years inferred from ­diagenetic ­proxies in the Ría de Muros sedimentary record

Palaeoclimatic changes in the NW Iberian ­Peninsula during the last 3000 years inferred from ­diagenetic ­proxies in the Ría de Muros sedimentary record

Palaeoclimatic changes in the NW Iberian Peninsula during the last 3000 years inferred from diagenetic proxies in the Ría de Muros sedimentary record