(Table 2) Radiocarbon dates and age calibration


The high-energy, low-accumulation NW Iberian shelf features three confined Holocene mud depocentres. Here, we show that the evolution of such depocentres follows successive steps. The flooding of inner shelf zones and river catchment areas by the late deglacial sea-level rise provided the precondition for shelf mud deposition. Following this, the Holocene deceleration of the sea-level rise caused a rapid refill of the accommodation space within river valleys. Subsequently, the export of major amounts of fines was initiated. The initial onset and loci of shelf mud deposition were related to deposition-favouring conditions in mid-shelf position or to the presence of morphological highs, which act as sediment traps by providing protection against stronger hydrodynamic energy. The detailed reconstruction of the Holocene depocentre evolution shows for the first time that the expansion of such shelf mud deposits cannot only occur by linear growth off the associated sediment source. Rather, they might develop around centres that are fully disconnected from the source of original sediment supply, and expand later into specific directions. Based on these differences and on the connection of the individual mud depocentres to the material source we propose a conceptual subdivision of the group "mid-shelf mud depocentres".

Lab no: Radiocarbon laboratory: KIA = Leibniz Laboratory in Kiel (Germany); Poz = Poznan Radiocarbon Laboratory (Poland).Material: bF = benthic foraminifers; E. crispum = Elphidium crispum (monospecific sample); bv = bivalve; gp = gastropod.Age, minimum/young and Age, maximum/old: For reservoir correction, the conventional age of 400 years is applied using CALIB 5.0.1. (Stuiver et al., 1998).d: Age calibration is based on the function of Bard et al. (1998).

Supplement to: Lantzsch, Hendrik; Bender, Vera Barbara; Hanebuth, Till J J (2009): Holocene evolution of mud depocentres on a high-energy, low-accumulation shelf (NW Iberia). Quaternary Research, 72(3), 325-336

DOI https://doi.org/10.1594/PANGAEA.738404
Related Identifier https://doi.org/10.1016/j.yqres.2009.07.009
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.738404
Creator Lantzsch, Hendrik ORCID logo; Hanebuth, Till J J ORCID logo; Bender, Vera Barbara (ORCID: 0000-0002-4331-462X)
Publisher PANGAEA
Publication Year 2010
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 177 data points
Discipline Earth System Research
Spatial Coverage (-9.268W, 41.551S, -8.974E, 42.817N)
Temporal Coverage Begin 2006-08-22T07:20:00Z
Temporal Coverage End 2008-06-09T06:24:00Z