Holocene climate dynamics and construction of the pesqueiras in the NW Iberian Lower Miño River: an OSL approach

W. Viveen, J. Sanjurjo-Sanchez, J.M. Schoorl, A. Veldkamp

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

Abstract In the Lower Miño River basin a 15-m thick sandy fluvial sequence is found at the town of Chan de Vide, some 55 km upstream from the Atlantic Ocean. The deposit is exceptional because it is the only known sandy deposit in the upstream reaches of the Lower Miño area, which is dominated by coarse gravel deposits. The deposit is probably preserved because of its location in a structurally-controlled bend of the Miño River, shielding the deposit from the high-energy, erosive currents of the Miño River. A total of 8 samples were OSL-dated in the upper 9 m of the deposit. The oldest age obtained at the base of the deposit centres around 3.1 ka ago and the youngest sample 2 m under the top around 200 years ago. A linear sedimentation rate is observed from 3.1 ka until 1.0 ka ago, but from 1.0 ka onwards the sedimentation rate increases significantly. The deposit could be the result of increasing sea level during the Holocene, but the lower part of the deposit needs to be dated to confirm the onset of sedimentation. The most important result is that the increase in sedimentation rate around 1.0 ka is probably the result of the construction of a series of dams (pesqueiras) used for fishing purposes, just downstream of the studied deposit, which were first described around the 12th century. It is a strong indication that the pesqueiras indeed originate from the Middle Ages and not from Roman times, as postulated by some authors. Keywords Minho, sea-level changes, damming, sediment, OSL-dating
Original languageEnglish
Title of host publicationProceedings of the 7th on the Atlantic Iberian Margin, 16-20 december 2012, Lisboa, Portugal
Pages166-166
Publication statusPublished - 2012
Event7th Symposium on the Atlantic Iberian Margin, Lisboa, Portugal -
Duration: 16 Dec 201220 Dec 2012

Conference

Conference7th Symposium on the Atlantic Iberian Margin, Lisboa, Portugal
Period16/12/1220/12/12

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    Viveen, W., Sanjurjo-Sanchez, J., Schoorl, J. M., & Veldkamp, A. (2012). Holocene climate dynamics and construction of the pesqueiras in the NW Iberian Lower Miño River: an OSL approach. In Proceedings of the 7th on the Atlantic Iberian Margin, 16-20 december 2012, Lisboa, Portugal (pp. 166-166)