First high-resolution multi-proxy palaeoenvironmental record of the Late Glacial to Early Holocene transition in the Ilia de Arousa (Atlantic margin of NW Iberia)

QUATERNARY SCIENCE REVIEWS

卷:215

Article

Garcia-Moreiras, Iria¹  Cartelle, Victor^2,3,4  Garcia-Gil, Soledad^3,4  Munoz Sobrino, Castor¹ 

[1] Univ Vigo, CIM UVIGO, Dept Plant Biol & Soil Sci, Fac Sci, E-36310 Vigo, Spain

[2] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England

[3] Univ Vigo, CIM UVIGO, E-36310 Vigo, Spain

[4] Univ Vigo, Dept Marine Geosci, Fac Sci, E-36310 Vigo, Spain

关键词: Late Pleistocene-Holocene transition;    Palaeoclimatology;    Southern Europe;    Lithology;    Seismic stratigraphy;    Pollen Dinoflagellate cysts;    Non-pollen palynomorphs;    Vegetation dynamics;   

DOI  :  10.1016/j.quascirev.2019.05.016

来源: Elsevier

【 摘 要 】

A 322-cm-long sedimentary sequence obtained in the shallow marine basin of the Ria de Arousa-a submerged unglaciated river valley on the Atlantic margin of northwestern Iberia-was analysed using a multi-proxy approach to study how climatic and sea level changes affected the coastal ecosystems during the Last Glacial-Interglacial Transition. Past sedimentation, vegetation and marine productivities were inferred from palynological, radiocarbon, seismic and lithological data. A substantial reduction in the pollen and dinoflagellate cyst accumulation rates is observed at -12,700 to 11,700 cal a BP, suggesting lower marine and vegetation productivities likely as a response to the Younger Dryas cooling event. Overall, the regional vegetation changed from cold-tolerant open woodlands (Pinus sylvestris/P. nigra and Betula) dominating before similar to 10,200 cal a BP to coastal wetlands and the regional spread of Quercus-dominated forests after-9800 cal a BP. Cluster analysis and principal component analysis allowed the identification of several small environmental oscillations, such as the 11.4 ka and 10.5 ka cooling events. After that, a conspicuous heath expansion was likely favoured by the palaeotopography, the increased precipitation and the relative sea level rise, which might have caused a profound change in the coastal configuration. Concurrently, both the dinoflagellate cyst and non-pollen palynomorph records reveal variations in the marine productivity and coastal hydrodynamics that also agree with a period of marked marine transgression, warming and increasing river flow. New sedimentary data highlight the high sensitivity of the ria's ecosystems to environmental oscillations and show a close temporal correspondence between terrestrial and marine responses to climate change. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free