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Palaeoenvironmental changes in the Iberian central system during the Late-glacial and Holocene as inferred from geochemical data: A case study of the Navamuño depression in western Spain

Abstract: The Iberian Central System (ICS) is a clue region to reveal Mediterranean/Atlantic inferences over Iberia. We present a multidisciplinary study from western Spain conducted in the Navamuño depression (ND), covering the last 16.8 ka (cal BP). A reconstruction of the palaeotemperature from the resulting geochemical data highlights four cold and dry intervals, namely, the Oldest Dryas, Older Dryas, Intra-Allerød Cold Period (IACP), and the Younger Dryas, along with warmer intervals: the Bølling (14.7?14 ka) and the Allerød (12.9?12.6 ka); however, the Greenland Interstadial GI-1c (13.4?13.1 ka) is barely distinguishable in the ND. Despite the shortage of biomass to sustain fire, the earliest charcoals are from ~14.4?13.8 ka. Evidence of ash/dust events overprinting the geochemical background starts at ~13.8?12.8 ka. Significant fire activity in the Early Holocene at ~11.7?10.6 ka affected the ND, matching the westernmost ICS data. This period includes short oceanic spells inferred from Cl peaks at ~10.9?10.2 ka and three cold intervals at 11.4, 9.3, and 8.2 ka disrupted the progressive temperature increase. The Mid-Holocene showed a continuously increasing trend towards an arid climate, peaking at 4.2 ka under a pervasive dust influx from North Africa, which has prevailed since almost ~7.9 ka. A prominent volcanic event at ~6.8?5.8 ka is in Navamuño and Roñanzas (Asturias, N Spain; Gallego et al., 2013) identified from heavy metal-rich layer, synchronous with the last known eruption of the Calatrava volcanic field (South-Central Spain; Poblete-Piedrabuena et al., 2019). This volcanic eruption could affect many other regions half north of Iberia. The pervasive presence of oceanic aerosols in the last three millennia (2.8 ka ~ ) allowed the formation of a Cl-rich peat layer during the Ibero-Roman humid period ~2.1 ka, before a changing around ~0.4 ka toward colder and drier conditions at the Little Ice Age (LIA) period.

 Fuente: Catena 2021, 207, 105689

Editorial: Elsevier Science

 Fecha de publicación: 01/12/2021

Nº de páginas: 20

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.catena.2021.105689

ISSN: 0341-8162,1872-6887

Proyecto español: LATESICE-CGL2016-78380-P; FINICES- PID2020-117685 GB-I00

Url de la publicación: https://doi.org/10.1016/j.catena.2021.105689

Autores/as

TURU, VALENTÍ

CARRASCO, ROSA M.

LÓPEZ-SÁEZ, JOSÉ ANTONIO

PONTEVEDRA-POMBAL, XABIER

PEDRAZA, JAVIER

LUELMO-LAUTENSCHLAEGER, REYES

ECHEVERRIA-MORENO, ANNA

FRIGOLA, JAIME

ALBA-SÁNCHEZ, FRANCISCA

SÁNCHEZ-VIZCAÍNO, JESÚS

PÈLACHS-MAÑOSA, ALBERT

CUNILL-ARTIGAS, RAQUEL

NADAL-TERSA, JORDI

MUR-CACUHO, ELENA

SORIANO-LÓPEZ, JOAN MANUEL