Glaciation in the Eastern Pyrenees between NGRIP/GRIP GS-9 and GS-2a stadials: 25,000 years of palaeoenvironmental record in the Valira Valleys (Principality of Andorra)
Interacció administrativa entre la Generalitat i l’Administració local en els...
Similaire à Glaciation in the Eastern Pyrenees between NGRIP/GRIP GS-9 and GS-2a stadials: 25,000 years of palaeoenvironmental record in the Valira Valleys (Principality of Andorra)
Similaire à Glaciation in the Eastern Pyrenees between NGRIP/GRIP GS-9 and GS-2a stadials: 25,000 years of palaeoenvironmental record in the Valira Valleys (Principality of Andorra) (20)
Cot curve, melting temperature, unique and repetitive DNA
Glaciation in the Eastern Pyrenees between NGRIP/GRIP GS-9 and GS-2a stadials: 25,000 years of palaeoenvironmental record in the Valira Valleys (Principality of Andorra)
1. Glaciation in the Eastern Pyrenees between NGRIP/GRIP GS-9 and
GS-2a stadials: 25,000 years of palaeoenvironmental record in the
Valira Valleys (Principality of Andorra)
Valentí Turu and Guy Jalut
Marcel Chevalier Earth Science Foundation, Ed. sociocultural La Llacuna, AD500 Andorra la Vella, Principality of Andorra.
Corresponding author (E-mail: igeofundacio@andorra.ad
2. AMS 14C dating and δ13C
Total carbon (bulk) from
• Pure colluvial
• Colluvial-alluvial mixture
• Supraglacial-colluvial m.
• Subglacial till
• Gl-Fl over bedrock
δ13C from vegetation average
and can be used as a proxy
• No laminites has been
dated (aquatic plants), only
subaerial sediments except
subglacial tills (mixture)
3. Glaciolacustrine
geochemistry
• 232 stratigraphical descriptions
• Basin analysis using sequence
stratigraphy (Turu et al., 2016).
• Chronostratigraphic benchmark for
paleoenvironmental studies
• Online database
• Depicting the paleolake alkalinity
using 21 samples
• Major elements (Al, Si, Ca, Ti, ..)
• Proxys: Ca, Fe, Al, Ti
• Al/Ti ratio as detrital proxy
4. La Massana paleolake
TURU. V., CALVET, M., BORDONAU J., GUNNELL, Y., DELMAS M.,
VILAPLANA J.M. & JALUT, G. (2016) Did Pyrenean glaciers
dance to the beat of global climatic events? Evidence from the
Wurmian sequence stratigraphy of an ice-dammed palaeolake
depocentre in Andorra; HUGHES P.D. & WOODWARD J.C. (eds)
Quaternary Glaciation in the Mediterranean Mountains.
Geological Society, London, SP 433. DOI: 10.1144/SP433.6
15. Conclusions
• Five aridity cycles, one each 4 Ka (FFT)
• Three Heinrich events, one each 6.1 Ka (FFT)
• These climatic events may be independent but
their interference produce abrupt climatic
shiftings between 17 and 36 Ka (19,000 yrs)
• For that reason He are barely recognizable