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A High-Resolution 14C Chronology Tracks Pulses of Aggradation of Glaciofluvial Sediment on the Cormor Megafan between 45 and 20 ka BP

Published online by Cambridge University Press:  22 March 2018

Kristina Hippe ,
Alessandro Fontana ,
Irka Hajdas  and
Susan Ivy-Ochs
Kristina Hippe*
Affiliation:
Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, CH-8093 Zürich, Switzerland
Alessandro Fontana
Affiliation:
Università degli Studi di Padova, Dipartimento di Geoscienze, Via Gradenigo 6, 35131 Padova, Italy
Irka Hajdas
Affiliation:
Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, CH-8093 Zürich, Switzerland
Susan Ivy-Ochs
Affiliation:
Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, CH-8093 Zürich, Switzerland
*
*Corresponding author. Email: [email protected].
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Abstract

During the Last Glacial Maximum (LGM) the Tagliamento glacier delivered large amounts of sediment to the Cormor alluvial megafan on the southern Alpine foreland basin. To build a chronology of Late Pleistocene glacier fluctuations and assess the timing of the transition from interstadial to glacial conditions, we have performed radiocarbon (14C) dating on peat and macrofossil samples obtained from a drilling core from the distal Cormor megafan. Our chronology records fluvial and glaciofluvial aggradation from the end of MIS 3 until the end of the LGM. It shows a rapid transmission of signals of environmental change along the Cormor megafan, so that changes in the activity of the Tagliamento glacier directly affect glaciofluvial sedimentation. Our data demonstrate that the intrinsic heterogeneity of peat is most critical for the reliability and reproducibility of the obtained 14C ages. Macrofossil subsamples give evidence for significant mixing of organic components of different ages within single peat samples. Sample heterogeneity is also underlined by the results obtained from testing of different laboratory precleaning methods. Our results suggest that a rigorous ABA pretreatment is sufficient for peat cleaning. In contrast, the chemically stronger ABOX methods appear to rapidly degrade the peat, particularly destroying older organic components.

Keywords

Alluvial megafanLGMradiocarbonSouthern AlpsTagliamento glacier
Type
Research Article
Information
Radiocarbon , Volume 60 , Issue 3 , June 2018 , pp. 857 - 874
Copyright
© 2018 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

Ascough, PL, Bird, MI, Brock, F, Higham, TFG, Meredith, W, Snape, CE, Vane, CH. 2009. Hydropyrolysis as a new tool for radiocarbon pretreatment and the quantification of black carbon. Quaternary Geochronology 4(2):140–147.Google Scholar
Bird, MI, Ayliffe, LK, Fifield, LK, Turney, CSM, Cresswell, RG, Barrows, TT, David, B. 1999. Radiocarbon dating of “old” charcoal using a wet oxidation, stepped-combustion procedure. Radiocarbon 41(2):127–140.CrossRefGoogle Scholar
Bird, MI, Levchenko, V, Ascough, PL, Meredith, W, Wurster, CM, Williams, A, Tilston, EL, Snape, CE, Apperley, DC. 2014. The efficiency of charcoal decontamination for radiocarbon dating by three pretreatments—ABOX, ABA and hypy. Quaternary Geochronology 22:25–32.Google Scholar
Blaauw, M, van der Plicht, J, van Geel, B. 2004. Radiocarbon dating of bulk peat samples from raised bogs: nonexistence of a previously reported “reservoir effect”? Quaternary Science Reviews 23(14–15):1537–1542.Google Scholar
Carminati, E, Doglioni, C, Scrocca, D. 2003. Apennines subduction-related subsidence of Venice (Italy). Geophysical Research Letters 30:13.Google Scholar
Castiglioni, GB. 1997. Geomorphological Map of Po Plain. Scale 1:250,000, MURST-S.El.Ca, 3 sheets, Firenze, Italia.Google Scholar
Ehlers, J, Gibbard, PL, Hughes, PD. 2011. Quaternary Glaciations – Extent and Chronology, A Closer Look, 1st ed., Developments in Quaternary Sciences 15:1126 p.Google Scholar
Fontana, A. 2006. Evoluzione geomorfologica della bassa pianura friulana e sue relazioni con le dinamiche insediative antiche. Udine. Monografie Museo Friulano Storia Naturale 47:288 p.Google Scholar
Fontana, A, Mozzi, P, Bondesan, A. 2008. Alluvial megafans in the Venetian-Friulian Plain (north-eastern Italy): Evidence of sedimentary and erosive phases during Late Pleistocene and Holocene. Quaternary International 189:71–90.Google Scholar
Fontana, A, Mozzi, P, Bondesan, A. 2010. Late pleistocene evolution of the Venetian-Friulian Plain. Rendiconti Lincei–Scienze Fisiche e Naturali 21(S1):181–196.Google Scholar
Fontana, A, Mozzi, P, Marchetti, M. 2014a. Alluvial fans and megafans along the southern side of the Alps. Sedimentary Geology 301:150–171.Google Scholar
Fontana, A, Monegato, G, Zavagno, E, Devoto, S, Burla, I, Cucchi, F. 2014b. Evolution of an Alpine fluvioglacial system at the LGM decay: the Cormor megafan (NE Italy). Geomorphology 204:136–153.Google Scholar
Gillespie, R, Hammond, AP, Goh, KM, Tonkin, PJ, Lowe, DC, Sparks, RJ, Wallace, G. 1992. AMS dating of a Late Quaternary tephra at Graham Terrace, New Zealand. Radiocarbon 34(1):21–27.Google Scholar
Gillespie, R. 1997. Burnt and unburnt carbon: dating charcoal and burnt bone from the Willandra Lakes, Australia. Radiocarbon 39(3):239–250.CrossRefGoogle Scholar
Hajdas, I. 1993. Extension of the radiocarbon calibration curve by AMS dating of laminated sediments of lake Soppensee and lake Holzmaar. Dissertation Nr. 10157. ETH Zürich. 147 p.Google Scholar
Hajdas, I, Hendriks, L, Fontana, A, Monegato, G. 2016. Evaluation of preparation methods in radiocarbon dating of old wood. Radiocarbon 59(3):727–737.Google Scholar
Hatté, C, Morvan, J, Noury, C, Paterne, M. 2001. Is classical acid-alkali-acid treatment responsible for contamination? An alternative proposition. Radiocarbon 43(2A):177–182.CrossRefGoogle Scholar
Higham, T, Brock, F, Peresani, M, Broglio, A, Wood, R, Douka, K. 2009a. Problems with radiocarbon dating the Middle to Upper Palaeolithic transition in Italy. Quaternary Science Reviews 28(13–14):1257–1267.Google Scholar
Higham, TFG, Barton, H, Turney, CSM, Barker, G, Ramsey, CB, Brock, F. 2009b. Radiocarbon dating of charcoal from tropical sequences: results from the Niah Great Cave, Sarawak, and their broader implications. Journal of Quaternary Science 24(2):189–197.Google Scholar
Kilian, MR, van der Plicht, J, van Geel, B. 1995. Dating raised bogs: new aspects of AMS C-14 wiggle matching, a reservoir effect and climatic change. Quaternary Science Reviews 14(10):959–966.Google Scholar
Lowick, SE, Preusser, F, Pini, R, Ravazzi, C. 2010. Underestimation of fine grain quartz OSL dating towards the Eemian: comparison with palynostratigraphy from Azzano Decimo, northeastern Italy. Quaternary Geochronology 5:583–590.CrossRefGoogle Scholar
Miola, A, Bondesan, A, Corain, L, Favaretto, S, Mozzi, P, Piovan, S, Sostizzo, I. 2006. Wetlands in the Venetian po plain (northeastern Italy) during the last glacial maximum: interplay between vegetation, hydrology and sedimentary environment. Review of Palaeobotany and Palynology 141(1–2):53–81.CrossRefGoogle Scholar
Monegato, G, Ravazzi, C, Donegana, M, Pini, R, Calderoni, G, Wick, L. 2007. Evidence of a two–fold glacial advance during the last glacial maximum in the Tagliamento end moraine system (eastern Alps). Quaternary Research 68(2):284–302.Google Scholar
Monegato, M, Scardia, G, Hajdas, I, Rizzini, F, Piccin, A. 2017. The Alpine LGM in the boreal ice-sheets game. Scientific Reports 7(2078 doi: 10.1038/s41598–017–02148–7.Google Scholar
Nilsson, M, Klarqvist, M, Bohlin, E, Possnert, G. 2001. Variation in C-14 age of macrofossils and different fractions of minute peat samples dated by AMS. Holocene 11(5):579–586.Google Scholar
Paiero, G, Monegato, G. 2003. The Pleistocene evolution of Arzino alluvial fan and western part of Tagliamento morainic amphitheater (Friuli, NE Italy). Il Quaternario. Italian Journal of Quaternary Sciences 16(2):185–193.Google Scholar
Pini, R, Ravazzi, C, Donegana, M. 2009. Pollen stratigraphy, vegetation and climate history of the last 215 ka in the Azzano Decimo core (plain of Friuli, north-eastern Italy). Quaternary Science Reviews 28(13–14):1268–1290.CrossRefGoogle Scholar
Pini, R, Ravazzi, C, Reimer, PJ. 2010. The vegetation and climate history of the last glacial cycle in a new pollen record from Lake Fimon (southern Alpine foreland, N-Italy). Quaternary Science Reviews 29:3115–3137.CrossRefGoogle Scholar
Ramsey, CB. 2008. Deposition models for chronological records. Quaternary Science Reviews 27(1–2):42–60.Google Scholar
Ramsey, CB. 2009. Bayesian analysis of radiocarbon dates. Radiocarbon 51(1):337–360.Google Scholar
Reimer, PJ, Bard, E, Bayliss, A, Beck, JW, Blackwell, PG, Ramsey, CB, Buck, CE, Cheng, H, Edwards, RL, Friedrich, M, Grootes, PM, Guilderson, TP, Haflidason, H, Hajdas, I, Hatte, C, Heaton, TJ, Hoffmann, DL, Hogg, AG, Hughen, KA, Kaiser, KF, Kromer, B, Manning, SW, Niu, M, Reimer, RW, Richards, DA, Scott, EM, Southon, JR, Staff, RA, Turney, CSM, van der Plicht, J. 2013. IntCal13 and Marine13 radiocarbon age calibration curves 0–50,000 years cal BP. Radiocarbon 55(4):1869–1887.Google Scholar
Rossato, S, Mozzi, P. 2016. Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy). Quaternary Science Reviews 148:115–127.Google Scholar
Santos, GM, Bird, MI, Pillans, B, Fifield, LK, Alloway, BV, Chappell, J, Hausladen, PA, Arneth, A. 2001. Radiocarbon dating of wood using different pretreatment procedures: application to the chronology of Rotoehu Ash, New Zealand. Radiocarbon 43(2A):239–248.Google Scholar
Santos, GM, Ormsby, K. 2013. Behavioral variability in ABA chemical pretreatment close to the 14C age limit. Radiocarbon 55(2–3):534–544.CrossRefGoogle Scholar
Smith, MA, Bird, MI, Turney, CSM, Fifield, LK, Santos, GM, Hausladen, PA, di Tada, ML. 2001. New ABOX AMS-14C ages remove dating anomalies at Puritjarra rock shelter. Australian Archaeology 53:45–47.Google Scholar
Stuiver, M, Polach, HA. 1977. Reporting of 14C data: discussion. Radiocarbon 19(3):355–363.Google Scholar
Synal, HA, Stocker, M, Suter, M. 2007. MICADAS: a new compact radiocarbon AMS system. Nuclear Instruments & Methods in Physics Research B 259(1):7–13.CrossRefGoogle Scholar
Toscani, G, Marchesini, A, Barbieri, C, Di Giulio, A, Fantoni, R, Mancin, N, Zanferrari, A. 2016. The Friulian-Venetian Basin I: architecture and sediment flux into a shared foreland basin. Italian Journal of Geosciences 135(3):444–459.CrossRefGoogle Scholar
Törnqvist, TE, Van Dijk, TJ. 1993. Optimizing sampling strategy for radiocarbon dating of Holocene fluvial systems in a vertically aggrading setting. Boreas 22(2):129–145.Google Scholar
Wacker, L, Nemec, M, Bourquin, J. 2010. A revolutionary graphitisation system: fully automated, compact and simple. Nuclear Instruments & Methods in Physics Research B 268(7–8):931–934.Google Scholar
Wood, RE, Douka, K, Boscato, P, Haesaerts, P, Sinitsyn, A, Higham, TFG. 2012. Testing the ABOx–SC method: dating known-age charcoals associated with the Campanian Ignimbrite. Quaternary Geochronology 9:16–26.CrossRefGoogle Scholar
Zanferrari, A, Avigliano, R, Fontana, A, Paiero, G. 2008a. Note illustrative della Carta Geologica d’Italia alla scala 1:50.000–Foglio 086 “San Vito al Tagliamento”. Tavagnacco: Graphic Linea. 190 p.Google Scholar
Zanferrari, A, Avigliano, R, Monegato, G, Paiero, G, Poli, ME. 2008b. Note illustrative della Carta Geologica d’Italia alla scala 1:50.000–Foglio 066 “Udine”. Tavagnacco: Graphic Linea. 176 p.Google Scholar