1969
DOI: 10.1017/s0033822200011267
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Gif Natural Radiocarbon Measurements IV

Abstract: This list reports certain measurements made from 1965 to 1967. These samples are devoted to a special study of organic matter in soils. The work in large part is the subject of a thesis defended in Paris by S. M. Nakhla, 1968.

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“…However, the occurrence of numerous flank collapse events reported during the PN build-up (e.g., Bachèlery et al, 2003;Oehler et al, 2004;Oehler et al, 2008) is still a matter of debate. Note that two questionable ages performed on pyroclastics deposits (12 ± 3 ka using the U-Th method; Deniel et al, 1992, and 21.9 ± 0.3 ka based on the 14 C method; Delibrias et al, 1986) will not be considered as they do not correlate with ages performed on the same deposits by other methods.…”
Section: Geological and Geomorphological Settingmentioning
confidence: 99%
“…However, the occurrence of numerous flank collapse events reported during the PN build-up (e.g., Bachèlery et al, 2003;Oehler et al, 2004;Oehler et al, 2008) is still a matter of debate. Note that two questionable ages performed on pyroclastics deposits (12 ± 3 ka using the U-Th method; Deniel et al, 1992, and 21.9 ± 0.3 ka based on the 14 C method; Delibrias et al, 1986) will not be considered as they do not correlate with ages performed on the same deposits by other methods.…”
Section: Geological and Geomorphological Settingmentioning
confidence: 99%
“…Further dating performed on a sample of calcareous crust taken from a rhyolite block located 75 m father down, at 1775 m altitude, provided an age of 12,400 ± 400 yr B.P. (Delibrias et al, 1969;Faure, 1969) (Table 1).…”
Section: Lacustrine Deposits and Chronologymentioning
confidence: 99%
“…Et la date de 1985 ± 45 BP donnée par un Bh voisin (SBM 1 non figé sous un rocher) montre que ce processus était actif au cours du premier millénaire apr. J.-C. Ceci se trouve encore confirmé par les âges de 2700 et 2760 ± 150 BP mesurés par Delibrias et al dans les dunes de la forêt[1] et de 2100 ± 50 BP du podzol proche de la Croix du Grand Veneur[3], pour lequel la palynologie indique l'abondance de callune. Dans le sol LC, la concentration de matière organique des agrégats noirs permettait de penser que ceux-ci seraient plus anciens que les grains bruns revêtus, manifestant ainsi deux grandes phases de podzolisation : mais tel n'est pas le cas, puisque ces derniers ont un âge moyen plus ancien (1240± 30 BP) que les agrégats noirs (1075 ± 30 BP).…”
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