14 C Ages of a Varved Last Glacial Maximum Section Off Pakistan

• Published in: Radiocarbon
• Main Authors: von Rad, Ulrich, Sarnthein, Michael, Grootes, Pieter M, Doose-Rolinski, Heidi, Erbacher, Jochen
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2003
• Subjects: General Earth and Planetary Sciences; Archeology; ice core
• Online Access: http://dx.doi.org/10.1017/s0033822200032811; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200032811

In a core off Pakistan, we obtained 38 14 C analyses by accelerator mass spectrometry (AMS) from a 4.4-m-thick, expanded, annually-laminated Last Glacial Maximum (LGM) section, bracketed by bioturbated intervals ascribed to the Heinrich-1 (H1) and Heinrich-2 (H2) equivalent events (52 14 C analyses between 24–15 kyr BP). A floating varve age scale, anchored to the oxygen isotope record of the layer-counted GISP2 ice core at the H2/LGM boundary, results in an annually dated record for the LGM from 23,450–17,900 cal BP. The floating varve scale of the LGM provides us with a tentative calibration of local marine AMS 14 C age dates to calendar years.