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(super 14) C ages of a varved last glacial maximum section off Pakistan.

Rad Ulrich von, Michael Sarnthein, Pieter M Grootes, Rolinski Heidi Doose, Jochen Erbacher

Abstract


In a core off Pakistan, we obtained 38 (super 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 (super 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 (super 14) C age dates to calendar years.

Keywords


Arabian Sea;continental margin;Globigerinoides ruber;hemipelagic environment;turbidite;Pakistan;Indian Ocean;O 18 O 16;Globigerinacea;Globigerinidae;Globigerinoides;Rotaliina;accelerator mass spectra;GISP2;planar bedding structures;sedimentary structures;varves;cores;oxygen;marine environment;marine sediments;Foraminifera;Protista;mass spectra;spectra;isotope ratios;microfossils;correlation;last glacial maximum;Pleistocene;upper Pleistocene;sediments;Asia;Cenozoic;Quaternary;Indian Peninsula;C 14;carbon;isotopes;radioactive isotopes;Invertebrata;stable isotopes;absolute age

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