δ13C(organic), C/N mass ratios and %TOC for Continent Ridge core CON01-603-5

Cite as:

Swann, George; Mackay, Anson; Leng, Melanie; Demory, Francois (2006): δ13C(organic), C/N mass ratios and %TOC for Continent Ridge core CON01-603-5. Deutsches GeoForschungsZentrum GFZ. https://doi.org/10.1594/GFZ.SDDB.1053

Status

I N R E V I E W : Swann, George; Mackay, Anson; Leng, Melanie; Demory, Francois (2006): δ13C(organic), C/N mass ratios and %TOC for Continent Ridge core CON01-603-5. Deutsches GeoForschungsZentrum GFZ. https://doi.org/10.1594/GFZ.SDDB.1053

Abstract

C/N mass ratios remain constant throughout MIS 3 and into MIS 2, with values between 6.3 and 8.9, indicating no significant terrestrial input of organic matter (Fig. 3). Low %TOC values during the interstadial increase from 0.4 to 0.7 between 57.8 and 43.7 kyr BP with a concurrent gradual increase in δ13C(organic) amid oscillations between −23.2‰ and −26.1‰ (Fig. 3). %TOC falls to 0.4 between 40.9 and 39.4 kyr BP whereas δ13C(organic) remains high at c. 24‰ with a peak value of −23.6‰ at 39.4 kyr BP. The subsequent two-stage increase in %TOC from 39 to 37.9 kyr BP and between 37.3 and 36.9 kyr BP is marked by a period of δ13C(organic) lowering to c. −26.6‰ before δ13C(organic) increases after 37.9 kyr BP to −24.8‰, values comparable to those prior to the %TOC decline at 40.9 kyr BP.