2024/08/01 by Priyanka Singh, Vijayananda Sarangi, Ravi Bhushan +19 · 1 citation
Earth and Planetary Sciences · #Geochemistry and Elemental Analysis #Geology and Paleoclimatology Research #Geological formations and processes
paper · doi:10.1017/rdc.2024.87
Abstract Twelve lacustrine sediment samples from a relict lake in the Kalla Glacier valley were co-dated using AMS radiocarbon ( 14 C) and infrared stimulated luminescence (IRSL) dating methods. In general, the radiocarbon ages of bulk organic matter were older by a minimum of 1500 years compared to (age depth) modeled luminescence ages after fading corrections. This is observed for the first time in the lake sediments of High Himalayan Crystalline zone. A combination of lipid n -alkane data, Raman spectra and geochemical proxies suggested that this was due to ancient organic carbon (OC ancient ) that is a mixture of pre-aged (OC pre-aged ) and petrogenic (OC petro ) organic carbon within older glacial moraine debris that served as sediment source to the lake. Raman spectra suggest the presence of moderate to highly graphitized OC petro in all the profile samples. The OC petro contributed 0.064 ± 0.032% to the sediment and the lake stored 2.5 ± 0.7 Gg OC petro at variable rates during the last 16 kyr, with the mean burial flux 160 kg OC petro yr −1 . This study implies (1) employing another independent dating method in addition to radiocarbon method using bulk sediment organic matter, if the carbon content is low, to observe any discrepancy, and (2) a need to investigate on the fate of OC petro as many such small lakes become relict in this region.