Browsing by Author "Pooja Tiwari"
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PublicationArticle Presence and implications of petrogenic organic carbon in High Himalayan Crystalline lake sediment(Cambridge University Press, 2024) Priyanka Singh; Vijayananda Sarangi; Ravi Bhushan; S Nawaz Ali; Shailesh Agrawal; Pooja Tiwari; Masud Kawsar; Prasanta Sanyal; Kamlesh Kumar; Biswajeet Thakur; M.C. Manoj; Veerukant Singh; Ankur Dabhi; Anupam Sharma; Kuldeep Prakash; P. MorthekaiTwelve lacustrine sediment samples from a relict lake in the Kalla Glacier valley were co-dated using AMS radiocarbon (14C) 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 (OCancient) that is a mixture of pre-aged (OCpre-aged) and petrogenic (OCpetro) 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 OCpetro in all the profile samples. The OCpetro contributed 0.064 ± 0.032% to the sediment and the lake stored 2.5 ± 0.7 Gg OCpetro at variable rates during the last 16 kyr, with the mean burial flux 160 kg OCpetro 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 OCpetro as many such small lakes become relict in this region. © The Author(s), 2024. Published by Cambridge University Press on behalf of University of Arizona.PublicationConference Paper The 37th International Geological Congress: ‘The great travelers: voyages to the unifying earth’(Indian Academy of Sciences, 2025) Deveshwar Prakash Mishra; Pooja Tiwari; Piyal Halder; Nidhi Tomar; Suraj K. Sahu; R. S. Negi; Abhishek Pandey[No abstract available]