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Presence and implications of petrogenic organic carbon in High Himalayan Crystalline lake sediment

Published online by Cambridge University Press:  26 September 2024

Priyanka Singh*
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India Centre of Advanced Study, Department of Geology, Banaras Hindu University, Varanasi – 221 005, India Indian Institute of Geomagnetism, New Panvel, Navi Mumbai – 410218, India
Vijayananda Sarangi
Affiliation:
Department of Earth Sciences, Indian Institute of Science Education and Research, Kolkata – 741 246, India Department of Soil and Environment, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden
Ravi Bhushan
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad – 380 009, India
S Nawaz Ali
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Shailesh Agrawal
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Pooja Tiwari
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Masud Kawsar
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Rajesh Agnihotri
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Prasanta Sanyal
Affiliation:
Department of Earth Sciences, Indian Institute of Science Education and Research, Kolkata – 741 246, India
Kamlesh Kumar
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Biswajeet Thakur
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
M C Manoj
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Veerukant Singh
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Ankur Dabhi
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad – 380 009, India
Anupam Sharma
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
Kuldeep Prakash
Affiliation:
Centre of Advanced Study, Department of Geology, Banaras Hindu University, Varanasi – 221 005, India
P Morthekai
Affiliation:
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007, India
*
Corresponding author: Priyanka Singh; Email: [email protected]

Abstract

Twelve 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.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of University of Arizona

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Deceased.

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