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Geochemical records of tectono-climatic environmental changes in 14C-dated peats from Ziro Valley of Eastern Himalaya, Arunachal Pradesh, India

Authors
  • Das, Avijit1
  • Choudhury, Arpita Roy1
  • Das, Anindya1
  • 1 Geological Survey of India, 15 A & B Kyd Street, Kolkata, 700016, India , Kolkata (India)
Type
Published Article
Journal
Arabian Journal of Geosciences
Publisher
Springer-Verlag
Publication Date
Jan 31, 2022
Volume
15
Issue
3
Identifiers
DOI: 10.1007/s12517-022-09560-y
Source
Springer Nature
Keywords
Disciplines
  • Original Paper
License
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Abstract

Geochemical proxies have been employed in this study to assess the vegetation, hydrology and atmospheric dust changes in 14C-dated, high-altitude, tropical peats of Eastern Himalaya in Ziro Valley for new insight into the region’s past tectono-environmental changes. Peat geochemistry at seven sampled locations was studied by comparing the depth profile of the ash content, molar Ca/ Mg ratio, Sr and Al (conservative lithogenic element) against the 14C-dated ages of peat sections in a sequence. The trophic status of the peat from the seven locations indicated the presence of both ombrotrophic and mineratrophic peats. The age-depth profile of peat from two locations showed that geochemical changes due to fluvial accumulation resulting in high mineral-rich ash content occurred around the time of the Last Glacial Maxima, about 25 ka ago. Atmospheric Pb deposition in the peat archives of Ziro was also assessed from the variation of Pb and Pb/Sc ratio in the depth-age plots. The δ13C values of the peat sections from the seven locations in this study ranged from -26.56 to -28.01‰ and it indicated a dominance of the C-3 plants around 42 ka.

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