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.