Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations.

ABSTRACT: Lakes are sensitive to climate change and their sediments play a pivotal role as environmental recorders. The oxygen and carbon isotope composition (δ¹⁸O and δ¹³C) of carbonates from alkaline lakes is featured in numerous studies attempting a quantitative reconstruction of rainfall, temperature and precipitation-evaporation changes. An often-overlooked challenge consists in the mineralogically mixed nature of carbonates themselves. We document a large variability of carbonate components and their respective distinct δ¹⁸O and δ¹³C values from sediments of Lake Van (Turkey) covering the last 150 kyr. The carbonate inventory consists of primary (1) inorganic calcite and aragonite precipitating in the surface-water, (2) biogenic calcite ostracod valv

SUBMITTER: McCormack J 

PROVIDER: S-EPMC8041749 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature