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, tempera...

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Autores principales:	Jeremy McCormack, Ola Kwiecien
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/650581b7e3c84dafbe2579a8b1bde2fe
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spelling	oai:doaj.org-article:650581b7e3c84dafbe2579a8b1bde2fe2021-12-02T14:27:56ZCoeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations10.1038/s41598-021-86872-12045-2322https://doaj.org/article/650581b7e3c84dafbe2579a8b1bde2fe2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86872-1https://doaj.org/toc/2045-2322Abstract 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 valves; and post-depositional phases: (3) dolomite forming in the sediment, and previously overlooked, (4) aragonite encrustations formed rapidly around decaying organic matter. We find a systematic relation between the lithology and the dominant deep-water carbonate phase formed recurrently under specific hydrological conditions. The presence of the different carbonates is never mutually exclusive, and the isotopic composition of each phase forms a distinctive cluster characteristic for the depth and timing of their formation. Our findings stretch the envelope of mechanisms forming lacustrine carbonates and highlight the urge to identify and separate carbonate components prior to geochemical analyses.Jeremy McCormackOla KwiecienNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jeremy McCormack Ola Kwiecien Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
description	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 valves; and post-depositional phases: (3) dolomite forming in the sediment, and previously overlooked, (4) aragonite encrustations formed rapidly around decaying organic matter. We find a systematic relation between the lithology and the dominant deep-water carbonate phase formed recurrently under specific hydrological conditions. The presence of the different carbonates is never mutually exclusive, and the isotopic composition of each phase forms a distinctive cluster characteristic for the depth and timing of their formation. Our findings stretch the envelope of mechanisms forming lacustrine carbonates and highlight the urge to identify and separate carbonate components prior to geochemical analyses.
format	article
author	Jeremy McCormack Ola Kwiecien
author_facet	Jeremy McCormack Ola Kwiecien
author_sort	Jeremy McCormack
title	Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
title_short	Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
title_full	Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
title_fullStr	Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
title_full_unstemmed	Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
title_sort	coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/650581b7e3c84dafbe2579a8b1bde2fe
work_keys_str_mv	AT jeremymccormack coevalprimaryanddiageneticcarbonatesinlacustrinesedimentschallengepalaeoclimateinterpretations AT olakwiecien coevalprimaryanddiageneticcarbonatesinlacustrinesedimentschallengepalaeoclimateinterpretations
_version_	1718391256296456192

Coeval primary and diagenetic carbonates in lacustrine sediments challenge palaeoclimate interpretations

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