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Late Quaternary climate change in the northeastern Arabian Peninsula recorded in the oxygen isotope composition of carbonate cements of aeolianites

Published online by Cambridge University Press:  12 February 2026

Sruthi Padampath Sreenivasan*
Affiliation:
Department of Earth Sciences, Khalifa University, Abu Dhabi, United Arab Emirates
Thomas Steuber
Affiliation:
Department of Earth Sciences, Khalifa University, Abu Dhabi, United Arab Emirates
Mohammad Alsuwaidi
Affiliation:
Research and Innovation Center on CO2 and Hydrogen (RICH), Department of Earth Sciences, Khalifa University, United Arab Emirates
Michael Wiedenbeck
Affiliation:
GFZ German Research Centre for Geosciences, Potsdam, Germany
Ikfi Maasyi Hanif
Affiliation:
Department of Earth Sciences, Khalifa University, Abu Dhabi, United Arab Emirates
Khaled Mohamed
Affiliation:
Department of Earth Sciences, Khalifa University, Abu Dhabi, United Arab Emirates UAE Ministry of Energy and Infrastructure, Abu Dhabi, United Arab Emirates
*
Corresponding author: Sruthi Padampath Sreenivasan; Email: sruthi.sreenivasan@ku.ac.ae

Abstract

The northeastern Arabian Peninsula has an extreme arid climate. To establish past variations in precipitation intensity during the late Quaternary, the oxygen isotope ratios (δ18O) of meteoric calcite cements of the late Quaternary aeolianites of the Ghayathi Formation in Abu Dhabi and Dubai have been analysed. The Ghayathi Formation is a carbonate-rich aeolianite, stabilised by calcite cement precipitated from rising groundwater during humid intervals. The calcite cements are well developed inside and outside a thin micrite rim of now hollow grains, formed by leaching of unstable carbonate grains. The δ18O values of cement analysed in thin sections by secondary ion mass spectrometry vary from −9.1‰ (VPDB) in coastal to +12.7‰ (VPDB) inland areas. This exceptionally wide range of the otherwise petrographically uniform aeolianite is due to the contrasts in humidity and evaporation rate between the coastal and inland areas. The δ18O values as low as −9.1‰ suggest intense precipitation in the late Quaternary, possibly due to the northward expansion of the intertropical convergence zone and intensified Indian summer monsoon. The exceptionally high values must be due to intense evaporation at low humidity in low-salinity, playa-type environments during intermittent arid intervals.

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Type
Research Article
Copyright
© The Author(s), 2026. Published by Cambridge University Press on behalf of Quaternary Research Center.

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