Limited warming of middle Miocene arid low-latitude climates: Application of clumped isotopes in sabkha environments
Marchegiano, Marta ， Ziegler, Martin ， Bialik, Or M. ， De Vleeschouwer, David
2025-12-01 GEOLOGY 2025 53(卷), 12(期), (null页)
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Reconstructing past climates in hot, arid regions is challenging due to scarce archives and proxies. Clumped isotopes (Delta 47) on sabkha calcite-aragonite minerals might alleviate this situation. We apply the Delta 47 technique to modern and middle Miocene sabkha samples yielding temperatures of 25.2 +/- 2.8 degrees C to 32.1 +/- 3.0 degrees C. Results show that sabkha calcite-aragonite minerals mainly reflect summer half-year temperatures, when most precipitation occurs. Reconstructed delta 18Owater (SMOW) (SMOW-standard mean ocean water) values (3.2 +/- 1.0%0 and 5.2 +/- 1.2%0) scale with the intensity of evaporation in these intertidal, supratidal, and lagoonal settings. Despite higher middle Miocene atmospheric CO2, reconstructed sabkha temperatures are similar to modern values, suggesting a low climate sensitivity. Thus, sabkha Delta 47 is a valuable tool for paleotemperature reconstructions in low-latitudes continental settings.
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