近日，德国明斯特大学David De Vleeschouwer团队报道了中新世中干旱低纬度气候的有限变暖：块状同位素在sabkha环境中的应用。该研究于2025年9月23日发表在《地质学》杂志上。

由于缺乏档案和代理资料，重建炎热干旱地区过去的气候是具有挑战性的。块状同位素(△₄₇) sabkha方解石-文石矿物可能会缓解这种情况。

研究组应用△₄₇现代和中新世中期sabkha样品的温度为25.2±2.8°C至32.1±3.0°C。结果表明，sabkha方解石文石矿物主要反映夏季半年温度，是降水最多的季节。重建的δ¹⁸O_{water（SMOW）}（SMOW - standard mean ocean water）值（3.2±1.0‰和5.2±1.2‰）与潮间带、潮上带和泻湖的蒸发强度呈正相关。尽管中新世中期大气CO₂较高，但重建的sabkha温度与现代值相似，表明气候敏感性较低。因此，sabkha △₄₇是在低纬度大陆环境中重建古温度的一个有价值的工具。

附：英文原文

Title: Limited warming of middle Miocene arid low-latitude climates: Application of clumped isotopes in sabkha environments

Author: Marta Marchegiano, Martin Ziegler, Or M. Bialik, David De Vleeschouwer

Issue&Volume: 2025-09-23

Abstract: Reconstructing past climates in hot, arid regions is challenging due to scarce archives and proxies. Clumped isotopes (47) on sabkha calcite-aragonite minerals might alleviate this situation. We apply the 47 technique to modern and middle Miocene sabkha samples yielding temperatures of 25.2 ± 2.8 °C to 32.1 ± 3.0 °C. Results show that sabkha calcite-aragonite minerals mainly reflect summer half-year temperatures, when most precipitation occurs. Reconstructed δ18Owater (SMOW) (SMOW—standard mean ocean water) values (3.2 ± 1.0‰ and 5.2 ± 1.2‰) 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 47 is a valuable tool for paleotemperature reconstructions in low-latitudes continental settings.

DOI: 10.1130/G53550.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G53550.1/661417/Limited-warming-of-middle-Miocene-arid-low