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The δ13C, δ18O and Δ47 records in biogenic, pedogenic and geogenic carbonate types from paleosol-loess sequence and their paleoenvironmental meaning
Quaternary Research ( IF 2.3 ) Pub Date : 2021-01-22 , DOI: 10.1017/qua.2020.109
Kazem Zamanian , Alex R. Lechler , Andrew J. Schauer , Yakov Kuzyakov , Katharine W. Huntington

Paleoenvironmental reconstructions are commonly based on isotopic signatures of a variety of carbonate types, including rhizoliths and land-snail shells, present in paleosol-loess sequences. However, various carbonate types are formed through distinct biotic and abiotic processes over various periods, and therefore may record diverging environmental information in the same sedimentological layer. Here, we investigate the effects of carbonate type on δ13C, δ18O, and clumped isotope-derived paleotemperature [T(Δ47)] from the Quaternary Nussloch paleosol-loess sequence (Rhine Valley, SW Germany). δ13C, δ18O, and T(Δ47) values of co-occurring rhizoliths (-8.2‰ to -5.8‰, -6.1‰ to -5.9‰, 12–32°C, respectively), loess dolls (-7.0‰, -5.6‰, 23°C), land-snail shells (-8.1‰ to -3.2‰, -4.0‰ to -2.2‰, 12–38°C), earthworm biospheroliths (-11‰, -4.7‰, 8°C), and “bulk” carbonates (-1.9‰ to -0.5‰, -5.6‰ to -5.3‰, 78–120°C) from three sediment layers depend systematically on the carbonate type, admixture from geogenic carbonate, and the duration of formation periods. Based on these findings, we provide a comprehensive summary for the application of the three isotopic proxies of δ13C, δ18O, and Δ47 in biogenic and pedogenic carbonates present in the same sediment layer to reconstruct paleoenvironments (e.g., local vegetation, evaporative conditions, and temperature). We conclude that bulk carbonates in Nussloch loess should be excluded from paleoenvironmental reconstructions. Instead, pedogenic and biogenic carbonates should be used to provide context for interpreting the isotopic signature for detailed site- and time-specific paleoenvironmental information.

中文翻译:

古土壤-黄土层序中生物、成土和地质碳酸盐类型的δ13C、δ18O和Δ47记录及其古环境意义

古环境重建通常基于古土壤-黄土序列中存在的各种碳酸盐类型的同位素特征,包括根岩和蜗牛壳。然而,各种碳酸盐类型是通过不同时期不同的生物和非生物过程形成的,因此可能在同一沉积层中记录不同的环境信息。在这里,我们研究了碳酸盐类型对 δ13C, δ18O 和聚集同位素衍生的古温度 [T(Δ47)] 来自第四纪 Nussloch 古土壤-黄土序列(德国西南部莱茵河谷)。δ13C, δ18O, 和 T(Δ47) 共生根石值(分别为-8.2‰ 至 -5.8‰、-6.1‰ 至 -5.9‰、12-32°C)、黄土娃娃(-7.0‰、-5.6‰、23°C)、土地- 蜗牛壳(-8.1‰ 至 -3.2‰,-4.0‰ 至 -2.2‰,12–38°C),蚯蚓生物球石(-11‰,-4.7‰,8°C)和“散装”碳酸盐(-三个沉积层的 1.9‰ 至 -0.5‰、-5.6‰ 至 -5.3‰、78–120°C)系统地取决于碳酸盐类型、地质碳酸盐的混合物以及形成期的持续时间。基于这些发现,我们对 δ 的三种同位素替代物的应用进行了全面总结。13C, δ18O, 和 Δ47存在于同一沉积层中的生物成因和成土碳酸盐,以重建古环境(例如,当地植被、蒸发条件和温度)。我们得出结论,应将 Nussloch 黄土中的块状碳酸盐排除在古环境重建之外。相反,应该使用成土和生物碳酸盐来提供解释同位素特征的背景,以获取详细的地点和时间特定的古环境信息。
更新日期:2021-01-22
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