当前位置：
X-MOL 学术
›
Chem. Geol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Clumped and stable isotopes of land snail shells on the Chinese Loess Plateau and their climatic implications
Chemical Geology ( IF 3.6 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.chemgeo.2019.119414 Jibao Dong , John Eiler , Zhisheng An , Naiqin Wu , Weiguo Liu , Xiangzhong Li , Nami Kitchen , Fengyan Lu
Chemical Geology ( IF 3.6 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.chemgeo.2019.119414 Jibao Dong , John Eiler , Zhisheng An , Naiqin Wu , Weiguo Liu , Xiangzhong Li , Nami Kitchen , Fengyan Lu
Abstract We report stable (δ13Cshell, δ18Oshell) and clumped isotope (Δ47) compositions of modern and last glacial fossil snail shell carbonates from the Luochuan and Weinan sections on the central and southern Chinese Loess Plateau (CLP). Our study reveals that the average Δ47 temperature (T47) of modern snails is consistent with monitored temperatures during the snail growing season at the studied locations and is ~10 °C higher than that of fossil snails from glacial time. Moreover, the average δ13Cshell of modern snails is more depleted than that of fossils. We argue that the δ13Cshell cannot record changes in plant communities (i.e., the C3/C4 ratio) on the CLP and may mainly indicate arid conditions with depleted values reflecting reduced aridity. Additionally, the reconstructed snail body water δ18O (δ18Owater) of modern snails is more enriched than δ18O in modern growing season precipitation and δ18Owater of fossils. This contrast may be related to the high degree of evaporative enrichment of environmental water 18O in the body/ingested by modern snails under warm conditions. Therefore, we suggest that using δ18Oshell to directly reconstruct the oxygen isotopes of precipitation is difficult and that higher δ18Oshell and δ18Owater values probably indicate higher environmental temperature/stronger evaporative enrichment on glacial-interglacial timescales on the CLP.
更新日期：2020-02-01
京公网安备 11010802027423号