干旱区地理2025，Vol.48Issue(2)：247-256,10.DOI:10.12118/j.issn.1000-6060.2024.288
巴丹吉林沙漠腹地盐湖碳酸盐同位素特征及其环境意义
Isotopic characteristics of carbonate in salt lakes in the hinterland of Badain Jaran Desert and its environmental significance
摘要
Abstract
The formation of lake carbonate is closely associated with the physical and chemical properties of lake water and the climatic environment,serving as an essential carrier of lake environmental information.This study examines two types of carbonates(tufa and lake sediment carbonate)from six lakes in the hinterland of the Ba-dain Jaran Desert,Inner Mongolia,China.The precipitation processes of these carbonates and their environmen-tal implications were analyzed using stable carbon,oxygen,and clumped isotope(Δ47)indices.The results indi-cate the following:(1)The carbon and oxygen isotope characteristics of tufas and lake sediment carbonates from the six lakes differ significantly,with the oxygen isotope values of tufa deposits being notably more negative than those of lake sediment carbonates.(2)The clumped isotope temperatures[T(Δ47)]of lake sediment carbonates are consistent and approximate the regional summer temperature,whereas the T(Δ47)of tufas are lower.(3)Based on oxygen isotope values and T(Δ47),the estimated δ18O composition of the water in which the tufas precipitated sug-gests that the tufas capture a mixed signal from spring water and lake water.These findings provide preliminary insights into the environmental significance of salt lake carbonates in the hinterland of the Badain Jaran Desert and offer data to support long-term investigations into the hydrological evolution of desert lakes.关键词
湖泊沉积物碳酸盐/钙华/团簇同位素/巴丹吉林沙漠Key words
lake sediment carbonate/tufa/clumped isotope/Badain Jaran Desert引用本文复制引用
李全聪,雷国良,赵晖,朱芸,孙婉婷,于源,江戈平..巴丹吉林沙漠腹地盐湖碳酸盐同位素特征及其环境意义[J].干旱区地理,2025,48(2):247-256,10.基金项目
国家自然科学基金青年科学基金(41977390) （41977390）
第二次青藏高原综合科学考察研究(2019QZKK0202) （2019QZKK0202）
云南省高原地理过程与环境变化重点实验开放基金项目(PGPEC201801) （PGPEC201801）
福建师范大学地理研究所公益类科研院所专项(2024R1002005)资助 （2024R1002005）
