巴丹吉林沙漠腹地盐湖碳酸盐同位素特征及其环境意义

doi:10.12118/j.issn.1000-6060.2024.288

干旱区地理 ›› 2025, Vol. 48 ›› Issue (2): 247-256.doi: 10.12118/j.issn.1000-6060.2024.288 cstr: 32274.14.ALG2024288

巴丹吉林沙漠腹地盐湖碳酸盐同位素特征及其环境意义

李全聪¹^,²(), 雷国良¹^,²^,³(), 赵晖⁴, 朱芸¹^,²^,³, 孙婉婷¹^,², 于源¹^,², 江戈平¹^,²

1.福建师范大学湿润亚热带生态-地理过程教育部重点实验室，福建福州 350117
2.福建师范大学地理科学学院/碳中和未来技术学院，福建福州 350117
3.福建师范大学地理研究所，福建福州 350117
4.中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室，甘肃兰州 730000

收稿日期:2024-05-09 修回日期:2024-10-12 出版日期:2025-02-25 发布日期:2025-02-25
通讯作者: 雷国良（1981-），男，博士，副研究员，主要从事地貌过程与环境演变、环境地球化学研究. E-mail: leiguoliang@fjnu.edu.cn
作者简介:李全聪（1998-），男，硕士研究生，主要从事全球变化与第四纪研究. E-mail: qsx20221051@student.fjnu.edu.cn
基金资助:
国家自然科学基金青年科学基金(41977390);第二次青藏高原综合科学考察研究(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);福建师范大学地理研究所公益类科研院所专项(2024R1002005)

Isotopic characteristics of carbonate in salt lakes in the hinterland of Badain Jaran Desert and its environmental significance

LI Quancong¹^,²(), LEI Guoliang¹^,²^,³(), ZHAO Hui⁴, ZHU Yun¹^,²^,³, SUN Wanting¹^,², YU Yuan¹^,², JIANG Geping¹^,²

1. Key Laboratory of Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350117, Fujian, China
2. School of Geographical Science and School of Carbon Neutrality Future Technology, Fujian Normal University, Fuzhou 350117, Fujian, China
3. Institute of Geography, Fujian Normal University, Fuzhou 350117, Fujian, China
4. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

Received:2024-05-09 Revised:2024-10-12 Published:2025-02-25 Online:2025-02-25

摘要/Abstract

摘要：

湖泊碳酸盐的形成与湖水物理化学性质以及气候环境密切相关，是记录湖泊环境信息的重要载体。以巴丹吉林沙漠腹地6个湖泊中2种类型的碳酸盐（钙华、湖泊沉积物碳酸盐）为研究对象，基于稳定碳、氧以及团簇同位素（Δ₄₇）指标，对比分析了2种碳酸盐的沉淀过程及其所揭示的环境信息。研究表明：（1）巴丹吉林沙漠6个湖泊中钙华与沉积物2种碳酸盐的碳、氧同位素特征显著不同，钙华沉积的氧同位素显著较湖泊沉积物碳酸盐偏负。（2）湖泊沉积物碳酸盐的团簇同位素温度[T(Δ₄₇)]与区域夏季温度接近；而钙华碳酸盐的T(Δ₄₇)低于湖泊沉积物碳酸盐。（3）基于氧同位素和T(Δ₄₇)估算的碳酸盐沉淀水体δ¹⁸O显示，形成钙华碳酸盐的水体δ¹⁸O记录了泉水与湖水混合的信号。研究结果初步揭示了巴丹吉林沙漠腹地盐湖碳酸盐的环境指示意义，为长时间尺度上揭示沙漠湖泊的水文演化提供了数据支撑。

关键词: 湖泊沉积物碳酸盐, 钙华, 团簇同位素, 巴丹吉林沙漠

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 Badain Jaran Desert, Inner Mongolia, China. The precipitation processes of these carbonates and their environmental implications were analyzed using stable carbon, oxygen, and clumped isotope (Δ₄₇) indices. The results indicate 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 suggests 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.

Key words: lake sediment carbonate, tufa, clumped isotope, Badain Jaran Desert

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.

LI Quancong, LEI Guoliang, ZHAO Hui, ZHU Yun, SUN Wanting, YU Yuan, JIANG Geping. Isotopic characteristics of carbonate in salt lakes in the hinterland of Badain Jaran Desert and its environmental significance[J]. Arid Land Geography, 2025, 48(2): 247-256.

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湖泊名称	经度/°E	纬度/°N	面积/km²	湖水pH值	地下水pH值	湖泊最大深度/m	水化学类型
呼都格吉林	102.37^[20]	39.82^[20]	0.43^[20]	9.63	7.11^[26]	6.30^[24]	Na-CO₃-Cl^[27]
呼和吉林	102.46^[20]	39.88^[20]	0.93^[20]	9.50	7.68^[28]	12.20^[24]	Na-CO₃-Cl^[27]
必鲁图	102.49^[20]	39.84^[20]	0.33^[20]	9.48	-	-	Na-CO₃-Cl^[27]
布尔特	102.27^[20]	39.84^[20]	0.24^[20]	9.61	9.19^[29]	-	Na-CO₃-Cl^[27]
苏木吉林	102.43^[20]	39.81^[20]	0.62^[20]	9.57	7.80^[23]	5.80^[24]	Na-CO₃-Cl^[27]
车日格勒	102.25^[20]	39.89^[20]	1.06^[20]	9.52	7.93^[26]	8.00^[24]	Na-CO₃-Cl^[27]

碳酸盐类型	湖泊名称	样品编号	测试加样量/mg	δ¹³C/‰	δ¹⁸O/‰	Δ₄₇/‰	Δ₄₇±1SE/‰	T(Δ₄₇)/℃	T(Δ₄₇)±1SE/℃	N
钙华	呼都格吉林	HDGJL-T	15	-7.81	-3.68	0.726	0.007	17.5	1.9	3
	呼和吉林	HHJL-T	15	-2.71	-1.53	0.725	0.002	17.7	0.6	3
	必鲁图	BLT-T	20	-1.54	-0.91	0.713	0.012	21.2	3.3	3
	布尔特	BET-T	15	0.45	-1.21	0.713	0.010	21.2	2.9	8
	苏木吉林	SMJL-T	20	-0.15	-0.45	0.714	0.011	20.8	3.1	7
	车日格勒	CRGL-T	12	1.68	-0.86	0.710	0.005	22.0	1.5	3
湖泊沉积物碳酸盐	呼都格吉林	HDGJL-S	77	-2.24	-1.42	0.672	0.005	33.9	1.6	4
	呼和吉林	HHJL-S	80	-0.38	-0.64	0.688	0.006	28.7	1.9	3
	必鲁图	BLT-S	65	-0.75	-0.18	0.686	0.023	29.3	7.0	3
	布尔特	BET-S	70	0.57	-0.16	0.697	0.015	25.9	4.5	4
	苏木吉林	SMJL-S	70	-1.41	0.47	0.697	0.007	25.8	2.2	3
	车日格勒	CRGL-S	95	-0.70	-0.65	0.704	0.005	23.8	1.5	4

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

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