1.陕西师范大学地理科学与旅游学院,陕西 西安 710119
2.西北大学城市与环境学院,陕西 西安 710127
黄瑞琪(2000年生),女;研究方向:环境演变;E-mail:ruiqi_huang@snnu.edu.cn
庞奖励(1963年生),男;研究方向:环境演变;E-mail:jlpang@snnu.edu.cn
收稿:2026-03-08,
修回:2026-05-03,
录用:2026-05-22,
网络首发:2026-07-03,
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黄瑞琪, 庞奖励, 周亚利, 等. 玛曲谷地柯生村黄土-古土壤序列化学风化程度及气候意义[J/OL]. 中山大学学报(自然科学版)(中英文), 2026,1-11.
Huang Ruiqi, Pang Jiangli, Zhou Yali, et al. Chemical weathering intensity and climatic implications of the Kesheng Villag loess-paleosol profile, Maqu Valley, Zoige Basin[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-11.
黄瑞琪, 庞奖励, 周亚利, 等. 玛曲谷地柯生村黄土-古土壤序列化学风化程度及气候意义[J/OL]. 中山大学学报(自然科学版)(中英文), 2026,1-11. DOI: 10.11714/acta.snus.ZR20260058.
Huang Ruiqi, Pang Jiangli, Zhou Yali, et al. Chemical weathering intensity and climatic implications of the Kesheng Villag loess-paleosol profile, Maqu Valley, Zoige Basin[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-11. DOI: 10.11714/acta.snus.ZR20260058.
若尔盖盆地是青藏高原东北部典型的地貌单元,对气候波动响应敏感,广泛分布的连续风成沉积物记录了该地区地表过程及气候变化的重要信息。本研究以玛曲谷地黄河二级阶地柯生村(KSC)黄土-古土壤序列为研究对象,通过对元素地球化学特征进行分析,结合微形态观察与光释光(OSL)测年,尝试重建剖面的化学风化演变历史,以揭示13.2 ka以来区域气候的阶段性变化。结果表明:1)黄河二级阶地于13.2 ka前后开始受到稳定风尘堆积,形成了连续完整的黄土-古土壤地层序列,自下而上依次为黄土L
1
(13.2~8.5 ka)、古土壤S
0
(8.5~3.0 ka)、黄土L
0
(3.0~1.2 ka)、现代土壤MS(1.2 ka至今);2)KSC剖面整体处于初等化学风化阶段[化学蚀变指数(CIA)平均值为59.8],不同地层单元化学风化强度有所不同,古土壤虽强于黄土,但仍属于初等风化水平,剖面风化强度序列为:古土壤S
0
(CIA均值62.3)
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1.52400005
2.28600001
黄土MS
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2.28600001
L
0
(CIA均值61.6)
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1.52400005
2.28600001
黄土L
1
(CIA均值56.4);3)13.2 ka以来,区域气候经历了冷干(13.2~8.5 ka)、暖湿(8.5~3.0 ka)、冷干(3.0 ka至今)的阶段性演化,1.2 ka以来发育了现代土壤MS。本研究可为若尔盖盆地地表过程演变及气候变化的深入理解提供风积物证据。
The Zoige Basin, located on the northeastern Qinghai-Tibet Plateau, is a geomorphic unit highly sensitive to climate change. Widespread continuous aeolian deposits in this region provide valuable insights into regional surface processes and climate changes. This study investigated the loess-paleosol sequence at Kesheng Village (KSC) on the second terrace of the Yellow River in the Maqu Valley. Based on geochemical elemental analysis, micromorphological observation, and optically stimulated luminescence (OSL) dating, we reconstructed the chemical weathering history of the profile and revealed the phased climatic evolution since 13.2 ka. The results indicate that: 1) Stable aeolian dust accumulation commenced on the second terrace of the Yellow River at around 13.2 ka, forming a continuous and complete loess-paleosol sequence. From bottom to top, this sequence comprises loess L
1
(13.2~8.5 ka), paleosol S
0
(8.5~3.0 ka), loess L
0
(3.0~1.2 ka), and modern soil MS (1.2 ka to present). 2) The KSC profile is generally in the initial stage of chemical weathering (mean CIA=59.8). Although the paleosol exhibits higher weathering intensity than the loess units, it remains within the initial weathering stage. The weathering intensity follows the order: paleosol S
0
(mean CIA=62.3)
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1.77800000
2.62466669
loess MS
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https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=112095274&type=
1.77800000
2.62466669
L
0
(mean CIA=61.6)
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1.77800000
2.62466669
loess L
1
(mean CIA=56.4). 3) Since 13.2 ka, the regional climate has undergone a phased evolution from cold-dry (13.2~8.5 ka) to warm-humid (8.5~3.0 ka) and back to cold-dry (3.0 ka to present), with modern soil MS developing since 1.2 ka. This study provides new aeolian evidence for understanding surface process evolution and climate change in the Zoige Basin.
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