中国黄土高原关中盆地全新世风化黄土-页岩断面的风化与成土作用

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Asian Earth Sciences Pub Date : 2024-09-16 DOI:10.1016/j.jseaes.2024.106334
Yan Zhu , Yuzhu Zhang , Ninglian Wang , Shuheng Li , Menglei Wu , Yanfeng Li , Jianxi Li , Jiangli Pang , Yao Jin , Dou Chen , Qili Xiao , Pengpeng Cao , Mengting Li , Jinpeng Zhou , Jiahui Wang , Shodmonov Anvar Akramovich
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引用次数: 0

摘要

中国黄土高原(CLP)的风化黄土-页岩剖面是阐明第四纪冰川-间冰期东亚季风(EAM)动态的宝贵档案。本研究对中国华北平原关中盆地全新世风化黄土-页岩剖面进行了细致的研究,以评估风化和成土的强度,并揭示其对古气候的影响。通过对化学元素组成和微观形态的综合分析,发现全新世风化黄土-古沉积剖面的大部分地层单元表现出弱风化和成土迹象,而全新世中期古沉积则接近中度风化和成土。从层次上看,地层单元之间的风化和成土强度可划分为:古沉积> 表土> 新近黄土> 过渡黄土。此外,全新世中期古沉积的化学蚀变指数(CIA)值呈现出由东南向西北梯度下降的趋势,与东亚夏季季风(EASM)主要影响下的现今温度和降水分布相一致。因此可以推断,在全新世中期气候最适宜时期,东亚夏季季候风对古沉积物的风化和成土作用非常明显。这些结果对探索全新世风化和成土过程以及中山公园的古环境演变具有重要意义。
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Weathering and pedogenesis of the Holocene aeolian loess-paleosol sections in the Guanzhong Basin on the Chinese Loess Plateau
The aeolian loess-paleosol sections on the Chinese Loess Plateau (CLP) represent invaluable archives for elucidating the dynamics of the East Asian Monsoon (EAM) across Quaternary glacial-interglacial cycles. In this study, a Holocene aeolian loess-paleosol section in the Guanzhong Basin on the CLP was meticulously investigated to assess the intensity of weathering and pedogenesis, and to discern its paleoclimatic implications. Through comprehensive analysis of chemical element composition and micromorphology, it was revealed that the majority of stratigraphic units within the Holocene aeolian loess-paleosol section exhibit indications of weak weathering and pedogenesis, while the mid-Holocene paleosol approaches to moderate weathering and pedogenesis. Hierarchically, the intensity of weathering and pedogenesis among the stratigraphic units can be ranked as follows: paleosol > topsoil > recent loess > transitional loess. Furthermore, the chemical index of alteration (CIA) values of the mid-Holocene paleosol exhibit a gradient decline from southeast to northwest, aligning with present-day temperature and precipitation distributions under the predominant influence of the East Asian summer Monsoon (EASM). Thus, it can be inferred that the robust impact of the EASM on weathering and pedogenesis of paleosol was pronounced during the mid-Holocene Climatic Optimum. These results are of significance in exploring the Holocene weathering and pedogenesis and paleoenvironmental evolution on the CLP.
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来源期刊
Journal of Asian Earth Sciences
Journal of Asian Earth Sciences 地学-地球科学综合
CiteScore
5.90
自引率
10.00%
发文量
324
审稿时长
71 days
期刊介绍: Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance. The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.
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