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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Characteristics of the typical loess profile with a macroscopic tephra layer in the northeast China and the paleoclimatic significance
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Characteristics of the typical loess profile with a macroscopic tephra layer in the northeast China and the paleoclimatic significance

机译：典型黄土概况与东北地区宏观Tephra层的特点及古纤维素意义

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摘要

Tephra layers can serve as ideal datable horizons to provide invaluable datums for supplementing research on loess-paleosol sequences. The objective of this research was to evaluate a typical loess profile interbedded with a macroscopic tephra in northeastern China to better understand its formation to determine the potential impact of volcanism on climate change, as evidenced by loess pedogenesis. Geochemical and physical properties of the profile were determined and compared with loess materials from other areas to address its characteristics and potential significance for understanding climate variability. Results showed the tephra layers with overlying loess horizons were uniform in parent material, as inferred from evidence such as uniform Ti/Zr ratios with depth, similar rare earth element distribution patterns, and major elemental distributions with depth. The volcanic properties in the bottom of the profile, including morphology, high phosphate adsorption capacity (PAC) and pH (NaF) values, further supported the speculation that the depositions of aeolian dust and volcanic materials were synchronous with pedogenic processes. According to the comparison of magnetic susceptibility of the typical profile with the global delta O-18 curve, the local paleoclimate showed an increase in temperature in warmth and wetness, which may have been affected by volcanism. Research on the loess profile interbedded with a macroscopic tephra could improve our knowledge of loess formation and deepen our understanding of the impact of volcanism on climate changes.
机译：火山灰层可以作为理想的数据库层位，为补充黄土-古土壤序列研究提供宝贵的数据。本研究的目的是评估一个典型的黄土剖面，该剖面与中国东北部的宏观火山灰层互层，以更好地了解其形成，从而确定火山作用对气候变化的潜在影响，黄土成土作用证明了这一点。测定了剖面的地球化学和物理性质，并与其他地区的黄土材料进行了比较，以探讨其特征以及对理解气候变化的潜在意义。结果表明，根据Ti/Zr比值随深度的变化、稀土元素分布模式的相似性以及主要元素随深度的分布等证据推断，覆盖黄土层的火山灰层在母材中是均匀的。剖面底部的火山特征，包括形态、高磷酸盐吸附能力（PAC）和pH（NaF）值，进一步支持了风成尘埃和火山物质的沉积与土壤形成过程同步的推测。根据典型剖面的磁化率与全球delta O-18曲线的比较，当地古气候显示温暖和湿润的温度升高，这可能受到火山作用的影响。研究黄土剖面与宏观火山灰层的互层可以提高我们对黄土形成的认识，加深我们对火山作用对气候变化影响的理解。

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