| 华北平原HS1钻孔第四纪冲洪积物地球化学特征及古气候意义 |
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| 关键词:geochemistry paleoclimate evolution Quaternary North China Plain ancient drainage system |
| 基金项目:河北省自然科学基金(编号: D2021504016);中国地质科学院水文地质环境地质研究所基本科研业务费项目(编号: SK202012) |
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| Geochemical Characteristics and Paleoenvironmental Significance of Quaternary Alluvial-pluvial Deposits in Borehole HS1 in the North China Plain |
| The paleoenvironmental changes and paleoclimate evolution were discussed based on the analysis of the content, correlation degree, and geochemical index of the major and trace elements in the sediments of the HS1 borehole in the North China Plain. The results demonstrated that since the Late Pliocene (3.50 Ma), the area surrounding the borehole HS1 has undergone eight climatic evolution stages: warm and humid, moderately humid, cold and slightly dry, cold and drought, moderately dry, moderately cool and humid, moderately dry, and warm and humid. The overall climatic tendency has changed from wet to dry, which is consistent with the pollen grain size and carbon-oxygen isotope records of borehole HS1. The results of the regional comparison revealed that geochemistry can be used as a better equivalent index for pollen to reconstruct climate change on a long-time scale and that climate change on a short-time scale is best recorded by high-resolution pollen. The entire area was in a weak oxidation sedimentary environment on the continental margin and the degree of chemical weathering in the quaternary period was weaker than that in the late Pliocene. The distinction in the geochemical element composition of alluvium in different geological periods of borehole HS1 primarily relied on its parent material source and transport distance. On the one hand, it was associated with the ancient water flow controlled by topography and geomorphology, primary tectonic adaptation, transformation zone, and secondary tectonic unit. On the other hand, it was related to the sedimentary environment, hydrodynamic conditions, chemical weathering, and soil formation influenced by climate change. |
| DONG Wang-gang,BI Zhi-wei,YANG Zhen-jing,XU Jian-ming,NING Kai.2023.Geochemical Characteristics and Paleoenvironmental Significance of Quaternary Alluvial-pluvial Deposits in Borehole HS1 in the North China Plain[J].Acta Geoscientica Sinica,44(6):1036-1052. |
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