Rapid hydroclimate fluctuation in eastern China coastal plain restrain Neolithic cultures development: A mineral magnetic study
Rapid hydroclimate fluctuation in eastern China coastal plain restrain Neolithic cultures development: A mineral magnetic study
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DOI：
10.1016/j.catena.2023.107442
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发表时间：
2023-12
期刊：
影响因子：
6.2
通讯作者：
Yinglu Chen;Weiguo Zhang;Qianli Sun;Y. Liu;I. Snowball;B. Almqvist;Chenyao Yan;Huimin Wang
中科院分区：
文献类型：
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作者：
Yinglu Chen;Weiguo Zhang;Qianli Sun;Y. Liu;I. Snowball;B. Almqvist;Chenyao Yan;Huimin Wang
位于杭州湾平原南部、中国东部的瑶江流域是新石器时代文化的发源地，这些文化可以追溯到公元8世纪。沿海平原上因应海平面和水文气候变化而重建的古代人类文化已被很好地记录下来。然而，百年分辨率的地质记录仍然缺乏。本文采用环境(矿物)磁学、地球化学和漫反射光谱(DRS)相结合的方法，对YJ1503沉积岩芯自全新世早期以来滨海平原百年来的水文气候波动进行了研究。结果表明，亚铁磁性云母和顺磁性黄铁矿含层对应于地下水位较高的还原时期，而反铁磁性赤铁矿/针铁矿的存在对应于有利于土壤形成的较干燥时期。8.2兆卡冷却事件和7.5-6.6兆卡BP前后磁性矿物学的百年尺度波动反映了频繁和不稳定的环境，新石器时代的占领有限。大约在6.0千卡BP左右发生了一次强烈的干旱事件，在此之前，研究区发生了一次大范围的海洋洪水事件。这一洪水事件中断了水稻种植。我们的研究表明，磁性矿物学可以用来重建滨海平原和泛滥平原环境中的高分辨率水文过程。这些结果对于了解环境敏感地区的水文气候变化和新石器时代文明响应具有重要意义。
The Yaojiang Valley (YJV) on the southern Hangzhou Bay Plain, eastern China, was home to Neolithic cultures that date back to 8 ka. Reconstructions of ancient human cultures on the coastal plain in response to sea-level and hydroclimate changes have been well documented. However, centennial-resolution geological records are still lacking. Here, we present a combined approach of environmental (mineral) magnetism, geochemistry and diffuse reflectance spectroscopy (DRS) on a sediment core (YJ1503) in YJV to decipher the centennial hydroclimate oscillations of the coastal plain since early Holocene. Our results show that ferrimagnetic greigite and paramagnetic pyrite bearing layers correspond to periods of reducing condition that were caused by a higher water table while the presence of antiferromagnetic hematite/goethite corresponds to drier periods favorable for soil formation. Centennial scale fluctuations of magnetic mineralogy around the 8.2 ka cooling event and 7.5–6.6 cal ka BP reflect frequent and unstable environments, with limited Neolithic occupation. A strong drought event occurred around 6.0 cal ka BP, which was preceded by an extensive marine inundation event in the study area. This inundation event interrupted rice farming. Our study indicates that magnetic mineralogy can be used to reconstruct high-resolution hydrological processes in coastal plain and floodplain environments. These results are important to understand hydroclimate variation and Neolithic civilization response in environmentally sensitive areas.