Implications of the loess record for Holocene climate and human settlement in Heye Catchment, Jiuzhaigou, eastern Tibetan Plateau, Sichuan, China
Implications of the loess record for Holocene climate and human settlement in Heye Catchment, Jiuzhaigou, eastern Tibetan Plateau, Sichuan, China
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DOI：
10.1017/qua.2022.44
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发表时间：
2022-10
影响因子：
2.3
通讯作者：
A. Schmidt;B. Collins;A. Keen-Zebert;Jade d’Alpoim Guedes;Anke Hein;Andrew Womack;C. McGuire;
中科院分区：
文献类型：
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作者：
A. Schmidt;B. Collins;A. Keen-Zebert;Jade d’Alpoim Guedes;Anke Hein;Andrew Womack;C. McGuire;
摘要我们研究了青藏高原（TP）和中国黄土高原（CLP）边缘的荷叶流域的全新世黄土记录，以确定：荷叶流域气候更相似的区域;风强度的时间变化;质量浪费和人类活动对黄土记录的修改。释光和放射性碳测年表明黄土沉积时代为>11- 8.6ka和<5.1ka两个时期。8.6-5.1 ka的沉积间断与中全新世气候适宜期相吻合，更类似于TP的黄土沉积停止，而不是CLP的黄土沉积减速。粒度分析表明，荷叶黄土是至少三种不同粒度分布的混合物，它可能来自多个来源。较老的黄土中粗沉积物的比例较大，可能表明与最近的沉积时期相比，风更强。砾石纳入年轻的黄土最有可能来自基岩暴露在崩落陡崖。人类居住的集水区，最早的证据是3.4 ka，滞后于开始的滑坡，因此，滑坡可能创造了一个适合人类居住的环境。
Abstract We examine the Holocene loess record in the Heye Catchment on the margins of the Tibetan Plateau (TP) and China Loess Plateau (CLP) to determine: the region to which the Heye Catchment climate is more similar; temporal change in wind strength; and modification of the loess record by mass wasting and human activity. Luminescence and radiocarbon dating demonstrate loess deposited in two periods: >11–8.6 ka and <5.1 ka. The 8.6–5.1 ka depositional hiatus, which coincides with the Mid-Holocene Climatic Optimum, is more similar to the loess deposition cessation in the TP than to the loess deposition deceleration in the CLP. Grain-size analysis suggests the Heye loess is a mixture of at least three different grain-size distributions and that it may derive from multiple sources. A greater proportion of coarse sediments in the older loess may indicate stronger winds compared with the more recent depositional period. Gravel incorporated into younger loess most likely comes from bedrock exposed in slump scarps. Human occupation of the catchment, for which the earliest evidence is 3.4 ka, postdates the onset of slumping; thus the slumps may have created a livable environment for humans.