Dynamic Coupling Between Intensified Physical Erosion and Asian Dust Activity Under Late Cenozoic Global Cooling

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-11-10 DOI:10.1029/2024GL110717

Shuwen Wang, Jinbo Zan, Friedrich Heller, Xiaomin Fang, Xiaoming Liu

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Abstract

Distinguishing the independent contributions of tectonic denudation and climate-driven erosion on the production and supply of clastic materials of Chinese eolian deposits is important in understanding the dynamic links between global climate changes, tectonics, and Asian dust emission. Here, multi-proxy rock magnetic records of detrital fractions of Chinese eolian deposits since ∼6 Ma, combined with further comparison with dust accumulation rates and geochemical data, suggest that limited production and supply of clastic materials of Chinese eolian deposits were observed between 5.6 and 4.4 Ma in a warmer climate, and thereafter an increasing trend is evident during a cooler world. We propose that intense physical erosion under cooler conditions caused increasing production of fresh detrital components, exerting dominant influences on the sediment supply to Asian eolian deposits. This study provides direct evidence of dynamic coupling between intensified physical erosion and Asian dust activity under late Cenozoic global cooling.

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晚新生代全球变冷条件下物理侵蚀加剧与亚洲尘埃活动之间的动态耦合

区分构造剥蚀和气候驱动的侵蚀对中国岩溶沉积碎屑物质生产和供应的独立贡献，对于理解全球气候变化、构造和亚洲尘埃排放之间的动态联系非常重要。在此，通过对6Ma以下中国风积物碎屑岩的多代岩石磁性记录，并结合尘积率和地球化学数据的进一步对比，我们发现在5.6Ma至4.4Ma期间，气候较暖，中国风积物碎屑岩的生产和供应有限，而在此后的较冷时期，其生产和供应呈明显的增长趋势。我们认为，在较冷的条件下，强烈的物理侵蚀导致了新鲜碎屑成分的增加，对亚洲风化沉积的沉积物供应产生了主要影响。这项研究提供了直接证据，证明在晚新生代全球变冷条件下，物理侵蚀加剧与亚洲沙尘活动之间存在动态耦合。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.