Does Eolian Flux to the Northwest Pacific Ocean Reflect Persistent Asian Interior Aridity on Orbital Timescales?

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-01-24 DOI:10.1029/2024gl112599

Qiang Zhang, Andrew P. Roberts, Zhengquan Yao, Xuefa Shi, Qingzhen Hao, Lixia Ju, Xu Tang, Jianxing Liu, Shuangchi Liu, Qingsong Liu

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引用次数: 0

Abstract

Northwest Pacific sedimentary eolian dust flux records have long been used to make direct inferences about Asian interior aridity. However, factors other than aridity can impact dust production rate. We present here an integrated environmental magnetic, electron microscopic, sedimentologic, and geochemical investigation of eolian dust records from Northwest Pacific Ocean Drilling Program Hole 1207A between 1.0 and 1.5 Ma. Reconstructed fluxes of bulk eolian dust and illite, the predominant clay mineral (>72% proportion), are both higher and lower during glacials and interglacials, respectively. Lower illite chemical index values reflect stronger physical weathering during glacials. We attribute eolian flux peaks to increased availability of wind-erodible particles caused by enhanced physical weathering in dust source areas due to strengthened Asian interior glacial activity in response to glacial cooling. This evidence demonstrates that Northwest Pacific eolian flux does not only reflect persistent Asian interior aridity on orbital timescales.

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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.