A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution

Eolian dust deposited in the North Pacific is an important archive of the evolutionary history of Asian interior source regions and climate system. Here, we present a ∼1 Myr sediment magnetic record from the central North Pacific to characterize eolian dust properties since the middle Pleistocene. F...

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Autores principales:	Ji Young Shin, Kiseong Hyeong, Wonnyon Kim
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	eolian dust north pacific magnetic minerals mid-pleistocene transition dust source Science Q
Acceso en línea:	https://doaj.org/article/82875c0aa2ab4189b27fb3883e5a2e67
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spelling	oai:doaj.org-article:82875c0aa2ab4189b27fb3883e5a2e672021-11-16T12:00:16ZA Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution2296-646310.3389/feart.2021.789584https://doaj.org/article/82875c0aa2ab4189b27fb3883e5a2e672021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.789584/fullhttps://doaj.org/toc/2296-6463Eolian dust deposited in the North Pacific is an important archive of the evolutionary history of Asian interior source regions and climate system. Here, we present a ∼1 Myr sediment magnetic record from the central North Pacific to characterize eolian dust properties since the middle Pleistocene. For the studied sediments, magnetic components are mainly identified as biogenic magnetite and detrital magnetic minerals (dust and volcanic origins) based on coercivity analysis, microscopic observations, and sedimentological information. The detrital magnetic component is characterized by high coercivity (>100 mT) and shows a long-term increase in concentration since ∼1 Ma. In particular, the concentration shows a considerable increase at ∼0.8–0.7 Ma compared to the inorganic silicate fraction, indicative of magnetic mineral enrichment in detrital sediment fraction. At the same time, the coercivity distribution of the detrital component also decreases, which can be attributed to an increase in the ferrimagnetic mineral contribution. As the detrital sediments are primarily wind-blown particles, such ferrimagnetic enrichment implies a change in dust source materials after ∼0.8 Ma, which could be explained by the reorganization of atmospheric circulation and/or regional aridification in source regions across the mid-Pleistocene transition. The dust property change in source areas is likely to be synchronized across the North Pacific based on the similarity of the long-term trend of magnetic signals.Ji Young ShinJi Young ShinKiseong HyeongWonnyon KimFrontiers Media S.A.articleeolian dustnorth pacificmagnetic mineralsmid-pleistocene transitiondust sourceScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	eolian dust north pacific magnetic minerals mid-pleistocene transition dust source Science Q
spellingShingle	eolian dust north pacific magnetic minerals mid-pleistocene transition dust source Science Q Ji Young Shin Ji Young Shin Kiseong Hyeong Wonnyon Kim A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
description	Eolian dust deposited in the North Pacific is an important archive of the evolutionary history of Asian interior source regions and climate system. Here, we present a ∼1 Myr sediment magnetic record from the central North Pacific to characterize eolian dust properties since the middle Pleistocene. For the studied sediments, magnetic components are mainly identified as biogenic magnetite and detrital magnetic minerals (dust and volcanic origins) based on coercivity analysis, microscopic observations, and sedimentological information. The detrital magnetic component is characterized by high coercivity (>100 mT) and shows a long-term increase in concentration since ∼1 Ma. In particular, the concentration shows a considerable increase at ∼0.8–0.7 Ma compared to the inorganic silicate fraction, indicative of magnetic mineral enrichment in detrital sediment fraction. At the same time, the coercivity distribution of the detrital component also decreases, which can be attributed to an increase in the ferrimagnetic mineral contribution. As the detrital sediments are primarily wind-blown particles, such ferrimagnetic enrichment implies a change in dust source materials after ∼0.8 Ma, which could be explained by the reorganization of atmospheric circulation and/or regional aridification in source regions across the mid-Pleistocene transition. The dust property change in source areas is likely to be synchronized across the North Pacific based on the similarity of the long-term trend of magnetic signals.
format	article
author	Ji Young Shin Ji Young Shin Kiseong Hyeong Wonnyon Kim
author_facet	Ji Young Shin Ji Young Shin Kiseong Hyeong Wonnyon Kim
author_sort	Ji Young Shin
title	A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
title_short	A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
title_full	A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
title_fullStr	A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
title_full_unstemmed	A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution
title_sort	sediment magnetic record in the north pacific across the mid-pleistocene transition and its implication on asian dust evolution
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/82875c0aa2ab4189b27fb3883e5a2e67
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A Sediment Magnetic Record in the North Pacific Across the Mid-Pleistocene Transition and its Implication on Asian Dust Evolution

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