Magmatism and tectonic setting of proto-Japan during the Early Carboniferous: Constraints from the geochemical characteristics of mafic volcanic rocks in the Hida Gaien Belt, SW Japan

Shimura, Yusuke; Tsukada, Kazuhiro; Yamamoto, Koshi; Nadmid, Bayart

doi:10.1016/j.jseaes.2022.105312

Cited by 1 publication

(2 citation statements)

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“…The total Fe-to-Al ratios increase up to two times higher than those from soils as the total Al concentrations decrease (Figure S2). The volcanic activity could be a possible natural source for the increased total Fe-to-Al ratios, as shown in volcanic rocks in Japan (0.93 ± 0.31). , However, we discount the volcanic activity as a major source based on the periodicity of volcanic eruptions (3 events) and the air mass transport patterns during the events (Figure S3). We also rule out the possible contribution of biomass burning since it hardly changes total Fe-to-Al ratios. , In a previous study conducted around the study region, it was suggested that the anthropogenic Fe could contribute to the total Fe pool up to 50% of fine and 21% of bulk aerosol based on Fe isotopes .…”

Section: Resultsmentioning

confidence: 99%

“…The volcanic activity could be a possible natural source for the increased total Fe-to-Al ratios, as shown in volcanic rocks in Japan (0.93 ± 0.31). 52,53 However, we discount the volcanic activity as a major source based on the periodicity of volcanic eruptions (3 events) and the air mass transport patterns during the events (Figure S3). 50 We also rule out the possible contribution of biomass burning since it hardly changes total Fe-to-Al ratios.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Anthropogenic Iron Invasion into the Ocean: Results from the East Sea (Japan Sea)

Seo

Kim

2023

Environ. Sci. Technol.

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Iron (Fe) is an essential micronutrient for phytoplankton growth, and its availability limits primary production in half of the global ocean. Traditionally, atmospheric input of natural mineral dust has been considered as a main source of Fe in the surface ocean. However, here we show that about 45% of the water-soluble Fe in aerosols collected over the East Sea (Japan Sea) is anthropogenic, which originates mainly from heavy fuel oil combustion, based on the analyses of various chemical tracers (Al, K, V, Ni, Pb, and 210 Pb). It is striking that a tiny quantity of oil, less than 1% of the aerosols in mass, can constitute the majority of water-soluble Fe in aerosols due to its high Fe solubility. Furthermore, we show that a quarter of dissolved Fe in the East Sea is anthropogenic using a 210 Pb-based scavenging model. Since this sea is almost fully enclosed (200−3000 m) and located at the forefront of the Asian human footprint, our results provide an insight that the marine Fe cycle may be already perturbed by human activities.

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