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Lead concentration and isotopic composition in the Pacific sclerosponge (Acanthochaetetes wellsi) reflects environmental lead pollution

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/58018

Title: Lead concentration and isotopic composition in the Pacific sclerosponge (Acanthochaetetes wellsi) reflects environmental lead pollution
Authors: Ohmori, Kazuto Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Tanimizu, Masaharu Browse this author →KAKEN DB
Shirai, Kotaro Browse this author →KAKEN DB
Issue Date: Apr-2014
Publisher: Geological Society of America
Journal Title: Geology
Volume: 42
Issue: 4
Start Page: 287
End Page: 290
Publisher DOI: 10.1130/G34316.1
Abstract: We measured Pb/Ca and Pb isotopes with high resolution in the high-Mg calcite skeleton of a Pacific sclerosponge (Acanthochaetetes wellsi) collected from the reef edge off the western coast of Kume Island (East China Sea), to investigate its potential to he used as a proxy for lead contamination in the environment, and atmospheric transportation and fallout over the last few decades. Skeletal Pb/Ca ranged from 58 to 1642 nmol/mol, 10x higher than that of the aragonite skeleton of Pacific corals, and 2.5x higher than that of the aragonite skeletons of Caribbean sclerosponges. The Pb/Ca timeseries recorded from 1967 through 2007 CE correspond to historical changes in atmospheric lead flux in anthropogenic aerosols. Pb isotopes (Pb-206/Pb-207 and Pb-208/Pb-207) in the sclerosponge skeleton document that the main source of lead emissions shifted from Japan (1970-1980 CE) to China (1995-2005 CE), as expected from the timing of legislation against the use of leaded gasoline in Japan and China. Our results indicate that the skeleton of the Pacific sclerosponge is a powerful proxy to monitor environmental lead pollution. Applying this methodology to long-living and/or fossil specimens could be useful in determining the interannual variability of atmospheric transport and dynamics over geologic time scales.
Type: article (author version)
URI: http://hdl.handle.net/2115/58018
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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