Sources of Tsunami Deposits on the Pacific Coasts of Iwate, Miyagi, and Fukushima Areas by the 2011 off the Pacific Coast of Tohoku Earthquake, Northeast Japan Inferred from Geochemical Signatures (TOC/TN Ratio and Stable Sulfur Isotope)

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  • 東北地方太平洋沖地震による岩手，宮城，福島県沿岸域における津波堆積物の供給源
  • 東北地方太平洋沖地震による岩手,宮城,福島県沿岸域における津波堆積物の供給源 : TOC/TN比および安定硫黄同位体(δ³⁴S)を指標として
  • トウホク チホウ タイヘイヨウオキ ジシン ニ ヨル イワテ,ミヤギ,フクシマケン エンガンイキ ニ オケル ツナミ タイセキブツ ノ キョウキュウ ゲン : TOC/TNヒ オヨビ アンテイ イオウ ドウイタイ(d ³ ⁴ S)オ シヒョウ ト シテ
  • Sources of tsunami deposits on the Pacific coasts of Iwate, Miyagi, and Fukushima areas by the 2011 off the Pacific coast of Tohoku Earthquake, Northeast Japan inferred from geochemical signatures (TOC/TN ration and stable sulfur isotope)
  • ―TOC/TN比および安定硫黄同位体（δ<sup>34</sup>S）を指標として―

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Abstract

 Geochemical analyses (total nitrogen: TN, total organic carbon: TOC, total sulfur: TS, and stable sulfur isotope ratio: δ34S) were performed on tsunami deposits by the 2011 off the Pacific coast of Tohoku Earthquake obtained from Iwate, Minamisanriku, Kesen-numa, and Sendai Bay areas for a total of 133 samples. Although TOC/TN ratios ranged widely (0.7–90), most of the samples (more than 80% of samples) ranged from 10–30, which were similar results to those for marine surface sediment in the Pacific coast area. Low δ34S values (from -29.6‰ to -11.3‰) from Iwate, Minami Sanriku, and Sendai Bay tsunami deposits were observed. Generally, such low δ34S values result from large isotope fractionation caused by the activity of sulfate-reducing bacteria in marine sediment under a sulfate (SO42-) rich environment. These results suggest that the tsunami deposits were mainly derived from marine sediment. High correlations between TS and As contents (r=0.958) were observed in tsunami deposits from the Kesen-numa area. Furthermore, the high δ34S values (from -3.1‰ to -0.7‰) in the tsunami deposits from the Kesen-numa area correspond well with those of hydrothermal ore samples from the Kesen-numa area. These results indicate that sulfur and arsenic in tsunami deposits from the Kesen-numa area originated in slag from the mines.

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