| 講演要旨(和文) | | 土岐花崗岩の分布域を対象に空中電磁法調査を実施した。土岐花崗岩を不整合で覆っている瑞浪層群および瀬戸層群の比抵抗は数十Ωmであるのに対し、土岐花崗岩の比抵抗は健岩部で5000Ωm程度であり、そのコントラストは非常に大きい。従来の見掛比抵抗の計算方法では、このような大きなコントラストを正しく表現できないことが明らかになったので、新たに見掛比抵抗の計算方法を考案し、データの再処理を行った。その結果、瑞浪層群および瀬戸層群の層厚が薄く土岐花崗岩の深度が浅い部分と、両層群の層厚が厚く、土岐花崗岩の深度が深い部分を明瞭に区分することが出来た。 |
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| | 講演要旨(英文) | | An airborne electromagnetic survey was conducted in the region of the Toki granite. The resistivity of the Toki granite is about 5000ohm-m while the resistivity of the Mizunami Group and the Seto Group which overlie the Toki granite is tens of ohm-m. Due to processing limitation, this large contrast in resistivity was not included in past calculations of apparent resistivity. A new calculation method for apparent resistivity was developed, and data was reprocessed. As a result, the regions where the thickness of the Mizunami and/or the Seto Group is thin (the depth of the Toki granite is shallow) and the regions where the Toki granite is deep were clearly identified. |
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