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- 山本 伸次
- 東京工業大学大学院理工学研究科地球惑星科学専攻
書誌事項
- タイトル別名
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- Tectonic Erosion: New Perspectives on Pacific-type Orogeny and Continental Growth Models
- コウゾウ シンショク サヨウ タイヘイヨウガタ ゾウザン ウンドウロン ト タイリク セイチョウ モデル エ ノ シン シテン
- New Perspectives on Pacific-type Orogeny and Continental Growth Models
- ―太平洋型造山運動論と大陸成長モデルへの新視点―
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説明
This is a brief review of tectonic erosion originally proposed by von Huene and Scholl (1991) who have spent most of their academic careers studying marine geophysics along the circum-Pacific subduction zone.<br> Accretionary complex is considered to be formed by trench turbidite resting on the subducting oceanic plate that accretes against a hanging wall at a shallow or deep crustal level due to off-scraping or underplating. This concept was introduced to Japan in the early 1970s and was developed in great detail to propose a new paradigm for accretionary geology that involves ocean-plate stratigraphy. Later, identification of accretionary complex on-land in Japan became the mainstream. A new idea refutes the common occurrence of an on-going accretion process forming accretionary complexes along the circum-Pacific subduction zone. Instead, the concept of tectonic erosion has emerged to explain extensive crustal thinning and subsidence as an on-going process destroying the hanging wall of an older subduction complex or even the basement of the overriding plate at more than half of the active trench.<br> During the past three decades, marine geophysicists and geologists have documented tectonic erosion as a more common process than the formation of an accretional complex in subduction zones, and supeculate that a large volume of the continental crust is subducted into the mantle at both accretionary and erosive convergent margins. A simple calculation of the amount of subducting continental material versus arc producted at the subduction zone suggests a balance, resulting in no growth of continental crust at present (e.g. Clift and Vannuchi, 2004; Scholl and von Huene, 2007). However, considering direct subduction of intra-oceanic arcs and foundering of the continental lower crust into the mantle, we must conclude there is negative growth of the continental crust on the Earth at present.
収録刊行物
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- 地学雑誌
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地学雑誌 119 (6), 963-998, 2010
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390001204230813184
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- NII論文ID
- 10030370811
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 10979156
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- 本文言語コード
- ja
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- JaLC
- NDLサーチ
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