Crustal thickness variations of the Izu-Bonin-Mariana Arc and their implications for arc magmatism
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摘要:
数值模拟研究认为洋底高原/洋脊俯冲和弧后扩张能够有效影响俯冲带岩浆活动和岛弧地壳增生。本文以伊豆−博宁−马里亚纳（IBM）俯冲带为实例，论证该结论的有效性。以卫星测高反演重力异常为基础，通过构建地球不同圈层密度模型，反演得到IBM俯冲带莫霍面埋深。本文的莫霍面埋深反演结果与地震解释结果具有一致的分布趋势。结合开源水深和沉积层厚度数据，给出了IBM俯冲带地壳厚度分布。IBM岛弧地壳体积沿走向的分布特征表明：①小笠原洋底高原和相对较小规模达顿洋脊的俯冲，都能够使得相应位置的岛弧变窄、地壳变厚、体积增大；②马里亚纳海槽扩张显著降低了岛弧地壳体积的增生量。
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关键词:
- 伊豆−博宁−马里亚纳岛弧 /
- 重力反演 /
- 地壳厚度 /
- 弧后扩张 /
- 洋底高原/洋脊俯冲
Abstract:Numerical simulations suggest that plateau/ridge subduction and back-arc spreading would influence magmatism and island-arc crustal growth subduction-zone. In this paper, we take the Izu-Bonin-Mariana (IBM) subduction zone paper as a case to test the above observation. Moho depth variations are estimated based on Inversed gravity anomaly by satellite altimetry and density modelling for different layers, and the trend of the Moho inversion result can well match the seismic interpretations. Crustal thickness variations are mapped based on gravity-inversed Moho, open-source topography and bathymetry as well as sediment thickness. The island-arc crustal volume variations along strike indicate that (1) the subduction of the Ogasawara Plateau and the Dutton Ridge necked and thickened the arc crust, and they also increased the arc crust volume, (2) the opening of the Marian Trough reduced substantially the island-arc crustal growth.
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