GEOMORPHOLOGY AND STRATIGRAPHIC FRAMEWORK OF THE YAP SUBDUCTION ZONE, WESTERN PACIFIC
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摘要:
2015年中科院海洋所在西太平洋雅浦海域首次开展了综合地球物理调查，并同步采集了重磁震及多波束、浅地层剖面等数据，主要利用采集的多道地震剖面及多波束数据研究了雅浦俯冲带主要构造单元的地貌及沉积地层结构特征，并进一步探讨了加罗林洋脊俯冲作用下的构造特征。研究表明弧后的帕里西维拉盆地为区域沉积中心，最厚处可能发育近千米沉积层，而雅浦海沟内未发育明显水平沉积，以俯冲侵蚀作用为主；加罗林俯冲板片之上的加罗林洋脊因其特殊的地形地貌改造了俯冲带的构造发育特征，可能造成了岛弧岩浆作用的南、北部差异；揭示了雅浦海沟北段的地貌及地质结构细节特征，认为加罗林洋脊的高地形可能导致了海沟附近的俯冲板片更大的挠曲拉张量，从而形成垒堑构造带；为索罗尔海槽的盆地张裂结构提供了多道地震剖面证据，并推测了海槽的形成年代。
Abstract:The Institute of Oceanology under the Chinese Academy of Sciences conducted an integrated geophysical survey in the sea area near the Yap Island, western Pacific in 2015, including surveys of gravity, magnetism, seismics, multi-beam and sub-bottom profiles. Multichannel seismic and multi-beam data are mainly used to investigate the topography of major tectonic units and the stratigraphic framework in the Yap subduction zone as well as the tectonic characteristics of ridge subduction. Data suggests that the Parece Vela Basin, as the regional depositional center, is filled with young sediments for nearly 1000 meters. On the contrast, the horizontal depositional layers are hardly identified in the trench, where subduction erosion dominates. The Caroline ridge changed the tectonic characteristics of subduction zone, and influenced magmatism in the Yap arc due to its specific topography. The topography and geological structure of horst and graben in the north Yap are depicted in details. The topographic high of the Caroline ridge is supposed to bring greater bending and tension and favor the formation of the subsequent horst and graben belt. Multichannel seismic evidence has been used for interpreting the expansion of the Sorol Trough and its inferred age.
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Key words:
- multichannel seismic /
- multi-beam /
- the Yap trench /
- Caroline sea /
- Sorol Trough
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表 1 多道地震采集参数
Table 1. Parameters of the multichannel seismic acquisition
气枪总容积/in3 震源工作压力/psi 道间距/m 接收电缆道数 放炮间距/m 记录长度/s 1 300 2 000 12.5 120 50 12 
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