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横穿中央海盆断裂带以南的西菲律宾海盆所作的长距离旁侧声纳扫描图(S wathmap)上。可以看到一些线状深海山,这些海山与称之为中央海盆断裂带的原扩张中心平行或近乎平行。离中央海盆断裂带最远的、较老的海山平行于该断裂带;而靠断裂带的海山则平行于该断裂带内部的构造。菲律宾海盆早期海底扩张的方向为北东—南西向。在距今大约54百万年前,其扩张方向改为近南北向,这可能与澳大利亚开始北移有关。
Across the long-range side sonar scan (S wathmap) from the western Philippine basin south of the Central Basin fault zone. Some of the linear deep-sea mountains can be seen, which are parallel or near parallel to the original expansion center known as the Central Basin fracture zone. The oldest sea seam farthest from the central basin fault zone is parallel to the fault zone; seamounts adjacent to the fault zone are parallel to the internal structure of the fault zone. The direction of the early seabed expansion in the Philippine basin is North-East-South West. About 54 million years ago, the direction of its expansion was changed to be near North-South, which may be related to the beginning of Australia’s northward move.