现今的西太平洋边缘海、沟弧盆体系，是新生代中晚期太平洋板块、澳大利亚板块与欧亚板块相互作用形成的。

The current marginal sea and trench-arc-basin system of west Pacific is reformed by interaction of Pacific plate, Australian plate, and Eurasia plate in Cenozoic.

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结合上述事实，通过沉积建造分析，该区在中石炭统曾存在沟弧盆体系。

The analysis of sedimentary formation suggests the existence of groove-arc-basin system at the middle Carboniferous.

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早奥陶世北祁连地区再次拉张，遭受第二次大洋化，到中奥陶世形成具沟弧盆体系的成熟大洋。

In early Ordovician North Qilian region again stretched and suffered second oceanization, up to middle Ordovician a mature ocean basin with a trough-arc-basin system already formed.

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