其大地构造环境为大陆裂谷带。

The tectonic environment suggests a continental rift zone.

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由于盆地长期处于相对稳定的大地构造环境，这就为油气的生成、聚集、保存提供了有利的地质条件。

As it has long been in relatively stable tectonic setting, it provides the favourable geologic conditions for oil-gas generation, accumulation and preservation.

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本文阐述了该火山洼地形成的历史背景、大地构造环境、形成时地壳运动的特点及与成矿作用的关系。

This paper elucidates the historical setting, the geotecto- hie environment, the features of the crustal movement and their relation to mineralization during the formation of the volcano—tectonic.

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