新疆科古琴山晚石炭世火山岩及其地质意义

Upper Carboniferous Volcanic Rock and its Geological Significance of Keguqin Mountain in Xinjiang

分布于新疆中天山西段科古琴山一带的中酸性火山岩,是晚石炭世构造-岩浆喷发活动的产物,反映该区一次重要的构造-火山地质事件。对其岩石及地球化学特征研究表明,该火山喷发活动形成于活动陆缘构造环境,具有大陆裂谷火山岩系和岛弧火山岩双重特征,属较为典型"滞后型"弧火山岩。

The intermediate acidity volcanic rock which spread in west Keguqin mountain of middle Tianshan mountain in Xinjiang, is the outcome of upper carboniferous structure - magma effusion, it reflect an important structure- volcano geologic event in this area. In the study for its rock and geochemical character, it shows that the volcano effusion event formed in active continental margin structure environment, has double character of continental rift volcanic sequence and island arc volcanic sequence, is the typical lag arc volcanic rock.