三塘湖盆地黄土山-克孜勒塔格地区哈尔加乌组火山岩构造环境及时代判别

Tectonic Environment and Age Discrimination of Haljiawu Formation Volcanic rock in Huangtushan-Keziletage Area in Santanghu Basin

通过三塘湖盆地黄土山-克孜勒塔格地区哈尔加乌组火山岩类型、成因特点及区域构造背景,探讨其岩石学和地球化学特征。结果显示火山岩属正常火山岩类型。演化过程为碰撞造山中增厚的岩石圈根部拆沉作用使得软流圈地幔上涌底侵,导致早期陆壳组分熔融引起火山喷发,形成晚古生代后碰撞期火山岩。据生物化石、岩性特征及同位素数据,推断哈尔加乌组为二叠纪火山活动产物。

Bstract： By exploring the volcanic rock types,formation characteristics and the regional tectonic setting of the Halji-awu formation in Santanghu basin,Huangtushan-keziletage area,prove the Volcanic rocks is normal volcanic rock types. The evolutionary process is thickened lithosphere root delamination resulting in the asthenosphere upwelling in the man-tle underplating during collision orogeny,and resulting in volcanic eruptions by partial melting of the arc components, formed a post-collisional volcanic rocks of Late Paleozoic.By fossils,lithological characteristics and isotopic data results to determine,the Haljiawu formation was product of Permian volcanic activity.