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在1:5万区域地质调查工作中,对新疆北部萨吾尔山主脊花岗闪长岩采用激光ICP—MS技术进行锆石U-Pb年龄的测定,结果表明,岩浆侵位结晶年龄为(320±2)Ma,时代相当于晚石炭世;其中有(342±3)Ma、(354±2)Ma的捕获锆石。岩体岩石学、岩石化学、地球化学特征表明萨吾尔山花岗岩具岩浆混合作用特征,其形成可能与古亚洲洋闭合造山后的岩石圈伸展体制有关,即形成于后碰撞阶段的挤压—伸展转变期。
In the 1: 50000 regional geological survey, zircon ICP-MS technique was used to determine zircon U-Pb age of the main ridge granodiorite in the northern part of the Xinjiang Uygur Autonomous Region. The results show that the magmatic emplacement crystallization age is (320 ± 2) Ma, the age is equivalent to the Late Carboniferous; there are (342 ± 3) Ma, (354 ± 2) Ma captured zircon. The petrological, petrochemical and geochemical characteristics of the rock mass indicate that the magmatism of the Uighur granite is characterized by magmatic mixing, which may be related to the lithospheric extension system after the closure of the Paleo-Asian Ocean, that is, the extrusion- Stretch transition period.