摘要
在阿尔金构造带中段,首次在测区发现了新元古代末—早古生代初期石榴二辉橄榄岩和榴辉岩,在此基础上将前长城系原阿尔金群解体,并从其中解体出新太古代—古元古代中酸性变质古侵入体等;厘定出新元古代—早古生代早期阿尔金杂岩;鉴别并填绘出与板块俯冲-碰撞造山-后造山期伸展密切相关的奥陶纪阿南蛇绿构造混杂岩带和奥陶纪—泥盆纪阿尔金构造岩浆岩带;确定阿尔金断裂形成于白垩纪末,经历了主要4期变形。发现3个夷平面,计算出晚更新世以来测区隆升速度为1.58～1.8cm/a,上升逾460m。
Garnet lherzolite and eclogite of terminal Neoproterozoic-initial Early Paleozoic age have for the first time been found in the survey area in the central segment of the Altyn Tagh (Altun) tectonic belt. On that basis the original 'Altyn Tagh Group' of the pre-Changchengian System is disintegrated and Neo-archean-Paleoproterozoic meta-intermediate-acid intrusive rocks are divorced from the group and the Neoproterozoic-Early Paleozoic Altyn Tagh complex is defined. The Ordovician Anan ophiolitic tectonic mélange belt close related to plate subduction-collisional orogenic and post-orogenic extension and Ordovician-Devonian Altyn Tagh tectonomagmatic belt have been identified and mapped. It has been determined that the Altyn Tagh fault formed at the end of the Cretaceous and mainly underwent four phases of deformation. According to three planation surfaces, the rate of uplift of the survey area have been calculated to be 1.58-1.8 cm/a since the Late Pleistocene and the area has risen more than 460 m.
出处
《地质通报》
CAS
CSCD
北大核心
2004年第5期560-563,共4页
Geological Bulletin of China
基金
中国地质调查局青藏高原1:25万苏吾什杰幅(J45C002004)地调项目(编号:200013000148)成果。
关键词
苏吾什杰
高压超高压变质岩
阿尔金杂岩
阿南蛇绿构造混杂岩带
阿尔金断裂
Suwushijie
high-pressure and ultrahigh-pressure metamorphic rocks
Altyn Tagh complex
Anan ophiolite tectonic mélange belt
Altyn Tagh fault
