摘要
处于班公湖—怒江—晶宁—孟连对接带南侧的九子拉区域,中-晚侏罗世,受北侧班公湖-怒江洋向南的持续俯冲,雅鲁藏布江弧后洋盆于早-中侏罗世向北低角度俯冲,在两者双向俯冲消减作用下,沿狮泉河-纳木错-嘉黎一线撕裂,造成该区弧后扩张,其间盆地经历了裂陷期→坳陷早期→主坳陷期→坳陷晚期沉积充填序列的演化过程,该区是冈底斯侏罗纪沉积盆地物质保存最完整的地区,对研究中生代冈底斯地质演化史分析具有较大意义。
In the Jiuzala area of south Bangonghu-Nujiang-Jingning-Menglian junction belt,Middle-late Jurassic experienced continued south direction subduction of north Bangonghu-Nujiangyang and low angle north subduction of Yarlung Zangbu back-arc basin. Under the subduction of two direction,Shiquanhe-Namucuo-Jiali belt laniated and caused the back-arc expanded in this area,the basin experienced the evolution process of chasmic stage-early depression period-main depression period-late depression period sedimentary sequence. This area is the most perfect area where Gangdise Jurassic basin material kept.
出处
《贵州地质》
2015年第3期216-221,共6页
Guizhou Geology
基金
西藏1:5万九子拉地区四幅区域地质调查(基[2011]03-02-15号)
西藏1:5万塔惹增地区四幅区域地质调查(基[2010]矿评02-02-07号)
