白培荣,马德胜,符宏斌,曾禹人,吴滔.西藏当雄县九子拉地区侏罗纪盆地演化特征浅析[J].贵州地质,2015,32(3):216-221 |
西藏当雄县九子拉地区侏罗纪盆地演化特征浅析 |
Analyses on Evolution Characteristics of Jurassic Basin in Jiuzila Area of Dangxiong,Tibet |
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DOI: |
中文关键词: 班公湖—怒江洋 九子拉地区 弧后扩张 沉积盆地 侏罗纪 西藏 |
英文关键词:Bangonghu-Nujiangyang Jiuzila area Back-arc expansion Sedimentary basin Jurassic Tibet |
基金项目: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) |
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中文摘要: |
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。 |
英文摘要: |
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. |
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