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新疆北部阿尔泰地区库尔提蛇绿岩:古弧后盆地系统的产物
Kuerti Ophiolite in Altay Area of North Xinjiang:Magmatism of an Ancient Back_arc Basin
  修订日期:2001-04-18
中文关键词:弧后盆地 蛇绿岩 岛弧 古亚洲洋 新疆
英文关键词:back-arc basin,ophiolite,island arc,Paleoasia Ocean,Xinjiang
基金项目:国家305项目专题(96-915-01-01)资助
作者单位
许继峰  
陈繁荣  
于学元  
牛贺才  
郑作平  
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中文摘要:
      位于新疆北部富蕴县库尔提一带的晚古生代变质玄武岩和辉长岩系含有似岛弧火山岩(arc-like)和似洋中脊玄武岩(MORB-like)成分的两种组分,岩石以出现不同程度的LREE亏损和Nb、Ta等元素的负异常为特征,在成分上非常相似于现代弧后盆地(Mariana和Okinawa弧后盆地)的玄武岩。我们厘定这套变质的镁铁质火成岩为弧后盆地蛇绿岩,它们很可能代表了晚古生代古亚洲洋北侧的一个洋内岛弧的弧后盆地系统,表明晚古生代早期新疆北部地区处于与古亚洲洋俯冲有关的岛弧环境,该古洋在晚石炭世-二叠纪消减消失后,两侧西伯利亚和哈萨克-准噶尔板块才开始碰撞和造山。
英文摘要:
      The Late Paleozoic meta_basalts and gabbros exposed in Kuerti area of north Xinjiang are characterized by LREE depletion of different degrees and Nb, Ta negative anomalies, suggesting that they contain both MORB_like and arc-like components. The compositional characters of these meta_basalts and gabbros are much similar to those of the typical back-arc basin basalts (BABB) (e.g., Mariana and Okinawa BABBs). Therefore, they are presently determined to be of Kuerti BAB-ophiolite, most probably representing a crust part of the intraocean back-arc basin produced by subduction of the Paleoasia ocean. Recognition of the Kuerti BAB_ophiolite implies that the north Xinjiang area was an ancient subduction zone in early Late Paleozoic. A Paleoasia Ocean separated Siberian plate from Kazakhstan-Junggar continental plate at that time. The collision between the two continental plates and the subsequent orogeny in this area most likely took place after the disappearance of Paleoasia ocean in Carboniferous-Permian period.
许继峰,陈繁荣,于学元,牛贺才,郑作平,2001,新疆北部阿尔泰地区库尔提蛇绿岩:古弧后盆地系统的产物[J].岩石矿物学杂志,20(3):344~352.
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