东南极普里兹湾地区花岗岩类的锆石U-Pb年龄、地球化学特征及其构造意义

李淼 刘晓春 赵越. 东南极普里兹湾地区花岗岩类的锆石U-Pb年龄、地球化学特征及其构造意义[J]. 岩石学报, 2007, 23(5): 1055-1066.
引用本文: 李淼 刘晓春 赵越. 东南极普里兹湾地区花岗岩类的锆石U-Pb年龄、地球化学特征及其构造意义[J]. 岩石学报, 2007, 23(5): 1055-1066.
LI Miao, LIU XiaoChun and ZHAO Yue. Zircon U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance.[J]. Acta Petrologica Sinica, 2007, 23(5): 1055-1066.
Citation: LI Miao, LIU XiaoChun and ZHAO Yue. Zircon U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance.[J]. Acta Petrologica Sinica, 2007, 23(5): 1055-1066.

东南极普里兹湾地区花岗岩类的锆石U-Pb年龄、地球化学特征及其构造意义

  • 基金项目:

    国家自然科学基金(40372046)和国土资源大调查项目(1212010511505)资助.致谢 野外工作得到任留东研究员、徐刚研究员的指导和大力协助,并提出重要的修改意见,在此深表感谢!

Zircon U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance.

  • 东南极普里兹湾地区出露大量泛非期花岗质岩类,利用IA-ICP-MS锆石U-Pb原位定年方法测得达尔克花岗岩、蒙罗克尔花岗岩和阿曼达花岗岩的年龄分别为519±2Ma,497±2Ma和498±7Ma.所有普里兹湾地区花岗岩类均具有较高的全碱含量以及K2O/Na2O、FeO^T/(FeO^T+MgO)和104Ga/Al比值,较低的Mg、Ca、Cr和Ni丰度,表现出A型花岗岩的特点,同时还富集大离子亲石元素和稀土元素,不同程度亏损Sr、Nb、Ta、P和Ti,并具有高87Sr/86Sr初始比值和低εNd(t)值的同位素特征.研究结果表明,普里兹湾地区的岩浆活动可能与后碰撞的造山作用有关,包括岩石圈减薄、岩浆底侵和地壳伸展作用等.普里兹湾A型后碰撞花岗岩的确定支持普里兹带为碰撞造山带的构造属性.
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修回日期:  2007-01-19
刊出日期:  2007-05-31

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