李羿芃, 丁林, 刘德亮, Oimahmadov Ilhomjon, Mustafo Gadoev, Negmat Rajabov, 李顺. 帕米尔高原沙克达拉穹窿变质作用及新生代下地壳演化[J]. 地质科学, 2013, 48(2): 468-483. doi: 10.3969/j.issn.0563-5020.2013.02.010
引用本文: 李羿芃, 丁林, 刘德亮, Oimahmadov Ilhomjon, Mustafo Gadoev, Negmat Rajabov, 李顺. 帕米尔高原沙克达拉穹窿变质作用及新生代下地壳演化[J]. 地质科学, 2013, 48(2): 468-483. doi: 10.3969/j.issn.0563-5020.2013.02.010
Li Yipeng, Ding Lin, Liu Deliang, Oimahmadov Ilhomjon, Mustafo Gadoev, Negmat Rajabov, Li Shun. The Cenozoic metamorphism and tectonic evolution of the lower crust of Shakhdara dome,Pamir Mountains[J]. Chinese Journal of Geology, 2013, 48(2): 468-483. doi: 10.3969/j.issn.0563-5020.2013.02.010
Citation: Li Yipeng, Ding Lin, Liu Deliang, Oimahmadov Ilhomjon, Mustafo Gadoev, Negmat Rajabov, Li Shun. The Cenozoic metamorphism and tectonic evolution of the lower crust of Shakhdara dome,Pamir Mountains[J]. Chinese Journal of Geology, 2013, 48(2): 468-483. doi: 10.3969/j.issn.0563-5020.2013.02.010




  • 中图分类号: P542,P588

The Cenozoic metamorphism and tectonic evolution of the lower crust of Shakhdara dome,Pamir Mountains

  • 帕米尔高原从西到东展布的8个新生代变质穹窿构成帕米尔高原变质地壳的主体,沙克达拉穹窿是其中最大的一个。沙克达拉穹窿变质杂岩中石榴矽线石片麻岩峰期组合(Grt+Ky+Bi+Rt+Pl+Qz)变质作用温压条件为T约810 ℃/P约10 kbar, 石榴石单斜辉石基性麻粒岩峰期组合(Grt+Cpx+Rt+Pl+Qz)变质作用温压条件为T约824 ℃/P约16.3 kbar, 榴闪岩退变较强,其残留峰期组合(Grt+Pl+Hbl+ilm+Qz)变质作用温压条件为T约683 ℃~873 ℃/P约8.6~11.7 kbar。基性麻粒岩变质锆石的U-Pb年龄为19~35 Ma,反映了从晚始新世到早中新世帕米尔高原下地壳加热加厚过程。帕米尔穹窿的变质作用可以与高喜马拉雅结晶岩系类比,在新生代印度亚洲大陆碰撞过程中,帕米尔陆内各地体沿前新生代缝合带的陆内俯冲可能是帕米尔下地壳加厚的主要动因。
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收稿日期:  2012-12-20
修回日期:  2013-01-08
刊出日期:  2013-04-25