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地质学报  2009 

北祁连榴辉岩相变沉积岩的特征及其构造意义

, PP. 1667-1686

Keywords: 北祁连,榴辉岩相变沉积岩,LAMCICPMS,Hf同位素,构造剥蚀

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Abstract:

在北祁连造山带中,出露典型的高压/低温变质岩石,前人对其中的低温榴辉岩已做过较多的研究,但对其中的变沉积岩研究涉及很少。本文展示了榴辉岩相变质沉积岩的岩石学、地球化学、锆石UPb年代学和Hf同位素方面的一些新的研究结果。变沉积岩含有榴辉岩相的矿物组合,峰期温压条件为?t?=450~520℃,?p?=?1.9?~2.3GPa,与相邻榴辉岩的温压条件一致。地球化学显示这些岩石的原岩为不成熟的沉积岩,可能形成于大陆边缘或大陆岛弧环境。变沉积岩中的碎屑锆石UPb年龄主要集中在1800Ma左右和540~600Ma之间,结合锆石Hf同位素特征,表明其原岩的碎屑来源既有周缘陆块的前寒武纪变质基底物质,又有新元古代―早古生代新生洋壳或增生物质。同时,这些数据也表明北祁连早古生代洋壳俯冲过程中发生了活动大陆边缘的构造剥蚀作用,即形成于上盘的沉积物(弧前盆地或增生楔)被构造作用运移到俯冲带中,并俯冲到60~70km深处,遭受榴辉岩相变质作用,然后折返到地表。

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