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徐淮地区早白垩世adakitic岩石中榴辉岩类捕虏体中金红石的SIMSU-Pb定年:对华北克拉通东部陆壳加厚时间的制约

DOI: 10.1007/s11430-014-5043-9, PP. 553-560

Keywords: 华北克拉通,陆壳加厚,榴辉岩类捕虏体,金红石,SIMSU-Pb定年

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Abstract:

?报道了徐淮地区早白垩世adakitic岩石中榴辉岩和石榴辉石岩(退变榴辉岩)捕虏体中金红石的SIMSU-Pb定年结果,并讨论了其地质意义.含有韭闪石的榴辉岩中金红石的定年结果为(209±25)Ma,而石榴辉石岩中金红石的定年结果为(132±7)Ma.前者与大别-苏鲁超高压变质带的第一次折返时间相近,揭示中生代早期华北克拉通东南缘陆壳加厚事件的存在和这一加厚事件与扬子-华北克拉通之间的俯冲碰撞有关,后者与寄主岩浆的侵位时间相当,反映寄主岩浆捕获石榴辉石岩后金红石U-Pb体系才开始计时,而之前处于高于封闭温度的地壳深度.

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