Zircon chronology and REE geochemistry of granulite xenolith at Hannuoba

被引:89
作者
Fan, QC [1 ]
Liu, RX
Li, HM
Li, N
Sui, JL
Lin, ZR
机构
[1] State Seismol Bur, Inst Geol, Beijing 100029, Peoples R China
[2] Minist Geol & Mineral Resources, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 1998年 / 43卷 / 18期
关键词
age of zircon; granulite xenolith; Hannuoba;
D O I
10.1007/BF02883438
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The lower crustal xenolith of mafic two-pyroxene granulite (the majority) and hypersthene granulite in the Cenozoic basalt at Hannuoba have the characteristics of igneous blastic structure and granulite facies metamorphic recrystallization. Study on the zircon chronology and REE geochemistry of granulite xenolith shows that the underplating of basic magma into the lower crust during late Mesozoic led to the formation of mafic accumulate, which further through metamorphism of granulite facies formed the high-density and high-velocity crustal bottom layer at the lower crust. This suggests that the underplating of mantle magma is the important way for the vertical overgrowth of continental crust since the Phanerozoic and provides new evidence for crust-mantle interaction.
引用
收藏
页码:1510 / 1515
页数:6
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