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佳木斯地块花岗质片麻岩的独居石年龄及其地质意义

温泉波, 刘永江, 李伟民, 韩国卿, 丁凌   

  1. 吉林大学 地球科学学院,长春 130026
  • 收稿日期:2007-11-14 修回日期:1900-01-01 出版日期:2008-03-26 发布日期:2008-03-26
  • 通讯作者: 温泉波

Monazite Ages and Its Geological Significance of Granitoid Gneiss in the Jiamusi Massif

WEN Quan-bo, LIU Yong-jiang, LI Wei-min, HAN Guo-qing, DING Ling   

  1. College of Earth Sciences, Jilin University, Changchun 130026, China
  • Received:2007-11-14 Revised:1900-01-01 Online:2008-03-26 Published:2008-03-26
  • Contact: WEN Quan-bo

摘要: 依据电子探针独居石Th-U-Pb化学法(CHIME)对分布于佳木斯地块北部花岗质片麻岩进行定年,其中独居石415 Ma年龄值报道了佳木斯地块北部存在志留纪晚期的岩浆热事件,(494.35±23.6)Ma、(506.96±52.20)Ma、(481.04±23.19)Ma的独居石年龄值表明,佳木斯地块北部存在500 Ma(晚泛非期)的高级变质事件,结合南部的锆石SHRIMP年龄数据,认为整个佳木斯地块都存在500 Ma(晚泛非期)的高级变质事件。该时期佳木斯地块和松嫩地块可能已经拼贴到一起,共同遭受了500 Ma(晚泛非期)变质事件的影响。

关键词: 佳木斯地块, 花岗质片麻岩, 独居石(CHIME法)定年

Abstract: The granitoid gneisses in the northern Jiamusi massif is suitable for dating by Chemical Th-U-Total Pb isochron method (CHIME).Monazite dating of 415 Ma indicates a magmato-thermal event in the Late Silurian. The dating results of (494.36 ± 23.6 )Ma,(506.96 ± 52.20)Ma and(481.04±23.19)Ma provide the conclusive evidence for a 500 Ma Late Pan-African high-grade metamorphic event in the northern Jiamusi massif. Combined with the SHRIMP U-Pb zircon dating results from the southern Jiamusi massif, it is concluded that the entire Jiamusi massif has undergone a 500 Ma high-grade metamorphic event. The Jiamusi massif and Songnen massif could have amalgamated and linked together before and were affected variously by metamorphic event during 500 Ma.

Key words: Jiamusi massif, granitic gneiss, monazite method (CHIME) dating

中图分类号: 

  • P542.2
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