极地研究

极地研究 ›› 1996, Vol. 7 ›› Issue (2-English): 94-98.

• 目次 • 上一篇    下一篇

A Sm-Nd mineral isochron of mafic granulite from the Sφstrene Island, East Antarctica

 Ren Liudong1 and Liu Xiaohan2   

  1. 1Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China 2Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China
  • 出版日期:1946-06-30 发布日期:1946-06-30
  • 通讯作者: Ren Liudong
  • 基金资助:

    The project is supported by the State Antarctic Committee of China and the Foundation for Youth of CAGS, China.

A Sm-Nd mineral isochron of mafic granulite from the Sφstrene Island, East Antarctica

 Ren Liudong1 and Liu Xiaohan2   

  1. 1Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China 2Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China
  • Online:1946-06-30 Published:1946-06-30
  • Contact: Ren Liudong
  • Supported by:

    The project is supported by the State Antarctic Committee of China and the Foundation for Youth of CAGS, China.

PDF (PC)

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摘要：

Redetedrination of the metamorphic age of the gsrnet-bearing mafic wholeulite from the Sstrene Island, Esat Antarctica has been made and an isochron of wholerock-garnet-pyroxene-plagioclase is obtained, giving an age of [604±28(2σ)] Ma. It is pointed out that this age represents the time of peak granulite facies metamorphism ofthe area. As to the geological relation of the Sstrene Island with the Bolingen Islandsand the Larsemann Hills to the east, it is deduced from the rock assemblages, metamorphic superposition, spatial changes and metamorphic ages between the above regions that the degree of the superposition of the later low pressure metamorphism is becoming stronger from west to east. While the evolution of the earlier medium pressure to later low pressure implies probably the substages of the same metamorphic cycle.

Abstract:

Redetedrination of the metamorphic age of the gsrnet-bearing mafic wholeulite from the Sstrene Island, Esat Antarctica has been made and an isochron of wholerock-garnet-pyroxene-plagioclase is obtained, giving an age of [604±28(2σ)] Ma. It is pointed out that this age represents the time of peak granulite facies metamorphism ofthe area. As to the geological relation of the Sstrene Island with the Bolingen Islandsand the Larsemann Hills to the east, it is deduced from the rock assemblages, metamorphic superposition, spatial changes and metamorphic ages between the above regions that the degree of the superposition of the later low pressure metamorphism is becoming stronger from west to east. While the evolution of the earlier medium pressure to later low pressure implies probably the substages of the same metamorphic cycle.