极地研究

极地研究 ›› 1993, Vol. 4 ›› Issue (1-English): 26-34.

• 目次 • 上一篇    下一篇

40Ar/39Ar ISOTOPIC DATING THE BIOTITES FROM THE IGNEOUS AND METAMORPHIC ROCKS OF THE ZHONGSHAN STATION AREA

Fu Yunlian1, Zhao Yue1, Wang Yanbin1, Liu Xiaohan2 and Li Jiliang2   

  1. 1Institute of  Geology, C. A. G. S., Beijing 100037 2Institute of Geology, Academia Sinica, Beijing 100029
  • 出版日期:1943-03-30 发布日期:1943-03-30
  • 通讯作者: Fu Yunlian
  • 基金资助:

    This project is supported by National Science Foudation of China and State Antarctic Committee of China.

40Ar/39Ar ISOTOPIC DATING THE BIOTITES FROM THE IGNEOUS AND METAMORPHIC ROCKS OF THE ZHONGSHAN STATION AREA

Fu Yunlian1, Zhao Yue1, Wang Yanbin1, Liu Xiaohan2 and Li Jiliang2   

  1. 1Institute of  Geology, C. A. G. S., Beijing 100037 2Institute of Geology, Academia Sinica, Beijing 100029
  • Online:1943-03-30 Published:1943-03-30
  • Contact: Fu Yunlian
  • Supported by:

    This project is supported by National Science Foudation of China and State Antarctic Committee of China.

PDF (PC)

944

摘要：

The Zhongshan Station of China is located in the Larsemann Hills, East Antarctica. Low pressure granulite facies gneisses together with late granites are outcroped in the region. Three biotite samples from a garnet segregation, a syenogranite and a granite-pegmetite were measured with 40Ar/39Ar incremental heating technique. Biotites from the garnet segregation give an 40Ar/39Ar plateau age of 504±1Ma. Biotites from the syenogranite yield an 40Ar/39Ar plateau age of 494±1 Ma. Biotites from the granite-pegmatite give an 40Ar/39Ar plateay age of 486±1Ma. They verify 500 Ma thermal event called "Pan African event" by previous K-Ar and Rb-Sr data. They are cooling ages of the biotites when the paleogeotherm of the area droped to the K-Ar closure temperature for biotite.

关键词: Larsemann Hills, biotite, 40Ar/39Ar isotopic, dating, early Paleozoic, Pan African event

Abstract:

The Zhongshan Station of China is located in the Larsemann Hills, East Antarctica. Low pressure granulite facies gneisses together with late granites are outcroped in the region. Three biotite samples from a garnet segregation, a syenogranite and a granite-pegmetite were measured with 40Ar/39Ar incremental heating technique. Biotites from the garnet segregation give an 40Ar/39Ar plateau age of 504±1Ma. Biotites from the syenogranite yield an 40Ar/39Ar plateau age of 494±1 Ma. Biotites from the granite-pegmatite give an 40Ar/39Ar plateay age of 486±1Ma. They verify 500 Ma thermal event called "Pan African event" by previous K-Ar and Rb-Sr data. They are cooling ages of the biotites when the paleogeotherm of the area droped to the K-Ar closure temperature for biotite.

Key words: Larsemann Hills, biotite, 40Ar/39Ar isotopic, dating, early Paleozoic, Pan African event