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

ADVANCES IN POLAR SCIENCE ›› 1993, Vol. 4 ›› Issue (1-English): 26-34.

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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

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.

Abstract

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

Fu Yunlian, Zhao Yue, Wang Yanbin, Liu Xiaohan, Li Jiliang. ⁴⁰Ar/³⁹Ar ISOTOPIC DATING THE BIOTITES FROM THE IGNEOUS AND METAMORPHIC ROCKS OF THE ZHONGSHAN STATION AREA[J]. ADVANCES IN POLAR SCIENCE, 1993, 4(1-English): 26-34.

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

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