Tectonic setting discrimination and40Ar/39Ar isotope geochronology of the Miba granite |
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Authors: | Zhang Yan Chen Wen Liu Xinyu Zhang Sihong Wang Songshan |
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Affiliation: | 1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing,China;2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China |
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Abstract: | The Miba granite is located in the juncture of Kang County in eastern Gansu Province and Lueyang County in Shanxi Province. It is considered to be the post-orogenic granite (POG-type) by major element discrimination method of Maniar.40Ar/39Ar dating indicates that its emplacement time is about 240—230 Ma and it is the result of the Indo-Sinian magmatism. In the early Yanshan period (about 193.8 Ma), a thermal event resulted in the partial opening of the argon isotope system of the biotite. |
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