Genesis of excess argon in phengite and significance of40Ar-39Ar age spectra for omphacite: A case study on UHP eclogite of South Dabie Terrain, China |
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| Authors: | Songshan Wang Ningjie Ge Haiqing Sang Ji Qiu |
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| Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) Department of Earth and Space Science, University of Science and Technology of China, 230026 Hefei, China |
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| Abstract: | The Ar-Ar dating of phengite and omphacite in ultrahigh-pressure (UHP) eclogite of Bixiling and Hengchong in the South Dabie
Terrain shows that the content range of excess argon is as high as (0.4–1.3)×108 mol · g1. The genesis of the excess argon is discussed. The Ar-Ar age spectra of omphacite could not support the opinion
that the UHP metamorphism occurred in Caledon epoch and pre-Caledon epoch. |
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| Keywords: | South Dabie Terrain ultrahigh-pressure metamorphics phengite omphacite excess argon |
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