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2017, 36(3) 777-784 DOI:
10.3969/j.issn.1004-5589.2017.03.012 ISSN: 1004-5589 CN: 22-1111/P |
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Chemical composition and geological significance of biotites from monzonitic granite in Tuotuohe Saiduopugangri area in Qinghai |
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FENG Hong-da1, SUN Guo-sheng1, LU Da-chao2, QU Yuan-xin3, JIN Rui-xiang1, HE Xin1, LI Yang1 |
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1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Changchun Gold Design Institute, Changchun 130012, China;
3. Institute of Earth Environment, Chinese Academy of Science, Xi'an 710061, China |
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Abstract��
Electron microprobe analyses (EMPA) demonstrate that biotites from the Saiduopugangri monzonitic granite in Tuotuohe area, Qinghai Province, are enriched in MgO, SiO2, (Na2O+K2O), but relatively depleted in Al2O3 and FeOt, with the characteristics of high M (0.60~0.65), low ��Al (1.30~1.39) and medium Fe/(Mg+Fe) (0.42~0.44), suggesting that they are Mg-biotites. The biotites crystallized at the temperature of 580�� to 645�� with high oxygen fugacity in the magmatic system. The compositions of biotites revel that the calc-alkaline granite formed in the orogenic background and the magma was from crust-mantle mixed source. |
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Keywords��
Qinghai
Saiduopugangri
monzonitic granite
biotites
chemical composition
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Received 2017-04-10 Revised 2017-04-26 Online: |
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DOI: 10.3969/j.issn.1004-5589.2017.03.012 |
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Fund: |
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Corresponding Authors: |
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Email: ludachao1963@qq.com |
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About author: |
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