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| CHEMISTRY OF VOLCANIC ROCKS OF TIAOJISHAN FORMATION IN BEIPIAO-YIXIAN, WESTERN LIAONING,CHINA |
| PENG Yan-dong1,2, ZHANG Li-dong1,2, ZHANG Chang-jie2, GUO Sheng-zhe2, XING De-he2,3, JIA Bin1,2, CHEN Shu-wang1,2, DING Qiu-hong1,2 |
1. Institute of Resources and Engineering, Northeast University, Shenyang 110004, China;
2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China;
3. Jilin University, Changchun 110061, China |
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Abstract The Mesozoic volcanic rocks are broadly distributed in Western Liaoning Province. The Tiaojishan formation,developed in Beipiao-Yixian area, Western Liaoning, may be divided into three members. And the Tiaojishan volcanic cycle can be subdivided into two sub-cycles.The volcanic rocks belong to high-K calc-alkaline series,with SiO2 of 53.67% to 75%, Al2O3 13.15-19.16, K2O+Na2O 5.17, and δ 1.46-6.83. The ΣREE of the volcanic rocks of Tiaojishan volcanic cycle is high,with rich LREE.The distribution patterns are right-incline, with a slightly low Eu negative abnormality and low Ce abnormality.Studying shows that the volcanic rocks of Tiaojishan volcanic cycle were generated in response to lithosphere extension in the continental intraplate orogenic belt.The lithogenesis take partial melting as a major process.
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Received: 09 April 2003
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2003, Vol. 12 
