| 辽西北票、义县地区髫髻山旋回火山岩的地球化学特征 |
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| 引用本文： | 彭艳东,张立东,张长捷,郭胜哲,邢德和,贾斌,陈树旺,丁秋红.辽西北票、义县地区髫髻山旋回火山岩的地球化学特征[J].地质与资源,2003,12(3):177-184. |
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| 作者姓名： | 彭艳东 张立东 张长捷 郭胜哲 邢德和 贾斌 陈树旺 丁秋红 |
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| 作者单位： | 1. 东北大学 资源与土木工程学院, 辽宁 沈阳 110004;2. 沈阳地质矿产研究所, 辽宁 沈阳 110033;3. 吉林大学, 吉林 长春 110061 |
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| 基金项目： | 中国地质调查局“K51E014004(北票)、K51E015005(义县)、K51E015004(上园)、K51E016004(地藏寺)等四幅1:5万域地质调查”项目资助 |
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| 摘 要： | 北票、义县地区髫髻山组可分为3个岩性段.髫髻山火山旋回划分为2个亚旋回.髫髻山旋回火山岩属于高钾钙碱性岩系,SiO2=53.67%~75%,Al2O3=13.15%~19.16%,K2O+Na2O=5.17%,里特曼指数δ=1.46~6.83,平均值为3.06;富碱贫镁,Na2O>K2O.Cr、Ni含量低,亲石元素Rb、Sr、Ba等含量高.稀土元素总量较高,富轻稀土,稀土分布模式呈右倾型,稀土元素分馏明显,总体为负铕异常,弱铈异常.成因研究表明,髫髻山旋回火山作用是在与挤压作用相关的大陆边缘活动带构造环境下,受壳断裂控制形成的,具有造山带火山岩特征.火山岩的成岩作用以部分熔融为主,其源区物质为LREE相对富集的下部玄武质地壳.
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| 关 键 词： | 髫髻山组 火山岩 造山带 部分熔融 辽西 |
| 文章编号： | 1671-1947(2003)03-0177-08 |
| 收稿时间： | 2003-04-09 |
| 修稿时间： | 2003年4月9日 |
CHEMISTRY OF VOLCANIC ROCKS OF TIAOJISHAN FORMATION IN BEIPIAO-YIXIAN, WESTERN LIAONING, CHINA |
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| PENG Yan-dong,ZHANG Li-dong,ZHANG Chang-jie,GUO Sheng-zhe,XING De-he,JIA Bin,CHEN Shu-wang,DING Qiu-hong.CHEMISTRY OF VOLCANIC ROCKS OF TIAOJISHAN FORMATION IN BEIPIAO-YIXIAN, WESTERN LIAONING, CHINA[J].Geology and Resources,2003,12(3):177-184. |
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| Authors: | PENG Yan-dong ZHANG Li-dong ZHANG Chang-jie GUO Sheng-zhe XING De-he JIA Bin CHEN Shu-wang DING Qiu-hong |
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| Institution: | 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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| Keywords: | Tiaojishan formation volcanic rocks intraplate orogenic belt partial melting Western Liaoning |
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