| 辽西地区中生代义县旋回火山活动特征分析 |
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| 引用本文： | 史卜庆,吴智平.辽西地区中生代义县旋回火山活动特征分析[J].高校地质学报,1998,4(4):413-422. |
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| 作者姓名： | 史卜庆 吴智平 |
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| 作者单位： | 石油大学油气资源与环境地质研究所 |
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| 基金项目： | 石油大学（华东）重点科研基金 |
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| 摘 要： | 辽西地区广泛发育中生代火山岩，其中以义县旋回火山岩最为发育。本文在对辽西地区义县旋回火山岩微量元素地球化学特征研究的基础上，认为义县旋回火山岩具有同源性质，由壳幔混溶物质作用于统一的火山活动过程中产生。
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| 关 键 词： | 辽西地区 火山活动 微量元素变化 火山岩 |
| 收稿时间： | 1998-12-20 |
| 修稿时间： | 1998-12-20 |
STUDY ON VOLCANIC ACTIVITIES OF MESOZOICYIXIAN CYCLE, WESTERN LIAONING |
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| Shi Buqing,Wu Zhiping,Zhou Yaoqi,Zhang Dagang,Xu Xiucai.STUDY ON VOLCANIC ACTIVITIES OF MESOZOICYIXIAN CYCLE, WESTERN LIAONING[J].Geological Journal of China Universities,1998,4(4):413-422. |
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| Authors: | Shi Buqing Wu Zhiping Zhou Yaoqi Zhang Dagang Xu Xiucai |
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| Institution: | Petroleum Resource and Environmental Geology Research Institute, University of Petroleum, Dongyin, 257062, Shandong |
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| Abstract: | Mesozoic volcanic rocks are widely distributed in western Liaoning Province. They can be mainly divided into three eruption cycles,i.e. the Xinglonggou, the Lanqi and the Yixian cycles, among which the Yixian cycle is most importantly developed. Based on a high precision sampling on Yixian cycle, this paper made a particular study on the geochemical characteristics of trace elements in volcanic rocks of Yixian cycle. We found that all volcanic rocks in Yixian cycle were derived from a common source, which seems to be an admixture of crust and mantle materials. All of them were formed through several eruption pulses in a prolonged geodynamic process. Each eruption cycle had pulsation character and the volcanic activity weakened gradually. The variation of trace element parameters shows a quite coincidence with the lithology and eruption cycle subdivision,and provides a sensitive indicator on volcanic activities. This paper also discusses the structure background of Yixian volcanic cycle, which should be affected by the lithosphere delamination at K 3-J 1 in this area. |
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| Keywords: | western Liaoning Yixian cycle volcanic activity trace element variation and pulsation |
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