| 辽河裂谷东部凹陷粗面岩成因机理探讨 |
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| 引用本文： | 蔡国刚.辽河裂谷东部凹陷粗面岩成因机理探讨[J].地球学报,2010,31(2):245-250. |
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| 作者姓名： | 蔡国刚 |
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| 作者单位： | 中国矿业大学，辽河油田公司研究院 |
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| 摘 要： | 在渤海湾诸盆地中, 唯独辽河盆地东部凹陷发育粗面岩, 引起了国内地质学界的广泛关注。本文通过岩石学特征、构造运动背景和形成环境的综合分析认为: 粗面岩的原始岩浆来源于上地幔的较深部位, 与玄武岩等火成岩属同源岩浆, 但粗面岩经历了更长时间的结晶分异作用; 形成粗面岩的岩浆, 在上涌过程中未经历任何地壳混杂作用, 外部环境属于水下喷发; 构造运动是岩浆活动和火成岩岩性发育及其分布的内因, 东部凹陷沙三中段沉积时期所特有构造运动背景造就了粗面岩发育的内外部环境。
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| 关 键 词： | 东部凹陷 粗面岩 结晶分异 混染 水下环境 成因机理 构造运动 |
Genetic Mechanism of Trachyte in the Eastern Depression of Liaohe Rift |
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| CAI Guo-gang.Genetic Mechanism of Trachyte in the Eastern Depression of Liaohe Rift[J].Acta Geoscientia Sinica,2010,31(2):245-250. |
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| Authors: | CAI Guo-gang |
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| Abstract: | In various basins of the Bohai Bay, only the East Liaohe depression has well-developed trachyte. This phenomenon has long aroused much attention among geologists in China. Based on an integrated analysis of rock characteristics, tectonic movement and formation background, this paper holds that the original trachyte magma was derived from the deeper part of the upper mantle, the basalt and other igneous rocks were comagmatic rocks, but the trachyte experienced a longer time of crystallization differentiation. It is also considered that the formation of trachyte magma in the upwelling process did not experience any mixing action, with the external environment being part of the underwater eruption, that the tectonic movement constituted the internal cause for the development and distribution of magmatic activities and igneous rocks, and that the unique characteristics of the three middle sedimentation periods of the eastern sag created the internal and external environment background for the development of trachyte. |
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| Keywords: | east depression trachyte crystallization differentiation contamination underwater environment genetic mechanism tectonic movement |
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