| 松辽盆地裂谷期前火山岩与裂谷盆地关系及动力学过程 |
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| 引用本文： | 刘德来.松辽盆地裂谷期前火山岩与裂谷盆地关系及动力学过程[J].地质论评,1998,44(2):130-135. |
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| 作者姓名： | 刘德来 |
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| 作者单位： | 中国石油天然气总公司勘探局，大庆石油学院勘探系 北京，100724，黑龙江安达，151400 |
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| 基金项目： | 国家“八五”科技攻关项目(编号 85-102-02-01) |
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| 摘 要： | 松辽盆地存在裂谷期前火山岩，之后上地壳脆性伸展发育半地堑裂谷盆地。裂谷期前火山岩近水平展布于基底之上，裂谷期，沉则分布于半地暂内，两者属于不同构造层。
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| 关 键 词： | 松辽盆地 火山岩 裂谷盆地 半地堑 动力学 |
Relation Between Prerift Volcanics and the Rift Basin and Geodynamic Processes |
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| Liu Delai.Relation Between Prerift Volcanics and the Rift Basin and Geodynamic Processes[J].Geological Review,1998,44(2):130-135. |
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| Authors: | Liu Delai |
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| Abstract: | In the Songliao basin there occurred pre-rift volcanic rocks. Then brittle extension of the upper crust gave rise to a semi-graben rift basin. Pre-rift volcanic rocks are distributed subhorizon-tally on the basement, while the sediments of the rifting stages are distributed in the semi- graben, both belonging to different tectonic layers. Pre-rift volcanic rocks may be the product of thermal thinning of the subcrustal lithosphere before the extension of the upper crust and volcan-ism reached a culmination near the rifting stage. The sediments of the rifting stage are the product of extension of the upper crust. The lithospheric extension is a process of balance between tensile strength and extensional stress. Volcanic eruption predominated when extensional stress was smaller than the tensile strength; when the extensional stress was equal to or greater than the tensile strength, the lithosphere would undergo lateral separation, resulting in extension of the upper crust and development of a rift basin and meanwhile volcanism weakened. |
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| Keywords: | Songliao basin volcanic rock rift basin half-graben geodynamics |
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