| 拆沉作用(delamination)及其壳—幔演化动力学意义 |
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| 引用本文： | 高山,金振民.拆沉作用(delamination)及其壳—幔演化动力学意义[J].地质科技情报,1997(1). |
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| 作者姓名： | 高山 金振民 |
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| 作者单位： | 中国地质大学地球科学学院 |
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| 基金项目： | 国家自然科学基金,国家教委基金 |
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| 摘 要： | 拆沉作用导致下地壳和岩石圈地幔下沉，相应软流圈上涌至壳—幔边界，使下地壳、岩石圈地幔和软流圈三者发生物质交换，引起岩浆作用、山脉隆升、伸展、垮塌，形成坳陷盆地，并最终使大陆地壳向长英质方向演化，产生与其它行星不同的、独一无二的中性安山质或英云闪长质成分。拆沉作用是对经典板块构造理论的重要补充与完善
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| 关 键 词： | 拆沉作用 下地壳 岩石圈地幔 软流圈 山脉隆升 盆地形成 |
DELAMINATION AND ITS GEODYNAMICAL SIGNIFICANCE FOR THE CRUST MANTLE EVOLUTION |
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| Gao Shan,Jin Zhenming.DELAMINATION AND ITS GEODYNAMICAL SIGNIFICANCE FOR THE CRUST MANTLE EVOLUTION[J].Geological Science and Technology Information,1997(1). |
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| Authors: | Gao Shan Jin Zhenming |
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| Abstract: | Delamination leads to the sink of the lower continental crust and the lithospheric mantle into the asthenosphere and concomitant uprise of the asthenosphere onto the crust mantle boundary. The process results in exchange between the lower crust, the lithospheric mantle and the asthenosphere and causes magmatism and uplift, extension and collapse of mountains as well as formation of sag basins. It also leads to the evolution of the continental crust towards an intermediate andesitic or tonalitic bulk composition,which is unique in our solar system. The concept of delamination is complementary to the theory of plate tectonics. |
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| Keywords: | delamination lower crust lithospheric mantle asthenosphere mountain uplift basin formation |
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