| 大陆下地壳地球物理异常及其构造意义 |
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| 引用本文： | 李德威,王家映.大陆下地壳地球物理异常及其构造意义[J].地质科技情报,2001,20(3):11-15. |
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| 作者姓名： | 李德威 王家映 |
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| 作者单位： | 中国地质大学 |
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| 基金项目： | 国土资源部 1∶ 2 5万定结幅区域地质调查项目 ( 2 0 0 0 130 0 0 14 5 ) |
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| 摘 要： | 下地壳反射层 (或反射下地壳 )、下地壳低速层和低阻层等一系列惊人发现唤醒我们必须重新认识大陆岩石圈 ,研究大陆下地壳。大陆下地壳中的地震反射层、低速层和下地壳低阻层相互伴生 ,在中、新生代伸展构造区和年轻造山带等活动构造区带的发育程度远远高于前寒武纪地盾和克拉通等稳定构造单元 ,其成因可能与层流构造及其相关的热活动、韧性剪切、岩浆作用、部分熔融、变质反应等有关 ,并随着大陆地壳构造 -热演化而变化。
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| 关 键 词： | 大陆下地壳 地震反射 低速层 低阻层 韧性流层 |
| 文章编号： | 1000-7849(2001)03-0011-05 |
| 修稿时间： | 2000年6月19日 |
GEOPHYSICAL ANOMALY OF CONTINENTAL LOWER CRUST AND ITS TECTONIC SIGNIFICANCE |
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| Li Dewei,Wang Jiaying.GEOPHYSICAL ANOMALY OF CONTINENTAL LOWER CRUST AND ITS TECTONIC SIGNIFICANCE[J].Geological Science and Technology Information,2001,20(3):11-15. |
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| Authors: | Li Dewei Wang Jiaying |
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| Abstract: | A series of astonishing discoveries including seismic reflective,low velocity layer, and low resistivity layer in continental lower crust suggest that we should recognize continental lithosphere, and approach continental lower crust.Seismic reflective,low velocity layer, and low resistivity layer in continental lower crust always occur together, and often image in the active areas such as Cenozoic or Mesozoic extensional tectonic setting and young orogens,rather than the stable areas such as Precambrian shield or craton. They may be related to tectonism and relevant thermal activity, ductile shear, magmatism,partial melting,and metamorphism, and change with evolution of main thermal-tectonic event in continental crust. |
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| Keywords: | continental lower crust seismic reflection low velocity layer low resistivity layer ductile flow layer |
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