| 郯庐断裂带的岩石圈结构及其成因分析 |
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| 引用本文： | 朱光,宋传中,牛漫兰,刘国生,王勇生.郯庐断裂带的岩石圈结构及其成因分析[J].高校地质学报,2002,8(3):248-256. |
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| 作者姓名： | 朱光 宋传中 牛漫兰 刘国生 王勇生 |
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| 作者单位： | 合肥工业大学资源与环境工程学院，安徽合肥 230009 |
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| 基金项目： | 国家自然科学基金（编号:49872074）和教育部高等学校骨干教师项目资助 |
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| 摘 要： | 横穿郯庐断裂带的五条地学断面揭示，断裂带两侧地壳结构明显不同，这是平移运动造成不同块体拼合的结果。早白垩世走滑期的岩浆活动，指示当时断裂带切入了壳－幔边界。这表明断裂带在走滑中切穿了整个地壳，莫霍面当时应为平缓的大型拆离面，壳－幔之间发生了显著的失耦。断裂带在晚白垩世－早第三纪的伸展活动中，软流圈进行了强烈的上隆，岩石圈出现了显著的细颈化，属于纯剪切伸展模式。在晚第三纪以来的挤压活动中，浅埋软流圈背景上较高的上地幔温度，使郯庐断裂带成为岩石圈薄弱带，从而发生了较强的逆冲活动和大规模幔源玄武岩浆的喷发。
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| 关 键 词： | 郯庐断裂带 地学断面 岩石圈结构 软流圈 莫霍面 |
| 文章编号： | 1006-7493(2002)03-248-09 |
| 修稿时间： | 2002年7月11日 |
Lithospheric Textures of the Tan-Lu Fault Zone and their Genetic Analysis |
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| ZHU Guang,SONG Shuan-zhong,NIU Man-lan,LIU Guo-sheng,WANG Yong-sheng.Lithospheric Textures of the Tan-Lu Fault Zone and their Genetic Analysis[J].Geological Journal of China Universities,2002,8(3):248-256. |
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| Authors: | ZHU Guang SONG Shuan-zhong NIU Man-lan LIU Guo-sheng WANG Yong-sheng |
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| Institution: | College of Resource and Environment Engineering, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | Five geoscience transects across the Tan-Lu Fault Zone show that crustal textures are obviously different on both sides of the fault zone. The difference is caused by strike-slip movement on the fault zone. Early Cretaceous magmatism during the strike-slip movement indicates that the fault zone cut into crust-mantle boundary. These data demonstrate that the fault zone cut through whole crust during the strike-slip movement and the Moho should serve as large-scale gentle detachment while decoupling took place between crust and mantle. During extensional activities of Late Cretaceous to Eogene, intense upwelling of asthenosphere happened under the fault zone, leading to lithospheric necking in pure shear model. In compressive activities since Neogene, higher temperature of upper mantle due to shallower asthenosphere made the fault zone became a weaker belt in lithosphere. Therefore, the fault zone experienced stronger thrusting and large-scale eruption of mantle-derived basalt. |
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| Keywords: | Tan-Lu Fault Zone geoscience transect lithospheric texture asthenosphere Moho |
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