| 青藏高原东北隅似三联点构造特征 |
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| 引用本文： | 田勤俭,丁国瑜.青藏高原东北隅似三联点构造特征[J].中国地震,1998,14(4):27-35. |
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| 作者姓名： | 田勤俭 丁国瑜 |
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| 作者单位： | 中国地震局分析预报中心 |
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| 基金项目： | 国家自然科学基金,地震科学联合基金 |
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| 摘 要： | 在大陆内部，对于一定尺度的构造块体，似三联点构造是一种普通的构造形式。由于大陆内部块体旋转的普遍性，似三联点构造可形成顺旋型和逆旋型两种构造型式。
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| 关 键 词： | 似三联点构造 构造变形 青藏高原 断裂 地震地质 |
The Tectonic Feature of a Quasi trijunction in the Northeastern Corner of Qinghai Xizang Plateau |
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| Tian Qinjian\ Ding Guoyu.The Tectonic Feature of a Quasi trijunction in the Northeastern Corner of Qinghai Xizang Plateau[J].Earthquake Research in China,1998,14(4):27-35. |
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| Authors: | Tian Qinjian\ Ding Guoyu |
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| Abstract: | Quasi trijunction is a kind of popular structure with some scale tectonic blocks in continent.Two kinds of quasi trijunction can be formed at the connective area due to rotation of continental blocks,they are clockwise type and anticlockwise type of quasi trijunction.The shape of a quasi trijunction may change gradually accompany with block rotation and tectonic evolution,but,sediment and structure in connective area can record the history of tectonic evolution.Thus,studying a quasi trijunction can recognize regional tectonic evolution. Regional tectonic movement,plane strain partitioning and character of seismic activity can be studied based on kinematic and geometric analysis of a quasi trijunction. Quasi trijunction are surface structure controlled by deep crustal motion.Tectonic activity may different in three branches.In the quasi trijunction of the Northeastern Corner of Qinghai Xizang Plateau,the NWW trending Qilianshan fault zone with sinistral and compressional movement and the NNE trending east edge fault zone of Qinghai Xizang Plateau with dextral movement have deep crustal tectonic background,but,the Liupanshan tectonic zone have divagated from the deep zone. |
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| Keywords: | Quasi trijunction\ Tectonic deformation\ Qinghai Xizang Plateau |
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