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舟山群岛地区的地质构造背景
ON GEOLOGIC TECTONIC BACKGROUND IN ZHOUSHAN ARCHIPELAGO AREA
【摘要】 从大地构造、磁场和新构造分区特点等方面,对舟山群岛地区的地质构造背景作了较为详细的论述。指出该区处于基底构造交汇、新构造和地震活动强弱分区的过渡地带,新构造运动在中更新世之后超于平稳;全新世为间歇性活动,强度较弱。基底由若干微块体组成,块体间为不稳定边界。舟山群岛及其海域深部以东西向、浅表部以北北东和北东向构造为主,具有孕震和发震的地质构造背景。
【Abstract】 We made detailed discuss on geologic tetonic background in Zhoushan Archipelago area,according to characteristics of geotetonics, magnetic field and neo-tectonic zoning. The study expressed that this area belonged to the transforming region of the junction of basement structure, neo-tectonic movement and seismic activity zoning; neotectonic movement changed as follows: from the intensity before Mosepleisocene to stable movement and then to intermittent motion in Holocene; basement consisted of micro-masses and the boundary was unstable; in Zhoushan archipelago and vicinity area, the main structure was in WE direction in deep layer and in NNE direction in shallow one; there existed the geologic tectonic background of seismogenic condition.
【Key words】 Neotectonic movement; Seismogenic structure; the Zhoushan Archipelago area;
- 【文献出处】 华南地震 ,SOUTH CHINA JOURNAL OF SEISMOLOGY , 编辑部邮箱 ,1995年01期
- 【分类号】P315.2
- 【被引频次】8
- 【下载频次】293