舟山群岛地区的地质构造背景
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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。
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.
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.
引文
1水涛等．中国浙闽变质基底地质．北京：科学出版社，1988．2黄建国等．上海地区更新统承压含水层沉积机制（模式）探讨．上海地质，1992，（2）：15～233黄兆熊等．东海磁场特征的初步研究．上海地质，1992，（1）：12～23
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