【摘 要】
：
弥渡地区位于滇西北断陷带东南缘,红河断裂带尾端与程海断裂交汇部位,是揭示滇西北断陷带形成机制及其与红河断裂带间运动学关系的关键区域.综合利用遥感解译及野外调查发现,区内主要发育有北东向的毛栗坡断裂,北西—北北西向的凤仪-定西岭断裂、 弥渡断裂、 密祉断裂、 寅街断裂.对断裂错动地质、 地貌体及擦痕的统计分析结果表明,毛栗坡断裂第四纪以左旋走滑活动为主兼具有正断分量;弧形的弥渡断裂及北西向的寅街断裂第四纪期间均以正断活动为主;上新世期间凤仪-定西岭断裂以右旋走滑为主,密祉断裂主要为伸展正断,二者第四纪期间均
【机 构】
：
中国地质科学院地质力学研究所, 北京 100081;新构造运动与地质灾害实验室, 北京 100081;中国地质调查局新构造与地壳稳定性研究中心, 北京 100081;中国地质科学院地质力学研究所, 北
论文部分内容阅读
弥渡地区位于滇西北断陷带东南缘,红河断裂带尾端与程海断裂交汇部位,是揭示滇西北断陷带形成机制及其与红河断裂带间运动学关系的关键区域.综合利用遥感解译及野外调查发现,区内主要发育有北东向的毛栗坡断裂,北西—北北西向的凤仪-定西岭断裂、 弥渡断裂、 密祉断裂、 寅街断裂.对断裂错动地质、 地貌体及擦痕的统计分析结果表明,毛栗坡断裂第四纪以左旋走滑活动为主兼具有正断分量;弧形的弥渡断裂及北西向的寅街断裂第四纪期间均以正断活动为主;上新世期间凤仪-定西岭断裂以右旋走滑为主,密祉断裂主要为伸展正断,二者第四纪期间均无明显活动.据弥渡地区主要断裂的几何形态、 运动学特征及红河断裂带晚新生代活动性变化过程推测,控制弥渡盆地展布的弥渡断裂、 寅街断裂等主要第四纪活动断裂是在继承和改造红河断裂带原有断层行迹的基础上形成的.上新世或更早,弥渡地区及滇西北断陷带的断裂活动与地壳张扭变形可能与红河断裂带尾端伸展变形作用有关,但第四纪期间,程海断裂基本上完全控制了弥渡地区主要活动断裂的发育,这一时期区内张扭变形的动力可能来自于川滇内弧带的顺时针旋转以及周缘南汀河断裂、 畹町断裂与理塘断裂等左旋走滑断裂引起的区域性走滑拉分的共同作用.
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