Chronological evidence of Cenozoic activity in the middle and southern part of Ailao Mountain-Red River fault zone
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摘要: 运用同位素年代学研究哀牢山—红河断裂带的构造演化历史已获得众多成果,但尚未有从低温—中温—高温系统的角度构建热演化史过程的研究,断裂带左旋走滑的启动时间仍存在争议。总结了哀牢山—红河断裂带中南段的年龄数据,通过分析认为相同同位素体系厘定的年龄值从南东端到北西端变新,差异性减小; 将研究区分为北、中、南3段,使用低温、中温、高温年龄构建时间-温度(T-t)变化曲线,热演化史表明断裂带经历了2期冷却历史,冷却速率和隆升剥蚀速率的时空变化记录了伸展应力自南向北依次传播、转换拉张强度在传递过程中逐渐减弱、断裂活动性明显减弱的过程; 将断裂带构造活动划分为快速左旋走滑阶段(35~20 Ma)、左旋走滑逐渐减弱阶段(20~ 6 Ma)及右旋走滑阶段(6 Ma至今)。断裂构造活动反映了印度—欧亚板块碰撞过程中,青藏高原东南缘的应力持续调节过程。
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关键词:
- 哀牢山—红河断裂带中南段 /
- 同位素年龄 /
- 构造-热演化史
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