快速升温 (<2 Ma) 到通过天气层上升的高度温度变形
Guibin Zhang1, Chenguang Wu1, Yang Wang2
1Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
Science advances
|June 12, 2024
概括
喜马拉雅山脉的超高温 (UHT) 变形揭示了快速升温事件. 石块的断裂可能引入了大气层的热量,推动了UHT条件并影响了构造进化.
科学领域:
- 地质地质地质地质地质地
- 构造学 构造学 构造学 构造学
- 变形主义的变形主义
背景情况:
- 超高温 (UHT) 变形,超过900°C,提供了对orogenic系统演变的关键见解.
- 了解UHT变形的持续时间和热源是破译构造过程的关键.
研究的目的:
- 报告在喜马拉雅山东中部发现了含有蓝宝石的颗粒石,保存了UHT证据.
- 为了重建压力-温度-时间路径并确定UHT变态的热源.
主要方法:
- 对含有蓝宝石的颗粒岩石进行石矿学分析.
- 压力-温度-时间 (P-T-t) 路径的重建.
- 数字模拟地-地幔相互作用.
- 与地球物理和地球时间学数据的整合.
主要成果:
- 在喜马拉雅中东发现的UHT变形的证据.
- 在200万年内重建了~200°C的快速温度上升.
- 数字模拟表明,由于板块的断裂/撕裂成为主要热源,而天气层地幔上升.
结论:
- 印度石质层的碎片断裂或撕裂对喜马拉雅山脉构造学具有重要影响.
- 上升的天气层可能为喜马拉雅山脉中米欧纪UHT变态提供了热量.
- 这种机制适用于其他古老的碰撞或产物系统.
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