...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Contributions to Mineralogy and Petrology >Timescales of melt generation and the thermal evolution of the Himalayan metamorphic core, Everest region, eastern Nepal
【24h】

Timescales of melt generation and the thermal evolution of the Himalayan metamorphic core, Everest region, eastern Nepal

机译：尼泊尔东部珠穆朗玛峰地区喜马拉雅变质岩心的熔体产生和热演化的时标

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the Everest region of the Nepalese Himalaya, Ar-40/Ar-39 and U-Pb geochronology provide evidence for a complex thermal history marked by multiple episodes of granite intrusion. The oldest mobilized melt formed syn-deformational granitic sills that have U-Pb crystallization ages of 21.33 +/- 0.03 and 21.80 +/- 0.05 Ma. Preserved in these same granites is a record of earlier magmatic crystallization of xenotime, zircon and monazite between ca. 26 Ma and ca. 23 Ma. This pattern of accessory phase crystallization is interpreted to reflect incremental melting and crystallization in the source region of the sills before ultimate melt migration, and provides the earliest evidence for anatexis in the Everest region. The beginning of crustal melting in the Everest region predates the earliest known movement on both the Main Central Thrust and the South Tibetan fault systems, but is temporally associated with the implied pressure decrease between "Eohimalayan" and "Neohimalayan" metamorphism.
机译：在尼泊尔喜马拉雅山的珠穆朗玛峰地区，Ar-40 / Ar-39和U-Pb年代学为复杂的热史提供了证据，其特征是花岗岩侵入多次。最古老的动员熔体形成了同形变质花岗岩基岩，其U-Pb结晶年龄为21.33 +/- 0.03和21.80 +/- 0.05 Ma。在这些相同的花岗岩中保存的记录是，大约在2000年至2020年之间，Xenotime，锆石和独居石的岩浆结晶较早。 26 Ma和大约23 Ma。辅助相结晶的这种模式被解释为反映了在最终熔体迁移之前，窗台源区中逐渐增加的熔化和结晶，并为珠穆朗玛峰地区的麻醉性提供了最早的证据。珠穆朗玛峰地区地壳融化的开始要早于已知的主要中央逆冲运动和藏南断层系统的运动，但在时间上与隐含的“ Eohimalayan”和“ Neohimalayan”变质压力降低有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号