• 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 >Pressure and temperature evolution of upper mantle under the Rio Grande Rift
【24h】

Pressure and temperature evolution of upper mantle under the Rio Grande Rift

机译：里奥格兰德大裂谷下上地幔的压力和温度演变

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

Spinel peridotite xenoliths associated with the Rio Grande Rift axis (Potrillo and Elephant Butte volcanic fields) and the western rift shoulder (Adam’s Diggings) have been investigated to correlate pre-eruptive pressure and temperature conditions with xenolith deformation textures and rift location. Temperatures of xenolith equilibration at the rift shoulder are 100–250°C cooler for a given pressure than the temperatures at the rift axis. Undeformed xenoliths (protogranular texture) are derived from higher temperature and higher pressure conditions than deformed xenoliths (porphyroclastic and equigranular textures) in the rift axis. Exsolution lamellae in pyroxenes, small decreases in Al contents of orthopyroxenes from core to rim, and small differences in porphyroclastic orthopyroxene compositions versus neoblastic orthopyroxene compositions indicate high temperatures followed by cooling and a larger cooling interval in deformed rocks than in undeformed rocks. These features, along with thermal histories based on calcium zoning in olivine rims, indicate that the upper mantle under Adam’s Diggings and Elephant Butte has undergone cooling from an initial high temperature state followed by a late heating event, and the upper mantle under Potrillo has undergone cooling, reheating, and late heating events.
机译：已经研究了与里奥格兰德大裂谷轴（Potrillo和象山坡火山场）和西裂谷肩（亚当的Diggings）相关的尖晶石橄榄岩异岩体，以将喷发前的压力和温度条件与异岩体变形纹理和裂谷位置相关联。对于给定的压力，裂谷肩部的异兽石平衡温度要比裂谷轴上的温度低100–250°C。在裂谷轴上，未变形的异种石（原生颗粒质地）比变形的异种石（卟啉碎屑和等粒质地）源自更高的温度和更高的压力条件。辉石中的层状薄片，从岩心到边缘的邻苯二甲酚的Al含量小幅下降，以及与原始成岩的邻苯二甲酚组成相比，卟啉与邻苯二甲酚组成的细微差异表明，与未变形的岩石相比，变形后的岩石具有较高的高温，冷却和冷却间隔。这些特征以及基于橄榄石边缘钙化分区的热历史表明，亚当的挖掘和象山峰下的上地幔经历了从初始高温状态的冷却，随后又经历了晚期加热事件，而波蒂略峰下的上地幔经历了冷却。冷却，再加热和晚加热事件。

著录项

  • 来源
    《Contributions to Mineralogy and Petrology》 |2004年第3期|265-280|共16页
  • 作者

    Y. Kil; R. F. Wendlandt;

  • 作者单位

    Department of Geology and Geological Engineering Colorado School of MinesIsotope Research Team Korea Basic Science Institute;

    Department of Geology and Geological Engineering Colorado School of Mines;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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