...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits
【24h】

A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits

机译：挖掘纳米太平洋氢氧化物纳米氢氧化物岩土化矿物沉积物古环境意义的磁化方法

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

Ferromanganese nodules and crusts (Fe-Mn deposits) are being widely explored for their significant economic potential and paleoenvironmentally significant archives. Fe-Mn deposits contain abundant Fe-bearing minerals including detrital minerals, biogenic Fe-bearing components, but predominantly amorphous Fe hydroxides (AFH). Particularly, the hydrogenetic Fe that is formed in bottom water should be closely related with oceanic environmental and Fe-cycling processes. However, it remains challenging to characterize and quantify the x-ray amorphous AFH component in Fe-Mn deposits. To resolve this problem, we systematically investigated thermally treated hydrogenetic Fe-Mn deposits sampled from the northwestern Pacific Ocean to unravel the AFH component. Our results show that the nanometer-sized AFHs can be transformed into strongly magnetic nanometer-sized (approximately 10-20 nm) magnetite upon heating above 500 degrees C, which can be feasibly quantified by systematic rock magnetic analyses. Using this novel approach, several Fe-Mn deposits at different water depths from the western Pacific Ocean are investigated. Our results indicate that the abundance of AFH increase at a water depth of similar to 5000 m, which can be ascribed to bottom-current stratification. The magnetic approach to indirectly quantify the AFH component in Fe-Mn deposits has a great potential in exploring oceanic paleoenvironment significance. (C) 2021 Elsevier B.V. All rights reserved.
机译：铁锰结核和结壳（铁锰矿床）因其巨大的经济潜力和重要的古环境档案而被广泛勘探。铁锰矿床含有丰富的含铁矿物，包括碎屑矿物、生物成因含铁组分，但主要是无定形铁氢氧化物（AFH）。尤其是在底水中形成的水文铁应与海洋环境和铁循环过程密切相关。然而，表征和量化铁锰矿床中的x射线非晶态AFH组分仍然具有挑战性。为了解决这个问题，我们系统地研究了从西北太平洋取样的热处理水文铁锰矿床，以揭示AFH成分。我们的结果表明，纳米尺寸的AFH在加热到500℃以上时可以转变为强磁性纳米尺寸（约10-20 nm）磁铁矿，这可以通过系统的岩石磁性分析进行量化。利用这种新方法，对西太平洋不同水深的几个铁锰矿床进行了研究。我们的结果表明，AFH的丰度在接近5000 m的水深处增加，这可以归因于底部洋流分层。间接定量铁锰矿床中AFH组分的磁学方法在探索海洋古环境意义方面具有巨大潜力。（c）2021爱思唯尔B.V.保留所有权利。

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