2017年6月16日
Scanning SQUID microscopy of a ferromanganese crust from the northwestern Pacific: Submillimeter scale magnetostratigraphy as a new tool for age determination and mapping of environmental magnetic parameters
Geophysical Research Letters
- ,
- ,
- ,
- ,
- ,
- 巻
- 44
- 号
- 11
- 開始ページ
- 5360
- 終了ページ
- 5367
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/2017GL073201
©2017. American Geophysical Union. All Rights Reserved. Ferromanganese crusts record long-term deep-sea environmental changes. Thus, providing their reliable high-resolution age models is important. We applied a magnetostratigraphic technique to estimate the growth rate of a ferromanganese crust using scanning SQUID (superconducting quantum interference device) microscope (SSM). SSM is designed to map the magnetic field across thin sections with submillimeter resolution. The crust sample was taken from the Takuyo-Daigo Seamount, northwestern Pacific, and recorded a limited supply of dust and sediment from continents. After drift correction and removal of spike noises, the magnetic field values were stacked within the areas of high signal-to-noise ratios. By correlating the obtained profiles with a standard geomagnetic polarity timescale, we obtained an average growth rate of 3.37 ± 0.06 mm/Ma, which is consistent with that obtained by 10Be/9Be geochronology (2.93 ± 0.15 mm/Ma). S ratio mapping shows low values after ~3 Ma, associated with voids between columnar structures.
- リンク情報
- ID情報
-
- DOI : 10.1002/2017GL073201
- ISSN : 0094-8276
- eISSN : 1944-8007
- SCOPUS ID : 85020065095