Discovery of Ni-rich spinels in Upper Triassic chert of the Mino Terrane, central Japan

• Sato Honami

  Department of Earth and Environmental Sciences, Kagoshima University

• Onoue Tetsuji

  Department of Earth and Environmental Sciences, Kagoshima University

Bibliographic Information

Other Title

• 中部日本，美濃帯の上部トリアス系チャートから発見したNiに富むスピネル粒子
• チュウブ ニホン ミノタイ ノ ジョウブ トリアスケイ チャート カラ ハッケン シタ Ni ニ トム スピネル リュウシ

Abstract

The magnetic fraction of a lower Norian claystone layer (ca. 5 cm thick) in a radiolarian chert succession within the Mino Terrane, Inuyama area, Central Japan, contains a large number of small euhedral to subhedral crystals of oxidized Ni-rich spinels. The stratigraphic position of this concentration of Ni-rich spinels is clearly indicated by a sharp increase in magnetic susceptibility at the claystone layer. These spinels are distinguished from typical igneous spinels by their high Ni and Fe³⁺ contents, and show large variations in composition. The textures and chemical compositions of the spinel crystals are similar to those of Ni-rich spinels at the Cretaceous-Paleogene boundary. The discovery of Ni-rich spinels in a lower Norian claystone suggests an important sedimentary record of an extraterrestrial impact in the Late Triassic.

Journal

• The Journal of the Geological Society of Japan

  The Journal of the Geological Society of Japan 116 (10), 575-578, 2010

  The Geological Society of Japan

Keywords

• Mino Terrane
• Inuyama area
• Upper Triassic
• chert
• Ni-rich spinels

Details

• CRID: 1390001206238496896
• NII Article ID: 130000413150
• NII Book ID: AN00141768
• DOI: 10.5575/geosoc.116.575
• ISSN: 13499963
• ISSN: 00167630
• NDL BIB ID: 10894232
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10894232
• Web Site: https://www.jstage.jst.go.jp/article/geosoc/116/10/116_10_575/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed