publication . Research . 1991

Magnetic microsperules in Permian and Triassic bedded chert from Southwest Japan

Iwahashi,Junko; Yoshida,Masaru; Miono,Shigeyoshi; Santosh,Geetha; Santosh,M.;
Open Access English
  • Published: 01 Mar 1991 Journal: Proceedings of the NIPR Symposium on Antarctic Meteorites, volume 4, pages 420-435
Abstract
Magnetic microspherules collected from the Permian and Triassic bedded cherts in Southwest Japan were studied. The size range, as estimated from 801 microspherules, vary from 3 to 100μm, with a peak size distribution between 10-20μm. Three broad shapes are recognized : spherical-, drop- and rocket-shaped, all categories including hollow particles. The surface textures as studied from scanning electron microscope show five dominant varieties : random mosaic, dendritic mosaic, feather crystal, scaly and cracked, with intermediate textures between these types. Chemical analyses of representative microspherules by electron microprobe indicate that they are mostly co...
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Research . 1991
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