Latest Issue
2015 Vol.124 No.3
Photomicrograph of a Mantle Dunite
Xenolith in alkali basalt from Takashima, Saga Prefecture. Dunite, a kind of peridotite, is representative of the uppermost part of the Earth’s upper mantle layer. It occurs frequently as xenoliths in volcanics, e.g., in Cenozoic alkali basalts from Southwest Japan. It is almost completely composed of olivine, the main mantle mineral, and can be formed by deep-seated magmatic processes, such as crystal accumulation from magma or a reaction between pyroxene-bearing peridotite and magma. Although it has a simple mineral assemblage, its genesis is difficult for us to specify. Some olivine grains are kinked to show kink bands （e.g., upper right of the center）, due to deformation after magmatic formation. If we observe a thin section, ca. 0.03 mm in thickness, of peridotites under crossed-polarized light with a polarizing microscope, beautiful stained-glass patterns made by olivine grains are visible. The colors observed under crossed-polarized light with a microscope are called interference colors. The vivid interference colors from the 0.03-millimeter thin section in this photo are characteristic of olivine because of its optical properties.
（Photograph & Explanation: Shoji ARAI）
Special Issue: The Forefront of Mantle Material Research
Overview of the Special Issue “The Forefront of Mantle Material Research”
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 309.
DOI:10.5026/jgeography.124.309
Introduction to the Special Issue “The Forefront of Mantle Material Research”
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 315.
DOI:10.5026/jgeography.124.315
New Insights from Seismic Images of the Oceanic Plate in the Northwestern Pacific（Review Article）
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 321.
DOI:10.5026/jgeography.124.321
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 333.
DOI:10.5026/jgeography.124.333
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 355.
DOI:10.5026/jgeography.124.355
Rheological Properties of Serpentinite and Their Tectonic Significance（Review Article）
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 371.
DOI:10.5026/jgeography.124.371
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 397.
DOI:10.5026/jgeography.124.397
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 411.
DOI:10.5026/jgeography.124.411
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 429.
DOI:10.5026/jgeography.124.429
Traces of Slab-derived Fluids Revealed by Halogens in Mantle-derived Rocks（Review Article）
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 445.
DOI:10.5026/jgeography.124.445
Chemical Composition of Mantle Wedge Fluids（Review Article）
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 473.
DOI:10.5026/jgeography.124.473
Origins of Carbon and Nitrogen in Mantle Xenolith（Review Article）
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 503.
DOI:10.5026/jgeography.124.503
The 100s: Significant Exposures of the World （No. 11）
Ultrapotassic Magma from the Deep Mantle, Leucite Hills Lamproite, Wyoming USA
Journal of Geography (Chigaku Zasshi), 2015, 124(3), 515.
DOI:10.5026/jgeography.124.515
Pictorials
1：Mantle Materials as Xenoliths in Volcanics
Journal of Geography (Chigaku Zasshi), 2015, 124(3), xi.
DOI:10.5026/jgeography.124.xi
2：Mantle Materials Found as Solid-intrusive Rocks
Journal of Geography (Chigaku Zasshi), 2015, 124(3), xii.
DOI:10.5026/jgeography.124.xii
3：Photomicrographs of Mantle Materials
Journal of Geography (Chigaku Zasshi), 2015, 124(3), xiii.
DOI:10.5026/jgeography.124.xiii
4：Similarities between Meteorites and the Earth's Mantle
Journal of Geography (Chigaku Zasshi), 2015, 124(3), xiv.
DOI:10.5026/jgeography.124.xiv
