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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XX, Nos.2-3 >
Phase Relations in the Chromium-Poor Part of the System Diopside-Anorthite-Forsterite-MgCr2O4 in Air at 1 atm
| Title: | Phase Relations in the Chromium-Poor Part of the System Diopside-Anorthite-Forsterite-MgCr2O4 in Air at 1 atm |
| Authors: | Onuma, Kosuke Browse this author |
| Issue Date: | Feb-1983 |
| Publisher: | 北海道大学 |
| Journal Title: | 北海道大学理学部紀要 |
| Journal Title(alt): | Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy |
| Volume: | 20 |
| Issue: | 2-3 |
| Start Page: | 171 |
| End Page: | 183 |
| Abstract: | The effect of chromium on the silicate system was studied at 1 atm by adding MgCr2O4 to the join diopside-anorthite-forsterite which is a thermal divide in the system CaO-MgO-Al2O3-SiO2. When a small amount of MgCr2O4 (0.2 - 0.5 wt%) is added to the join, the liquidus surface for spinel expands at the expense of anorthite. Thus, the assemblage diopside + forsterite + anorthite + liquid at a ternary invariant point becomes unstable and the assemblages of diopside + anorthite + spinel + liquid and diopside + forsterite + spinel + liquids appear on the liquidus surface. The points at which these assemblages are present are not "invariant" point but "piercing" point, indicating that the join diopside-anorthite-forsterite with a small amount of chromium is not thermal divide, and that the residual liquid in the crystallization can move through the join diopside-anorthite-forsterite. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/36715 |
| Appears in Collections: | Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XX, Nos.2-3
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