PETROLOGICAL EVIDENCES OF SYNDEFORMATION SEGREGATION OF CHROMITES DURING DUNITE FORMATION: EXAMPLE OF KRAKA OPHIOLITES, SOUTH URALS
Results of structural and mineralogical studies of chromitite-bearing zone localized in spinel peridotites of the Middle Kraka ophiolite massif are presented. The rocks of the studied area are characterized by deformation structures, which are cuased by plastic flow under high-PT conditions. Olivine...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
2016-12-01
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| Series: | Минералогия |
| Subjects: | |
| Online Access: | https://journal.mineralogy.ru/wp-content/uploads/2019/09/2016-4-5.pdf |
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| Summary: | Results of structural and mineralogical studies of chromitite-bearing zone localized in spinel peridotites of the Middle Kraka ophiolite massif are presented. The rocks of the studied area are characterized by deformation structures, which are cuased by plastic flow under high-PT conditions. Olivine in dunites was mostly deformed along the slide system of {0kl} [100]. The plastic flow of the peridotites led to the formation of the dunite veins and zones. Plastic deformation of olivine was accompanied by the formation of fine thread-like chromites, which have further been coalesced. X-ray-tomographic studies showed that the increase in the Cr-spinel value and redistribution of ore minerals occurred even in thin dunite veinlets. Some arguments are provided in favor of rheomorphic differentiation of matter in the mantle, which caused the formation of chromite bodies. |
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| ISSN: | 2313-545X 2782-2044 |