Ruby–sapphire–spinel mineralization in marble of the middle and southern Urals: Geology, mineralogy, and genesis

Kisin, A. Yu.; Мурзин, В. В.; Tomilina, A. V.; Pritchin, M. E.

doi:10.1134/s1075701516040036

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…5. The introduction of Al and Cr by metamorphogenic fluids during rock granitization [7,8] does not contradict the facts (i-iv). By "granitization" we mean a high temperature metasomatic process that brings the initial rock closer to granite in chemical composition through the introduction of SiO 2 , Na, K, H 2 O, and the removal of Mg, Fe, Ca and other femic components.…”

Section: Aluminum and Chromium Sources In The Formation Of Ruby And Ementioning

confidence: 75%

“…The time of their massive introduction records the time of stress relief and the drop in all-round pressure. Thus, 1 and 2 type marbles were formed during prograde metamorphism, while type 3 marble was formed during retrograde metamorphism [7,8,33,34].…”

Section: Geological Settingmentioning

confidence: 99%

“…These corundums are confined to cleavage cracks in marbles and are accompanied by colorless phlogopite, pyrite, pyrrhotite, sphalerite, and other minerals. They are replaced by spinel associated with fluorite [7,8]. Type 1 rubies are dark red crystals of tabular shape with the highest Cr 2 O 3 content (1.22-2.91 wt %).…”

Section: Geological Settingmentioning

confidence: 99%

“…7. In Mg-calcite (ruby-bearing) marble, the content of Al and Cr is low at 0.11-0.13 wt % Al 2 O 3 and 0.00096-0.0014 wt % Cr 2 O 3 [8]. Marbleized bituminous organogenic limestones in the marginal parts of the anticlinorium (about 5 km from the Kuchinskoe occurrence) contain 3-times greater the amount of Al and Cr.…”

Section: Aluminum and Chromium Sources In The Formation Of Ruby And Ementioning

confidence: 99%

“…The issue of Al and Cr sources in ruby (a corundum containing a chromium isomorphic impurity) deposits in calcite (dolomite) marbles is actively discussed in the scientific literature. Various ideas have been studied on this issue: (1) the lateritic weathering of an impure limestone [1][2][3][4]; (2) the lenses of bauxite-like sediments in limestones [5]; (3) the desilication of primary sedimentary rocks during regional alkali metasomatism [6]; (4) the introduction of Al and Cr by metamorphogenic fluids during rock granitization and dynamothermal metamorphism [7,8]; (5) the introduction of Al using the gas phase of deep fluids during alkaline magmatism [9]; (6) the introduction of Al as a result of decompression during deep tectonic erosion [10]; and (7) the redistribution of Al and Cr during the metamorphism of sedimentary limestones with evaporitic lenses [11,12]. A review of the views on this issue was given by Giluani et al [13].…”

Section: Introductionmentioning

confidence: 99%

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The First Find of Cr2O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem of Al and Cr Sources

et al. 2020

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The results of the study of eskolaite associated with marble-hosted ruby found for the first time in the Kuchinskoe occurrence (Southern Urals) are presented. Here, eskolaite was located on the surface and near-surface regions of ruby crystals. Eskolaite diagnostics was confirmed by powder X-ray diffraction (URS-55). The morphology and chemical composition of eskolaite and associated ruby was studied using a JSM-6390LV scanning electron microscope and a Cameca SX 100 electron probe microanalyzer. The eskolaite crystals were hexagonal and tabular, up to 0.2 mm in size. Ruby mineralization was formed during prograde and retrograde dynamothermal metamorphism. The eskolaite associated with the prograde stage ruby contained Al2O3 (9.1–23.62 wt %), TiO2 (0.52–9.66 wt %), V2O3 (0.53–1.54 wt %), FeO (0.03–0.1 wt %), MgO (0.05–0.24 wt %), and SiO2 (0.1–0.21 wt %). The eskolaite associated with the retrograde stage ruby was distinguished by a sharp depletion in Ti and contained Al2O3 (12.25–21.2 wt %), TiO2 (0.01–0.07 wt %), V2O3 (0.32–1.62 wt %), FeO (0.01–0.08 wt %), MgO (0.0–0.48 wt %), and SiO2 (0.01–0.1 wt %). The associated rubies contained almost equal amounts of Cr2O3 (2.36–2.69 wt %) and were almost free from admixtures. The identification of the eskolaite associated with the marble-hosted rubies from the Kuchinskoe occurrence is a new argument in favor of introduction of Al and Cr into the mineral formation zone. The mineralization was localized in the metamorphic frame of the granite gneiss domes and was formed synchronously with them.

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Section: Aluminum and Chromium Sources In The Formation Of Ruby And Ementioning

confidence: 75%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Aluminum and Chromium Sources In The Formation Of Ruby And Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The First Find of Cr2O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem of Al and Cr Sources

et al. 2020

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Global spatio-temporal variations and metallogenic diversity of karst bauxites and their tectonic, paleogeographic and paleoclimatic relationship with the Tethyan realm evolution

Yang

Wang²,

Liu³

et al. 2022

Earth-Science Reviews

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The genetic linkage between the Yuanjiang marble-hosted ruby deposit and Cenozoic tectonic evolution of the Ailao Shan-Red River shear zone (Southwest China)

Yang

Sun

Shi

et al. 2019

Journal of Asian Earth Sciences

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Ruby–sapphire–spinel mineralization in marble of the middle and southern Urals: Geology, mineralogy, and genesis

Cited by 6 publications

References 8 publications

The First Find of Cr2O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem of Al and Cr Sources

The First Find of Cr2O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem of Al and Cr Sources

Global spatio-temporal variations and metallogenic diversity of karst bauxites and their tectonic, paleogeographic and paleoclimatic relationship with the Tethyan realm evolution

The genetic linkage between the Yuanjiang marble-hosted ruby deposit and Cenozoic tectonic evolution of the Ailao Shan-Red River shear zone (Southwest China)

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