Immiscibility in Glasses from the Siberian Platform Traps

Ryabov, V. V.; Shevko, A. Ya.; Gora, M. P.

doi:10.1007/978-94-007-6881-9_28

Cited by 3 publications

(6 citation statements)

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“…1C-1E and 2;Ryabov, 1989;Ryabov and Lapkovsky, 2010;Ryabov et al, 1985). The melt pools are typically up to several hundred microns in diameter, and commonly almost spherical (Figs.…”

Section: Immiscible Liquids: Occurrence and Compositionmentioning

confidence: 99%

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Magma chamber–scale liquid immiscibility in the Siberian Traps represented by melt pools in native iron

Kamenetsky

Charlier

Zhitova

et al. 2013

Geology

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“…1C-1E and 2;Ryabov, 1989;Ryabov and Lapkovsky, 2010;Ryabov et al, 1985). The melt pools are typically up to several hundred microns in diameter, and commonly almost spherical (Figs.…”

Section: Immiscible Liquids: Occurrence and Compositionmentioning

confidence: 99%

“…Native iron occurs in the Khungtukun intrusion (Ryabov, 1989;Ryabov and Lapkovsky, 2010;Ryabov et al, 1985) belonging to the Maimecha-Kotui magmatic province in the northern part of the ca. 250 Ma Siberian large igneous province.…”

Section: Native Iron In Siberian Tholeiitesmentioning

confidence: 99%

Magma chamber–scale liquid immiscibility in the Siberian Traps represented by melt pools in native iron

Kamenetsky

Charlier

Zhitova

et al. 2013

Geology

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“…Disko Island and Bühl samples have relatively flat HSE patterns (0.5 to 6.2 [Pd/Os] CI ), consistent with the primitive nature of their respective tholeiitic and alkali-basalt parental melts(Figure 4;. By contrast, Siberian samples display more fractionated HSE compositions (47 to 2089 [Pd/Os] CI ), consistent with significant degrees of crystal-liquid fractionation of the basaltic parental melts that formed these intrusions(Ryabov et al, 2014).To examine if available experimental mineral/melt partitioning data can reproduce the HSE patterns observed in samples (specifically PPGE/IPGE fractionation), and to assess the role that siderophile-element rich phases (such as native-Fe or sulfides) play in fractionating HSE profiles, we used a crystallization model that assumes perfect fractional (Rayleigh) crystallization. As a parental melt, we use an average picrite composition reported for West Greenland(Woodland, 2000) and use bulk D values to calculate crystallization trajectories for geologically reasonable mafic (olivine, pyroxene, and plagioclase) systems.…”

mentioning

confidence: 67%

“…These mafic intrusions are in an area known for economic deposits of Cu-Ni-PGE rich sulfides (e.g., Noril'sk, Yakutia; Figure 1a). Both Khungtukun and Dzhaltul are directly underlain by Carboniferous-Permian coal-bearing terrigenous deposits (Ryabov et al, 2014). represent Fe-rich nodules, whereas sample OZ-01-3 is a native-Fe bearing dolerite dike that cuts the Dzhaltul intrusion, containing ~25 to 30 modal % native-Fe.…”

Section: Samplesmentioning

confidence: 99%

Atmospheric outgassing and native-iron formation during carbonaceous sediment–basalt melt interactions

Pernet‐Fisher

Day

Howarth

et al. 2017

Earth and Planetary Science Letters

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Organic carbon-rich sediment assimilation by basaltic magmas leads to enhanced emission of greenhouse gases during continental flood basalt eruptions. A collateral effect of these interactions is the generation of low oxygen fugacities (fO 2) (below the iron-wüstite [IW] buffer curve) during magmatic crystallization, resulting in the precipitation of native-iron. The occurrence of native-iron bearing terrestrial basaltic rocks are rare, having been identified at three locations: Siberia, West Greenland, and Central Germany. We report the first combined study of Re-Os isotopes, highly siderophile element (HSE: Os, Ir, Ru, Pt, Pd, Re), and trace-element abundances for these three occurrences, in addition to host sediments at West Greenland. To quantify the amount of crustal assimilation experienced by the magmas, we present combined crystallization and assimilation models, together with fractional crystallization models, to assess how relative abundances of the HSE have been modified during crystallization. The radiogenic osmium isotopic compositions (γOs initial +15 to +193) of mafic igneous samples are consistent with assimilation of old high Re/Os crustal contaminants with radiogenic 187 Os/ 188 Os, whereas the HSE inter-element fractionations (Pd/Os 2 to >10,000) suggest that some Siberian samples underwent an early stage of sulfide removal. Metalliferous samples from the Siberian intrusions of Khungtukun and Dzhaltul (associated with the Siberian flood basalts) yield internal 187 Re-187 Os ages of 266 ±83 Ma and 249 ±50 Ma, respectively, reflecting late-Permian emplacement ages. These results imply that crustal assimilation took place prior to crystallization of native-Fe. In contrast, metalliferous samples from Disko Island and Bühl (associated with the West Greenland flood basalts, and the Central European Volcanic Province, respectively) have trends in 187 Re/ 188 Os-187 Os/ 188 Os space corresponding to apparent ages older than their reported crystallization ages. These anomalous ages probably reflect concurrent assimilation of high Re/Os, radiogenic 187 Os crust during crystallization of native-Fe, consistent with the character of local West Greenland sediments. In all three locations, calculations of combined assimilation of crustal sediments and fractional crystallization indicate between 1-7 % assimilation to account for the Os-isotope systematics. In the case of Siberian samples, incompatible trace-element abundances indicate that lower crustal assimilation may have also occurred, consistent with the suggestion that crustal assimilation took place prior to native-Fe precipitation. The extent of local crustal contamination at Disko Island and Bühl necessitates that significant quantities of CH 4 , CO, CO 2 , SO 2 and H 2 O were released during assimilation of carbonaceous Pernet-Fisher et al. The origin of native-iron 3 sediments. Consequently, carbonaceous sediment-basalt melt interactions have collateral effects on total gas output from flood basalt volcanism into the atmosphere. However, the amount ...

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“…For example, the Oktyabr'sky deposit comprises huge sulfide veins (up to 50 m) related to thin intrusive bodies (average 89 m thick; [29]). In order to explain this phenomenon, it was suggested that sulfides were transported by magma from an intermediate chamber to the modern one (closed system), or that they crystallized in situ after involving an external sulfur source, such as sulfate-bearing host rocks [19,66,67] or gases [9,[68][69][70][71] (open magmatic system). Thus, the most important points in the Norilsk ore origin are as follows: (1) the composition of the primary magmas for the ore-bearing intrusions, (2) the type of magmatic system (closed or open), and (3) the scope and significance of assimilation.…”

Section: Problems Of the Origin Of The Norilsk Depositsmentioning

confidence: 99%

Chemical Characteristics of Ore-Bearing Intrusions and the Origin of PGE–Cu–Ni Mineralization in the Norilsk Area

et al. 2021

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The composition of the parental magmas of Cu–Ni deposits is crucial for the elucidation of their genesis. In order to estimate the role of magma in ore formation, it is necessary to compare the compositions of silicate rock intrusions with different mineralization patterns, as observed in the Norilsk region. The rock geochemistry of two massifs located in the same Devonian carbonate rocks—the Kharaelakh intrusion, with its world-class platinum-group element (PGE)–Cu–Ni deposit, and the Pyasinsky–Vologochansky intrusion, with its large deposit—was studied. Along with these massifs, the Norilsk 2 massif with noneconomic mineralization intruded in the Ivakinskaya–Nadezhdinskaya basalts was studied as well. Their settings allow the estimation of the parental magma composition, taking into account the possible assimilation of host rocks. Analyses of 39 elements in 97 samples demonstrated the similarity of the intrusions in terms of their major components. The Pyasinsky–Vologochansky intrusion contains the highest trace element contents compared with the Kharaelakh and Norilsk 2 massifs, evidencing its crystallization from evolved parental magma. No influence of host rocks on the silicate rock compositions was found, except for narrow (1–2 m) endo-contact zones. There is no correlation between the mineralization volume and the rock compositions of the studied intrusions. It is assumed that the intrusions were formed from one magma crustal source irregularly rich in sulfur (S). This source inhomogeneity in terms of the sulfur distribution resulted in deposits of varying sizes. The magmas served as a transporting agent for sulfides from deep zones to the surface.

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Immiscibility in Glasses from the Siberian Platform Traps

Cited by 3 publications

References 0 publications

Magma chamber–scale liquid immiscibility in the Siberian Traps represented by melt pools in native iron

Magma chamber–scale liquid immiscibility in the Siberian Traps represented by melt pools in native iron

Atmospheric outgassing and native-iron formation during carbonaceous sediment–basalt melt interactions

Chemical Characteristics of Ore-Bearing Intrusions and the Origin of PGE–Cu–Ni Mineralization in the Norilsk Area

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