Structure and formation mechanism of the Nizhny Tagil dunite-clinopyroxenite massif, Central Urals

Shmelev, Vladimir R.; Filippova, S. S.

doi:10.1134/s0016852110040047

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…The rocks that make up the plutons are a core of dunite that is concentrically surrounded by borders of clinopyroxenite, hornblendite, and gabbroic rocks. The zoned ultramafic complexes have rock textures that are consistent with (a) crystallization from magma at depth; (b) deformation, recrystallization, and annealing at high temperature; and (c) metasomatic alteration (Burg and others, 2009;Shmelev and Filippova, 2010). Rocks in these small mafic to ultramafic plutons make up a distinct rock association called Uralian-type complexes.…”

Section: Platinum Placer Depositsmentioning

confidence: 96%

Platinum-group elements

Zientek¹,

Loferski²,

Parks³

et al. 2017

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Section: Platinum Placer Depositsmentioning

confidence: 96%

Platinum-group elements

Zientek¹,

Loferski²,

Parks³

et al. 2017

Professional Paper

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“…The banding usually coincides with the mineral flatness of grains in thin sections (Shmelev and Filippova, 2010). A wide variety of shapes and structure-textural types is typical of chromite bodies.…”

Section: Geologic and Petrologic Features Of The Nizhnii Tagil Massifmentioning

confidence: 99%

“…These euhedral Cr-spinels mark early stages of magmatic crystallization of ultrabasic rocks. Coarse (≥1-3 mm) Crspinel occurs as irregularly shaped xenomorphic grains (and aggregates) formed during accumulative recrystallization (Shmelev and Filippova, 2010).…”

Section: Geologic and Petrologic Features Of The Nizhnii Tagil Massifmentioning

confidence: 99%

“…According to most researchers, dunites of the Platinum Belt of the Urals were magmatic (Ivanov, 1997;Krause et al, 2007;Pushkarev et al, 2007;Shmelev, 2007;Shmelev and Filippova, 2010;Vysotskii, 1913;Zavaritskii, 1928). The subsequent evolution of these ultrabasic rocks was related to deformation and recrystallization (Ivanov, 1997;Shmelev and Filippova, 2010;.…”

Section: Introductionmentioning

confidence: 96%

“…The subsequent evolution of these ultrabasic rocks was related to deformation and recrystallization (Ivanov, 1997;Shmelev and Filippova, 2010;.…”

Section: Introductionmentioning

confidence: 98%

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Physicochemical conditions of crystallization of dunites of the Nizhnii Tagil Pt-bearing massif (Middle Urals)

Симонов

Пучков

Prikhod’ko

et al. 2016

Russian Geology and Geophysics

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Studies of primary multiphase silicate inclusions in accessory Cr-spinels from the fine-grained dunites of the Nizhnii Tagil Pt-bearing massif reveal their similarity to melt inclusions trapped by chromite during its growth. The analyzed Cr-spinels with multiphase silicate inclusions differ in composition from ore chromites of the same massif and from chromites (with melt inclusions) from ultramafic oceanic complexes but are similar to Cr-spinels in dunites from Pt-bearing alkaline ultramafic massifs (Konder and Inagli). According to petro-and geochemical data on heated multiphase silicate inclusions, the studied Cr-spinels crystallized with the participation of subalkalic picrobasaltic melts similar to the magmas of the Konder Pt-bearing massif and having almost the same chemical composition as tylaites. The differences between the compositions of olivines formed within the multiphase silicate inclusions and of the rock-forming minerals show that the studied Cr-spinels formed from an intercumulus liquid melt in the olivine crystal interstices during the cumulate crystallization of most of the Nizhnii Tagil massif dunites in the intrusive chamber. Numerical modeling based on the compositions of heated multiphase silicate inclusions in accessory Cr-spinels demonstrates that olivines and Cr-spinels from the studied dunites crystallized at 1430 to 1310 ºC and then olivine formation continued to 1280 ºC during the evolution of melts.

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