Distribution of trace elements controlled by sector and growth zonings in zircon from a miaskite pegmatite of the Vishnegorsky massif, the Southern Urals

Левашова, Е. В.; Popov, V.A.; Levashov, Dmitry; Rumyantseva, N. A.

doi:10.31897/pmi.2022.29

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…The study of zircon trace elements, which has become possible with the arrival of high-precision microanalytical methods (SIMS, LA-ICP-MS, etc. ), provides more information on petrogenesis [4][5][6]. Therefore, it is important to obtain more evidence for zircon's isomorphic capacity for trace elements and zircon crystallization conditions when its impurity element concentrations are extremely high.…”

Section: Introductionmentioning

confidence: 99%

Th-Rich Zircon from a Pegmatite Vein Hosted in the Wiborg Rapakivi Granite Massif

Skublov,

Petrov,

Galankina

et al. 2023

Geosciences

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Zircon from a pegmatite vein hosted in the rapakivi granites occurring in the Gubanov Intrusion of the Wiborg Massif was shown by the EPMA method to contain an anomalously high Th of 18.3 wt% ThO2 (about 161,000 ppm Th). The SIMS method obtained a close value for thorium content—146,000 ppm. U increases to 6800 ppm. Zircon contains high values of other non-formula elements: Y (up to 51,500 ppm), Ti (up to 12,500 ppm), P (up to 9000 ppm), Nb (up to 3500 ppm), Ca (up to 2800 ppm) and Ba (up to 600 ppm). The average Hf value is 10,900 ppm. Total REE ranges from 25,500 to 49,400 ppm, and the average REE is 33,300 ppm. The REE patterns show poorly HREE fractionation over the LREE (LuN/LaN ratio average is 6.34) with well-marked negative Eu anomalies (Eu/Eu* averages 0.10) and slight positive Ce anomalies (Ce/Ce* averages 1.16). The formation of Th-rich zircon indicates that residual fluid-saturated pegmatite melt is saturated with Th and other trace elements (REE, Y, U, Ti and Nb).

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Section: Introductionmentioning

confidence: 99%

Th-Rich Zircon from a Pegmatite Vein Hosted in the Wiborg Rapakivi Granite Massif

Skublov,

Petrov,

Galankina

et al. 2023

Geosciences

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Distribution of trace elements in growth zones and sectors of spodumene crystals (Pashki deposit, Nuristan, Afghanistan)

Ivanov,

Hamdard,

Skublov

et al. 2024

МИНЕРАЛОГИЯ (MINERALOGY)

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Regular distribution of several trace elements in spodumene crystals of the Pashki pegmatite Li deposits in Afghanistan (Nuristan province) is analyzed using secondary ion mass spectrometry (SIMS). Twenty seven local analyses of 19 elements were carried out in spodumene samples of different generations taken from pegmatites during feld works of 2023. We studied an early generation spodumene crystal from blocky spodumene-quartz-albite pegmatite and two late generation spodumene crystals including an euhedral crystal from a quartz core of pegmatite and a crystal extracted from a mineralized cavity together with quartz crystal, albite, and muscovite. It is found that the Fe, B, and Be content is signifcantly higher in the growth pyramid of the pinacoid face (010) than in the growth pyramid of the prism face (021). From early to late growth zones, the Be, B, Fe, and Mn content increases and the K, Rb and Ti content decreases. The heterogeneity of trace element composition of spodumene crystals thus mostly depends on their sectoriality, which is caused by different crystal chemical conditions of the incorporation of isomorphic trace elements into the mineral structure on faces parallel and perpendicular to the direction of pyroxene chains of Si–O tetrahedra along axis [001] rather than by their zonation. From early to late generations of spodumene, the content of most analyzed trace elements signifcantly decreases corresponding to the ideas about the change in the crystallization fractionation of elements during the evolution of the pegmatite process transiting from the closed to open physicochemical system.

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Trace element composition of beryl from spodumene pegmatite deposits of the Kunar Province, Afghanistan

Skublov,

Yosufzai,

Evdokimov

et al. 2024

МИНЕРАЛОГИЯ (MINERALOGY)

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The study of trace element composition of beryl from the Chambalak and Digal deposits of the Darai Pech pegmatite feld of the Kunar province (Afghanistan) using secondary ion mass spectrometry (SIMS) revealed the sectoriality of the beryl crystal from the Chambalak deposit. The inner and outer parts of the profle are identifed as the pinacoid (0001) and prism (10 1 0) growth zones, respectively. At the boundary of these two simple forms, the Cs, Na, Ca, Fe, Mg, and V content strongly increases. The prism growth zone exhibits the growth pyramids: a decrease in the Na, Fe, V, Ni, and Cr content during growth towards the edge of the beryl crystal. The H2O and Mg content increases in the prism growth zone. No boundary between the pinacoid and prism growth zones is observed in beryl from the Digal deposit. There is a reason to consider its profle as the prism growth zone. A comparison of beryl based on the content of indicative elements, the increase of which corresponds to the fractionation trend of pegmatite melt (Cs, Li, and Rb), from pegmatite deposits of the Kunar province with beryl from other objects showed that pegmatite melt in the studied deposits was moderately fractionated corresponding to the initial evolution stages. It is shown that the content of some elements of beryl from the prism and pinacoid growth zones can fundamentally differ.

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Distribution of trace elements controlled by sector and growth zonings in zircon from a miaskite pegmatite of the Vishnegorsky massif, the Southern Urals

Cited by 3 publications

References 33 publications

Th-Rich Zircon from a Pegmatite Vein Hosted in the Wiborg Rapakivi Granite Massif

Th-Rich Zircon from a Pegmatite Vein Hosted in the Wiborg Rapakivi Granite Massif

Distribution of trace elements in growth zones and sectors of spodumene crystals (Pashki deposit, Nuristan, Afghanistan)

Trace element composition of beryl from spodumene pegmatite deposits of the Kunar Province, Afghanistan

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