Rare-Metal Pegmatoid Granites, Markers of the Beginning of the Hercynian Within-Plate Stage in the Ol’khon Region of the Baikal Area

Makrygina, V. A.; Suvorova, L. F.; Антипин, В. С.; Makagon, V. M.

doi:10.15372/gig20181208

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“…There are also magnetite, titanite, and apatite. During mineralogical studies, the compositions of rare minerals were determined using Geol Superprobe-733 and JXA 8200 microanalyzers (analyzed by L.F. Suvorova): monazite, xenotime, euxenite, zircon, thortveitite, ittro-wolframite, Nb-Ta-wolframite, wolframoixiolite, cassiterite [17]. Pegmatoid microclinicalbite granites of Tashkiney with a large schlier separation of rare metal pegmatite are essentially potassium rocks (K2O = 5.66-8.60 wt.%) (Table 3, Figure 2), in which the K2O/Na2O ratio is 1.3-2.4.…”

Section: Pegmatite Tashkiney (The Olkhon Island) With Be-nb-ta Minera...mentioning

confidence: 99%

Granites and Pegmatites of the Collisional and Intra-Plate Magmatism of the Baikal Area: Age, Mineralogical and Geochemical Types and Genesis Peculiarities

Антипин¹,

Sheptyakova²,

Kushch³

et al. 2021

Preprint

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The paper presents new data on mineralogical-geochemical peculiarities of the granites and pegmatites of the Baikal area (Olkhon Region) with implications for the age, generation conditions and geodynamic settings of magmatism. The early Paleozoic granitoids of the Olkhon region are syncollisional formations produced from the gneiss-schistose substratum of the Olkhon metamorphic sequences. Pegmatoid granites and pegmatites of the Region were generated within a wide age range (458-390 Ma) and include different mineralogical and geochemical types. Amongst the Early Paleozoic granitoids, pegmatoid rocks are products of the collisional magmatism evolution and are similar to granites in terms of the mineral composition and distribution patterns of rare and rare earth elements. On the Olkhon island (Baikal lake) the pegmatite of the Tashkiney vein belong to the Be-Nb-Ta mineralogical-geochemical type demonstrating high contents of W, Sn U, Th and very low concentrations of Li and volatile components (F, B). In the Pryolkhonye area, vein pegmatite Iliksin is with Li, Be, Nb, Ta mineralization (lepidolite, vorobyevite, samarskite et al). The studied pegmatite veins are similar both by the profound negative Ba, Sr, Eu, and Zr anomalies. The zircons from the Tashkiney vein (390±5.0 Ma) and of the Iliksin vein (430.1±2.2 Ma, U-Pb isotope LA ICP MS metod) indicate the formation of pegmatite at the late post-collisional stage of magmatism in the Olkhon Region. As regard to mineralogical and geochemical characteristics, vein pegmatites with amazonite (Ainsky and Ulan-Nur) belong to the Li-F type. The tantalum mineralization, represented by microlites and minerals of the columbite-tantalite group is associated with the Ainsky amazonite pegmatite. As opposed to the Early Paleozoic syncollisional granitoids and pegmatoid formations, the middle Paleozoic vein bodies of pegmatites (Tashkiney, Iliksin, Ainsky, Ulan-Nur) are regarded as rare-metal pegmatites. In terms of geochemical characteristics, they are similar to the rare-metal pegmatoid granites and pegmatites of the intra-plate setting widespread in Mongolia and Transbaikalia. The rare-metal mineralization in the Olkhon region may be genetically related to the evolution of Be-Nb-Ta and Li-F types of the post-collisional granites and pegmatites.

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Section: Pegmatite Tashkiney (The Olkhon Island) With Be-nb-ta Minera...mentioning

confidence: 99%

Granites and Pegmatites of the Collisional and Intra-Plate Magmatism of the Baikal Area: Age, Mineralogical and Geochemical Types and Genesis Peculiarities

Антипин¹,

Sheptyakova²,

Kushch³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

Rare-Metal Pegmatoid Granites, Markers of the Beginning of the Hercynian Within-Plate Stage in the Ol’khon Region of the Baikal Area

Cited by 1 publication

References 0 publications

Granites and Pegmatites of the Collisional and Intra-Plate Magmatism of the Baikal Area: Age, Mineralogical and Geochemical Types and Genesis Peculiarities

Granites and Pegmatites of the Collisional and Intra-Plate Magmatism of the Baikal Area: Age, Mineralogical and Geochemical Types and Genesis Peculiarities

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