scholarly journals Formation Age of the Dahongliutan Pegmatite Type Rare Metal Deposit in Western Kunlun: Evidence from Muscovite 40Ar/ 39Ar Isotopic Dating

2020 ◽  
Author(s):  
Gengbiao Qiao
Keyword(s):  
Rare Metal ◽  
Isotopic Dating ◽  
Metal Deposit ◽  
Western Kunlun ◽  
Rare Metal Deposit

Geochemistry and Isotope Composition of Paleoproterozoic Granites and Felsic Volcanics of the Elash Graben: Evidence of the Heterogeneity of the Early Precambrian Crust

2021 ◽  
Vol 62 (10) ◽  
pp. 1175-1187
Author(s):  
A.D. Nozhkin ◽  
O.M. Turkina ◽  
K.A. Savko
Keyword(s):  
Isotope Composition ◽  
Volcanic Rocks ◽  
Rare Metal ◽  
Temporal Association ◽  
Metal Deposit ◽  
Wide Range ◽  
Rare Metal Deposit ◽  
Geochronological Study ◽  
Felsic Volcanic ◽  
Felsic Volcanic Rocks

Abstract —The paper presents results of a petrogeochemical and isotope–geochronological study of the granite–leucogranite association of the Pavlov massif and felsic volcanics from the Elash graben (Biryusa block, southwest of the Siberian craton). A characteristic feature of the granite–leucogranites is their spatial and temporal association with vein aplites and pegmatites of the East Sayan rare-metal province. The U–Pb age of zircon from granites of the Pavlov massif (1852 ± 5 Ma) is close to the age of the pegmatites of the Vishnyakovskoe rare-metal deposit (1838 ± 3 Ma). The predominant biotite porphyritic granites and leucogranites of the Pavlov massif show variable alkali ratios (K2O/Na2O = 1.1–2.3) and ferroan (Fe*) index and a peraluminous composition; they are comparable with S-granites. The studied rhyolites of the Tagul River (SiO2 = 71–76%) show a low ferroan index, a high K2O/Na2O ratio (1.6–4.0), low (La/Yb)n values (4.3–10.5), and a clear Eu minimum (Eu/Eu* = 0.3–0.5); they are similar to highly fractionated I-granites. All coeval late Paleoproterozoic (1.88–1.85 Ga) granites and felsic volcanics of the Elash graben have distinct differences in composition, especially in the ferroan index and HREE contents, owing to variations in the source composition and melting conditions during their formation at postcollisions extension. The wide range of the isotope parameters of granites and felsic volcanic rocks (εNd from +2.0 to –3.7) and zircons (εHf from +3.0 to +0.8, granites of the Toporok massif) indicates the heterogeneity of the crustal basement of the Elash graben, which formed both in the Archean and in the Paleoproterozoic.

Ba-dominant fluoroaluminates from the Katugin rare-metal deposit (Transbaikalia, Russia)

2017 ◽  
Vol 472 (1) ◽  
pp. 67-71 ◽  
Author(s):  
A. E. Starikova ◽  
V. V. Sharygin ◽  
E. V. Sklyarov
Keyword(s):  
Rare Metal ◽  
Metal Deposit ◽  
Rare Metal Deposit

scholarly journals Y-REE mineralization in biotite-arfvedsonite granites of the Katugin rare-metal deposit, Transbaikalia, Russia

2019 ◽  
Vol 487 (1) ◽  
pp. 88-92 ◽  
Author(s):  
A. E. Starikova ◽  
E. V. Sklyarov ◽  
V. V. Sharygin
Keyword(s):  
Rare Metal ◽  
Chemical Data ◽  
Host Granite ◽  
Ree Mineralization ◽  
Granite Formation ◽  
Metal Deposit ◽  
Mineral Phases ◽  
Magmatic Stage ◽  
Rare Metal Deposit ◽  
Melt Segregation

We provide the results of study of the extremely enriched in Y-REE carbonate-fluorine isolations from biotite-arfvedsonite granite of the Katugin rare metal deposit. New chemical data of isolations mineral phases - gagarinite-(Y), tveitite-(Y), fluocerite-(Ce), basnaesite, fluornatropyroclore, are delivered. Carbonate-fluoride globule in quartz of hosting granite gives possibility to estimate crystallization order. This finding might be the evidence of silicate-fluorine immiscibility suggested before for Y-REE segregations in the Katugin granites. Fluorine melt segregation took likely place at the magmatic stage of biotite-arfvedsonite granite formation. It causes host granite depletion with fluorine and redistribution of REE and Y in fluorine salt melt.

The unique Katugin rare-metal deposit (southern Siberia): Constraints on age and genesis

2017 ◽  
Vol 91 ◽  
pp. 246-263 ◽  
Author(s):  
D.P. Gladkochub ◽  
T.V. Donskaya ◽  
E.V. Sklyarov ◽  
A.B. Kotov ◽  
N.V. Vladykin ◽  
...  
Keyword(s):  
Rare Metal ◽  
Southern Siberia ◽  
Metal Deposit ◽  
Rare Metal Deposit
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