Alekseev and Marin rep[orted in 2019 that the problem of the origin of “white granite” in the Kester harpolith of the Arga–Ynnakh–Khaya Pluton is discussed. The morphology, occurrence, and nature of the intrusive contacts of the Kester harpolith prove its magmatic origin. The petrographic and petrochemical properties of “white granite” allow its identification as a post-orogenic rare-metal high-phosphorus granite of the Li-F geochemical type. The magmatic genesis of the “white granite” texture is supported by statistical methods.
The composition, typomorphic properties, ontogenetic features internal structure and relationship of accessory minerals indicate that the major accessories of the granite, that is, cassiterite, columbite, tantalite, “wolframoixiolite,” zircon, and ferberite, were formed at the late stage of the low-temperature rare-metal granitic melt. The Kester harpolith within the Arga–Ynnakh–Khaya granite pluton and the eponymous tin–rare-metal deposit genetically related to it are a part of the Far East Superprovince of rare-metal granites.
The authors concluded that:
1) The morphology, occurrence, and evidence of intrusive contacts of the Kester “white granite” harpolith are reliable signs of its magmatic origin. The harpolith and the accompanied series of small “white granite” and ongonite intrusions form a rare-metal intrusion–dike complex. An explosive pipe composed of breccia with fragments of country granitoids cemented by “white granite” is found in the outer harpolith contact.
2) Petrography and petrochemistry of the “white granite” indicate its formation as a result of crystallization of moderately alkali fluid-saturated magma and allows identification of the studied rock as post-orogenic, rare-metal high-phosphorous granite of the Li-F geochemical type. The magmatic genesis of the “white granite” texture and its partial alteration are supported by statistical methods.
3) Assemblage and chemistry of the accessory minerals of “white granite” correspond those of minerals of subalkali rare-metal gran. Ontogenic analysis of the inner structure of minerals and relationships between them conclude that the major accessories, cassiterite, columbite, tantalite, wolframoixiolite, zircon, and ferberite, were formed at the late low-temperature stage of the rare-metal granite melt.
4) White granite is analogue of the Li-F granites of some rare-metal intrusive complexes in Eurasia. The Kester harpolith of the Arga–Ynnakh–Khaya deposit and the eponymous tin–rare-metal deposit that is genetically related to it are members of the Far East magmatic super province of rare-metal granites.
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