Absolute age, petrology, geochemistry and ore mineralization of Tochilny stock in Gorny Altai
| Autor: | Anatoliy Ivanovich Gusev, Nikolay Ivanovich Gusev, Evgeniya Mikhailovna Tabakaeva |
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| Jazyk: | ruština |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 328, Iss 3 (2017) |
| Druh dokumentu: | article |
| ISSN: | 2500-1019 2413-1830 |
| Popis: | The relevance of the discussed issue is caused by the need of researching absolute age, petrology, geochemistry and ore mineralization of Tochilny stock which is represented by strong fractionated rocks from melanosienite to leucogranite. Different types of ore mineralization of rare earth pegmatites and juweller-ornamental stones are related to such rocks spatially and paragenetically. The main aim of the research is to study absolute age, petrology, geochemical features of rocks and ore mineralization of Tochilny stock using the experimental diagrams, which allow solving the genetic problems and the physic-chemical features of petrogenesis. The methods used in the study. Rare and scattered elements were determined in rocks by inductively coupled plasma method on the mass spectrometer «ОРTIMA-4300», the rest elements, including REE, were determined by La-ISP-MS methods in the Laboratory VSEGEI (Saint-Petersburg) and OIGaG SO RAN (Novosibirsk). The absolute age of forming rocks was determined by U-Pb SIMS (ion microzond SHRIMP -II) method on zircon in the Laboratory VSEGEI (Saint-Petersburg). Results. The paper introduces the data on absolute age, geochemistry and petrology of granitoids of Tochilny stock and its ore mineralization. Melanosyenite, syenite, granite-porphyre and leucogranite were revealed in the stock. Stock formation lasts for prolong period in 24 mln. years (from 238 to 262 mln. years). So long period of forming caused by combining derivates of high-K shoshonitic series rocks and high-K adakite-like differences in one stock. Considering the Nb/Ta ratio in rocks one can assume melting of amphibole-contenting source, meeting the high-Nb basalts (NEB) of thickened lower earth crust. This subcontinental lithospheric mantle, transformed by basalt magmas, generated at subduction ocean lithosphere melting, was transformed under the effect of plume source. Rare metal pegmatites, related to granitoids of Tochilny stock, refer to the Nb>Ta-Y-F (NYF) family. According to the geochemical data pegmatites refer to rare earth elements class (REE) enriched with Zr, Ta, Nb. The tetradic effect of REE M-type fractionation occurs in syenites. |
| Databáze: | Directory of Open Access Journals |
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