LATE MESOZOIC RARE-METAL GRANITES, PEGMATITES, AND GREISENS OF MONGOLIA: AGE, MINERALOGY, GEOCHEMISTRY, ORE POTENTIAL, AND PETROGENESIS

Antipin, V.S.; Kushch, L.V.; Odgerel, D.; Sheptyakova, N.V.; Khubanov, V.B.; Belozerova, O.Y.

Авторы: Antipin V.S., Kushch L.V., Odgerel D., Sheptyakova N.V., Khubanov V.B., Belozerova O.Yu
Журнал: Russian Geology and Geophysics
Том: 65
Номер: 12
Год издания: 2024
Издательство: ELSEVIER SCIENCE BV
Местоположение издательства: PO BOX 211, AMSTERDAM, NETHERLANDS, 1000 AE
Первая страница: 1397
Последняя страница: 1411
Оригинальные версии: ПОЗДНЕМЕЗОЗОЙСКИЕ РЕДКОМЕТАЛЛЬНО-ГРАНИТНЫЕ СИСТЕМЫ МОНГОЛИИ: ВОЗРАСТ, МИНЕРАЛОГИЯ, ГЕОХИМИЯ, РУДОНОСНОСТЬ И ОСОБЕННОСТИ ПЕТРОГЕНЕЗИСА
DOI: 10.2113/rgg20244756
Аннотация: Comparative analysis of the earlier obtained and new geological data, age, mine ral, petrological, and geochemical compositions of plutons of calcalkalic granitoids and raremetal Li–F granites shows their evolution in a wide time interval during the formation of Mesozoic areas of granitoid magmatism. Mineralogical and geochemi cal analysis of the evolution of plutons of palingenetic calcalkalic granitoids (Baga Hentiyn (MZ ) and Ikh Narotiin = Hiid (MZ )) and intrusions of raremetal Li–F granites of Central and Eastern Mongolia revealed their petrological and geochemical differences. The closure of the Mongol–Okhotsk Basin with the formation of large plutons of calc-alkaliс granitoids, obviously related to collisional processes, did not cause significant enrichment of the late granite phases with lithophile and ore elements. Within the peripheral zones of еру MZ and MZ magmatic areas, 12mineralization is often associated with Mongolian multiphase plutons and small intrusions of rare-metal Li–F granites. The rare-metal granites are characterized by a decrease in indicative K/Rb, Nb/Ta, and Zr/Hf values and a regular increase in F, Li, Rb, Cs, Sn, W, Be, Ta, and Nb contents during the evolution of Li–F magmas. Igneous and, particularly, metasomatic rocks in most intrusions of orebearing raremetal Li–F granites are characterized by significant variations in Sn and W contents. At the magmatic stage, the pegmatoid varieties of amazonite–albite granites and pegmatites of the zonal Baga Gazriin (MZ ) and Barun Tsogto (MZ ) plutons are significantly enriched in both Sn and W. Maximum Sn and W enrichment has been established in greisenized granites and zoned greisen bodies (zwitters), which is due to the percola tion of orebearing solutions into the upper horizons and the mineralization of ore elements in the late phases of intrusions and in metasomatites. The wide variations in the age (321–126 Ma) and trace element and isotope compositions of Mongolian raremetal Li–F granites within various zones of large magmatic areas suggest the influence of mantle plume sources on the composition of rare-metal granitic magmas and on their ore potential in intermediate chambers in the continental crust
Добавил в систему: Хубанов Валентин Борисович

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LATE MESOZOIC RARE-METAL GRANITES, PEGMATITES, AND GREISENS OF MONGOLIA: AGE, MINERALOGY, GEOCHEMISTRY, ORE POTENTIAL, AND PETROGENESISстатья Исследовательская статья

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