Abstract
The study presents a complex characteristic of zircon from the Verkhneurmiysky intrusive series with Li-F granites. A wide range of morphological and chemical properties of zircon allowed us to obtain new information on the formation and alteration of zircon from biotite and zinnwaldite granitoids and to determine its features, which contribute to the correct definition of Li-F granites formed directly before the tin mineralization. The reviled trends of zircon morphology and composition evolution in the Verkhneurmiysky granites series are: the high-temperature morphotypes are followed by low-temperature ones with more complicated internal structure with secondary alteration zones, mineral inclusions, pores, and cracks; the increasing concentration of volatile (H2O, F), large ion lithophile (Cs, Sr), high field strength (Hf, Nb) and rare-earth elements with decreasing crystallization temperatures and the determining role of the fluid phase (predominantly, F) in the trace element accumulation. The composition of zircon cores in biotite and zinnwaldite granites is very similar. However, the zircon rims from zinnwaldite granites are much more enriched in trace elements compared to those from biotite granites. The first study of zircon from the Verkhneurmiysky granitoids provides new data on the formation and alteration conditions of granitoids, including zinnwaldite ones.
Highlights
Granitoid plutons are widespread in the Badzhal and Myao-Chan ridges of the AmurRegion and play an important role in the localization of the Badzhal-Komsomolsky tin ore district
The result of this study is a complex characteristic of zircon from the Verkhneurmiysky intrusive series with Li-F granites
A wide range of morphological and chemical features of zircon allowed to obtain new information on the formation and alteration of zircon from granitoids of different types and to determine a set of zircon characteristic features, which contribute to the correct identification of Li-F granites formed directly before the tin mineralization within the Verkhneurmiysky massif
Summary
Granitoid plutons are widespread in the Badzhal and Myao-Chan ridges of the AmurRegion and play an important role in the localization of the Badzhal-Komsomolsky tin ore district. The comprehensive cutting edge study of accessory mineralization, including zircon, which is the most important mineral indicator of petrogenesis, effective geochronometer, and geothermometer, should contribute to the solution to problems of correct granitoid differentiation in the Amur region, the identification of rare-metal granites, and the study of their formation conditions. The purpose of this study was to identify typomorphic features of accessory zircon from the granites of the Verkhneurmiysky massif This set of characteristics should improve the scientific and methodological basis for the identification of rare-metal Li-F granite within the granitoid plutons. To solve these problems, we studied the composition, morphology, and internal structure of accessory zircon from biotite leucogranites and zinwalditic Li-F granites of the Verkhneurmiysky massif
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