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- Title
Petrogenesis of Shihuiyao Rare-Metal Granites in the Southern Great Xing'an Range, NE China.
- Authors
Sun, Deyou; Wang, Shicheng; Gou, Jun; Zhang, Duo; Deng, Changzhou; Yang, Dongguang; Tian, Li
- Abstract
Shihuiyao Rb–Nb–Ta-rich granites from the Late Jurassic period are newly discovered rare-metal-bearing granites found in the southern Great Xing'an Range, NE China. Further research of these granites may contribute to better understanding the petrogenesis of rare-metal granites and their associated mineralization mechanisms. The granites are high-silica (SiO2 = 73.66–77.08 wt%), alkali-rich (K2O + Na2O = 8.18–9.49 wt%) and weakly to mildly peraluminous with A/CNK values (molar ratios of Al2O3/(CaO + Na2O + K2O)) ranging from 1.06 to 1.16. High differentiation indexes (DI = 95–97) and low P2O5 contents demonstrate that Shihuiyao rocks are low-P and peraluminous rare-metal granites. Mineral chemistry and whole-rock geochemistry can be used to obtain the following lithological sequence: zinnwaldite granite, muscovite–zinnwaldite granite, amazonite-bearing granite and amazonite pegmatite. The effect of the rare-earth element tetrad; low K/Rb (18.98–32.82), Nb/Ta (2.41–4.64) and Zr/Hf (5.99–8.80) ratios; and the occurrence of snowball-textured quartz suggest that extreme magmatic fractionation might be the key factor that causes Rb–Nb–Ta enrichment.
- Subjects
CHINA; GRANITE; PETROGENESIS; JURASSIC Period; GEOCHEMISTRY
- Publication
Minerals (2075-163X), 2023, Vol 13, Issue 5, p701
- ISSN
2075-163X
- Publication type
Article
- DOI
10.3390/min13050701