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内蒙古大兴安岭南段东坡莲花山地区电气石成因研究：来自电气石元素地球化学与B同位素制约-Study on the origin of tourmaline in the Lianhuashan area on the East Slope of the Southern Great Xing’an Range, Inner Mongolia: Constraints from geochemical characteristics and boron isotopes of tourmaline