摘要
香花岭431岩脉具明显垂直分带,从深部向上依次为:碱长花岗斑岩→翁岗岩和富黄玉翁岗岩→黄英岩和云母黄英岩→萤石化水云母化蚀变岩,它们之间的界线是过度的。翁岗岩属岩浆成因,黄英岩和云母黄英岩的形成以岩浆作用为主,亦有热液活动的参与。它们是高度分异的富氟花岗质残余岩浆结晶的产物。
Although ongonite and topazite have been recognized in several areas in the world, their spacial and genetic relationship is still not clear. Based on recent field and laboratory work, dike No. 431 in Xianghualing district is characterized by a complete suite of vertically zoned rock types, which from the deeper levels upwards are successive: alkali feldspar granite porphyry→ongonite and topaz-rich ongonite→topazite and micaceous topazite→altered rocks. The-transitions between these rock types are gradational. The discordant field relations of the dike, the presence of xenoliths, flow structure, chilled margins, and the phenocrysts that host glass inclusions, as well as the microscopic textures of the rocks, all support an essential magmatic origin for the ongonite, topazite and micaceous topazite in this region. The sericitized-fluoritized rock is mainly the alteration product of topazite and micaceous topazite. The ongonite, topazite and micaceous topazite might be produced by crystallization from the latest portion of residual melt in the highly evolved F-rich rare-metal bearing granitic magmatic systems.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期158-166,共9页
Acta Petrologica Sinica
基金
国家自然科学基金
关键词
翁岗岩
黄英岩
花岗岩体系
岩脉
Ongonite
Topazite
Spatial zonation
Xianghualing
