暗化黑云母是识别喷溢作用的标志之一。流纹岩的黑云母常出现暗化,但松脂岩、珍珠岩中的黑云母却没有暗化现象(图版Ⅰ)。据 B·H·洛多奇尼柯夫的意见,黑云母的暗化,主要是受高温的影响,使黑云母分解,析出磁铁矿形成暗化黑云母,而高温的获得又与基质晶化时释放能量有关。笔者认为高温虽是黑 Darkening the mica is one of the hallmarks of the spill-over effect. Rhyolite biotite often appear darkening, but pinnacle, pearlite biotite is not darkening phenomenon (Plate I). According to BD Hodorusov’s opinion, the darkening of biotite is mainly caused by the high temperature, which causes the biotite to decompose and precipitate the magnetite to form dark biotite, while the high temperature is obtained again with the matrix crystal The release of energy-related. Although I think the high temperature is black