围岩

围岩
wéiyán
(1) [country rock; surrounding rock]∶某地区常见的岩石(指矿体周围的岩石, 有时也指岩浆侵入体周围的岩石)
(2) [wall rock]∶为断层脉所穿过的岩石; 断层脉或矿床侧的岩石

Advanced Chinese dictionary. 2013.

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