名詞 epigenesis:

1. a geological change in the mineral content of rock after the rock has formed

ep.i.gen.e.sis

n.（名詞）
Biology The theory that an individual is developed by successive differentiation of an unstructured egg rather than by a simple enlarging of a preformed entity.
【生物學(xué)】 漸成說(shuō)：一種以為個(gè)體是由一個(gè)沒(méi)有組織的卵子經(jīng)過(guò)連續(xù)變異生長(zhǎng)而成， 而非一個(gè)整體簡(jiǎn)單擴(kuò)張形成的理論
Geology Change in the mineral content of a rock because of outside influences.
【地質(zhì)學(xué)】 外力變質(zhì)：因外部影響而使巖石的礦物構(gòu)成發(fā)生變化

【引伸】
ep.igenet.ic