深成变质作用
- 网络plutonic metamorphism
深成变质作用-
上古生界有机质早期主要以深成变质作用为主；
The organic matter in the Upper Paleozoic strata mainly experienced hypozonal metamorphism in early stage .
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关于煤的变质因素，文中否定了那种把该煤田煤变质因素单纯归结了深成变质作用的观点。
The opinion is denied of the metamorphic factor only relying on to regional metamorphism in the paper .
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第一阶段是以深成变质作用形成低煤级煤为主；
Such characteristics of Chinese coal metamorphism could not be formed by the geothermal metamor-phism during the first evolutional stage of coal metamorphism alone because the burial depth was usually shallow ;