退变质过程以黄铁矿变斑晶生长、矿石糜棱岩的形成、二次退火和化学再活化为特征。
Retrograde metamorphism at Hongtoushan is characterized by porphyroblastic growth of pyrite, formation of ore mylonite, secondary annealing and chemical remobilization.
该类花岗岩中存在两种堇青石：一种呈变晶状或不规则状聚晶出现，属于源岩的不熔残余物成因；
There are two kinds of cordierites: one occurs as crystalloblastic or irregular polycrystal, which result from unmolten residues of mudstone;
变质岩中包含变品结构中的嵌晶多数集中于主晶中部，且晶粒大；
Poikilitic in the poikiloblastic texture of metamorphic rock most concentrate in the middle part of host and the grain size of crystal is large;
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