长英质"(felsic)在地质学中是指主要由轻的元素如硅, 氧, 铝, 钠, 钾组成的硅酸盐矿物, 岩浆, 与岩石。
adj. felsic
misc. quartz-feldspathic
2、变质岩化学类型的划分 Turner(1955): (1)泥质(pelitic): 导源于泥质沉积物; (2)长英质(quartz-feldspathic): 包括砂岩、硅质凝灰岩和中酸性岩浆岩转变而来的变质岩; (3)钙质(calcareous): 导源于灰岩和白云岩(可含石英、粘土矿物...
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长英质片麻岩是太古宙变质杂岩区最主要的岩石类型。
Felsic gneiss is the most widely distributed rock type in Archean metamorphic complex areas.
在组分活性方面,镁铁质组分比长英质组分的活动更为明显。
As to the activity of the components, the mafic component is more active than the felsic component.
矿床的成矿时间、空间及其成因与长英质次火山岩关系密切;
The metallogenic time, space and genesis of the ore deposit is related closely to felsicsubvolcanic rocks.
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