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词汇 Granite porphyry
分类 英语词汇 英语翻译词典
释义

Granite porphyry

中文百科

斑岩 Porphyry (geology)

(重定向自Granite porphyry)
用斑岩建造的教堂门
Una pieza de pórfido.
Textura porfírica en un granito; los fenocristales de feldespato son más grandes que los cristales en la matriz circundante; este Sierra Nevada, Cañón Rock Creek, California. Escala: 2 cm.
Rhyolite porphyry.  Scale bar in lower left is 1 cm.

斑岩,旧称玢岩,是具有斑状结构的火成岩,比较坚固,可用于做建筑材料。斑晶一般由碱性长石或石英组成,基质为细粒或隐晶(玻璃体)。

斑岩一部分属于火成岩中的喷出岩,但一般属于火成岩中的浅成岩。喷出岩是火山岩浆喷出后冷凝形成的,由于喷出后冷却很快,形成许多细粒;浅成岩是火山岩浆侵入地壳浅层(一般为1.5-3千米)冷凝形成的,有许多结晶斑粒:

喷出岩

浅成岩

英语百科

Porphyry (geology) 斑岩

(重定向自Granite porphyry)
A piece of porphyry
Rhyolite porphyry.  Scale bar in lower left is 1 cm.
Diagram of zonation in a porphyry copper deposit
 The Tetrarchs, a porphyry sculpture sacked from the Byzantine Philadelphion palace in 1204, Treasury of St. Marks, Venice

Porphyry is a textural term for an igneous rock consisting of large-grained crystals such as feldspar or quartz dispersed in a fine-grained feldspathic matrix or groundmass. The larger crystals are called phenocrysts. In its non-geologic, traditional use, the term porphyry refers to the purple-red form of this stone, valued for its appearance.

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