中性岩(intermediate rock)是指SiO2含量中等(52%~65%)的岩浆岩。矿物成分的特点是浅色矿物含量比基性岩高,暗色矿物含量比基性岩低,色率为20~35;浅色矿物以长石族矿物为主,不含或含少量石英,偶含少量似长石;暗色矿物以角闪石为主,其次为辉石和黑云母。中性岩很少形成独立岩体,常与酸性岩或基性岩共生过渡。
...先,根据火成岩的SiO2含量,可以将火成岩分成超基性岩(ultrabasic rock)、基性岩(basic rock)、中性岩(intermediate rock)及酸性岩(acidic rock)。它们分别相当于四种基本岩浆类型。
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山门银矿区出露的中生代侵入岩是一套由基性岩、中性岩、酸性岩组成的复式侵入体。具有规模大、侵入期次多、演化时间长的特点。
The outcropped Mesozoic intrusive rock is a composite intrusion which consists of basic, intermediate and acid rocks, characterized by the large scale, multiphase intrusion, and with long evolution.
大型玄武岩标志的中性地板不会干扰内部空间的视觉特性。
The neutral floor of large basalt flags does not interfere with the visual nature of the interiors.
研究区内火山岩从基性—中性—中酸性都有出露,包括橄榄玄武岩、安山岩和英安岩,且都属于非碱性系列。
The volcanic rocks in the study area all belong to sub alkaline series including olivine basalt, andesite and dacite, from basic to intermediate, and to acid.
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