| dbo:abstract |
في الجيولوجيا، الصخر البركاني المتحول (بالإنجليزية: Metavolcanic rock)، هو نوع من الصخور المتحولة الذي يتكوّن لأول مرة عن طريق البراكين، أو الحمم أو التيفرا. ثم تُدفن الصخرة لاحقاً وتتعرض لضغوط ودرجات حرارة عالية، مما يتسبب ذلك في إعادة تبلورها. الصخور البركاني المتحولة عادةً ما توجد في أحزمة الحجر الأخضر. الصخور البركانية المتحولة يمكن أن تحتوي على معادن مثل الكوارتز، الفلسبار، أمفيبول، البيروكسين. المعادن أقل شيوعا يمكن أن تشمل البيوتيت، العقيق، أكتينوليت، ، ، . (ar) Metavolcanic rock is volcanic rock that shows signs of having experienced metamorphism. In other words, the rock was originally produced by a volcano, either as lava or tephra. The rock was then subjected to high pressure, high temperature or both, for example by burial under younger rocks, causing the original volcanic rock to recrystallize. Metavolcanic rocks are sometimes described informally as metavolcanics. When it is possible to determine the original volcanic rock type from the properties of the metavolcanic rock (particularly if the degree of metamorphism is slight), the rock is more precisely named by appylying the prefix meta- to the original rock type. For example, a weakly metamorphosed basalt would be described as a metabasalt, or a weakly metamorphosed tuff as a metatuff. Metavolcanic rock is commonly found in greenstone belts. (en) |
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| rdfs:comment |
في الجيولوجيا، الصخر البركاني المتحول (بالإنجليزية: Metavolcanic rock)، هو نوع من الصخور المتحولة الذي يتكوّن لأول مرة عن طريق البراكين، أو الحمم أو التيفرا. ثم تُدفن الصخرة لاحقاً وتتعرض لضغوط ودرجات حرارة عالية، مما يتسبب ذلك في إعادة تبلورها. الصخور البركاني المتحولة عادةً ما توجد في أحزمة الحجر الأخضر. الصخور البركانية المتحولة يمكن أن تحتوي على معادن مثل الكوارتز، الفلسبار، أمفيبول، البيروكسين. المعادن أقل شيوعا يمكن أن تشمل البيوتيت، العقيق، أكتينوليت، ، ، . (ar) Metavolcanic rock is volcanic rock that shows signs of having experienced metamorphism. In other words, the rock was originally produced by a volcano, either as lava or tephra. The rock was then subjected to high pressure, high temperature or both, for example by burial under younger rocks, causing the original volcanic rock to recrystallize. Metavolcanic rocks are sometimes described informally as metavolcanics. Metavolcanic rock is commonly found in greenstone belts. (en) |
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Metavolcanic rock (en) صخر بركاني متحول (ar) |
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