Summary
Zusammenfassung Magmatite
- Course
- Institution
Auflistung verschiedener Magmatite in Tabellenform mit Beschreibung des Mineralbestands, sowie der Entstehung und dem Vorkommen.
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MagmatiteEinteilung:
Sauer Intermediär Basisch Ultrabasisch
Gew.-% SiO2 > 63% 63-52% 52-45% < 45%
Vulanite Rhyolith Andesit Basalt Komatiite
Plutonite Granit Diorit Gabbro Peridotit
Farbzahl < 90 < 90 < 90 > 90
Zunahme an Mg, Ca und Fe
Zunahme an Na und K
Zunahme der Schmelztemperatur
Zunahme der Viskosität
Farbzahl > 90 → Olivin, Pyroxen
- Mantelgesteine → kein Platz für OH-Gruppen, hoher Druck, deswegen
Pyroxene (Amphibol enthält OH-Gruppe, deswegen eher nicht in
ultramafischen Gesteinen)
Peridotit (Lherzolit):
0-5 % 5-10 % 10-25 % 30-60%
Schmelze Ol-Nephelinit, Alkalibasalt Ozean. Tholeiit Piktrit, Komatiit
basaltisch (MOR)
Resttit Lherzolit Lherzolit Harzburgit Dunit (Archaikum,
früher Mantel bis
zu 500°C warm)
Ozeanische Kruste / Mantel (Lithosphäre)
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