Lecture TWELVE Metamorphism of Ultramafic rocks Lecture TWELVE Metamorphism of Ultramafic rocks (Metaultramafics)

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Presentation transcript:

Lecture TWELVE Metamorphism of Ultramafic rocks Lecture TWELVE Metamorphism of Ultramafic rocks (Metaultramafics)

What is the Metaultramafics?  Metaultramafics are metamorphosed ultramafic igneous rocks.  Metaultramafics, are metamorphosed ultramafic igneous rocks.  Ultramafic rocks are generated in the upper mantle and composed of <90% mafic minerals, which include: - Olivine (Ol) (Mg,Fe) 2 SiO 4, - Orthopyroxene (Opx) (Mg,Fe)SiO 3 and - Clinopyroxene (Cpx) Ca(Mg,Fe)Si 2 O 6 and comprises rocks such as: - Dunite (Ol), Pyroxenite (Cpx+Opx), Peridotite (Cpx+Opx+Ol) include harzburgite (Ol+Opx) and lherzolite (Ol+Cpx).  Chemically, the Utramafic chemical system of the ultramafic is simple (SiO 2, MgO, FeO, CaO)

Mineralogy of Metaultramafics Metaultramafics contain the following mineral assemblage: Metaultramafics contain the following mineral assemblage:  Talc  Serpentine Olivine + H 2 O = serpentine Mg 2 SiO4 + H 2 O = Mg 3 Si2O 5 (OH) 4 Mg 2 SiO4 + H 2 O = Mg 3 Si2O 5 (OH) 4  Anthophyllite  Olivine  Pyroxene

1- Rock types of the metamorphosed ultramafic rocks  The rock types of the metamorphosed ultramafic rocks are usually mono-mineralic and include: - Serpentintes: a massive to schistose rock with abundant serpentine minerals. - Talc fels / talc schist: Talc rich foliated/non-foliated rocks - Ophicalcites: serpentine + carbonate calcite - Anthophyllite schist. - Anthophyllite schist. - Peridotites: Olivine bearing ultrmafics