Lecture twelve metamorphism of ultramafic rocks metaultramafics
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Lecture TWELVE Metamorphism of Ultramafic rocks (Metaultramafics). What is the Metaultramafics?. Metaultramafics , are metamorphosed ultramafic igneous rocks. Ultramafic rocks are generated in the upper mantle and composed of <90% mafic minerals , which include:

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Lecture twelve metamorphism of ultramafic rocks metaultramafics
Lecture TWELVE Metamorphism of Ultramafic rocks(Metaultramafics)


What is the metaultramafics
What is the Metaultramafics?

  • 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)2SiO4,

  • Orthopyroxene (Opx) (Mg,Fe)SiO3 and

  • Clinopyroxene (Cpx) Ca(Mg,Fe)Si2O6

  • 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 (SiO2, MgO, FeO, CaO)


Mineralogy of metaultramafics
Mineralogy of Metaultramafics

  • Metaultramafics contain the following mineral assemblage:

  • Talc

  • Serpentine

  • Olivine + H2O = serpentine

  • Mg2SiO4 + H2O = Mg3Si2O5(OH)4

  • Anthophyllite

  • Olivine

  • Pyroxene


1 rock types of the metamorphosed ultramafic rocks
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.

    - Peridotites: Olivine bearing ultrmafics


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