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Metapelites

Metapelites. Shales (Pelites): very fine-grained sedimentary rocks, composed of silicate clay minerals rich in the elements (SiO 2 , Al 2 O 3 , FeO, K 2 O, Na 2 O, H 2 O), beside other minor elements. Common metamorphic minerals include Quartz

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Metapelites

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  1. Metapelites • Shales (Pelites): very fine-grained sedimentary rocks, composed of silicate clay minerals rich in the elements (SiO2, Al2O3, FeO, K2O, Na2O, H2O), beside other minor elements. • Common metamorphic minerals include • Quartz • Feldspars (plagioclase, K-feldspars) • Mica (sericite, muscovite, biotite, chlorite) • garnet, • staurolite, • cordierite, • Al-silicate (andalusite, kyanite, silliminite) • Pyroxene

  2. Quartz

  3. Orthoclase

  4. Perthite

  5. Microcline

  6. Plagiocalse

  7. Chlorite

  8. Muscovite

  9. Biotite

  10. Garnet Group

  11. Staurolite

  12. Al-silicates

  13. Andalusite

  14. Kyanite

  15. 1. Sillimanite ( C )

  16. Cordierite

  17. Orthopyroxene

  18. Metacarbonate rocks • Limestone and dolomite (Calcareous rocks), composed essentially of calcite (CaCO3), doilomite (CaMg(CO3)2, with minor quartz and clay minerals. If the clay minerals are excess, the rock known as marl • the yielded rocks is known as Marble (mainly calcite) if the calcareous rocks are pure. In case of non-pure calcareous rocks, marble contain silicate minerals such as: wollastonite, grossular-andradite garnet, diopside and tremolite

  19. (a) Limestone (fiossiliferous)

  20. Calcite (CaCO3)

  21. Anthophyllite

  22. Metamorphosed sandstone • Sandstones (Arenaceous rocks): of variable composition, arenite (wholly quartz), arkose (quartz + feldspars) and graywackes (quartz, lithic fragment and clayey matrix) • Metamorphism of sandstone yield gneisses (quartz + plagioclase + K-feldspars + biotite + granet + Fe-Ti oxides) • Metamorphism of graywackes formed a metamorphic rocks intermediate between metapelites and gneisses) • Arenites yield quartizites

  23. Quartz Sandstone

  24. Metamorphosed basic igneous rocks • Basic rocks including basalts and gabbros, are low silica igneous rocks that contain plagioclase and pyroxene. • - Metamorphism of basic igneous rocks yielded metabasites (quartz, plagioclase, amphiboles, garnet, epidotes, chlorite) • - If the rock is composed of plagioclase and amphibole, amphibolites term are used • - At extreme P-T conditions, Eclogites are formed (garnet + omphacite)

  25. CPX: Diopside - Augite

  26. Omphacite

  27. Tremolite-actinolite

  28. Hornblende

  29. Glucophane

  30. Metamorphosed Ultramafic rocks • Ultramafic rocks, Mg-Fe rich silicate minerals (Diopside, Olivine) • When metamorphosed yielded produce serpentinites and talc schists with mineral assemblage include serpentine minerals, talc, enstatite, diopside, anthophyllite, tremolite, hornblende, garnets and chlorite

  31. Serpentine

  32. Talc

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