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Meta-igneous rocks

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Mapa Mental sobre Meta-igneous rocks, criado por zotalia em 10-03-2014.
zotalia
Mapa Mental por zotalia, atualizado more than 1 year ago
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Criado por zotalia quase 12 anos atrás
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Resumo de Recurso

Meta-igneous rocks
  1. Metamorphic facies
    1. Greenschist
      1. chlorite, albite, actionlite, epidote, quartz
        1. chlorite + green amphibole
        2. Amphibolite
          1. green amphibole (hornblende = dark green/black amphibole), garnet, plag
          2. Hornfels
            1. Sanidinite
              1. Eclogite
                1. high density - transformation of blue schist into something denser and loss of hydrous minerals.
                  1. green/red colours diagnostic - green pyroxene (jadeite) and garnet
                  2. Granulite
                    1. with increasing T, amphibole breaks down to produce pyroxenes: clino and ortho
                      1. represent unusually hot conditions - greater T than associated with their depth of formation so thought to be formed with crustal thickening and excess heating
                        1. no hydrous mineral phases - represents deep burial and dehydrated roots of continental crust
                          1. pyx, garnet/plag
                          2. Epidote-amphibolite
                            1. epidote + green amphibole
                            2. Blueschist
                              1. Grown under v high pressures - subduction zones
                                1. characterised by sonic blue amphibole = glaucophane
                                2. Greenschist --> amphibolite --> granulite corresponds to typical continental geotherm
                                  1. most common facies dries of regional metamorphism - equivalent to classical Barrovian series
                                3. Hydration of original mafic minerals needed to generate mm mineral assemblages for most facies
                                  1. w/o H2O most igneous rocks will be unaffected whilst surrounding sediments will be metamorphosed
                                    1. coarse-grained intrusions of gabbro are most resistant - low H2O content whilst basalts are most susceptible
                                    2. not much difference between low-P metabolites and med-P
                                      1. distinguish between contact mm facies and medium-pressure regional mm facies if 1) metapelites are present (regional) 2) textures etc
                                      2. metasediments (and barrow zones) tend to give more information that metamorphic facies

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