Tonalite

Tonalite is an intermediate igneous rock with essential quartz (>20%) and plagioclase feldspar (oligoclase or andesine), mafic minerals (biotite, pyroxene, hornblende,) and minor alkali feldspar (<10% vol). The name is derived from the type locality of tonalites, adjacent to the Tonale Line, a major structural lineament and mountain pass, Tonale Pass, in the Italian and Austrian Alps.

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QAPF Diagram Tonalite field in blue



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Tonalite Sample.




Bibliography



• Eric A.K.Middlemost (1985): Magmas and Magmatic Rocks. Longman, London
• Ron H. Vernon (2004): A pratical guide to rock microstructure. Cambridge editore
• K.G.Cox, J.D.Bell & R.J Pankhurst (1979): The interpretetion of igneous rocks. George Allen&Unwin editori.
• David Shelley (1983): Igneous and metamorphic rocks under the microscope. Campman & Hall editori


Photo
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Plagioclase, quartz and Biotite in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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chloritized biotite and secondary Epidotes in una tonalite, halkidiki (Grecia). PPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz, chloritized biotite and secondary Epidotes in una tonalite, halkidiki (Grecia). PPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz and Biotite in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz and Biotite in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz and Biotite in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz and pyroxene in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Plagioclase, quartz and Biotite in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Plagioclase and quartz in a Tonalite, halkidiki (Grecee). XPL image, 2x (Field of view = 7mm)
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Clinopyroxene and chloritized biotite in a Tonalite, halkidiki (Grecee). PPL image, 2x (Field of view = 7mm)
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Clinopyroxene and chloritized biotite in a Tonalite, halkidiki (Grecee). PPL image, 2x (Field of view = 7mm)
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Hornblende and plagioclase in a tonalite, Antarctica. XPL image, 2x (Field of view = 7mm)
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Hornblende and plagioclase in a tonalite, Antarctica. XPL image, 2x (Field of view = 7mm)
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Hornblende and plagioclase in a tonalite, Antarctica. XPL image, 2x (Field of view = 7mm)
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Hornblende and plagioclase in a tonalite, Antarctica. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase (colorless) crystals in a tonalite from Adamello massif, Italy. PPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase (colorless) crystals in a tonalite from Adamello massif, Italy. PPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase (colorless) crystals in a tonalite from Adamello massif, Italy. PPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)
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Biotite and plagioclase crystals in a tonalite from Adamello massif, Italy. XPL image, 2x (Field of view = 7mm)