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      Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with alkali feldspar making up less than 10% of the total feldspar content. Quartz (SiO2) is present as more than 20% of the total quartz-alkali feldspar-plagioclase-feldspathoid (QAPF) content of the rock. Amphiboles and biotite are common in lesser quantities, while accessory minerals include apatite, magnetite and zircon.
      In older references tonalite is sometimes used as a synonym for quartz diorite. However the current IUGS classification defines tonalite as having greater than 20% quartz, while quartz diorite varies its quartz content from 5 to 20%.
      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. The name was first applied by Gerhard vom Rath in 1864. The term adamellite was originally applied by A. Cathrein in 1890 to orthoclase-bearing tonalite (likely a granodiorite) at Monte Adamello, Italy, in 1890, but later came to refer to quartz monzonite, and is now a deprecated term.
      Trondhjemite is an orthoclase-deficient variety of sodium-rich tonalite with minor biotite as the only mafic mineral, named after Norway's third largest city, Trondheim.
      Tonalites, together with granodiorites, are characteristic of calc-alkaline batholiths formed above subduction zones.


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    Tonalite - Alchetron, The Free Social Encyclopedia

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    Tonalite: Key Things to Learn this Granitoid | Geology Base

    Tonalite: Key Things to Learn this Granitoid | Geology Base

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    Tonalite - Wikipedia

    Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with alkali feldspar making up less than 10% of the total feldspar content.

    Tonalite : Properties, Composition, Occurrence, Uses - Geology …

    Nov 17, 2023 · Tonalite is a type of intrusive igneous rock that belongs to the granodiorite suite of rocks. It is characterized by its composition, which is intermediate between granite and diorite. Tonalite is part of the larger family of plutonic rocks, which means that it forms from the slow cooling and solidification of magma beneath the Earth's surface.

    Tonalite–trondhjemite–granodiorite - Wikipedia

    Tonalite–trondhjemite–granodiorite (TTG) rocks are intrusive rocks with typical granitic composition (quartz and feldspar) but containing only a small portion of potassium feldspar. Tonalite, trondhjemite, and granodiorite often occur together in geological records, indicating similar petrogenetic processes. [1]

    Tonalite – Geology is the Way

    Tonalite is a type of plutonic igneous rock containing quartz (20 – 60% of the felsic minerals) and abundant plagioclase. K-feldspar is rare or absent in a tonalite and, when present, it constitutes less than 10% of the feldspars.

    Tonalite: Key Things to Learn this Granitoid - Geology Base

    Sep 7, 2023 · Tonalite is a coarse-grained, light-colored intermediate to mafic plutonic rock with mainly plagioclase, quartz, and minor mafic minerals.

    Tonalite, Diorite, Gabbro, Norite, and Anorthosite

    TONALITE - Intrusive igneous, plutonic. Sometimes mistakenly used as synonymous with quartz diorite. The rock contains essential quartz, and plagioclase feldspar, usually andesine, with accessory mafics such as biotite, hornblende, and/ or …

    Tonalite: Mineral information, data and localities. - mindat.org

    A granitoid (a coarse grained igneous rock with <90% mafics; felsic minerals are composed mostly of quartz (20-60%) and 40-80% feldspars (Kspar (alkali-feldspar) and plagioclase), where plagioclase is >90% of the total feldspar as shown on the QAPF diagram. Tonalite is in section 5 of the QAPF diagram. A petrological term for Pyroxene Group.

    Tonalite - ALEX STREKEISEN

    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).

    Tonalite - an overview | ScienceDirect Topics

    Tonalite (named by pass Tonale, Adamello massif in Tirol) is a felsic igneous plutonic rock with phaneritic texture and special variety of granodiorite in turn to diorite. From: Introduction to Mineralogy and Petrology , 2014

    Tonalite Rock | History | Origin - Compare Nature

    Tonalite is a coarse-grained plutonic rock consisting mainly of sodic plagioclase, quartz, and hornblende or other mafic minerals with phaneritic texture. Tonalite is available in black, brown, light to dark grey, white colors.