tonaliten.

/ˈtɒnəlʌɪt/

Etymology: < German tonalit (G. vom Rath 1864, in Zeitschr. der deutsch. geol. Ges. XVI. 249).

Mineralogy.

Originally: a particular variety of quartz-diorite; later used for any quartz-diorite. Now spec. a rock in which quartz represents 20–60 per cent of quartz plus feldspars (a higher proportion than in quartz-diorite) and alkali feldspar is less than 10 per cent of total feldspars.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > other plutonics

dunite1859

napoleonite1866

corsite1876

tonalite1879

trout-stone1892

granodiorite1893

adamellite1896

syenodiorite1917

microdiorite1920

trondhjemite1922

1879 F. Rutley Study of Rocks xii. 244 The rock termed tonalite by Vom Rath, which occurs in the Tonale Pass in the Tyrol,..formerly regarded as a variety of granite, is a micaceous quartz-diorite.

1885 C. Lyell Elem. Geol. (ed. 4) 571 Tonalite..consists of quartz, oligoclase, and hornblende.

1913 Jrnl. Geol. (Chicago) 21 213 Lindgren has defined tonalite (or quartz diorite), as containing less than 8 per cent of alkali feldspar, granodiorite as containing 8–20 per cent of alkali feldspar.

1932 A. Johannsen Descr. Petrogr. Igneous Rocks II. 379 Diorites with less than 5 per cent of quartz may be called quartz-bearing-diorites. With more than 5 per cent, they become quartz-diorites (tonalites).

1962 W. T. Huang Petrol. iv. 91 From granite, granodiorite, tonalite to diorite, the proportional amounts of quartz and alkalic feldspar decrease, while that of sodic plagioclase increases.

1976 Earth-Sci. Rev. XII. 14 For field 5 the term tonalite is recommended, whether hornblende is present or not, in agreement with Johannsen..; whereas quartz diorite, frequently used for this field, is restricted to field 10*.

1976 Earth-Sci. Rev. XII. 27 20–60% of light-colored minerals... Plag 90–100% of total feldspar: (5) tonalite.

1977 Sci. Amer. Mar. 94/1 The average chemical composition [of gneisses] resembles that of the common igneous rocks diorite and tonalite.

Derivatives

tonaˈlitic adj.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > plutonic > other plutonics

peridotitic1886

tonalitic1963

1963 Revista de la Asociación Geológica Argentina XVIII. 97 In the Pampean Ranges, tungsten ore deposits are related to tonalitic-granitic intrusives of the pre-Cambrian tectomagmatic cycle.

1978 Nature 16 Mar. 241/1 Although the gneiss belts show great structural complexity..granodioritic and tonalitic compositions greatly predominate.

This entry has not yet been fully updated (first published 1913; most recently modified version published online March 2019).

单词	tonalite
释义	tonaliten. /ˈtɒnəlʌɪt/ Etymology: < German tonalit (G. vom Rath 1864, in Zeitschr. der deutsch. geol. Ges. XVI. 249). Mineralogy. Originally: a particular variety of quartz-diorite; later used for any quartz-diorite. Now spec. a rock in which quartz represents 20–60 per cent of quartz plus feldspars (a higher proportion than in quartz-diorite) and alkali feldspar is less than 10 per cent of total feldspars. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > other plutonics dunite1859 napoleonite1866 corsite1876 tonalite1879 trout-stone1892 granodiorite1893 adamellite1896 syenodiorite1917 microdiorite1920 trondhjemite1922 1879 F. Rutley Study of Rocks xii. 244 The rock termed tonalite by Vom Rath, which occurs in the Tonale Pass in the Tyrol,..formerly regarded as a variety of granite, is a micaceous quartz-diorite. 1885 C. Lyell Elem. Geol. (ed. 4) 571 Tonalite..consists of quartz, oligoclase, and hornblende. 1913 Jrnl. Geol. (Chicago) 21 213 Lindgren has defined tonalite (or quartz diorite), as containing less than 8 per cent of alkali feldspar, granodiorite as containing 8–20 per cent of alkali feldspar. 1932 A. Johannsen Descr. Petrogr. Igneous Rocks II. 379 Diorites with less than 5 per cent of quartz may be called quartz-bearing-diorites. With more than 5 per cent, they become quartz-diorites (tonalites). 1962 W. T. Huang Petrol. iv. 91 From granite, granodiorite, tonalite to diorite, the proportional amounts of quartz and alkalic feldspar decrease, while that of sodic plagioclase increases. 1976 Earth-Sci. Rev. XII. 14 For field 5 the term tonalite is recommended, whether hornblende is present or not, in agreement with Johannsen..; whereas quartz diorite, frequently used for this field, is restricted to field 10. 1976 Earth-Sci. Rev.* XII. 27 20–60% of light-colored minerals... Plag 90–100% of total feldspar: (5) tonalite. 1977 Sci. Amer. Mar. 94/1 The average chemical composition [of gneisses] resembles that of the common igneous rocks diorite and tonalite. Derivatives tonaˈlitic adj. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > plutonic > other plutonics peridotitic1886 tonalitic1963 1963 Revista de la Asociación Geológica Argentina XVIII. 97 In the Pampean Ranges, tungsten ore deposits are related to tonalitic-granitic intrusives of the pre-Cambrian tectomagmatic cycle. 1978 Nature 16 Mar. 241/1 Although the gneiss belts show great structural complexity..granodioritic and tonalitic compositions greatly predominate. This entry has not yet been fully updated (first published 1913; most recently modified version published online March 2019). < n.1879
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