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Tonalite is an igneous, plutonic 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.
In some literature, tonality is a generic term applied to pre-modern music, referring to the eight modes of the Western church, implying that important historical continuities underlie music before and after the emergence of the common practice period around 1600, with the difference between tonalité ancienne (before 1600) and tonalité ...
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 ]
Trondhjemite is a leucocratic (light-colored) intrusive igneous rock.It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase. [1] Trondhjemites that occur in the oceanic crust or in ophiolites are usually called plagiogranites.
According to the QAPF diagram, granodiorite has a greater than 20% quartz by volume, and between 65% and 90% of the feldspar is plagioclase. A greater amount of plagioclase would designate the rock as tonalite.
In 1995, Ira Braus argued that the final sequence of Franz Liszt's 1885 piano piece Bagatelle sans tonalité could be continued to produce a Shepard scale using Hofstadter's technique. [14] In a 1967 AT&T film by Shepard and E. E. Zajac, a Shepard tone accompanies the ascent of an analogous Penrose stair. [15]
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Bagatelle sans tonalité ("Bagatelle without tonality", S.216a) is a piece for solo piano written by Franz Liszt in 1885. The manuscript bears the title "Fourth Mephisto Waltz" [1] and may have been intended to replace the piece now known as the Fourth Mephisto Waltz when it appeared Liszt would not be able to finish it; the phrase Bagatelle ohne Tonart actually appears as a subtitle on the ...