phacolithn.

Brit.

/ˈfakəlɪθ/, U.S.

/ˈfækəˌlɪθ/

Origin: Formed within English, by compounding. Etymons: phaco- comb. form, -lith comb. form.

Etymology: < phaco- comb. form + -lith comb. form. Compare slightly earlier phacolite n. 2.

Geology.

An intrusive mass of igneous rock, typically lens-shaped, situated between consecutive strata at the top of an anticline or the bottom of a syncline.

ΘΚΠ

the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > intrusion > others

laccolite1877

xenolith1894

bysmalith1898

stock1898

autolith1900

bathylite1902

phacolite1909

phacolith1910

cupola1911

lopolith1918

1910 P. Lake & R. H. Rastall Text-bk. Geol. xiii. 225 These long narrow intrusions are called by Mr. Harker phacolites (more correctly phacoliths).

1939 Science 30 June 606/2 The Reservoir Hill phacolith near Gouverneur, eskers, kames, pro-glacial deltas and lake features were visited in the field.

1947 S. J. Shand Study of Rocks (ed. 2) ii. 16 The phacolith might be described as a saddle-shaped laccolith;..but there is this important difference between a laccolith and a phacolith that the former is the cause of the folding of its country rocks while the latter is a consequence of folding. [1931 (ed. 1) phacolite, laccolite.]

1971 B. W. Sparks Rocks & Relief iii. 93 Laccoliths are approximately circular, but phacoliths are not, except in the rare case of their being formed in a dome. Usually they are elongated in the direction of the axes of the folds.

1990 Canad. Jrnl. Earth Sci. 27 387 This pluton could be a syenite–diorite phacolith emplaced into a concordant zone of dilation during the late upright folding of the gneiss mass about horizontal axes.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	phacolith
释义	phacolithn. Brit. /ˈfakəlɪθ/, U.S. /ˈfækəˌlɪθ/ Origin: Formed within English, by compounding. Etymons: phaco- comb. form, -lith comb. form. Etymology: < phaco- comb. form + -lith comb. form. Compare slightly earlier phacolite n. 2. Geology. An intrusive mass of igneous rock, typically lens-shaped, situated between consecutive strata at the top of an anticline or the bottom of a syncline. ΘΚΠ the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > intrusion > others laccolite1877 xenolith1894 bysmalith1898 stock1898 autolith1900 bathylite1902 phacolite1909 phacolith1910 cupola1911 lopolith1918 1910 P. Lake & R. H. Rastall Text-bk. Geol. xiii. 225 These long narrow intrusions are called by Mr. Harker phacolites (more correctly phacoliths). 1939 Science 30 June 606/2 The Reservoir Hill phacolith near Gouverneur, eskers, kames, pro-glacial deltas and lake features were visited in the field. 1947 S. J. Shand Study of Rocks (ed. 2) ii. 16 The phacolith might be described as a saddle-shaped laccolith;..but there is this important difference between a laccolith and a phacolith that the former is the cause of the folding of its country rocks while the latter is a consequence of folding. [1931 (ed. 1) phacolite, laccolite.] 1971 B. W. Sparks Rocks & Relief iii. 93 Laccoliths are approximately circular, but phacoliths are not, except in the rare case of their being formed in a dome. Usually they are elongated in the direction of the axes of the folds. 1990 Canad. Jrnl. Earth Sci. 27 387 This pluton could be a syenite–diorite phacolith emplaced into a concordant zone of dilation during the late upright folding of the gneiss mass about horizontal axes. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1910
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