sialn.

Brit.

/ˈsʌɪəl/, U.S.

/ˈsaɪˌæl/

Forms: Also Sial.

Etymology: < German sial, < si-licium silicon n. + al-uminium aluminium n. and adj.The name was altered < sal (see sal n.¹ 2) by G. Pfeffer in order to avoid confusion with other meanings of that word (see A. Wegener Die Entstehung der Kontinente und Ozeane (1920) iii. 22 and quot. 1924).

Geology.

The discontinuous upper layer of the earth's crust represented by the continental masses, which are composed of relatively light rocks rich in silica and alumina and may be regarded as floating on a lower crustal layer of sima; the material of which these masses are composed.

ΘΚΠ

the world > the earth > structure of the earth > [noun] > crust > parts of crust

oceanic crust1863

platform1880

sal1909

sima1909

sial1922

ocean crust1927

the world > the earth > structure of the earth > [adjective] > crust > parts of

oceanic1863

sial1922

simatic1922

the world > the earth > structure of the earth > constituent materials > [noun] > material of earth's crust

rock1671

mantle rock1896

sima1909

sial1922

asthenolith1929

pyrolite1962

1922 Geol. Mag. LIX. 338 Wegener accepts the terminology of Suess, except that he follows Pfeffer in writing Sial instead of Sal.

1923 Rep. Brit. Assoc. Advancem. Sci. 1922 364 Sial masses drift through the Sima like icebergs through the sea.

1924 J. G. A. Skerl tr. A. Wegener Orig. Continents & Oceans iii. 36 Following a short communication from Pfeffer I should like to write ‘Sial’ instead of ‘Sal’ in order that there may be no confusion with the Latin word for Salt.

1927 H. Peake & H. J. Fleure Apes & Men ii. 18 Various crises have led to the splitting of the Sial, and..its fragments have wandered off in many directions.

1950 P. H. Kuenen Marine Geol. ii. 118 The isostatic equilibrium of the crust requires a considerable thickness of granitic sial in the continents and a rock of greater density in the oceanic sections.

1954 R. L. Parker tr. P. Niggli Rocks & Mineral Deposits xi. 476 A granite~gneiss association takes the upper hand and is the reason for calling the entire outer crust the sial crust (sial or sal, containing Si and Al, besides alkalies, as the most important elements).

1978 D. Bridgwater et al. in D. H. Tarling Evol. Earth's Crust ii. 63 In the type of Archaean craton displayed in southern Africa break up and partial destruction of earlier sial probably took place in a different tectonic regime.

This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022).

单词	sial
释义	sialn. Brit. /ˈsʌɪəl/, U.S. /ˈsaɪˌæl/ Forms: Also Sial. Etymology: < German sial, < si-licium silicon n. + al-uminium aluminium n. and adj.The name was altered < sal (see sal n.¹ 2) by G. Pfeffer in order to avoid confusion with other meanings of that word (see A. Wegener Die Entstehung der Kontinente und Ozeane (1920) iii. 22 and quot. 1924). Geology. The discontinuous upper layer of the earth's crust represented by the continental masses, which are composed of relatively light rocks rich in silica and alumina and may be regarded as floating on a lower crustal layer of sima; the material of which these masses are composed. ΘΚΠ the world > the earth > structure of the earth > [noun] > crust > parts of crust oceanic crust1863 platform1880 sal1909 sima1909 sial1922 ocean crust1927 the world > the earth > structure of the earth > [adjective] > crust > parts of oceanic1863 sial1922 simatic1922 the world > the earth > structure of the earth > constituent materials > [noun] > material of earth's crust rock1671 mantle rock1896 sima1909 sial1922 asthenolith1929 pyrolite1962 1922 Geol. Mag. LIX. 338 Wegener accepts the terminology of Suess, except that he follows Pfeffer in writing Sial instead of Sal. 1923 Rep. Brit. Assoc. Advancem. Sci. 1922 364 Sial masses drift through the Sima like icebergs through the sea. 1924 J. G. A. Skerl tr. A. Wegener Orig. Continents & Oceans iii. 36 Following a short communication from Pfeffer I should like to write ‘Sial’ instead of ‘Sal’ in order that there may be no confusion with the Latin word for Salt. 1927 H. Peake & H. J. Fleure Apes & Men ii. 18 Various crises have led to the splitting of the Sial, and..its fragments have wandered off in many directions. 1950 P. H. Kuenen Marine Geol. ii. 118 The isostatic equilibrium of the crust requires a considerable thickness of granitic sial in the continents and a rock of greater density in the oceanic sections. 1954 R. L. Parker tr. P. Niggli Rocks & Mineral Deposits xi. 476 A granite~gneiss association takes the upper hand and is the reason for calling the entire outer crust the sial crust (sial or sal, containing Si and Al, besides alkalies, as the most important elements). 1978 D. Bridgwater et al. in D. H. Tarling Evol. Earth's Crust ii. 63 In the type of Archaean craton displayed in southern Africa break up and partial destruction of earlier sial probably took place in a different tectonic regime. This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022). < n.1922
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