allochthonousadj.

Brit.

/əˈlɒkθənəs/, U.S.

/əˈlɑkθənəs/,

/æˈlɑkθənəs/

Forms: 1800s– allochthonous, 1800s– allocthonous, 1900s– allochtonous.

Origin: A borrowing from German, combined with an English element. Etymons: German allochthon , -ous suffix.

Etymology: < German allochthon ( K. W. von Gümbel Grundzüge der Geol. (1888) I. ii. v. 615) < allo- allo- comb. form + ancient Greek χθον- , χθών earth, soil: see chthonic adj.) + -ous suffix. Compare autochthonous adj. 3.

Geology.

Of a rock formation, sedimentary deposit, etc.: consisting of or formed from transported material which was originally accumulated elsewhere; not formed in situ. Also: of or relating to such a formation, deposit, etc. Contrasted with autochthonous adj. 3. Cf. allochthon n.

ΘΚΠ

the world > the earth > structure of the earth > structural features > [adjective] > by origin in place

residual1876

allochthonous1888

authigenic1888

authigenous1889

autochthonous1891

parautochthonous1927

1888 Ann. Bot. 1 377 The question of the origin of coal, the modified allocthonous [sic] view of Grand-Eury being that to which the author inclines.

1911 E. A. N. Arber Nat. Hist. Coal v. 110 The alternative hypothesis of the Drift theory or Allochthonous formation of coal as Gümbel termed it.

1916 Bot. Gaz. 62 33 Allochthonous peat (that type of peat which has been deposited by a gradual accumulation of floated, drifted, and windblown vegetable material in permanent and more or less quiet bodies of open water).

1932 J. A. Steers Unstable Earth iii. 114 Nappes characteristic of the true geosyncline which have often been moved far from their place of origin, and to which the term allochthonous is applied.

1977 Offshore Engineer May 38/1 South of the Alpine Arc, allochthonous sediments (not formed in situ) were thrust over the carbonate platform in successive fronts from Upper Cretaceous to Recent times.

1982 Sci. Amer. Aug. 110/1 Today almost all ophiolite masses are regarded as being allochthonous.

2006 A. G. van der Valk Biol. Freshwater Wetlands v. 100 Wetlands..continue to collect or channel water even as they fill in with allochthonous or autochthonous sediment.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allochthonous
释义	allochthonousadj. Brit. /əˈlɒkθənəs/, U.S. /əˈlɑkθənəs/, /æˈlɑkθənəs/ Forms: 1800s– allochthonous, 1800s– allocthonous, 1900s– allochtonous. Origin: A borrowing from German, combined with an English element. Etymons: German allochthon , -ous suffix. Etymology: < German allochthon ( K. W. von Gümbel Grundzüge der Geol. (1888) I. ii. v. 615) < allo- allo- comb. form + ancient Greek χθον- , χθών earth, soil: see chthonic adj.) + -ous suffix. Compare autochthonous adj. 3. Geology. Of a rock formation, sedimentary deposit, etc.: consisting of or formed from transported material which was originally accumulated elsewhere; not formed in situ. Also: of or relating to such a formation, deposit, etc. Contrasted with autochthonous adj. 3. Cf. allochthon n. ΘΚΠ the world > the earth > structure of the earth > structural features > [adjective] > by origin in place residual1876 allochthonous1888 authigenic1888 authigenous1889 autochthonous1891 parautochthonous1927 1888 Ann. Bot. 1 377 The question of the origin of coal, the modified allocthonous [sic] view of Grand-Eury being that to which the author inclines. 1911 E. A. N. Arber Nat. Hist. Coal v. 110 The alternative hypothesis of the Drift theory or Allochthonous formation of coal as Gümbel termed it. 1916 Bot. Gaz. 62 33 Allochthonous peat (that type of peat which has been deposited by a gradual accumulation of floated, drifted, and windblown vegetable material in permanent and more or less quiet bodies of open water). 1932 J. A. Steers Unstable Earth iii. 114 Nappes characteristic of the true geosyncline which have often been moved far from their place of origin, and to which the term allochthonous is applied. 1977 Offshore Engineer May 38/1 South of the Alpine Arc, allochthonous sediments (not formed in situ) were thrust over the carbonate platform in successive fronts from Upper Cretaceous to Recent times. 1982 Sci. Amer. Aug. 110/1 Today almost all ophiolite masses are regarded as being allochthonous. 2006 A. G. van der Valk Biol. Freshwater Wetlands v. 100 Wetlands..continue to collect or channel water even as they fill in with allochthonous or autochthonous sediment. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1888
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