| 单词 | allochthonous |
| 释义 | allochthonous, a. Geol.|æˈlɒkθənəs|
[f. G. allochthon (K. W. von Gümbel 1888, in Grundzüge d. Geologie I. ii. v. 615), f. allo- + χθών, χθονός earth, soil: see -ous.]
Applied to organic deposits and rock formations: consisting of or formed from transported material; not formed in situ (opp. autochthonous a. c).
1911E. A. N. Arber Nat. Hist. Coal v. 110 We now turn to the alternative hypothesis of the Drift theory or Allochthonous formation of coal as Gümbel termed it... The material, which formed the mother substance of coal seams, was, on this view, always drifted..and transported from a distance. 1916C. C. Forsaith in Bot. Gaz. LXII. 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). 1932J. 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. 1939W. H. Twenhofel Princ. Sedimentation v. 162 Before fossil plants may be used to reconstruct a physical environment it must first be determined whether the plant material is autochthonous, that is, whether it grew where it is found; or allochthonous, that is, whether it was transported to where it is found. 1942,1961[see prec.]. |
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