allochemicaladj.

Brit.

/ˌaləˈkɛmᵻkl/, U.S.

/ˌæləˈkɛmək(ə)l/

Origin: Formed within English, by compounding. Etymons: allo- comb. form, chemical adj.

Etymology: < allo- comb. form + chemical adj. In sense 1 after German allochemisch (P. Eskola in T. F. W. Barth et al. Die Entstehung der Gesteine (1939) iii. 264). With sense 2 compare allochem n.

Geology.

1. Of a metamorphic process: involving a change in the bulk chemical composition of a rock, through the introduction or removal of material.

ΚΠ

1948 F. J. Turner Mineral. & Struct. Evol. Metamorphic Rocks i. 3 With increasing metasomatic activity there is a transition from isochemical to allochemical metamorphism involving substantial addition or removal of material.

1991 Jrnl. Metamorphic Geol. 9 599/1 The transition between the areas of relatively isochemical and relatively allochemical behaviour appears to be controlled by deformation.

2007 Sedimentary Geol. 202 163/1 The metamorphism of the basin is considered as hydrothermal and allochemical.

2. Of the nature of an allochem; containing allochems. Cf. allochem n.

ΚΠ

1959 R. L. Folk in Bull. Amer. Assoc. Petroleum Geologists 43 4 Allochemical constituents, or ‘allochems’ include all materials that have been formed by chemical or biochemical precipitation within the basin of deposition, but which are organized into discrete aggregated bodies and for the most part have suffered some transportation.

1971 I. G. Gass et al. Understanding Earth i. 30/2 Allochemical rocks comprise about 15 per cent of all sediments and include shelly limestones and oolitic limestones among other types.

1992 Jrnl. Coastal Res. 8 594/1 The allochemical components (primarily shell gravel) are represented in the coarse sand to granule size range.

2002 Jrnl. Palaeontol. 76 811/1 Crinozoan detritus, articulate brachiopods, and stenolaemate bryozoans dominate the allochemical fractions of these rocks.

This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allochemical
释义	allochemicaladj. Brit. /ˌaləˈkɛmᵻkl/, U.S. /ˌæləˈkɛmək(ə)l/ Origin: Formed within English, by compounding. Etymons: allo- comb. form, chemical adj. Etymology: < allo- comb. form + chemical adj. In sense 1 after German allochemisch (P. Eskola in T. F. W. Barth et al. Die Entstehung der Gesteine (1939) iii. 264). With sense 2 compare allochem n. Geology. 1. Of a metamorphic process: involving a change in the bulk chemical composition of a rock, through the introduction or removal of material. ΚΠ 1948 F. J. Turner Mineral. & Struct. Evol. Metamorphic Rocks i. 3 With increasing metasomatic activity there is a transition from isochemical to allochemical metamorphism involving substantial addition or removal of material. 1991 Jrnl. Metamorphic Geol. 9 599/1 The transition between the areas of relatively isochemical and relatively allochemical behaviour appears to be controlled by deformation. 2007 Sedimentary Geol. 202 163/1 The metamorphism of the basin is considered as hydrothermal and allochemical. 2. Of the nature of an allochem; containing allochems. Cf. allochem n. ΚΠ 1959 R. L. Folk in Bull. Amer. Assoc. Petroleum Geologists 43 4 Allochemical constituents, or ‘allochems’ include all materials that have been formed by chemical or biochemical precipitation within the basin of deposition, but which are organized into discrete aggregated bodies and for the most part have suffered some transportation. 1971 I. G. Gass et al. Understanding Earth i. 30/2 Allochemical rocks comprise about 15 per cent of all sediments and include shelly limestones and oolitic limestones among other types. 1992 Jrnl. Coastal Res. 8 594/1 The allochemical components (primarily shell gravel) are represented in the coarse sand to granule size range. 2002 Jrnl. Palaeontol. 76 811/1 Crinozoan detritus, articulate brachiopods, and stenolaemate bryozoans dominate the allochemical fractions of these rocks. This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1948
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