allochemn.

Brit.

/ˈaləkɛm/, U.S.

/ˈæləˌkɛm/

Origin: Formed within English, by clipping or shortening. Etymon: allochemical adj.

Etymology: Shortened < allochemical adj. (compare quot. 1959).

Geology.

Any of various coarse particles (as skeletal fragments, ooliths, pellets, carbonate clasts, etc.) which have become incorporated in, and provide a framework for, certain mechanically deposited sedimentary rocks.

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.

1970 K. C. Jackson Textbk. Lithol. vi. 401 The proportion of micrite in limestone varies from a minor interstitial filling between allochems to the entire rock.

1991 Palaios 6 56 (caption) The microbialite..is formed of micrite (white) that contains numerous peloids and skeletal allochems (black dots throughout micrite).

2001 M. L. Droser & X. Li in A. Yu. Zhuralev & R. Riding Ecol. Cambrian Radiation vii. 153 Cambrian shell concentrations consist of skeletal grains and of nonskeletal allochems such as intraclasts, peloids, ooids, oncoids, and sedimentary matrix.

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

单词	allochem
释义	allochemn. Brit. /ˈaləkɛm/, U.S. /ˈæləˌkɛm/ Origin: Formed within English, by clipping or shortening. Etymon: allochemical adj. Etymology: Shortened < allochemical adj. (compare quot. 1959). Geology. Any of various coarse particles (as skeletal fragments, ooliths, pellets, carbonate clasts, etc.) which have become incorporated in, and provide a framework for, certain mechanically deposited sedimentary rocks. 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. 1970 K. C. Jackson Textbk. Lithol. vi. 401 The proportion of micrite in limestone varies from a minor interstitial filling between allochems to the entire rock. 1991 Palaios 6 56 (caption) The microbialite..is formed of micrite (white) that contains numerous peloids and skeletal allochems (black dots throughout micrite). 2001 M. L. Droser & X. Li in A. Yu. Zhuralev & R. Riding Ecol. Cambrian Radiation vii. 153 Cambrian shell concentrations consist of skeletal grains and of nonskeletal allochems such as intraclasts, peloids, ooids, oncoids, and sedimentary matrix. This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.1959
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