epiclasticadj.

Brit.

/ˌɛpᵻˈklastɪk/, U.S.

/ˌɛpəˈklæstɪk/

Origin: Formed within English, by derivation. Etymons: epi- prefix, clastic adj.

Etymology: < epi- prefix + clastic adj. Compare earlier pyroclastic adj., and also cataclastic adj.

Geology.

Formed or consisting of fragments of pre-existing rock produced by processes occurring on the earth's surface, such as erosion or weathering; (also) designating the structure of a rock formed in this way. Contrasted with autoclastic adj., cataclastic adj., pyroclastic adj.

ΚΠ

1887 T. S. Hunt in Geol. Mag. 4 493 I venture to suggest that it [sc. the term ‘clastic’] should be applied to all rocks which consist largely of mineral fragments and that we should distinguish between the three types of clastic rocks at present recognized by using the terms epiclastic, cataclastic, and pyroclastic. Epiclastic—Rocks formed of fragments resulting from the breaking up of older rocks occurring upon the earth's surface.

1893 Q. Jrnl. Geol. Soc. 49 411 The account that I have given of the structure of this schist may throw light upon certain cases in which authors have asserted an epiclastic structure in schists.

1902 Canad. Rec. Sci. 8 199 The district also includes large tracts of country underlain by pyroclastic and epiclastic rocks.

1964 Marine Geol. 2 133 There is no fundamental difference between the mineralogy of the carbonate fraction of ‘non-carbonate’ or dominantly epiclastic sediments on the U. S. South Atlantic shelf and slope and that of essentially pure carbonate sediments from four areas.

2002 Jrnl. Petrol. 43 1826/2 It is in turn overlain by epiclastic deposits and the Poris Member.

This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022).

单词	epiclastic
释义	epiclasticadj. Brit. /ˌɛpᵻˈklastɪk/, U.S. /ˌɛpəˈklæstɪk/ Origin: Formed within English, by derivation. Etymons: epi- prefix, clastic adj. Etymology: < epi- prefix + clastic adj. Compare earlier pyroclastic adj., and also cataclastic adj. Geology. Formed or consisting of fragments of pre-existing rock produced by processes occurring on the earth's surface, such as erosion or weathering; (also) designating the structure of a rock formed in this way. Contrasted with autoclastic adj., cataclastic adj., pyroclastic adj. ΚΠ 1887 T. S. Hunt in Geol. Mag. 4 493 I venture to suggest that it [sc. the term ‘clastic’] should be applied to all rocks which consist largely of mineral fragments and that we should distinguish between the three types of clastic rocks at present recognized by using the terms epiclastic, cataclastic, and pyroclastic. Epiclastic—Rocks formed of fragments resulting from the breaking up of older rocks occurring upon the earth's surface. 1893 Q. Jrnl. Geol. Soc. 49 411 The account that I have given of the structure of this schist may throw light upon certain cases in which authors have asserted an epiclastic structure in schists. 1902 Canad. Rec. Sci. 8 199 The district also includes large tracts of country underlain by pyroclastic and epiclastic rocks. 1964 Marine Geol. 2 133 There is no fundamental difference between the mineralogy of the carbonate fraction of ‘non-carbonate’ or dominantly epiclastic sediments on the U. S. South Atlantic shelf and slope and that of essentially pure carbonate sediments from four areas. 2002 Jrnl. Petrol. 43 1826/2 It is in turn overlain by epiclastic deposits and the Poris Member. This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022). < adj.1887
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