protolithn.

Brit.

/ˈprəʊtə(ʊ)lɪθ/, U.S.

/ˈproʊdoʊˌlɪθ/,

/ˈproʊdəˌlɪθ/

Origin: Formed within English, by compounding. Etymons: proto- comb. form, -lith comb. form.

Etymology: < proto- comb. form + -lith comb. form. Compare earlier protolithic adj.

Geology.

The parent rock from which a given metamorphic rock developed.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > source material

protolith1960

1960 Bull. Geol. Soc. Amer. 71 531 Two contrasting intergradational lithic assemblages..characterize the protolith of the bedded rocks.

1974 Nature 15 Mar. 199/1 This investigation attempts to decipher the premetamorphic age of the protolith of a recrystallised breccia from Apollo 16.

1990 Jrnl. Petrol. 31 719 The data that we present suggest that the protoliths of these rocks were plagioclase-rich, low-pressure fractionation products.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protolith
释义	protolithn. Brit. /ˈprəʊtə(ʊ)lɪθ/, U.S. /ˈproʊdoʊˌlɪθ/, /ˈproʊdəˌlɪθ/ Origin: Formed within English, by compounding. Etymons: proto- comb. form, -lith comb. form. Etymology: < proto- comb. form + -lith comb. form. Compare earlier protolithic adj. Geology. The parent rock from which a given metamorphic rock developed. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > source material protolith1960 1960 Bull. Geol. Soc. Amer. 71 531 Two contrasting intergradational lithic assemblages..characterize the protolith of the bedded rocks. 1974 Nature 15 Mar. 199/1 This investigation attempts to decipher the premetamorphic age of the protolith of a recrystallised breccia from Apollo 16. 1990 Jrnl. Petrol. 31 719 The data that we present suggest that the protoliths of these rocks were plagioclase-rich, low-pressure fractionation products. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1960
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