porphyroblasticadj.

Brit.

/ˌpɔːfᵻrə(ʊ)ˈblastɪk/, U.S.

/ˈˌpɔrfəroʊˈblæstɪk/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: porphyro- comb. form, -blastic comb. form.

Etymology: < porphyro- comb. form + -blastic comb. form, after German porphyroblastisch (F. Becke 1904, in Congr. Géol. Internat.: Comptes Rendus 9me Sess. 1903 II. 570). Compare porphyroblast n.

Geology.

Of a rock or its texture: marked by the presence of porphyroblasts. Also: occurring in the form of porphyroblasts.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > texture > embedded crystals

ophitical1611

ophitic1870

poikilitic1886

hyalopilitic1888

miarolitic1889

hyalo-ophitic1920

poikiloblastic1920

porphyroblastic1920

porphyroclastic1920

1920 A. Holmes Nomencl. Petrol. 188 Porphyroblast,..a term given to the pseudo-porphyritic crystals of rocks produced by thermodynamic metamorphism. The corresponding texture is called porphyroblastic.

1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) x. 229 (caption) Porphyroblastic garnet (and staurolite) in muscovite schist.

1991 Ann. Rep. Brit. Geol. Surv. 1990–91 48 Later ductile shearing on the granite contact has produced a sequence of porphyroblastic gneisses and mylonites.

This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).

单词	porphyroblastic
释义	porphyroblasticadj. Brit. /ˌpɔːfᵻrə(ʊ)ˈblastɪk/, U.S. /ˈˌpɔrfəroʊˈblæstɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: porphyro- comb. form, -blastic comb. form. Etymology: < porphyro- comb. form + -blastic comb. form, after German porphyroblastisch (F. Becke 1904, in Congr. Géol. Internat.: Comptes Rendus 9me Sess. 1903 II. 570). Compare porphyroblast n. Geology. Of a rock or its texture: marked by the presence of porphyroblasts. Also: occurring in the form of porphyroblasts. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > texture > embedded crystals ophitical1611 ophitic1870 poikilitic1886 hyalopilitic1888 miarolitic1889 hyalo-ophitic1920 poikiloblastic1920 porphyroblastic1920 porphyroclastic1920 1920 A. Holmes Nomencl. Petrol. 188 Porphyroblast,..a term given to the pseudo-porphyritic crystals of rocks produced by thermodynamic metamorphism. The corresponding texture is called porphyroblastic. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) x. 229 (caption) Porphyroblastic garnet (and staurolite) in muscovite schist. 1991 Ann. Rep. Brit. Geol. Surv. 1990–91 48 Later ductile shearing on the granite contact has produced a sequence of porphyroblastic gneisses and mylonites. This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022). < adj.1920
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