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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).
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adj.1920
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