Definition of porphyroblast in English:

porphyroblast

noun ˈpɔːfɪrə(ʊ)blastpôrˈfirəˌblast

Geology

A larger recrystallized grain occurring in a finer groundmass in a metamorphic rock.
〔地质〕变斑晶，斑状变晶
Example sentencesExamples
- Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement.
- The foliation in the lowest unit is locally overgrown by porphyroblasts of andalusite (now commonly altered to finegrained phyllosilicates) and by biotite.
- Such inclusions may be aligned, preserving evidence of the fabric in the rock when the porphyroblast grew.
- Cordierite in these two metamorphic belts forms rounded, opaque black to brown porphyroblasts typically less than 0.5 inch across.
- In contrast, 2 km to the NE on the southern side of the Dharlang Nala, there are kyanite grade assemblages with a weaker foliation, flattened symmetrically around garnet porphyroblasts.

Derivatives

porphyroblastic

adjective pɔːfɪrə(ʊ)ˈblastɪk

Geology

The earliest porphyroblastic fabric is not restricted to the immediate metapluton surroundings.
Example sentencesExamples
- Strongly foliated porphyroblastic politic gneiss forms a selvedge up to 100 m thick in sharp (but in some cases ductile) contact with peridotite on the northern margin of the Carratraca massif.

Definition of porphyroblast in US English:

porphyroblast

nounpôrˈfirəˌblast

Geology

A larger recrystallized grain occurring in a finer groundmass in a metamorphic rock.
〔地质〕变斑晶，斑状变晶
Example sentencesExamples
- Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement.
- In contrast, 2 km to the NE on the southern side of the Dharlang Nala, there are kyanite grade assemblages with a weaker foliation, flattened symmetrically around garnet porphyroblasts.
- Cordierite in these two metamorphic belts forms rounded, opaque black to brown porphyroblasts typically less than 0.5 inch across.
- Such inclusions may be aligned, preserving evidence of the fabric in the rock when the porphyroblast grew.
- The foliation in the lowest unit is locally overgrown by porphyroblasts of andalusite (now commonly altered to finegrained phyllosilicates) and by biotite.

单词	porphyroblast
释义	Definition of porphyroblast in English: porphyroblast noun ˈpɔːfɪrə(ʊ)blastpôrˈfirəˌblast Geology A larger recrystallized grain occurring in a finer groundmass in a metamorphic rock. 〔地质〕变斑晶，斑状变晶 Example sentencesExamples Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement. The foliation in the lowest unit is locally overgrown by porphyroblasts of andalusite (now commonly altered to finegrained phyllosilicates) and by biotite. Such inclusions may be aligned, preserving evidence of the fabric in the rock when the porphyroblast grew. Cordierite in these two metamorphic belts forms rounded, opaque black to brown porphyroblasts typically less than 0.5 inch across. In contrast, 2 km to the NE on the southern side of the Dharlang Nala, there are kyanite grade assemblages with a weaker foliation, flattened symmetrically around garnet porphyroblasts. Derivatives porphyroblastic adjective pɔːfɪrə(ʊ)ˈblastɪk Geology The earliest porphyroblastic fabric is not restricted to the immediate metapluton surroundings. Example sentencesExamples Strongly foliated porphyroblastic politic gneiss forms a selvedge up to 100 m thick in sharp (but in some cases ductile) contact with peridotite on the northern margin of the Carratraca massif. Definition of porphyroblast in US English: porphyroblast nounpôrˈfirəˌblast Geology A larger recrystallized grain occurring in a finer groundmass in a metamorphic rock. 〔地质〕变斑晶，斑状变晶 Example sentencesExamples Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement. In contrast, 2 km to the NE on the southern side of the Dharlang Nala, there are kyanite grade assemblages with a weaker foliation, flattened symmetrically around garnet porphyroblasts. Cordierite in these two metamorphic belts forms rounded, opaque black to brown porphyroblasts typically less than 0.5 inch across. Such inclusions may be aligned, preserving evidence of the fabric in the rock when the porphyroblast grew. The foliation in the lowest unit is locally overgrown by porphyroblasts of andalusite (now commonly altered to finegrained phyllosilicates) and by biotite.
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