Ib porphyritic kev ntxhib los mos yog tsim thaum magma uas tau maj mam txias thiab crystallising nyob rau hauv lub ntiaj teb lub crust yog dheev erupted ntawm nto, ua rau cov seem uncrystallised magma kom txias sai heev. Qhov kev ntxhib los mos yog cov yam ntxwv ntawm feem ntau cov pob zeb volcanic. … Qhov kev ntxhib los mos no nthuav tawm los ntawm qee cov pob zeb volcanic.
Puas yog pob zeb porphyritic intrusive?
pob zeb Porphyritic tej zaum yuav yog pob zeb aphanites lossis pob zeb extrusive, nrog cov pob zeb loj lossis phenocrysts ntab hauv cov pob zeb zoo ntawm cov pob zeb uas tsis pom, xws li hauv cov pob zeb porphyritic, lossis phanerites lossis cov pob zeb intrusive, nrog cov pob zeb ntawm cov av. yooj yim txawv nrog lub qhov muag, tab sis ib pab pawg neeg muaju …
pob zeb dab tsi yog porphyritic?
Porphyritic kev ntxhib los mos yogigneous pob zeb kev ntxhib los mosnyob rau hauv uas cov muaju loj yog teem rau hauv cov hmoov nplej zoo los yog iav hauv av. Porphyritic textures tshwm sim nyob rau hauv ntxhib, nruab nrab thiab nplua-grained igneous pob zeb. Feem ntau cov crystals loj dua, hu ua phenocrysts, tsim ua ntej hauv crystallisation ib ntus ntawm magma.
porphyritic qauv yog dab tsi?
In feldspar: Crystal qauv. (Ib qho porphyry yog ib pob zeb tsis muaj pob zeb uas muaj cov pob zeb pom tseeb, hu ua phenocrysts, nyob ib puag ncig los ntawm cov matrix ntawm finer-grained minerals los yog iav los yog ob qho tib si.) Hauv cov pob zeb feem ntau, ob qho tib si alkali thiab plagioclase feldspars tshwm sim raws li irregularly zoo li cov nplej nrog ob peb los yog tsis muaj crystal ntsej muag.
Qhov twgporphyritic pob zeb pom?
Thaum cov av loj yog tsim los ntawm cov muaju me me ntawm feldspar thiab quartz, lub pob zeb hu ua granite-porphyry. Ob leeg yog cov muaj pes tsawg leeg ntawm granite, thiab ob qho tib si muaj nyob rau hauv elvan dikes ntawm tin koog tsev kawm ntawv hauv Cornwall. Quartz- porphyry muaj nyob rau hauv Porcupine kub camp, Ontario.
