Ib tug loj siv lead ua embedded nyob rau hauv ib tug finer-grained los yog glassy igneous pob zeb. Lub xub ntiag ntawm phenocrysts muab lub pob zeb ua porphyritic kev ntxhib los mos (saib daim duab). Phenocrysts feem ntau sawv cev los ntawm feldspar, quartz, biotite, hornblende, pyroxene thiab olivine.
YYuav ua li cas cov zaub mov yog phenocrysts?
feldspar minerals (Ib porphyry yog ib lub pob zeb uas tsis muaj zog uas muaj cov muaju, hu ua phenocrysts, nyob ib puag ncig los ntawm 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 cov nplej tsis xwm yeem nrog ob peb lossis tsis muaj siv lead ua…
Phenocrysts tsim li cas?
Porphyrys yog tsim los ntawm a ob-theem txias ntawm nce magma. … Thib ob, cov magma txias sai sai ntawm qhov tob tob uas tau txhaj rau sab saud lossis extruded los ntawm lub roob hluav taws, tso cai rau tsim cov pob zeb me me hauv av.
Koj paub li cas phenocrysts hauv pob zeb tsis pom kev?
A phenocryst yog ib qho kev tsim thaum ntxov, kuj loj thiab feem ntau pom tau tias siv lead ua sib txawv loj dua cov nplej ntawm pob zeb hauv av loj ntawm cov pob zeb tsis pom kev. Cov pob zeb zoo li no uas muaj qhov sib txawv ntawm qhov loj ntawm cov pob zeb hu ua porphyries, thiab cov npe porphyritic yog siv los piav qhia lawv.
Koj paub phenocrysts li cas?
Phenocrysts yog cov muaju nyob ib puag ncig los ntawm matrix; cov no feem ntau yog loj, ncaj-sab, thiab iav pob zeb tshwj tsis yoglawv tau huab cua. Porphyritic yog siv los ua cov lus qhia los hloov kho lub npe ntawm cov pob zeb zoo nkauj uas muaj tsawg dua 50% phenocrysts hauv nws.
