Schistosity yog tsim ntawm qhov kub siab thaum lub pob zeb muaj zog compressed nyob rau hauv ib qho kev taw qhia dua li lwm cov lus qhia(kev ntxhov siab tsis muaj dej). Nonhydrostatic kev nyuaj siab yog tus yam ntxwv ntawm lub cheeb tsam metamorphism qhov twg lub roob roob yog qhov chaw (ib txoj siv orogenic).
Schistosity txhim kho li cas?
Schistosity, hom foliation uas tshwm sim nyob rau hauv qee yam metamorphic pob zeb raws li qhov tshwm sim ntawm qhov sib npaug ntawm cov platy thiab lath-shaped mineral constituents. Nws muaj kev cuam tshuam loj heev ntawm metamorphism-i.e., kev hloov pauv uas tshwm sim los ntawm qhov kub thiab txias, siab, thiab deformation.
Porphyroblast tsim li cas?
Ib lub pob zeb loj uas nyob ib puag ncig los ntawm cov nplua-grained matrix hauv cov pob zeb metamorphic. Porphyroblasts daim ntawv los ntawm recrystallization ntawm cov pob zeb hauv av uas twb muaj lawm thaum lub sijhawm metamorphism. Lawv zoo ib yam rau phenocrysts nyob rau hauv igneous pob zeb.
Nyob qhov twg yog tus kws kho mob pom?
Cov pob zeb qub no tau sau tseg tias yog pob zeb ua tswv rau ntau yam kev tso nyiaj hauv Australia, Namibia thiab Canada. Greenschist-zoo li pob zeb kuj tuaj yeem tsim nyob rau hauv blueschist facies tej yam kev mob yog tias cov pob zeb qub (protolith) muaj magnesium txaus.
foliation thaum twg tshwm sim?
Foliation forms thaum lub siab nyem lub tiaj los yog elongate cov ntxhia hauv pob zeb kom lawv ua raws li. Cov pob zeb no tsim cov platy lossis cov ntawv zoo li cov qauvuas qhia txog cov kev taw qhia uas siv siab.
