Qhov sib txawv tseem ceeb ntawm schist thiab gneiss yog tias schist yog ua los ntawm av nkos lossis shale, whereas gneiss yog ua los ntawm micas, chlorite, los yog lwm yam platy minerals.
Thaum tus txheej txheem ntawm metamorphism, pob zeb xws li pob zeb sedimentary, pob zeb tsis pom kev, lossis cov pob zeb metamorphic zoo li hloov mus ua cov pob zeb schists thiab gneiss pob zeb.
Schist yog dab tsi?
Schist yog ib hom pob zeb metamorphic ua los ntawm cov av nkos lossis shale. Nws raug cais raws li qib nruab nrab ntawm cov pob zeb metamorphic. Cov khoom no muaj nruab nrab mus rau loj nplej nyob rau hauv cov duab xws li tiaj tus thiab daim ntawv qauv roughly nyob rau hauv ib tug parallel orientation. Peb tuaj yeem txhais hom pob zeb no raws li muaj ntau tshaj 50% ntawm nws cov qauv platy thiab raws li elongated ntxhia qauv, suav nrog micas thiab talc. Feem ntau, hom pob zeb no zoo sib cuam tshuam nrog quartz thiab feldspar. Cov pob zeb lamellar peb tuaj yeem soj ntsuam hauv cov pob zeb no suav nrog micas, chlorite, talc, hornblende, graphite, thiab lwm yam.
Feem ntau, schist yog garnetiferous, thiab nws tsim ntawm qhov kub thiab txias. Ntxiv mus, cov ntxhia no muaj cov nplej loj uas loj dua phyllite. Schist pob zeb muaj geological foliation los yog metamorphic kev npaj nyob rau hauv cov khaubncaws sab nraud povtseg uas muaj nruab nrab mus rau loj grained flakes nyob rau hauv ib daim ntawv zoo li orientation uas yog hu ua schistosity.
Daim duab 01: Schist Rock
Thaum tus txheej txheem ntawm metamorphism, pob zeb xws li pob zeb sedimentary, pob zeb tsis muaj zog lossis cov pob zeb metamorphic zoo li hloov mus rau hauv cov pob zeb schists thiab gneiss pob zeb. Txawm li cas los xij, qee zaum peb tsis tuaj yeem paub qhov txawv ntawm lub pob zeb los ntawm lwm qhov yog tias cov metamorphism tau zoo heev thiab cov pob zeb ntawm cov pob zeb no zoo ib yam. Tab sis nws muaj peev xwm paub qhov txawv ntawm ib qho sedimentary lossis igneous shist los ntawm sedimentary lossis igneous gneiss. E.g. Yog hais tias lub pob zeb muaj cov kab hauv txaj, cov qauv yas los yog tsis sib haum, nws qhia tau tias cov pob zeb qub yog sedimentary.
Gneiss yog dab tsi?
Gneiss yog ib hom pob zeb metamorphic ua los ntawm micas, chlorite, thiab lwm yam platy minerals. Nws muaj ntau thiab dav dav. Hom pob zeb no tsim los ntawm qhov kub thiab txias thiab cov txheej txheem siab metamorphic uas ua rau cov txheej txheem uas muaj cov pob zeb tsis zoo lossis cov pob zeb sedimentary. Muaj lwm qhov kev hloov pauv ntawm gneiss hu ua paragneiss, uas muab los ntawm cov pob zeb sedimentary, xws li. xuab zeb. Feem ntau, hom pob zeb no ua rau ntawm qhov kub thiab qhov siab piv rau qhov tsim ntawm schist pob zeb. Lub pob zeb no yuav luag ib txwm tshwm sim nrog kev ntxhib los mos uas muaj qhov sib txawv ntawm cov xim tsaus thiab sib dua. Ntxiv mus, nws tsis muaj foliation txawv.
Daim duab 02: Gneiss Rock
Feem ntau, gneiss pob zeb yog nruab nrab mus rau coarse foliated. Lub pob zeb loj heev dhau recrystallization. Txawm li cas los xij, nws tsis nqa ntau ntawm mica, chlorite, lossis lwm yam platy minerals. Ntxiv mus, gneiss pob zeb uas yog tsim los ntawm metamorphism ntawm igneous pob zeb yog hu ua granite gneisses, diorite gneiss, thiab lwm yam.
Qhov txawv ntawm Schist thiab Gneiss yog dab tsi?
Thaum tus txheej txheem ntawm metamorphism, pob zeb xws li pob zeb sedimentary, pob zeb tsis muaj zog lossis cov pob zeb metamorphic zoo li hloov mus rau hauv cov pob zeb schists thiab gneiss pob zeb. Qhov sib txawv tseem ceeb ntawm schist thiab gneiss yog tias schist yog ua los ntawm cov av nkos los yog shale, whereas gneiss yog ua los ntawm micas, chlorite los yog lwm yam platy minerals. Ntxiv mus, schists tsim nyob rau hauv qhov sib piv tsis tshua muaj kub los yog siab tej yam kev mob, whereas gneiss daim ntawv ntawm comparatively high kub thiab siab tej yam kev mob.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm schist thiab gneiss hauv daim ntawv tabular.
Summary – Schist vs Gneiss
Schist thiab gneiss yog hom pob zeb metamorphic. Qhov sib txawv tseem ceeb ntawm schist thiab gneiss yog tias schist yog ua los ntawm cov av nkos los yog shale, whereas gneiss yog ua los ntawm micas, chlorite los yog lwm yam platy minerals.
