Qhov sib txawv ntawm cov pob zeb tsis pom kev thiab cov pob zeb metamorphic yog cov pob zeb uas tsis muaj zog yog cov pob zeb qub tshaj plaws hauv ntiaj teb, thaum cov pob zeb metamorphic yog cov khoom siv ntawm cov pob zeb tsis muaj zog thiab cov pob zeb sedimentary.
Cov pob zeb tsis zoo, cov pob zeb sedimentary, thiab cov pob zeb metamorphic yog peb hom pob zeb loj hauv lub ntiaj teb crust. Geologist ua qhov kev faib tawm no raws li cov txheej txheem geological uas tsim cov pob zeb no. Igneous pob zeb yog tsim thaum melted pob zeb los yog magma cools thiab solidifies thaum sedimentary pob zeb yog tsim thaum sediments tau solidified. Metamorphic pob zeb, ntawm qhov tod tes, yog cov pob zeb uas tau hloov los ntawm cov pob zeb tsis zoo lossis cov pob zeb metamorphic. Zoo li lub voj voog dej, muaj lub voj voog pob zeb (geological voj voog) hauv geology. Nws yog cov txheej txheem los ntawm cov pob zeb tsim, degraded thiab hloov kho los ntawm cov txheej txheem geological sab hauv xws li plutonism, volcanism, uplift thiab / los yog los ntawm cov txheej txheem geological sab nraud xws li yaig, huab cua, thiab deposition.
Igneous Rocks yog dab tsi?
Cov pob zeb tsis pom kev yog hom pob zeb qub tshaj plaws hauv ntiaj teb. Tag nrho lwm hom pob zeb tsim los ntawm igneous pob zeb. Igneous pob zeb tsim thaum magma (cov ntaub ntawv molten) nce los ntawm lub ntiaj teb sab hauv. Peb tuaj yeem faib cov pob zeb no ntxiv raws li lawv qhov tob ntawm kev tsim. Cov pob zeb uas tsim hauv qab lub ntiaj teb saum npoo yog cov pob zeb uas tsis muaj zog, thaum cov pob zeb uas tsim nyob rau hauv lub ntiaj teb saum npoo yog cov pob zeb extrusive igneous (volcanic pob zeb).
Daim duab 01: Pob Zeb Igneous
Cov pob zeb no muaj 40% txog 80% silica. Magnesium thiab hlau yog cov khoom tseem ceeb ntawm lwm cov khoom. Granite, pegmatite, gabbro, dolerite, thiab bas alt yog qee qhov piv txwv ntawm pob zeb tsis pom kev.
Metamorphic pob zeb yog dab tsi?
Metamorphic pob zeb tsim vim metamorphism los ntawm cov pob zeb uas twb muaj lawm lossis cov pob zeb sedimentary, lossis txawm los ntawm cov pob zeb metamorphic uas twb muaj lawm. Thaum cov pob zeb uas twb muaj lawm raug hloov pauv vim muaj kev kub ntxhov thiab/lossis kub thiab/lossis siab shearing stresses, metamorphic pob zeb daim ntawv.
Daim duab 02: Pob Zeb Metamorphic
Feem ntau, cov pob zeb metamorphic tsim tob hauv lub ntiaj teb. Thaum tshav kub kub los ntawm magma, thaum lub siab los ntawm txheej pob zeb nyob rau sab saum toj ntawm lwm txheej. Peb tuaj yeem faib cov pob zeb no raws li foliation raws li cov pob zeb foliated thiab cov pob zeb uas tsis yog foliated. Foliation yog hais txog lub hav zoov ntawm ib tug series ntawm parallel nto. Cov pob zeb no feem ntau muaj siv lead ua. Gneiss, slate, marble, thiab quartzite yog qee cov pob zeb metamorphic.
Qhov txawv ntawm Igneous Pob Zeb thiab Metamorphic Pob Zeb yog dab tsi?
Qhov sib txawv tseem ceeb ntawm cov pob zeb tsis pom kev thiab cov pob zeb metamorphic yog cov pob zeb tsis muaj zog yog cov pob zeb qub tshaj plaws hauv ntiaj teb, thaum metamorphic yog cov txiaj ntsig ntawm cov pob zeb tsis muaj zog thiab cov pob zeb sedimentary. Tsis tas li ntawd, Igneous pob zeb ua rau cov feem loj (ze li 95%) ntawm tag nrho cov pob zeb, thaum metamorphic pob zeb muaj nyob rau hauv ib feem me me.
Tsis tas li ntawd, cov pob zeb tsis muaj zog yog tsim los ntawm ob lossis ntau dua cov ntxhia, thaum cov pob zeb metamorphic feem ntau yog tsim los ntawm ib qho ntxhia xwb. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm cov pob zeb igneous thiab metamorphic pob zeb. Tsis tas li ntawd, lwm qhov sib txawv tseem ceeb ntawm cov pob zeb igneous thiab cov pob zeb metamorphic yog cov pob zeb metamorphic nyuaj dua li cov pob zeb tsis muaj zog. Txawm li cas los xij, kev tiv thaiv huab cua thiab yaig tsawg dua hauv cov pob zeb metamorphic piv rau cov pob zeb tsis muaj zog. Tsis tas li ntawd, qhov nyiam ua rau cov kua qaub ntau dua hauv cov pob zeb metamorphic thaum piv rau cov pob zeb tsis pom kev.
Summary – Igneous Rocks vs Metamorphic Rocks
Cov pob zeb tsis zoo, cov pob zeb sedimentary, thiab cov pob zeb metamorphic yog peb hom pob zeb loj hauv lub ntiaj teb crust. Qhov sib txawv tseem ceeb ntawm cov pob zeb tsis pom kev thiab cov pob zeb metamorphic yog cov pob zeb uas tsis muaj zog yog cov pob zeb qub tshaj plaws hauv ntiaj teb thaum metamorphic yog cov khoom siv ntawm cov pob zeb tsis muaj zog thiab cov pob zeb sedimentary.
