Video: Cov pob zeb metamorphic nthuav tawm li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Metamorphic pob zeb yog tsim nyob rau hauv lub ntiaj teb lub crust. Hloov qhov kub thiab txias tej yam kev mob yuav ua rau muaj kev hloov rau cov ntxhia sib dhos ntawm lub protolith. Metamorphic pob zeb yog thaum kawg nthuav tawm nyob rau saum npoo los ntawm uplift thiab yaig ntawm lub overlying pob zeb.
Dhau li ntawm no, cov pob zeb metamorphic sib cuag li cas?
Hu rau Metamorphism. Metamorphic pob zeb uas daim ntawv nyob rau hauv tej yam kev mob uas tsis tshua muaj siab los yog cia li confining siab tsis ua foliated. Feem ntau, qhov no yog vim lawv tsis faus tob, thiab cov cua sov rau lub metamorphism los ntawm lub cev ntawm magma uas tau tsiv mus rau sab sauv ntawm lub crust.
Ib yam li ntawd, peb kawm tau dab tsi los ntawm cov pob zeb metamorphic? Geologists tuaj yeem kawm cov hauv qab no txog lub ntiaj teb los ntawm kev kawm txog cov pob zeb metamorphic:
- qhov kub thiab txias tej yam kev mob (metamorphic ib puag ncig) nyob rau hauv lub pob zeb tsim.
- qhov muaj pes tsawg leeg ntawm niam txiv, los yog thawj unmetamorphosed, pob zeb.
Ib yam li ntawd, tib neeg nug, metamorphism ua dab tsi rau pob zeb?
Hauv cheeb tsam metamorphism feem ntau ua foliated pob zeb xws li gneiss thiab schist. Dynamic Metamorphism kuj tshwm sim vim yog roob-tsev. Cov rog loj heev ntawm tshav kub thiab siab ua rau pob zeb yuav tsum tau khoov, folded, crushed, flattened, thiab sheared. Metamorphic pob zeb yog yuav luag ib txwm nyuaj tshaj sedimentary pob zeb.
Dab tsi yog lub npe hu ua metamorphic pob zeb?
A metamorphic pob zeb yog hom pob zeb uas tau hloov los ntawm huab cua kub thiab siab. Nws lub npe yog los ntawm 'morph' (lub ntsiab lus daim ntawv), thiab 'meta' (lub ntsiab lus hloov). Tus thawj pob zeb tau rhuab (kub siab tshaj 150 mus rau 200 ° C) thiab pressured (1500 bars). Marble yog ib metamorphic pob zeb tsim los ntawm limestone.
Pom zoo:
Dab tsi yog qhov txawv ntawm cov pob zeb tsis foliated thiab foliated metamorphic pob zeb?
Foliated metamorphic pob zeb xws li gneiss, phyllite, schist, thiab slate muaj ib txheej txheej los yog banded zoo li uas yog tsim los ntawm raug tshav kub thiab qhia siab. Non-foliated metamorphic pob zeb xws li hornfels, marble, quartzite, thiab novaculite tsis muaj txheej txheej lossis banded zoo li
Yuav ua li cas lub pob zeb sedimentary ua ib lub pob zeb metamorphic?
Sedimentary pob zeb ua metamorphic nyob rau hauv lub pob zeb voj voog thaum lawv raug tshav kub thiab siab los ntawm faus. Cov kub kub yog tsim thaum lub ntiaj teb daim hlau tectonic txav ib ncig, ua kom sov. Thiab thaum lawv sib tsoo, lawv tsim roob thiab metamorphose
Dab tsi yog cov pob zeb niam txiv ntawm cov pob zeb metamorphic?
Metamorphic pob zeb Metamorphic pob zeb Texture Niam txiv pob zeb Phyllite Foliated Shale Schist Foliated Shale, granite thiab volcanic pob zeb Gneiss Foliated Shale, granite thiab volcanic pob zeb Marble Nonfoliated Limestone, dolostone
Cov pob zeb hauv av twg tuaj yeem tsim cov pob zeb zoo li lub raum?
Hematite (los yog haematite) Kuj tseem muaj ntau hom hematite, qee yam yog: raum ore, ib qho loj, botryoidal (lumpy) lossis reniform (lub raum zoo li tus) daim ntawv; specularite, micaceous (flaky) daim ntawv; oolitic, ib daim ntawv sedimentary tsim los ntawm cov nplej me me; liab ochre, ib daim ntawv liab earthy
Lub pob zeb foliated twg yog qhov qis tshaj plaws metamorphic pob zeb?
slate Ua li no, marble puas yog qib qis metamorphic pob zeb? Qee qhov piv txwv ntawm non-foliated Cov pob zeb metamorphic yog marble , quartzite, thiab hornfels. Marble yog metamorphosed limestone. Thaum nws tsim, cov calcite crystals yuav loj hlob tuaj, thiab tej yam sedimentary textures thiab fossils uas muaj tam sim no raug puas tsuaj.