Metamorphic pob zeb

Nyob rau hauv cov xwm, muaj ntau ntau ntau ntau yam ntawm pob zeb: sedimentary, metamorphic thiab magmatic. Tag nrho cov ntawm lawv sawv cev rau Tiabsis cov tej yam minerals.

Nyob rau hauv no tsab xov xwm peb yuav sib tham txog nyob rau hauv kom meej li cas lub metamorphic pob zeb. Peb piav qhia txog cov hom, yam ntxwv thiab cov hau kev ntawm kev siv nyob rau hauv kev lag luam.

Tab sis saum toj no tag nrho, nws yuav tsum qhia rau koj hais tias xws li pob zeb. Qhov no lub sij hawm yog siv los xa mus rau cov tshuaj xwm ntawm lub tebchaw uas yog tsim nyob rau hauv lub kiav txhab.

Metamorphic pob zeb no yog cov kev tshwm sim ntawm kis tau tus sov siab thiab muaj zog siab nyob rau hauv cov zaub mov ntawm magmatic los yog sedimentary keeb kwm. Cov tshuaj nyob tus yeees ntawm cov zaub mov tsis yauv tseem ceeb kev hloov, tab sis lawv tau ib tug tshiab kev ntxhib los mos thiab cov qauv.

Muaj ntau metamorphic minerals yog txawv shale (lub xub ntiag ntawm nyias slips). Qhov no yam ntxwv qhia mineral tsim qauv (nyob rau hauv siab). Tej zaub mov muaj lub peev xwm mus ua txhaum mus rau hauv ib tug nyias phaj.

Yog hais tias tus txheej txheem ntawm converting ib co lwm yam minerals (metamorphism) tshwm sim nyob rau hauv qhov kev txiav txim ntawm tshav kub sab loj ntawm ib tug ntiav qhov tob, nyob rau hauv cov ntaub ntawv no, metamorphic pob zeb yuav muaj rogovistuyu qauv. Qhov no yog tus yam ntxwv zoo los ntawm hornfelses (biotite, pyroxene, amphibolite) tsim ntawm av nplaum.

Tus txheej txheem ntawm metamorphism (transformation) tej zaum yuav raug rau tej zaub mov - igneous, sedimentary los yog metamorphic keeb kwm. Tej transformations ua nyob rau hauv lub pob zeb los ntawm txoj kev recrystallization nyob rau hauv lub khoom hauv lub xeev. Lub degree ntawm transformation ntawm lub pib minerals muaj peev xwm heev ntau haiv neeg, xws li los ntawm me me kev hloov kho rau theem kev hloov nyob rau hauv muaj pes tsawg leeg thiab zoo ntawm lub pob txha. Qhov xwm ntawm metamorphism yog kuj sib txawv. Nws yuav tshwm sim xwb ib tug me me foob, los yog tej zaum yuav ua kom tiav recrystallization ntawm cov mineral.

Tag nrho metamorphic pob zeb yog inherently theem nrab khoom. Nyob ntawm seb cov neeg kawm ntawv ntawm hloov dua siab tshiab, muaj ntau ntau hom kev hloov minerals:

• Lub sib cuag. Nws tshwm sim los ntawm cov intrusion ntawm magma (kev taw qhia nyob rau hauv lub ntiaj teb ua kiav txhab) thiab nws cov kev sis raug zoo nrog cov sediments. Minerals ntawm no hom yuav tsim nyob rau hauv tus ntawm siab thiab kub. Tej pob txha koom marble, skarn, migmatite. Hom hu metamorphism yog feem ntau crystalline, loj heev, thiab saccharoidal slabosloistoe qauv, nyob rau nyob tus yeees ntawm cov zaub mov preperpevaet tseem ceeb kev hloov.
• Regional (sib sib zog nqus). kev hloov kho cov txheej txheem yuav siv sij hawm qhov chaw nyob rau zoo depths nrog kub siab sis, kub thiab kua. Lub mineralogical muaj pes tsawg leeg ntawm cov zaub mov nyob rau hauv cov ntaub ntawv no, kuv ua tsis tau ib txwm. Yug txawv crystalline shale, kaw ntom nti ua qauv.
• Dynamo metamorphism. Lub transformation txheej txheem tshwm sim nyob rau hauv lub tectonic daim hlau nyob rau hauv kub siab. Nyob rau hauv ntau yam ntawm cov zaub mov tsim ib tug muaj zog cheeb tsam ntawm lub cev qhuav dej thiab txoj folds. Cov fossils yog mylonites thiab kos-taklazity.

Feem ntau metamorphic pob zeb yog pom nyob rau hauv qhov nyob rau hauv daim ntawv ntawm cov leeg, strata thiab lo ntsiab muag. Lawv feem ntau khaws cov thawj hauv daim ntawv ntawm cov mineral tshwm sim, tab sis thaum nyob rau hauv kev sib cuag nrog intrusions magma minerals tej zaum yuav irregularly zoo li tus.

Metamorphic minerals yog siv thoob ntiaj teb raws li ib tug hniav, lub tsev thiab ornamental cov ntaub ntawv uas (quartzite, marble, schist, gneiss). Lawv kuj siv tau raws li muaj raw cov ntaub ntawv (asbestos, talc, thiab lwm yam). Qhov xwm ntawm tus metamorphic pob zeb feem ntau nyob ze deposits ntawm minerals, precious thiab semi-precious pob zeb (ruby, kab tho, jade, garnet, etc.).