Kev tsim Marble
Aug 14, 2019
Pob zeb yog metamorphic pob zeb tsim los ntawm thawj lub pob zeb nyob rau hauv lub ntiaj teb ua kiav txhab los ntawm kev kub thiab siab nyob hauv av lub ntiaj teb. Sab hauv lub zog ntawm cov kaub puab tau txhawb cov txheej txheem ntawm cov kev hloov pauv ntawm ntau hom pob zeb. Qhov kev hloov pauv yog hais txog qhov hloov ntawm cov qauv, qauv thiab pob zeb hauv qab ntawm cov pob zeb qub. Lub pob zeb tshiab ua los ntawm qhov hloov qhov tsim nyog hu ua metamorphic rock. Marble yog tsuas yog tsim ntawm calcite, limestone, serpentine thiab dolomite. Nws lub ntsiab tivthaiv yog calcium carbonate, suav rau ntau tshaj 50%.
Lwm tus suav nrog magnesium carbonate, calcium oxide, manganese oxide, thiab silicon dioxide. Txij li thaum marble feem ntau muaj impurities, thiab calcium carbonate yog yooj yim corroded thiab yaj hauv cov huab cua los ntawm carbon dioxide, carbides thiab dej vapor, qhov saum npoo tau sai sai, thiab qhov xwm txheej ntawm marble yog tus mos, uas yog txheeb ze ntawm granite. Pob zeb. Ntawm chav kawm, koj tsis tas yuav them sai sai rau qhov no, vim hais tias lub sijhawm ntsuas geological yog tau txiav txim siab hauv ntau lab. Hauv peb lub neej, qhov kev hloov pauv zoo no tsuas yog hloov tsawg.
Kuj tseem hu ua marble, nws yog recrystallized limestone nrog lub ntsiab tivthaiv CaCO3. Limestone mos mos nyob hauv qab qhov kub thiab siab thiab siab dua thiab rov ua dua tshiab los tsim marble thaum hloov pauv cov zaub mov. Cov khoom tseem ceeb yog calcium thiab dolomite, uas muaj ntau yam xim thiab feem ntau muaj cov qauv pom tseeb thiab ntau cov khoom siv ntxhia. Mohs hardness yog nruab nrab ntawm 2.5 thiab 5. Txij li thaum marble feem ntau muaj kev ua kom tsis zoo, thiab calcium carbonate raug cov pa roj carbon dioxide, carbides, thiab noo noo hauv cov huab cua, nws tseem yooj yim weathered thiab yaig, thiab saum npoo poob sai sai nws cov lus. Marble yog feem ntau muag nyob rau hauv qhov, raws li txwv mus rau granite. Hauv kev kho kom zoo nkauj sab hauv, marble countertops, qhov rai sills, cov plag tsev sab hauv tsev, thiab lwm yam yog cov tsim nyog siv rau hauv marble. Marble yog lub npe lag luam, tsis yog petrological txhais.
