Limestone vs Marble
Ob leeg limestone thiab marble yog hom pob zeb ua los ntawm calcium carbonate residues. Txawm hais tias lawv cov tshuaj lom neeg yuav luag zoo ib yam, muaj ntau qhov sib txawv ntawm limestone thiab marble nyob rau hauv txoj kev lawv tuaj thiab lub cev yam ntxwv lawv muaj. Feem ntau cov no yog siv los ua cov khoom siv thiab ua raw khoom rau ntau yam kev lag luam.
Limestone
Limestone tsuas yog muaj ob hom minerals; uas yog, calcite thiab aragonite. Cov no yog ob hom sib txawv ntawm calcium carbonate nws tus kheej. Lub hauv paus ntawm cov calcium depositions feem ntau yog sab laug-over plhaub secretions/skeletal fragments ntawm marine kab mob xws li corals. Yog li, limestone yog ib hom pob zeb sedimentary tsim los ntawm kev tso cov khoom ntawm lub ntiaj teb saum npoo av los yog hauv dej. Sedimentation tuaj yeem tshwm sim ntawm qhov chaw ntawm qhov chaw lossis ntawm qhov chaw sib txawv kiag li. Yog tias nws nyob ntawm qhov chaw sib txawv, cov sediments raug thauj mus rau qhov chaw tso dej, cua, dej khov thiab lwm yam.
Limestone yog soluble hauv cov kua qaub tsis muaj zog feem ntau thiab qee zaum txawm nyob hauv dej. Nyob ntawm tus nqi pH ntawm dej, qhov kub thiab txias ntawm cov dej, thiab ion concentration, calcite yuav nyob twj ywm raws li precipitate los yog yaj. Yog li ntawd, limestone tsuas yog nyuam qhuav muaj sia nyob hauv dej thiab, thaum nyob hauv dej tob, nws dissolves vim dej siab. Feem ntau cov qhov tsua thaum ub tau tsim los ntawm kev yaig ntawm lub cev loj ntawm limestone los ntawm dej ntau txhiab lab xyoo. Av nplaum, silt thiab xuab zeb los ntawm cov dej ntws ua ke nrog cov khoom ntawm silica (los ntawm cov seem ntawm cov kab mob hauv hiav txwv) thiab hlau oxides yog cov feem ntau pom impurities hauv limestone. Vim muaj cov impurities nyob rau hauv ntau qhov sib txawv, lawv muaj xim sib txawv. Nyob ntawm txoj kev tsim nws tuaj yeem nqa cov duab sib txawv. i.e. crystalline, granular, loj pob zeb hom.
Limestone yog nto moo tshaj plaws nyob rau hauv lub xyoo pua 19th thiab 20th vim hais tias muaj ntau lub tsev pej xeem thiab cov qauv tsim los ntawm limestone. Lub Great Pyramid ntawm Giza uas yog ib qho ntawm Xya Wonders ntawm lub ntiaj teb no kuj yog ua los ntawm limestone. Kingston, Ontario, Canada yog lub npe hu ua 'Limestone City' vim muaj ntau lub tsev tsim los ntawm limestone. Raws li cov khoom siv raw hauv kev tsim cov cement thiab mortar, crushed ua lub hauv paus ruaj khov rau txoj kev, ntxiv cov xim dawb hauv cov tshuaj, tshuaj pleev ib ce, tshuaj txhuam hniav, ntawv, yas thiab lwm yam yog ntawm ntau lwm yam kev siv limestone.
Marble
Marble yog tsim thaum cov khoom siv carbonate hauv limestone tau recrystallized. Qhov no tshwm sim los ntawm tus txheej txheem hu ua 'metamorphism' uas txhais tau tias "hloov hom". Cov pob zeb metamorphic tau yug los thaum cov pob zeb uas twb muaj lawm tau hloov pauv lub cev / tshuaj lom neeg vim qhov kub thiab txias; yog li limestone muab yug rau marble thaum hloov. Lub npe 'marble' yog muab los ntawm Greek lo lus txhais tau tias "ci ntsa iab pob zeb". Dawb dawb marbles yog tau los ntawm cov ntaub ntawv ntshiab heev ntawm limestone los yog dolomite pob zeb, thiab cov xim marbles yog tshwm sim los ntawm impurities tam sim no nyob rau hauv niam txiv pob zeb. Feem ntau cov magnesium ntau hauv limestone muab cov xim ntsuab rau marble.
Marble feem ntau yog siv rau cov duab puab thiab ua cov khoom siv. Txij li thaum ancient sij hawm, marble sculptures muaj nws cov kev cai affiliates, tshwj xeeb tshaj yog cov Greek thiab Roman architects uas feem ntau siv nws los ua ib lub pob zeb zoo nkauj. Niaj hnub no, hluavtaws marble kuj tau tsim los ntawm kev sib xyaw cov hmoov av marble nrog cov cement thiab lwm yam resins. Ntawm cov teb chaws tsim marble saum toj kawg nkaus yog Ltalis, Tuam Tshoj, Is Nrias teb thiab Spain.
Qhov txawv ntawm Limestone thiab Marble yog dab tsi?
• Limestone yog hom pob zeb sedimentary tsim los ntawm kev tso tawm ntawm cov khoom siv carbonate, whereas marble yog hom metamorphic pob zeb tsim los ntawm metamorphism ntawm limestone.
• Lub hauv paus carbonate siv lead ua qauv ntawm limestone thiab marble sib txawv rau ib leeg.
• Marble kim dua limestone thiab muaj npe nrov rau nws cov duab puab.
• Marble muaj ntau yam xim thaum piv rau limestone.
Nyeem ntxiv:
1. Qhov txawv ntawm Gypsum thiab Limestone
2. Qhov txawv ntawm Limestone thiab Sandstone
