Qhov txawv ntawm limestone thiab chalk yog limestone muaj ob qho tib si minerals, calcite, thiab aragonite whereas chalk yog ib daim ntawv ntawm limestone uas muaj calcite.
Limestone yog hom pob zeb sedimentary. Nws tsuas yog muaj ntau hom siv lead ua ntawm calcium carbonate. Yog li no cov ntxhia yog heev alkaline. Chalk yog ib daim ntawv ntawm limestone. Nws muaj ntau yam khoom zoo, uas peb yuav tham hauv qab no. Txawm hais tias nws yog ib daim ntawv ntawm limestone, 99% ntawm cov pob zeb no muaj calcite hom crystal form.
Limestone yog dab tsi?
Limestone yog pob zeb sedimentary, uas muaj ob hom minerals loj; Calcite thiab aragonite. Cov zaub mov no yog cov qauv siv lead ua sib txawv ntawm calcium carbonate (CaCO3). Cov pob zeb sedimentary no tshwm sim los ntawm kev tso tawm ntawm cov pob txha tawg ntawm cov kab mob hauv hiav txwv xws li coral, forams thiab molluscs. Yog li ntawd, cov ntxhia no feem ntau tsim hauv cov dej ntshiab, sov thiab ntiav dej hiav txwv. Txawm li cas los xij, cov pob zeb sedimentary no tuaj yeem tsim los ntawm nag lossis daus ntawm calcium carbonate los ntawm lub pas dej lossis dej hiav txwv thiab.
Qhov laj thawj yog vim li cas cov pob zeb no tsim hauv cov dej ntshiab, sov thiab ntiav dej hiav txwv yog qhov chaw ib puag ncig no tso cai rau cov kab mob hauv hiav txwv los tsim cov calcium carbonate. Ntxiv mus, lawv cov pob txha tuaj yeem yooj yim tshem tawm cov khoom xyaw tsim nyog tsim dej hiav txwv. tom qab ntawd thaum cov kab mob no tuag, lawv cov pob txha pob txha pob txha sib sau ua sediment. Cov sediment tom qab lithify rau limestone. Ntxiv rau qhov ntawd, cov khoom pov tseg ntawm cov kab mob no tseem ua rau tsim cov pob zeb sedimentary.
Daim duab 01: Lub Pyramid ntawm Giza
Muaj ntau hom limestone xws li chalk, coquina, fossiliferous limestone, lithographic limestone, tufa, thiab lwm yam. Lawv txawv ntawm ib leeg raws li tsim, tsos thiab muaj pes tsawg leeg.
Muaj ntau siv limestone. Nws muaj ntau nyob rau hauv architecture; muaj ntau qhov chaw uas tau tsim los ntawm lub pob zeb no. Piv txwv li: Great Pyramid. Tsis tas li ntawd, nws yog cov khoom siv tseem ceeb hauv kev ua cov kua qaub sai, slaked txiv qaub, cement, thiab lwm yam. Tsis tas li ntawd, peb tuaj yeem siv cov pob zeb no los ua cov av txias kom tsis txhob muaj cov av acidic.
Chalk yog dab tsi?
Chalk yog ib daim ntawv ntawm limestone muaj calcite raws li cov ntxhia loj; txog 99%. Yog li ntawd, nws kuj yog ib tug sedimentary carbonate pob zeb. Hom pob zeb no tsim nyob rau hauv qhov sib sib zog nqus marine tej yam kev mob, los ntawm tsub zuj zuj ntawm calcite shells. Cov calcite plhaub no los ntawm cov kab mob coccolithophores. Tsis tas li ntawd, chalk muaj ntau hom embedded nodules (los yog bands) hu ua Flint.
Daim duab 02: Ib Lub Qhov Ncauj
Chalk muaj ntau yam khoom zoo. Piv txwv li, nws muaj kev tiv thaiv zoo rau huab cua, slumping tshaj cov av nplaum uas cuam tshuam. Yog li ntawd, cov ntxhia no tsim siab, ntxhab pob tsuas. Peb tuaj yeem muab cov pob zeb me me los ntawm cov khoom siv chalk. Cov kev tso nyiaj no tuaj yeem tshwm sim hauv av thiab hauv av.
Muaj ntau siv cov ntxhia no. Ntawm tag nrho cov, feem ntau daim ntawv thov yog kev tsim cov blackboard chalk. Ntxiv rau qhov ntawd, peb tuaj yeem siv nws los ua ib qho ntawm cov kua qaub (ntawm cov tshuaj tiv thaiv thermal decomposition) los yog ua ib qho ntawm cov txiv qaub slaked (ntawm quenching quicklime nrog dej). Tsis tas li ntawd, peb tuaj yeem siv chalk kom haum rau cov ntoo ua haujlwm sib koom ua ke.
Qhov txawv ntawm Limestone thiab Chalk yog dab tsi?
Limestone yog pob zeb sedimentary uas muaj ob hom minerals loj; Calcite thiab aragonite. Qhov no yog vim nws tsim los ntawm kev tso tawm ntawm cov pob txha tawg ntawm cov kab mob hauv hiav txwv xws li coral, forams thiab molluscs. Whereas, chalk yog ib daim ntawv ntawm limestone muaj calcite raws li cov pob zeb loj; txog 99%. Qhov no yog vim nws tsim los ntawm tsub zuj zuj ntawm calcite plhaub ntawm cov kab mob coccolithophores. Tsis tas li ntawd, chalk muaj flints. Cov duab hauv qab no nthuav tawm cov ntsiab lus ntxiv ntawm qhov sib txawv ntawm limestone thiab chalk.
Summary – Limestone vs Chalk
Limestone yog pob zeb sedimentary carbonate. Chalk yog hom limestone. Qhov sib txawv tseem ceeb ntawm limestone thiab chalk yog limestone muaj ob qho tib si minerals, calcite, thiab aragonite whereas chalk yog ib daim ntawv ntawm limestone uas muaj calcite.
