Limestone vs Sandstone
Limestone thiab sandstone muaj ntau nyob thoob ntiaj teb, thiab lawv yog pob zeb sedimentary heev. Txawm li cas los xij, lawv cov keeb kwm, muaj pes tsawg leeg thiab lwm yam khoom ntawm ob qho no txawv, ua rau lawv tsis sib xws.
Limestone
Limestone feem ntau pom nyob rau hauv ib puag ncig marine, thiab lawv raug cais raws li cov pob zeb sedimentary. Cov no tsuas yog tsim nyob rau hauv qhov ntiav ntiav, sov thiab txias dej. Kev ua haujlwm lom neeg kuj tseem ua lub luag haujlwm tseem ceeb hauv kev tsim cov limestone. Feem ntau, lawv tau tsim nyob rau hauv cov dej uas muaj cov pa roj carbon dioxide tsawg kom cov sedimentation yooj yim heev. Cov dej hiav txwv tau txais calcium los ntawm av. Muaj ntau cov calcium carbonate uas muaj cov ntaub ntawv, xws li cov plhaub ntawm cov mollusks thiab lwm cov tsiaj hiav txwv, coral, cov pob txha pob txha ntawm cov tsiaj hiav txwv, thiab lwm yam. Thaum cov no tau khaws cia rau hauv daim ntawv ntawm calcite (lwm cov ntaub ntawv pov tseg kuj zoo li koom nrog hauv qhov no thaum. accumulating), lawv hu ua limestone. Lawv kuj tau categorized li biological sedimentary pob zeb. Muaj lwm hom limestone hu ua chemical sedimentary pob zeb. Lawv yog tsim los ntawm nag lossis daus ncaj qha ntawm calcium carbonate hauv dej hiav txwv. Txawm li cas los xij, cov pob zeb biological sedimentary muaj ntau dua li cov pob zeb chemical sedimentary. Hauv cov limestone ntshiab, tsuas yog calcite nyob ntawd, tab sis feem ntau lawv tuaj yeem muaj impurities los ntawm kev sib xyaw lwm cov ntaub ntawv xws li xuab zeb. Yog li, limestone tuaj yeem txhais tau tias yog pob zeb sedimentary, muaj ntau tshaj 50% ntawm calcium carbonate nyob rau hauv daim ntawv ntawm calcite. Tsis yog nyob rau hauv dej hiav txwv thiab hiav txwv, limestone tuaj yeem tsim nyob rau hauv pas dej lossis lwm lub cev dej uas tsim nyog. Nyob rau hauv lub ntiaj teb no, limestone tsim yuav pom nyob rau hauv Caribbean Hiav txwv, Indian dej hiav txwv, Persian Gulf, Gulf of Mexico, nyob ib ncig ntawm lub hiav txwv Pacific Islands, thiab lwm yam.
Qhov xwm ntawm limestone nyob ntawm seb nws tsim li cas. Lawv tuaj yeem nyob hauv qhov loj me, crystalline, granular, thiab lwm yam. Lawv muab faib ua ob peb pawg raws li lawv hom kev tsim, muaj pes tsawg leeg lossis cov tsos. Muaj ntau yam kev faib tawm thiab. Qee cov limestones feem ntau yog chalk, coquina, lithographic limestone, oolitic limestone, fossiliferous limestone, tufa, thiab lwm yam. Muaj ntau yam kev siv limestone ib yam nkaus. Lawv feem ntau yog siv los ua cov khoom xyaw rau cov cement thiab iav tsim, yog li cov khoom siv tseem ceeb. Txij li thaum, limestone muaj qhov xwm txheej; Nws yog siv los neutralize acidic dej lub cev.
Sandstone
Sandstone kuj yog pob zeb uas pom dav dav. Nws yog tsim nyob rau hauv ntau qhov chaw xws li dej hiav txwv, pas dej, suab puam, thiab lwm yam. Lawv feem ntau yog tsim los ntawm cov xuab zeb nplej; Yog li ntawd, muaj quartz thiab feldspar nyob rau hauv ntau ntau. Sandstone tsim tshwm sim nyob rau hauv, Sahara suab puam nyob rau hauv teb chaws Africa, central Australia, Arabian suab puam, western United States, thiab lwm yam. Muaj peev xwm muaj ntau hom sandstones nyob rau hauv ntau yam xim. Sandstones yog siv rau cement lossis iav tsim. Nws muaj tus nqi zoo nkauj, nrog rau tus nqi ornamental. Lawv tuaj yeem raug txiav, polished thiab tom qab ntawd siv cov vuas lossis pob zeb zoo nkauj rau cov tsev lossis ua monuments.
Dab tsi yog qhov txawv ntawm Limestone thiab Sandstone?
• Limestone yog tsim los ntawm calcium carbonate sedimentation, whereas sandstone yog tsim los ntawm ntxhia nplej / xuab zeb.
• Limestone tuaj yeem yog pob zeb lom neeg lom zem; sandstones tsis yog.
• Limestone feem ntau muaj calcite. Sandstone feem ntau muaj quartz.
• Limestone muaj cov qauv crystalline. Hauv cov xuab zeb, qee zaum cov nplej tuaj yeem xoob cemented; Yog li ntawd, nyias nyias tuaj yeem pom.
• Limestone tsim yog nruj heev rau marine los yog lwm yam dej ib puag ncig, whereas sandstone tsim tshwm sim nyob rau hauv ntau qhov chaw.
