Cov Txheej Txheem ntawm Xob laim
Kev ua pob zeb yog ib qho txheej txheem ntuj tsim uas hloov cov khoom siv organic, xws li ntoo lossis pob txha, mus ua cov pob zeb fossils los ntawm kev ua pob zeb. Cov txheej txheem no siv sijhawm ntev heev, feem ntau yog ntau lab xyoo, thiab cuam tshuam nrog kev tso cov minerals uas maj mam hloov cov khoom siv organic qub thaum tseem khaws nws cov qauv qub. Tsab xov xwm no yuav tshawb nrhiav tob txog seb kev ua pob zeb tshwm sim li cas, cov yam ntxwv uas cuam tshuam rau nws, thiab cov piv txwv ntawm nws hauv keeb kwm geological.
Kev Taw Qhia Txog Xob Laim
Lo lus "petra" yog los ntawm cov lus Latin "petra," txhais tau tias pob zeb, thiab "ficare," txhais tau tias ua lossis tsim. Hauv lus tiag tiag, "petra" txhais tau tias "ua rau hauv pob zeb." Cov khoom siv organic uas raug petrification yog ntoo (ntoo fossilized) thiab pob txha (pob txha fossilized), tab sis ntau lwm yam khoom siv organic kuj tuaj yeem ua tiav cov txheej txheem no hauv qab cov xwm txheej zoo.
Cov Theem ntawm Cov Txheej Txheem Xob laim
Cov txheej txheem ntawm xob laim muaj ntau theem tseem ceeb uas tshwm sim rau lub sijhawm ntev heev:
1. Kev Khaws Cia Thaum Pib: Kauj ruam thawj zaug hauv kev ua pob zeb yog kev khaws cia cov khoom siv organic. Qhov no feem ntau tshwm sim hauv cov chaw uas tsis muaj oxygen, xws li hauv qab av nkos lossis cov xuab zeb. Qhov tsis muaj oxygen ua rau cov kab mob me me qeeb zuj zus, ua rau cov khoom siv organic nyob ruaj khov ntev dua.
2. Kev Faus Sai: Cov khoom siv organic yuav tsum tau npog sai sai los ntawm cov av noo kom tiv thaiv nws ntawm cov xwm txheej lwj xws li kev lwj ntawm cov kab mob, cov khoom noj khoom haus, thiab lwm yam hauv ib puag ncig. Kev faus sai kuj tiv thaiv kev raug cua, uas yuav ua rau kev lwj sai dua.
3. Kev Nkag Mus Rau Hauv Cov Pob Zeb: Tom qab faus, cov dej hauv av uas muaj cov pob zeb ntau yuav pib nkag mus rau hauv cov khoom siv organic. Cov dej no nqa cov kua pob zeb xws li silica, calcite, pyrite, lossis lwm yam pob zeb, nyob ntawm seb cov tshuaj lom neeg ntawm ib puag ncig muaj pes tsawg leeg.
4. Kev Ua Kom Muaj Pob Zeb: Thaum lub sijhawm no, cov pob zeb pib nkag mus rau hauv cov qhov me me thiab cov channel me me hauv cov organic matter. Cov txheej txheem no hu ua "permineralization," qhov twg cov pob zeb yaj hauv cov dej hauv av los ua ke thiab puv cov qhov chaw khoob hauv cov ntaub so ntswg organic.
5. Kev Hloov Cov Khoom Siv Organic: Hauv theem tom ntej, cov zaub mov pib hloov cov khoom siv organic qub los ntawm cov molecule. Qhov no txhais tau tias txawm hais tias cov qauv qub ntawm cov khoom siv organic tseem zoo li qub, cov tshuaj lom neeg hloov pauv tag nrho los ntawm organic mus rau inorganic.
6. Kev Ua Crystallization: Qee zaum, cov minerals uas hloov cov organic matter tuaj yeem ua crystallize, ua kom cov qauv ntawm cov pob zeb fossil muaj zog. Theem no ua kom cov pob zeb fossil muaj zog thiab tiv taus kev yaig lossis kev nyuaj siab ntxiv.
Cov xwm txheej uas txhawb nqa xob laim
Kev ua pob zeb los ntawm kev ua pob zeb tsis tshwm sim rau txhua qhov xwm txheej. Muaj ntau yam uas txiav txim siab seb cov khoom siv organic puas tuaj yeem ua pob zeb tau zoo:
1. Muaj Dej Ntxhia: Cov dej hauv av uas muaj ntau yam minerals yog qhov tseem ceeb rau cov txheej txheem xob laim. Cov minerals uas feem ntau cuam tshuam nrog xob laim suav nrog quartz, calcite, thiab silica, uas txhua yam yuav tsum tau yaj rau hauv cov dej hauv av.
2. Cov Xwm Txheej Tsis Muaj Pa: Qhov muaj pa me me los yog tsis muaj pa yuav ua rau cov khoom lwj qeeb thiab pab khaws cov organic kom txog thaum cov minerals tuaj yeem tshwm sim.
3. Ib puag ncig faus neeg: Ib puag ncig xws li thaj chaw roob hluav taws, thaj av dej nyab, lossis cov txaj pas dej feem ntau muab cov xwm txheej zoo tshaj plaws rau kev faus cov khoom siv organic sai thiab tiv thaiv kev oxidation.
4. Lub Sijhawm Ntev: Cov txheej txheem ntawm xob laim siv sijhawm ntev heev los ua kom tiav; feem ntau yog kaum tawm txhiab txog lab xyoo. Thaum lub sijhawm no, cov zaub mov tseem muaj nyob tas li thiab nkag mus rau hauv cov khoom siv organic.
Piv txwv ntawm Cov Teeb Meem Xob laim hauv Keeb Kwm Geological
1. Petri Hav Zoov, Arizona, Tebchaws Meskas:
Hav Zoov Petri hauv Arizona yog ib qho piv txwv ntawm cov ntoo petri nto moo tshaj plaws hauv ntiaj teb. Ntawm no, cov ceg ntoo uas muaj hnub nyoog los ntawm lub sijhawm Triassic, kwv yees li 225 lab xyoo dhau los, tau raug xob laim tua rau hauv pob zeb. Cov ntoo thaum ub no tau raug npog nrog cov tshauv volcanic, uas muaj ntau cov minerals silica, ua kom cov txheej txheem xob laim sai dua.
2. Petri Forest Chemnitz, Lub Tebchaws Yelemees:
Chemnitz, lub teb chaws Yelemes, yog lwm qhov chaw uas muaj xob laim loj heev. Cov ntoo uas nyob li ntawm 291 lab xyoo dhau los thaum lub sijhawm Permian tau muaj xob laim tom qab raug npog los ntawm cov tshauv hluav taws uas muaj silica ntau.
3. Pob Zeb Pob Txha Dinosaur, Utah, Tebchaws Meskas:
Muaj ntau cov pob txha dinosaur uas pom nyob rau ntawm Boneyard Flats, Utah, tau raug ua kom pob txha lwj. Cov pob txha no, tshwj xeeb tshaj yog los ntawm lub sijhawm Jurassic, qhia txog tib txoj kev uas cov zaub mov xws li calcite thiab quartz hloov cov pob txha qub.
Kev cuam tshuam ntawm kev tshawb fawb ntawm xob laim
Cov txheej txheem ntawm kev ua pob zeb muaj feem cuam tshuam loj heev rau geology, paleontology, thiab biology. Cov pob zeb fossils tsim los ntawm cov txheej txheem no muab cov kev nkag siab tseem ceeb rau cov qauv ntawm lub neej yav dhau los, cov xwm txheej ib puag ncig thaum lub sijhawm ntawd, thiab cov txheej txheem kev hloov pauv.
Kev Kawm Txog Av thiab Keeb Kwm Ntiaj Teb: Cov pob zeb uas tau raug xob laim tsim pab cov kws tshawb fawb rov tsim dua cov xwm txheej geological qub thiab cov txheej txheem uas tau tshwm sim hauv ntiaj teb rau kaum lab xyoo.
Kev Tshawb Fawb Txog Paleontology thiab Kev Hloov Pauv: Kev khaws cia pab cov kws tshawb fawb txog paleontology kawm txog lub cev, tus cwj pwm, thiab kev hloov pauv ntawm cov tsiaj txhu yav dhau los. Cov qauv ntawm cov pob txha fossils tau khaws cia zoo, ua rau muaj kev tshawb fawb kom raug thiab ntxaws ntxiv.
Kev Kawm Txog Lub Neej thiab Kev Hloov Pauv Huab Cua: Kev tshuaj xyuas cov khoom siv organic uas tau ua pob zeb tuaj yeem muab cov lus qhia txog kev hloov pauv huab cua yav dhau los thiab cov xwm txheej ecological. Piv txwv li, kev kawm txog cov ntoo fossilized tuaj yeem qhia cov ntaub ntawv hais txog cov hav zoov prehistoric thiab huab cua uas txhawb nqa lawv.
Xaus
Kev tsim xob laim yog ib qho ntawm tej yam zoo kawg nkaus ntawm xwm, hloov cov khoom siv organic mus ua cov pob zeb uas nyob mus ib txhis, ua rau peb pom tseeb txog keeb kwm ntawm lub neej hauv ntiaj teb. Cov txheej txheem no xav tau kev sib xyaw ua ke ntawm cov xwm txheej ib puag ncig thiab lub sijhawm ntev heev. Cov txiaj ntsig ntawm kev tsim xob laim tsis yog tsuas yog zoo nkauj xwb tab sis kuj muaj ntau cov ntaub ntawv uas ua rau peb nkag siab txog peb lub ntiaj teb yav dhau los. Los ntawm kev kawm txog petri wood thiab lwm yam pob zeb, peb tuaj yeem nkag siab zoo dua thiab nkag siab txog kev hloov pauv geological thiab lub neej uas muaj ua ntej peb.
