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Zircon yog cov ntxhia nyiam ntawm cov kws tshawb fawb vim tias lawv muaj zog. Cov micrometer-loj crystals tuaj yeem tiv taus huab cua ntau tshaj billions xyoo los khaws cov geochemical secrets ntawm lawv yug. Lawv kuj ntes uranium isotopes los ntawm ib puag ncig thaum lawv tsim, uas ua haujlwm raws li lub sijhawm uas pib txij lub sijhawm zircons crystallize.Ebony Sex Doll

Uranium isotopes lwj mus rau hauv cov hlau lead ntawm tus nqi kwv yees. Los ntawm suav cov naj npawb ntawm cov hlau lead atoms uas tsim thiab cov uranium atoms uas tseem tshuav, cov kws tshawb fawb tuaj yeem ua haujlwm ntau npaum li cas tau dhau mus txij li lub zircons hardened los ntawm cov khoom molten.Lesbian Sex Doll

Cov kws sau ntawv tshawb fawb tau soj ntsuam cov zircons embedded nyob rau hauv lub lunar pob zeb qauv sau thaum lub sij hawm Apollo 17 nyob rau hauv 1972, thiab lawv tsim ib daim ntawv qhia 3D ntawm lub atoms. Tallying cov hlau lead isotopes ua rau muaj hnub nyoog ntawm 4.46 billion xyoo, lub hnub nyoog laus tshaj plaws rau lub lunar crust tsim tsis tau.

Lub hnub nyoog no tau txiav txim siab yav dhau los los ntawm Greer cov neeg koom tes coj los ntawm Bidong Zhang thiab Audrey Bouvier hauv 2021, tab sis tsab ntawv ceeb toom ua rau muaj kev tsis ntseeg. Cov neeg thuam tau taw qhia qhov tseeb tias cov hlau lead atom zoo li tsiv mus rau hauv cov hnab ris ntawm qhov siab lossis qis qis thoob plaws hauv pob zeb. Nyob ntawm seb qhov twg ib tug saib, muaj lub caij nyoog uas lawv yuav tuaj hla cov chaw uas tsis sib xws no thiab suav zircon lub hnub nyoog miscalculate.

Txhawm rau pab txhawb cov kev txhawj xeeb no, Bouvier tau mus cuag Greer pab pawg los suav cov atoms dua, lub sijhawm no nrog kev sojntsuam ion uas tuaj yeem coj cov pob zeb ntawm qhov kev daws teeb meem ntau dua uas tau siv hauv txoj kev tshawb fawb dhau los. Ib qho kev sojntsuam zoo dua yuav tso cai rau pab pawg txheeb xyuas thaj tsam nanosized ntawm cov hlau lead atoms, yog tias muaj. Tab sis lawv nrhiav tsis tau.Melina Elden Ring Sex Doll

"Hauv lub zircon no, txhua yam yog homogeneous, yog li peb tsis tas yuav txhawj xeeb txog qhov ntawd," hais tias tus kws tshawb fawb Philipp Heck, tus kws tshaj lij cosmochemist ntawm Field Museum thiab University of Chicago. Cov txiaj ntsig tau lees paub tias yav dhau los ntsuas hnub nyoog ntawm 4.46 billion xyoo yog qhov tseeb.

"Nws yog ib qho kev kawm zoo heev,"hais tias Melanie Barboni, geochemist ntawm Arizona State University uas tsis koom nrog hauv kev tshawb fawb. Barboni tau kawm lwm cov isotopes hauv lunar zircons kom pom tias lub hli sab hauv thawj zaug nyob rau hauv cov khaubncaws sab nraud povtseg 4.51 billion xyoo dhau los, ib ntu uas ua ntej cov theem kawg ntawm kev tsim cov crust uas tau ntes hauv txoj kev tshawb fawb tshiab.

Barboni hais tias qhov kev tshawb fawb tshiab tau sib haum nrog nws qhov kev tshawb pom. Nws hais ntxiv tias "Ntau daim ntawv qhia tias lub hli tsim tom qab ntau dua li ntawd, 4.3 billion xyoo, piv txwv li," nws hais ntxiv. "Qhov ntawd meej yog tsis muaj peev xwm nrog cov ntaub ntawv ntawd."