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Zircons waa macdanta ay jecel yihiin saynisyahannada sababtoo ah way adag yihiin. Cabbirka mikrometer-kan crystals waxay u adkeysan karaan cimilada balaayiin sano si ay u ilaashadaan sirta juqraafiyeed ee dhalashadooda. Waxay sidoo kale qabtaan isotopes uranium-ka deegaanka marka ay sameysmaan, taas oo u adeegta sidii waqti-qaade ka bilaabma wakhtiga zircons-ka crystallize. Ebony Sex Doll

Uranium isotopes waxay u qudhuntaa sunta rasaasta iyadoo la saadalin karo. Marka la tiriyo tirada atomyada rasaasta ee samaysma iyo atamka uranium-ka ee hadhay, cilmi-baarayaashu waxay ogaan karaan inta wakhti ee ka soo wareegtay tan iyo markii ay zircons-ku ka qallafsan yihiin walxo dhalaalay.

Qorayaasha daraasadda ayaa baadhay zircons-ka ku dhex jira muunad dhagax dayaxeed oo la ururiyay intii lagu jiray Apollo 17 ee 1972, waxayna dhiseen khariidad 3D ah oo atamka ah. Tirinta isotopes-ka macdanta "lead" waxay keentay da'da 4.46 bilyan sano, da'da ugu da'da weyn samaynta qolof dayaxa weli.

Da'dan waxaa hore u go'aamiyay la-shaqeeyayaashii Greer oo ay hogaaminayeen Bidong Zhang iyo Audrey Bouvier 2021, laakiin warbixintu waxay keentay shaki. Dhaleeceyntu waxay tilmaameen in atamka macdanta "lead" ay u guuraan si ay u sameeyaan jeebab badan ama kuwo hoose oo dhagaxa oo dhan ah. Iyadoo ku xiran hadba meesha la eego, waxaa jirtay fursad ah inay la kulmaan goobahan sunta rasaasta ah ee aan sinnayn oo ay si khaldan u xisaabiyaan da'da zircon.

Si loo qanciyo walaacyadaas, Bouvier wuxuu la xiriiray kooxda Greer si ay u tiriyaan atamka mar kale, markan iyada oo la adeegsanayo baaritaanka ion kaas oo muunad ka qaadi kara dhagaxa xalal aad u sarreeya oo loo adeegsaday daraasaddii hore. Baadhitaan aad u fiican ayaa u oggolaan doonta kooxda inay aqoonsadaan gobollada nanosized ee atamka macdanta rasaasta ah ee dhammaatay, haddii ay jiraan. Laakiin ma aysan helin.Melina Elden Ring Sex Doll

"Zircon-kan, wax walbaa waxay ahaayeen kuwo isku mid ah, sidaas darteed xitaa kama aynaan walwalin taas," ayuu yiri qoraaga daraasadda Philipp Heck, oo ku takhasusay cosmochemist Museum Field iyo Jaamacadda Chicago. Natiijadu waxay xaqiijisay in da'dii hore loo qiyaasay ee 4.46 bilyan sano ay ahayd mid sax ah.

"Waa daraasad aad iyo aad u wanaagsan," ayay tiri Melanie Barboni, geochemist oo ka tirsan Jaamacadda Gobolka Arizona oo aan ku lug lahayn cilmi-baarista. Barboni waxa uu daraasad ku sameeyay isotopes-yada kale ee zircons-ka dayaxa si uu u ogaado in dayaxa gudahiisa uu markii ugu horaysay degay lakabyo kala duwan 4.51 bilyan oo sano ka hor, dhacdadaas oo ka horaysay heerarkii ugu dambeeyay ee samaynta qolof ah oo lagu qabtay daraasaddan cusub.

Barboni waxay sheegtay in cilmi-baarista cusub ay la jaan qaadayso natiijooyinkeeda. "Waraaqo badan ayaa soo jeedinaya in dayaxu uu sameeyay wax badan ka dib, 4.3 bilyan sano, tusaale ahaan," ayay raacisay. "Taasi si cad uguma suurtoobayso xogtaas."