Iplanethi yasemzini yangqubana noMhlaba kwiminyaka engama-4.5 yezigidi eyadlulayo.Ithala Leencwadi Loluntu laseNew York Iplanethi elingana noMars eyabetha uMhlaba iminyaka engama-4,5 yeebhiliyoni eyadlulayo yaza yazala inyanga inokuba ishiye iziqwenga zayo ezibini zinzulu kwingubo yomhlaba isifundo esitsha icebisa.
Izazinzulu kudala zavumelana ngobukho beplanethi, ebizwa ngokuba yiTheia, kunye nendima yayo ekudaleni inyanga. Ithiyori ithi u-Theia wagqobhoza eMhlabeni kwangoko ebomini kwaye wakhupha ilitye eliya kuthi kamva libe yinyanga. Uphononongo olutsha olukhokelwa nguQian Yuan, umphandi we-geodynamics e-Arizona State University (ASU), iTempe, ucebisa ukuba iintsalela zeThiya zisephakathi emhlabeni, mhlawumbi zibekwe kumanqanaba amabini elizwekazi phantsi kweNtshona ye-Afrika kunye noLwandlekazi lwePasifiki.
Seismologists bebefunda la matye mabini amashumi eminyaka. Bafumanise ukuba amaza enyikima anyikima ngokukhawuleza xa edlula kulwahlulo, nto leyo ebonisa ukuba zixinene kwaye zinemichiza eyahlukileyo kwilitye lengubo elijikelezileyo. Iseismologists zibabiza ngokuba ngamaphondo wesantya esisezantsi esikhulu, okanye ii-LLSVPs. Ngokudibeneyo, ziqulathe malunga nokuphindaphindwa kathandathu ubunzima benyanga.
Zezona zinto zinkulu kwisambatho somhlaba, utshilo uYuan xa ebonisa umsebenzi wakhe Kwiveki ephelileyo kwiNkomfa ye-Lunar kunye nePlanethi yeSayensi ye-2021.
Ngokusekwe kubungqina be-isotopic kunye nemodeli, u-Yuan ukholelwa ukuba ii-LLSVPs ziyinyani ye-Theia uqobo. Ungatsho ukuba ezi zezona zikhulu zeemeteorite ezinkulu nezona zinkulu ukuba ubukhulu becala ingubo kaThiya. Kupholile kakhulu, uxelele Usekela .
Kungekudala emva kokungqubana kweminyaka eyi-4.5 yezigidigidi eyadlulayo, undoqo kaThiya udityaniswe noMhlaba, umsebenzi ka Yuan ucebisa. Imodeli yakhe emva koko ijolise ekuchongeni iimeko ezaziza kuthi iingubo zikaThiya zitshone phantsi apho ii-LLSVP zimbini namhlanje kunokuba zixubene nengubo yoMhlaba. Ukulinganisa kubonise ukuba ingubo kaThiya ifuna ukuba yi-1.5 yeepesenti ukuya kwi-3.5 yepesenti engaphezulu kunaleyo yoMhlaba ukuze isinde ekuxubeni kwaye iphele njengezigaqa ezahlukileyo kufutshane nomhlaba.
Isiphumo siyamangalisa ngokumangalisayo kunye nokufunyaniswa kwesifundo se-2019 kwindima kaThiya ekudaleni inyanga ekhokelwa ngumntu osebenza naye waseYuan, u-ASU Tempe astrophysicist uSteven Desch.
Ubudala be-LLSVPs ekuthethwa ngabo buyahambelana nethiyori yokungqubana. Kule minyaka ilishumi idlulileyo, iingcali zejogoloje zifumanise ukuba i-lavas e-Iceland nase Samoa inerekhodi ye-isotopic yezinto ezinemitha eqhumayo ezenziwa kwiminyaka ye-100 yezigidi zokuqala zembali yoMhlaba, ixesha apho inyanga yenziwa khona, Imagazini yeSayensi . (Umhlaba uneminyaka engama-4.54 yezigidigidi ubudala.)
Ubungqina obuninzi buza kuza xa izazinzulu zifumana amatye angatshintshiyo kwingubo yenyanga. La matye kukholelwa ukuba abakho kwimpembelelo enkulu yomngxuma kwinyanga esemazantsi, apho iNASA kunye ne China ziceba ukuphonononga eli shumi leminyaka.
