![TheHadean(IPA:/heɪˈdiːən,ˈheɪdiən/hay-DEE-
ən,HAY-dee-ən)[discuss] isthefirstandoldestofthe
fourknowngeologiceonsofEarth'shistory.It
startedwiththeplanet'sformationabout
4.54Bya,[2][3] nowdefinedas(4567.30±
0.16)Mya[1] setbytheageoftheoldestsolid
materialintheSolarSystemfoundin
somemeteoritesabout4.567billionyears
old.[4] Theproposedinterplanetarycollisionthat
createdtheMoonoccurredearlyinthiseon,and
theLateHeavyBombardmentishypothesizedto
haveoccurredattheendoftheeon.TheHadean
ended4billionyearsago,asdefinedby
theInternationalCommissionon
Stratigraphy(ICS),[5] andwassucceededby
theArcheaneon.
Hadeanrocksareveryrare,largelyconsisting
ofgranularzirconsfromonelocality(JackHills)
inWestern
Australia.[6] Hadeangeophysicalmodelsremain
controversialamonggeologists:itappears
thatplatetectonicsandthegrowth
ofcontinentsmayhavestartedinthe
Hadean.[6] EarthintheearlyHadeanhadavery
thickcarbondioxide-andmethane-rich
atmosphere,buteventuallyoceansmadeof
liquidwaterformed.](https://image.slidesharecdn.com/thehadeanipa-230815081355-5c580a44/85/The-Hadean-IPA-pptx-1-320.jpg)
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The Hadean (IPA.pptx
- 1. TheHadean(IPA:/heɪˈdiːən,ˈheɪdiən/hay-DEE- ən,HAY-dee-ən)[discuss] isthefirstandoldestofthe fourknowngeologiceonsofEarth'shistory.It startedwiththeplanet'sformationabout 4.54Bya,[2][3] nowdefinedas(4567.30± 0.16)Mya[1] setbytheageoftheoldestsolid materialintheSolarSystemfoundin somemeteoritesabout4.567billionyears old.[4] Theproposedinterplanetarycollisionthat createdtheMoonoccurredearlyinthiseon,and theLateHeavyBombardmentishypothesizedto haveoccurredattheendoftheeon.TheHadean ended4billionyearsago,asdefinedby theInternationalCommissionon Stratigraphy(ICS),[5] andwassucceededby theArcheaneon. Hadeanrocksareveryrare,largelyconsisting ofgranularzirconsfromonelocality(JackHills) inWestern Australia.[6] Hadeangeophysicalmodelsremain controversialamonggeologists:itappears thatplatetectonicsandthegrowth ofcontinentsmayhavestartedinthe Hadean.[6] EarthintheearlyHadeanhadavery thickcarbondioxide-andmethane-rich atmosphere,buteventuallyoceansmadeof liquidwaterformed.