{{위키데이터 속성 추적}}
{{다른 뜻|창조연대|과학적인 지구의 나이|창조론자들이 주장하는 지구의 나이}}
[[파일:The Earth seen from Apollo 17.jpg|섬네일|오른쪽|250px|[[아폴로 17호]]로 본 [[지구]]]]
'''지구의 나이''' 또는 '''지구 연령'''(地球年齡)은 45.4 ± 0.5 억 년{{nowrap|(4.54 × 10<sup>9</sup>년 ± 1%)}}이다.<ref name="USGS1997">{{웹 인용| date=1997 | title=Age of the Earth | url=http://pubs.usgs.gov/gip/geotime/age.html | publisher=U.S. Geological Survey | accessdate=2006-01-10| archiveurl= https://web.archive.org/web/20051223072700/http://pubs.usgs.gov/gip/geotime/age.html| archivedate= 23 December 2005 <!--DASHBot-->| url-status= live}}</ref><ref name="Dalrymple 2001 205–221">{{저널 인용| last=Dalrymple | first=G. Brent | authorlink=Brent Dalrymple | title=The age of the Earth in the twentieth century: a problem (mostly) solved | journal=Special Publications, Geological Society of London | date=2001 | volume=190 | issue=1 | pages=205–221 | doi=10.1144/GSL.SP.2001.190.01.14 |bibcode = 2001GSLSP.190..205D }}</ref><ref>{{저널 인용| author= Manhesa, Gérard| author2= Allègre, Claude J.| author3= Dupréa, Bernard| author4= Hamelin, Bruno| last-author-amp= yes | title=Lead isotope study of basic-ultrabasic layered complexes: Speculations about the age of the earth and primitive mantle characteristics | authorlink2=Claude Allègre | journal=[[Earth and Planetary Science Letters]] | date=1980 | volume=47 | issue= 3 | pages=370–382 | doi=10.1016/0012-821X(80)90024-2 | bibcode=1980E&PSL..47..370M}}</ref><ref>{{웹 인용|last=Braterman |first=Paul S. |publisher=Scientific American |year=2013 |title=How Science Figured Out the Age of Earth |url=http://www.scientificamerican.com/article/how-science-figured-out-the-age-of-the-earth/ |url-status=live |archiveurl=https://web.archive.org/web/20160412054317/http://www.scientificamerican.com/article/how-science-figured-out-the-age-of-the-earth/ |archivedate=2016-04-12 |df= }}</ref> 이 나이는 지구 핵의 형성 과정 중 [[강착]]의 나이 및 지구가 형성될 때 물질의 나이이다.<ref name="Dalrymple 2001 205–221"/> 지구의 나이는 [[운석]]의 [[방사능 연대 측정]] 자료를 기반으로 하며<ref>{{서적 인용|last=Hedman |first=Matthew |title=The Age of Everything |chapter=9: Meteorites and the Age of the Solar System |pages=142–162 |publisher=University of Chicago Press |year=2007 |chapter-url=https://books.google.com/books?id=ciMyFqO--VMC&printsec=frontcover&dq=The+age+of+everything&hl=en&sa=X&ved=0ahUKEwiSz5OSpJLNAhVm2oMKHVKVAyQQ6AEIHTAA#v=onepage&q=The%20age%20of%20everything&f=false |url-status=live |archiveurl=https://web.archive.org/web/20180214145555/https://books.google.com/books?id=ciMyFqO--VMC&printsec=frontcover&dq=The+age+of+everything&hl=en&sa=X&ved=0ahUKEwiSz5OSpJLNAhVm2oMKHVKVAyQQ6AEIHTAA#v=onepage&q=The%20age%20of%20everything&f=false |archivedate=2018-02-14 |df= }}</ref> 가장 오래 알려진 지구 및 [[달]] [[월석|월석 시료]]의 [[방사능 연대 측정|방사성 연대]]와 거의 비슷하다.

== 역사 ==
20세기 초 방사성 연대 측정이 발전함에 따라 [[우라늄-납 연대 측정]]을 이용한 우라늄 광물 연대 측정 결과 일부 암석은 나이가 10억년이 넘는다는 것이 밝혀졌다.<ref name="Boltwood">{{저널 인용|title=On the ultimate disintegration products of the radio-active elements. Part II. The disintegration products of uranium|journal=American Journal of Science|last=Boltwood|first=B. B.|authorlink=Bertram Boltwood|date=1907|volume=23|issue=134|pages=77–88|doi=10.2475/ajs.s4-23.134.78}}<br />For the abstract, see: {{서적 인용|url=https://books.google.com/?id=1su2AAAAIAAJ&pg=PA817|title=Chemical Abstracts|author1=Chemical Abstracts Service, American Chemical Society|date=1907|publisher=American Chemical Society|location=New York, London|pages=817|accessdate=2008-12-19}}</ref> 심지어 호주 [[웨스턴오스트레일리아주]]의 [[잭 힐즈]]에서 채취한 [[지르콘]]과 같은 가장 오래된 암석의 나이는 최대 44억 4백만년이라는 것이 드러났다.<ref name="nature409">{{저널 인용|title=Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago|journal=Nature|author=Wilde, S. A.|author2=Valley, J. W.|date=2001-01-11|volume=409|issue=6817|pages=175–178|doi=10.1038/35051550|pmid=11196637|author3=Peck, W. H.|author4=Graham C. M.}}</ref><ref>{{웹 인용|url=http://www.geology.wisc.edu/outcrop/99/99_pdfs/iso_topics.pdf|title=Zircons Are Forever|author=Valley, John W.|author2=Peck, William H.|date=1999|work=The Outcrop, Geology Alumni Newsletter|publisher=University of Wisconsin-Madison|pages=34–35|archiveurl=https://web.archive.org/web/20090226123751/http://www.geology.wisc.edu/outcrop/99/99_pdfs/iso_topics.pdf|archivedate=2009-02-26|url-status=live|accessdate=2008-12-22|author3=Kin, Elizabeth M.|df=}}</ref><ref>{{저널 인용|title=4350–3130 Ma detrital zircons in the Southern Cross Granite–Greenstone Terrane, Western Australia: implications for the early evolution of the Yilgarn Craton|journal=Australian Journal of Earth Sciences|author=Wyche, S.|author2=Nelson, D. R.|date=2004|volume=51|issue=1|pages=31–45|bibcode=2004AuJES..51...31W|doi=10.1046/j.1400-0952.2003.01042.x|author3=Riganti, A.}}</ref> [[태양계]] 내에서 알려진 가장 오래된 고체 구성물인 [[칼슘-알루미늄 다수 내포물]]의 연대 측정 결과 45억 6700만년이라는 결과가 나오며<ref>{{저널 인용|title=Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions|journal=Science|author=Amelin, Y|author2=Krot, An|date=Sep 2002|volume=297|issue=5587|pages=1678–83|bibcode=2002Sci...297.1678A|doi=10.1126/science.1073950|issn=0036-8075|pmid=12215641|author3=Hutcheon, Id|author4=Ulyanov, Aa}}</ref><ref name="nature436">{{저널 인용|title=Early planetesimal melting from an age of 4.5662 Gyr for differentiated meteorites|journal=Nature|author=Baker, J.|author2=Bizzarro, M.|date=2005-08-25|volume=436|issue=7054|pages=1127–1131|bibcode=2005Natur.436.1127B|doi=10.1038/nature03882|pmid=16121173|display-authors=4|author3=Wittig, N.|author4=Connelly, J.|author5=Haack, H.}}</ref> [[태양계의 형성과 진화|태양계 나이의 최소 하한]]이 결정되었다.

지구는 칼슘-알루미늄 다수 내포물과 그 운석이 생겨난 직후 강착되었다고 추정하고 있다. 하지만 강착 과정에 걸린 시간은 서로 다른 강착 과정 모델에 따라서 최소 수백만 년에서 최대 1억년까지 서로 다른 기간으로 말하기 때문에 지구의 나이와 지구에서 가장 오래된 암석의 나이의 차이가 어느 정도인지는 정확히 알 수 없다. 또한 암석 자체도 서로 다른 나이의 미네랄이 모인 집합체이기 때문에 가장 오래된 암석의 정확한 나이를 아는 것은 어렵다.

== 같이 보기 ==
* [[우주의 나이]]
* [[지구의 역사]]
* [[박물학]]

== 각주 ==
{{각주}}

== 참고 자료 ==
* {{서적 인용
  | first = G. Brent
  | last = Dalrymple
  | date = 1994-02-01
  | title = The Age of the Earth
  | publisher = Stanford University Press
  | isbn = 0-8047-2331-1 }}
* Baadsgaard, H.; Lerbekmo, J.F.; Wijbrans, J.R., 1993. Multimethod radiometric age for a bentonite near the top of the Baculites reesidei Zone of southwestern Saskatchewan (Campanian-Maastrichtian stage boundary?). ''Canadian Journal of Earth Sciences'', v.30, p.&nbsp;769–775.
* Baadsgaard, H. and Lerbekmo, J.F., 1988. A radiometric age for the Cretaceous-Tertiary boundary based on K-Ar, Rb-Sr, and U-Pb ages of bentonites from Alberta, Saskatchewan, and Montana. ''Canadian Journal of Earth Sciences'', v.25, p.&nbsp;1088–1097.
* Eberth, D.A. and Braman, D., 1990. Stratigraphy, sedimentology, and vertebrate paleontology of the Judith River Formation (Campanian) near Muddy Lake, west-central Saskatchewan. ''Bulletin of Canadian Petroleum Geology'', v.38, no.4, p.&nbsp;387–406.
* Goodwin, M.B. and Deino, A.L., 1989. The first radiometric ages from the Judith River Formation (Upper Cretaceous), Hill County, Montana. ''Canadian Journal of Earth Sciences'', v.26, p.&nbsp;1384–1391.
* Gradstein, F. M.; Agterberg, F.P.; Ogg, J.G.; Hardenbol, J.; van Veen, P.; Thierry, J. and Zehui Huang., 1995. A Triassic, Jurassic and Cretaceous time scale. IN: Bergren, W. A. ; Kent, D.V.; Aubry, M-P. and Hardenbol, J. (eds.), ''Geochronology, Time Scales, and Global Stratigraphic Correlation''. Society of Economic Paleontologists and Mineralogists, Special Publication No. 54, p.&nbsp;95–126.
* Harland, W.B., Cox, A.V.; Llewellyn, P.G.; Pickton, C.A.G.; Smith, A.G.; and Walters, R., 1982. ''A Geologic Time Scale'': 1982 edition. Cambridge University Press: Cambridge, 131p.
* Harland, W.B.; Richard Lee Armstrong; Cox, A.V.; Craig, L.E.; Smith, A.G.; Smith, D.G., 1990. ''A Geologic Time Scale'', 1989 edition. Cambridge University Press: Cambridge, p.&nbsp;1–263. {{ISBN|0-521-38765-5}}
* Harper, C.W., Jr., 1980. ''Relative age inference in paleontology''. Lethaia, v. 13, p.&nbsp;239–248.
* Obradovich, J.D., 1993. A Cretaceous time scale. IN: Caldwell, W.G.E. and Kauffman, E.G. (eds.). ''Evolution of the Western Interior Basin''. Geological Association of Canada, Special Paper 39, p.&nbsp;379–396.
* Palmer, Allison R. (compiler), 1983. The Decade of North American Geology 1983 Geologic Time Scale.'' Geology'', v. 11, p.&nbsp;503–504. September 12, 2004.
* Powell, James Lawrence, 2001, ''Mysteries of Terra Firma: the Age and Evolution of the Earth'', Simon & Schuster, {{ISBN|0-684-87282-X}}

== 외부 링크 ==
* {{언어링크|en}} [http://www.talkorigins.org/faqs/faq-age-of-earth.html TalkOrigins.org]
* [http://www.vectorsite.net/ Vectorsite.net]&nbsp;– ''Initial version of this article was based on a public domain text by [[Greg Goebel]]''
* [http://pubs.usgs.gov/gip/geotime/age.html USGS preface on the Age of the Earth]
* [http://www2.jpl.nasa.gov/snc/nasa1.html NASA exposition on the age of Martian meteorites]

{{지구}}

{{전거 통제}}

[[분류:지질연대학]]
[[분류:지구과학사]]
[[분류:지질학 이론]]