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8/9/2019 Tema 16 Timpul Geologic
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E3OLUTIA PALEOGEOGA4ICA
A TEEI
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http://www.ruf.rice.edu/~leeman/aNR.htmhttp://www.ruf.rice.edu/~leeman/aNR.htm8/9/2019 Tema 16 Timpul Geologic
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E3OLUTIA 3IETII PE TEA
http://www.ruf.rice.edu/~leeman/aNR.htmlhttp://www.ruf.rice.edu/~leeman/aNR.html8/9/2019 Tema 16 Timpul Geologic
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+& GEOCONOLOGIE
Geocronologia este o ramura a stratigrafie care seocupa cu datarea (stabilirea vrstei) depozitelorgeologice si ierarhizarea cronologica a acestora,
rezultnd unitai geocronologice (de timp), concretizate nunitai cronostratigrafice.
Datarea se poate face relativ, aplicndu-se corelarile pornind de la principiul superpoziei
geometrice a stratelor si evoluiei organismelor biologice
n mod absolut, folosindu-se metode radiometrice.
Unitati geocronologice !"#, !$%, &!$'"%%, !&"%,*%$+%, $"#
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DATAEA PIN METODE
ADIOMETICE
36rste absolute
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Eon Era Perioa%ainceput - s/arsit7mil&ani8
P"anerooic Eon# PH
Cenooic Era#
C.
Neogen N )9&* -
Paleogen E 2:&: - )9&*
Mesooic Era#M.
Cretacic ; + - ):+Carboni/er C 9:> - )>>
De!onian D
?ilurian ?
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Istoria
geologicaa Pamantului
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I EONUL PECAMBIAN
II& EONUL 4ANEO.OIC
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EON EA ?PAN 7Ma8 Notes an% E!ents
&roterozoic
Paleoproterozoic
2500 - 2300
myaore or less conventional plate tectonics
Arc"ean
Neoarc"ean2800 - 2500mya
irst large continental shields
Mesoarc"ean
3200 - 2800mya
irst /idel0-accepted fossil evidence of life. irst banded iron formations.
Paleoarc"ean
3600 - 3200
mya
irst stromatolites1 ormation of relativel0 stable crust units (possibl0 even earlier ,but seegenerall0 negative revie/ .
Eoarc"ean~3800 - 3600mya
ebatable geochemical evidence for life (no longer /idel0 accepted)
2adean Early Imbrian3850 - 3800
myaLate heavy bombardment of Earth-moon system.
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+& AHAIC 7T"e Arc"ean Eon #"ttp#$$palaeos&com$ "ttp#$$palaeos&com$arc"ean$in%e&"tml 8
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)& POTEO.OIC- CAACTEI.AE "ttp#$$
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3 4eografia &roterozoicului
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6 *iata in &roterozoic
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eon era perioada% inceput acum(mil ani)
urata (mil ani)
anerozoic
7 #eozoic(enozoic)
#eogen 67.8 67.8
&aleogen 9:.: ;6.:
6 ezozoic
retacic 3;9 > ; 98
evonian ;39 :?
+ilurian ;;; 6